Audio output device

Abstract

An acoustic output device according to an embodiment of the present application includes a bone conduction acoustic assembly that generates bone conduction sound waves, an air conduction acoustic assembly that generates air conduction sound waves, and a housing that accommodates at least some of the elements in the bone conduction acoustic assembly and the air conduction acoustic assembly, the housing includes a first cavity and a second cavity, the first cavity accommodates at least a portion of the bone conduction acoustic assembly, the housing has a sound emission hole that communicates with the second cavity, the air conduction sound waves are transmitted to the outside of the acoustic output device through the sound emission hole, and the frequency response curve of the air conduction sound waves has one or more resonant peaks, and the peak resonant frequency of the resonant peaks is 1 kHz or more.

Description

[Technical field]

[0001] This application relates to the field of audio output, and in particular to audio output devices.

[0002] [Incorporated by reference] This application claims priority to a Chinese application with Application No. 2021103834522, filed on April 9, 2021, the entire contents of which are incorporated herein by reference. [Background technology]

[0003] At present, wearable devices equipped with audio output devices are emerging and becoming more and more popular. In particular, open-ear type audio output devices (e.g., bone conduction speakers) are widely used to facilitate the conduction of sound to users due to their health and safety characteristics. However, bone conduction speakers have a certain amount of sound leakage in the mid-low frequency range. Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, it is desirable to provide an audio output device that can reduce sound leakage and improve the user's audio experience. [Means for solving the problem]

[0005] An acoustic output device according to an embodiment of the present application includes a bone conduction acoustic assembly that generates bone conduction sound waves, an air conduction acoustic assembly that generates air conduction sound waves, and a housing that accommodates at least some of the elements in the bone conduction acoustic assembly and the air conduction acoustic assembly, the housing includes a first cavity and a second cavity, the first cavity accommodates at least a portion of the bone conduction acoustic assembly, the housing has a sound emission hole that communicates with the second cavity, the air conduction sound waves are transmitted to the outside of the acoustic output device through the sound emission hole, and the frequency response curve of the air conduction sound waves has one or more resonant peaks, and the peak resonant frequency of the resonant peaks is 1 kHz or more. In some embodiments, the air conduction acoustic assembly includes at least one vibrating membrane connected to the bone conduction acoustic assembly or the housing, and the air conduction acoustic waves can be generated by vibration of the at least one vibrating membrane or the housing.

[0006] In some embodiments, the at least one diaphragm divides a cavity of the housing into the first cavity and the second cavity.

[0007] In some embodiments, the housing further comprises at least one vacuum hole in communication with the first cavity.

[0008] In some embodiments, the at least one pressure reduction hole includes a first pressure reduction hole and a second pressure reduction hole, the first pressure reduction hole is located farther from the sound emission hole than the second pressure reduction hole, and an effective area of ​​an outlet end of the first pressure reduction hole is greater than an effective area of ​​an outlet end of the second pressure reduction hole.

[0009] In some embodiments, the sound emission hole and the first decompression hole are located on opposite sides of the bone conduction acoustic assembly.

[0010] In some embodiments, the housing includes a first side wall and a second side wall located on opposite sides of the bone conduction acoustic assembly, and a third side wall and a fourth side wall connected to the first side wall and the second side wall and spaced apart from each other, and the sound emission hole and the first decompression hole are respectively located in the first side wall and the second side wall, and the second decompression hole is located in the third side wall or the fourth side wall.

[0011] In some embodiments, the at least one pressure reduction hole further includes a third pressure reduction hole, an effective area of ​​the outlet end of the second pressure reduction hole is greater than an effective area of ​​the outlet end of the third pressure reduction hole, and the second pressure reduction hole and the third pressure reduction hole are respectively disposed in the third side wall and the fourth side wall.

[0012] In some embodiments, the actual area of ​​the outlet end of the first pressure reduction hole is greater than the actual area of ​​the outlet end of the second pressure reduction hole, and the actual area of ​​the outlet end of the second pressure reduction hole is greater than the actual area of ​​the outlet end of the third pressure reduction hole.

[0013] In some embodiments, the housing further includes at least one tuning hole communicating with the second cavity, and a peak resonant frequency of the resonant peak when the at least one tuning hole is in an open state is shifted to a higher frequency than a peak resonant frequency of the resonant peak when the at least one tuning hole is in a closed state.

[0014] In some embodiments, the shift to higher frequencies is greater than or equal to 500 Hz.

[0015] In some embodiments, the shift to higher frequencies is greater than or equal to 1 kHz.

[0016] In some embodiments, the peak resonant frequency of the resonant peak when the at least one tuning hole is in an open state is 2 kHz or more.

[0017] In some embodiments, the sum of the effective areas of the outlet ends of all the sound articulation holes is 1.5 mm 2 That's all.

[0018] In some embodiments, the housing includes a first side wall and a second side wall located on opposite sides of the bone conduction acoustic assembly, the at least one articulation hole includes a first articulation hole, and the sound emission hole and the first articulation hole are respectively disposed in the first side wall and the second side wall.

[0019] In some embodiments, the housing further includes a third side wall and a fourth side wall connected to the first side wall and the second side wall and spaced apart from each other, and the at least one acoustic articulation hole further includes a second acoustic articulation hole disposed in the third side wall or the fourth side wall.

[0020] In some embodiments, an effective area of ​​the outlet end of the first articulation hole is greater than an effective area of ​​the outlet end of the second articulation hole.

[0021] In some embodiments, the actual area of ​​the outlet end of the first articulation hole is greater than the actual area of ​​the outlet end of the second articulation hole.

[0022] In some embodiments, the actual area of ​​the outlet end of the first tuning hole is 3.8 mm 2 and / or the actual area of ​​the outlet end of the second tuning hole is 2.8 mm 2 That's all.

[0023] In some embodiments, an acoustic impedance network is respectively provided at the outlet ends of the first and second acoustic tuning holes, and the void ratio of the acoustic impedance network is 16% or less.

[0024] In some embodiments, the housing is provided with at least one decompression hole communicating with the first cavity, at least some of the sound articulation holes are provided adjacent to at least some of the at least one decompression hole, and a spacing distance between adjacent sound articulation holes and decompression holes is 2 mm or less.

[0025] In some embodiments, the effective area of ​​the outlet end of the pressure reduction hole of the adjacently located pressure reduction hole and sound adjustment hole is greater than the effective area of ​​the outlet end of the sound adjustment hole of the adjacently located pressure reduction hole and sound adjustment hole.

[0026] In some embodiments, the actual area of ​​the outlet end of the decompression hole of the adjacently arranged decompression hole and acoustic adjustment hole is larger than the actual area of ​​the outlet end of the acoustic adjustment hole of the adjacently arranged decompression hole and acoustic adjustment hole, and / or the outlet ends of the adjacently arranged decompression hole and acoustic adjustment hole are respectively covered with a first acoustic impedance network and a second acoustic impedance network, and the porosity of the first acoustic impedance network is larger than the porosity of the second acoustic impedance network.

[0027] In some embodiments, the ratio of the effective area of ​​the outlet end of the pressure reduction hole among the adjacent pressure reduction holes and the adjacent sound adjustment holes to the effective area of ​​the outlet end of the pressure adjustment hole among the adjacent pressure reduction holes and the adjacent sound adjustment holes is 2 or less.

[0028] In some embodiments, a frequency response curve of the air-conducted sound output to the outside of the acoustic output device through the at least one pressure reduction hole has a first resonance peak, and a frequency response curve of the air-conducted sound output to the outside of the acoustic output device through the tuning hole has a second resonance peak, and the peak resonance frequency of the first resonance peak and the peak resonance frequency of the second resonance peak are each 2 kHz or more.

[0029] In some embodiments, a ratio of a difference between a peak resonant frequency of the first resonant peak and a peak resonant frequency of the second resonant peak to the peak resonant frequency of the first resonant peak is less than or equal to 60%.

[0030] In some embodiments, a peak resonant frequency of the first resonant peak and a peak resonant frequency of the second resonant peak are each greater than or equal to 3.5 kHz.

[0031] In some embodiments, the difference between a peak resonant frequency of the first resonant peak and a peak resonant frequency of the second resonant peak is less than or equal to 2 kHz.

[0032] In some embodiments, the device further includes a sound-guiding member connected to the housing, the sound-guiding member having a sound-guiding passage therein, the sound-guiding passage communicating with the sound output hole and guiding the air-conducted sound waves to the outside of the acoustic output device.

[0033] In some embodiments, the length of the sound conducting passage is between 2 mm and 5 mm.

[0034] In some embodiments, the cross-sectional area of ​​the sound conducting passage is 4.8 mm 2 That's all.

[0035] In some embodiments, the cross-sectional area of ​​the sound-conducting passage increases gradually along the direction of propagation of the air-conducted sound waves.

[0036] In some embodiments, the cross-sectional area of ​​the inlet end of the sound conducting passage is 10 mm 2 or more, or the cross-sectional area of ​​the outlet end of the sound-conducting passage is 15 mm 2 That's all.

[0037] In some embodiments, the ratio of the volume of the sound-conducting passage to the volume of the second cavity is between 0.05 and 0.9.

[0038] In some embodiments, the distance along the vibration direction of the bone conduction acoustic assembly between the outlet end of the sound conducting passage and an inner wall of the housing remote from the skin contact area is greater than or equal to 3 mm.

[0039] In some embodiments, an acoustic impedance network is disposed at the outlet end of the sound-conducting passage, and the void ratio of the acoustic impedance network is 13% or more.

[0040] In some embodiments, the housing is provided with a pressure reduction hole communicating with the first cavity, and the effective area of ​​the outlet end of the sound-conducting passage is greater than or equal to the sum of the effective areas of the outlet ends of all the pressure reduction holes in the housing that communicate with the first cavity.

[0041] In some embodiments, the ratio of the sum of the effective areas of the outlet ends of all the pressure reduction holes to the effective area of ​​the outlet end of the sound conducting passage is greater than or equal to 0.15.

[0042] In some embodiments, the porosity of an acoustic impedance network covering the outlet end of the sound-conducting passage is equal to or greater than the porosity of an acoustic impedance network covering the outlet end of at least a portion of the decompression holes.

[0043] In some embodiments, the housing is provided with a sound articulation hole communicating with the second cavity, and an effective area of ​​an outlet end of the sound conducting passage is greater than an effective area of ​​an outlet end of each of the sound articulation holes.

[0044] In some embodiments, the effective area of ​​the outlet end of the sound conducting passage is greater than the sum of the effective areas of the outlet ends of all the sound articulation holes.

[0045] In some embodiments, a ratio of the sum of the effective areas of the outlet ends of all the sound articulation holes to the effective area of ​​the outlet end of the sound conducting passage is 0.08 or more.

[0046] In some embodiments, the porosity of an acoustic impedance network covering the outlet end of the sound conducting passage is greater than the porosity of an acoustic impedance network covering the outlet end of the sound tuning hole.

[0047] In some embodiments, the bone conduction acoustic assembly includes a magnetic circuit system and a coil assembly, the magnetic circuit system forms a magnetic gap, the coil assembly is installed in the first cavity and inserted into the magnetic gap, and a communication hole is installed.

[0048] In some embodiments, the communication hole is located at a portion of the coil assembly located outside the magnetic gap.

[0049] In some embodiments, the coil assembly includes a coil and a coil holder, the coil holder connects the coil and the housing such that the coil is inserted into the magnetic gap, and the communication hole is disposed in the coil holder.

[0050] In some embodiments, the bone conduction acoustic assembly further includes an elastic member located in the first cavity, the elastic member having a central region connected to the magnetic circuit system and a peripheral region connected to the housing, such that the magnetic circuit system is suspended within the housing.

[0051] In some embodiments, the coil holder includes a main body portion and a first holder portion, the main body portion is connected to the elastic member, one end of the first holder portion is connected to the main body portion, the coil is connected to the other end of the first holder portion remote from the main body portion, and the communication hole is located at the connection point between the main body portion and the first holder portion.

[0052] In some embodiments, the communication holes are multiple in number and spaced apart circumferentially around the coil assembly.

[0053] In some embodiments, the cross-sectional area of ​​each of the communication holes is 2 mm 2 That's all.

[0054] In some embodiments, the housing has a decompression hole communicating with the first cavity, and a frequency response curve of the air-conducted sound output to the outside of the acoustic output device through the decompression hole has a resonance peak, and due to the provision of the communication hole, the peak resonance frequency of the resonance peak is 2 kHz or more.

[0055] In some embodiments, the peak resonant frequency of the resonant peak when the communication hole is in an open state shifts to a higher frequency than the peak resonant frequency of the resonant peak when the communication hole is not installed, and the shift amount is 500 Hz or more.

[0056] In some embodiments, the acoustic output device further includes a communication passage connecting the first cavity and the second cavity, and the peak resonant frequency of the resonant peak when the communication passage is in an open state shifts to a higher frequency than the peak resonant frequency of the resonant peak when the communication passage is in a closed state, and the shift is 500 Hz or more.

[0057] In some embodiments, a frequency response curve of the air-conducted sound output to the outside of the acoustic output device through the sound output hole has a resonance peak, and the peak resonance frequency of the resonance peak is 2 kHz or more.

[0058] In some embodiments, the communication passage includes a hole array disposed in the vibrating membrane, and at least some of the holes in the hole array and the sound emission holes are located on opposite sides of the bone conduction acoustic assembly, respectively.

[0059] In some embodiments, the actual area of ​​at least one hole in the hole array is less than 0.01 mm 2 ~0.04mm 2 is located.

[0060] In some embodiments, the bone conduction acoustic assembly includes a magnetic circuit system and a coil assembly, the magnetic circuit system forms a magnetic gap, the coil assembly is installed in the first cavity and inserted into the magnetic gap, and the communication passage passes through the magnetic circuit system to communicate the first cavity and the second cavity.

[0061] In some embodiments, the housing further includes a decompression hole communicating with the first cavity and a sound adjustment hole communicating with the second cavity, and the communication passage is disposed outside the housing and communicates the decompression hole and the sound adjustment hole.

[0062] In some embodiments, an acoustic impedance network is provided in the communication path defined by the communication passage, and the acoustic impedance network has a void ratio of 18% or less.

[0063] The present application will be further illustrated by exemplary embodiments, which are not limiting and in which like numbers refer to like structures, and are illustrated in detail in the drawings. [Brief description of the drawings]

[0064] [Figure 1] FIG. 1 is a schematic diagram of an audio output system according to some embodiments of the present application. [Diagram 2] 1 is a schematic diagram of an audio output device according to some embodiments of the present application. [Diagram 3] FIG. 1 is a block diagram of an audio output device according to some embodiments of the present application. [Figure 4] 1 is a schematic diagram of an audio output device according to some embodiments of the present application. [Diagram 5] 1 is a comparative schematic diagram of a frequency response curve of an audio output device according to some embodiments of the present application before a vibrating membrane is installed and a frequency response curve of the audio output device according to some embodiments of the present application before a vibrating membrane is installed and after a vibrating membrane is installed. [Figure 6]1 is a schematic diagram of an audio output device according to some further embodiments of the present application. [Figure 7A] FIG. 2 is an exemplary structural diagram of a sound-guiding member according to some embodiments of the present application. [Figure 7B] FIG. 2 is an exemplary structural diagram of a sound-guiding member according to some embodiments of the present application. [Figure 7C] FIG. 2 is an exemplary structural diagram of a sound-guiding member according to some embodiments of the present application. [Figure 7D] FIG. 2 is an exemplary structural diagram of a sound-guiding member according to some embodiments of the present application. [Figure 7E] FIG. 2 is an exemplary structural diagram of a sound-guiding member according to some embodiments of the present application. [Figure 8] FIG. 2 is a plan view showing the structure of an acoustic impedance network according to some embodiments of the present application. [Figure 9] 2 is a schematic diagram of a frequency response curve of air-conducted sound waves in a sound-guiding member according to some embodiments of the present application; [Figure 10] 1 is a schematic diagram of a frequency response curve of an air-conducted sound wave outputted to the outside of an acoustic output device through a sound output hole according to some embodiments of the present application. FIG. [Figure 11] 1 is a schematic diagram of a frequency response curve of air-conducted sound waves outputted to the outside of an acoustic output device through a decompression hole according to some embodiments of the present application. [Figure 12A] FIG. 11 is a schematic diagram of a sound pressure distribution in a second cavity when no sound adjustment hole is provided in an audio output device according to some embodiments of the present application. [Figure 12B] 11 is a schematic diagram of a sound pressure distribution in a second cavity when a sound adjustment hole is provided in an audio output device according to some embodiments of the present application. FIG. [Figure 13] 2 is a schematic diagram of a frequency response curve of air-conducted sound waves in a sound-guiding member according to some embodiments of the present application; [Figure 14] 10 is a schematic diagram of a frequency response curve of air-conducted sound waves in a sound-guiding member according to some other embodiments of the present application. [Figure 15] FIG. 2 is a schematic diagram of a frequency response curve of sound leakage of an audio output device according to some embodiments of the present application. [Figure 16A]1 is a cross-sectional view of a housing of an audio output device according to some embodiments of the present application. [Figure 16B] 1 is a cross-sectional view of a housing of an acoustic output device according to some embodiments of the present application. [Figure 16C] FIG. 2 is a left side view of a housing of an audio output device according to some embodiments of the present application. [Figure 16D] FIG. 2 is a plan view of a housing of an audio output device according to some embodiments of the present application. [Figure 17] 1 is a cross-sectional view showing a structure of an audio output device according to some embodiments of the present application. [Figure 18A] 1 is a schematic diagram of an audio output device according to some further embodiments of the present application. [Figure 18B] 1 is a schematic diagram of an audio output device according to some further embodiments of the present application. [Figure 19] FIG. 11 is a comparative schematic diagram of the frequency response curve of air-conducted sound waves at the decompression hole before the communication hole is installed and the frequency response curve of air-conducted sound waves at the decompression hole after the communication hole is installed in some embodiments of the acoustic output device of the present application. [Figure 20A] 1 is a schematic diagram of a vibration membrane according to some embodiments of the present application; [Figure 20B] 1 is a schematic diagram of a sound output device according to some embodiments of the present application. [Figure 20C] 1 is a schematic diagram of a sound output device according to some embodiments of the present application. [Figure 21] 2 is a schematic diagram of a frequency response curve of air-conducted sound waves in a sound-guiding member according to some embodiments of the present application; [Figure 22] 10 is a schematic diagram of a frequency response curve of air-conducted sound waves in a sound-guiding member according to some other embodiments of the present application. [Figure 23] 10 is a schematic diagram of a frequency response curve of air-conducted sound waves in a sound-guiding member according to some other embodiments of the present application. [Figure 24] 1A-1D are schematic diagrams of different positions for an audio output device according to some embodiments of the present application. [Diagram 25]25A-25C are schematic diagrams of frequency response curves of sound leakage of the audio output device at different positions in FIG. 24 according to some embodiments of the present application. [Figure 26] 25A-25C are schematic diagrams of frequency response curves of sound leakage of the audio output device at different positions in FIG. 24 according to some embodiments of the present application. [Figure 27] 25A-25C are schematic diagrams of frequency response curves of sound leakage of the audio output device at different positions in FIG. 24 according to some embodiments of the present application. [Figure 28] 25A-25C are schematic diagrams of frequency response curves of sound leakage of the audio output device at different positions in FIG. 24 according to some embodiments of the present application. [Figure 29] 25A-25C are schematic diagrams of frequency response curves of sound leakage of the audio output device at different positions in FIG. 24 according to some embodiments of the present application. [Diagram 30] FIG. 25 is a schematic diagram of frequency response curves of sound leakage for different audio output devices at the same position in FIG. 24 according to some embodiments of the present application. [Diagram 31] FIG. 25 is a schematic diagram of frequency response curves of sound leakage for different audio output devices at the same position in FIG. 24 according to some embodiments of the present application. [Diagram 32] FIG. 25 is a schematic diagram of frequency response curves of sound leakage for different audio output devices at the same position in FIG. 24 according to some embodiments of the present application. [Diagram 33] FIG. 25 is a schematic diagram of frequency response curves of sound leakage for different audio output devices at the same position in FIG. 24 according to some embodiments of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0065] In order to more clearly describe the technical means of the embodiments of the present application, the drawings necessary for the description of the embodiments will be briefly described below. Obviously, the drawings described below are only some of the examples or embodiments of the present application, and those skilled in the art can apply the present application to other similar scenarios based on these drawings without creative efforts. Unless otherwise clear from the language environment or described otherwise, the same symbols in the drawings indicate the same structures or operations.

[0066] It should be understood that the terms "system," "apparatus," "unit," and / or "module" used herein are ways of distinguishing between different levels of assemblies, elements, components, parts, or structures, however, other terms may be used in place of the above terms if they achieve the same purpose.

[0067] As used in this application and the claims, unless the context clearly dictates otherwise, terms such as "a," "one," "one kind," and / or "the" do not specifically refer to the singular but may include the plural. In general, the terms "comprise" and "containing" are merely intended to indicate the inclusion of explicitly identified steps and elements, and these steps and elements are not intended to be an exclusive listing, and a method or apparatus may include other steps or elements.

[0068] In this application, flowcharts are used to describe the operations performed by the system according to the embodiments of this application. It should be understood that the preceding and subsequent operations are not necessarily performed in exact order. Instead, the steps may be processed in reverse order or simultaneously. Also, other operations may be added to these processes, or one or more operations may be removed from these processes.

[0069] The embodiments of the present specification relate to an audio output device. The audio output device may include a bone conduction audio assembly, an air conduction audio assembly, and a housing that accommodates the bone conduction audio assembly and at least some elements in the air conduction audio assembly. In some embodiments, the bone conduction audio assembly may generate bone conduction acoustic waves, and when the bone conduction audio assembly generates bone conduction acoustic waves, the air conduction audio assembly may generate air conduction acoustic waves based on the vibration of the housing and / or the bone conduction audio assembly. In some embodiments, by installing one or more acoustic structures (e.g., sound emission holes, decompression holes, sound adjustment holes, sound guide passages, communication holes, etc.) in the audio output device, it is possible to improve the quality of the sound output from the audio output device, enrich the sound in the mid-low frequency range of the audio output device, reduce the sound leakage of the audio output device, and improve the audio experience of the user. For example, the housing of the acoustic output device may include a first cavity (which may be referred to as a front cavity) and a second cavity (which may be referred to as a rear cavity), and the housing may be provided with a sound emission hole communicating with the second cavity, and the air-conducted sound wave may be transmitted to the outside of the acoustic output device through the sound emission hole. In some embodiments, the frequency response curve of the air-conducted sound wave may have one or more resonance peaks, and the peak resonance frequency of the resonance peak may be 1 kHz or more. Also, for example, the side wall of the housing of the acoustic output device may further be provided with at least one decompression hole communicating with the first cavity, and the decompression hole can adjust the pressure in the first cavity by promoting communication between the first cavity and the outside of the acoustic output device, thereby helping to adjust the frequency response of the air-conducted acoustic assembly at low frequencies. In some embodiments, by adjusting the number, dimensions, shapes, positions, etc. of one or more acoustic structures (e.g., sound emission holes, pressure reduction holes, sound articulation holes, sound conduction passages, communication holes, etc.) in the audio output device, the frequency response curve of the audio output device can be optimized to improve the quality of the sound output from the audio output device.For example, in the audio output device, the spacing between the decompression hole communicating with the first cavity and the tuning hole communicating with the second cavity may be relatively small (for example, the decompression hole and the tuning hole may be installed in two adjacent side walls of the housing, respectively), so that the air-conducted sound waves output to the outside of the audio output device via the decompression hole and the tuning hole, respectively, interfere and cancel each other out in as high a frequency band as possible (for example, 2 kHz to 4 kHz), thereby reducing sound leakage from the audio output device and improving the sound quality of the audio output device.

[0070] 1 is a schematic diagram of an audio output system according to some embodiments of the present application. As shown in FIG. 1, the audio output system 100 may include a multimedia platform 110, a network 120, an audio output device 130, a user terminal 140, and a storage device 150.

[0071] The multimedia platform 110 may communicate with one or more assemblies of the audio output system 100 or with an external data source (e.g., a cloud data center). In some embodiments, the multimedia platform 110 may provide data or signals (e.g., audio data of music) to the audio output device 130 and / or the user terminal 140. In some embodiments, the multimedia platform 110 may be used for data / signal processing of the audio output device 130 and / or the user terminal 140. In some embodiments, the multimedia platform 110 may be implemented in a single server or a group of servers. The group of servers may be a distributed group of servers connected to the network 120 via one or more access points or a centralized group of servers connected to the network 120 via one or more access points. In some embodiments, the multimedia platform 110 may be connected locally to the network 120 or remotely to the network 120. For example, the multimedia platform 110 may access information and / or data stored in the audio output device 130, the user terminal 140 and / or the storage device 150 via the network 120. As another example, storage device 150 may be used as a back-end data memory for multimedia platform 110. In some embodiments, multimedia platform 110 may be implemented in a cloud platform. By way of example only, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, a multi-cloud, etc., or any combination thereof.

[0072] In some embodiments, multimedia platform 110 may include a processing device 112. Processing device 112 may perform the primary functions of multimedia platform 110. For example, processing device 112 may retrieve audio data from storage device 150 and transmit the retrieved audio data to audio output device 130 and / or user terminal 140 to generate sound. In other embodiments, processing device 112 may process signals for audio output device 130 (e.g., generate control signals).

[0073] In some embodiments, processing device 112 may include one or more processing units (e.g., a single-core processing device or a multi-core processing device). By way of illustrative example only, processing device 112 may include a central processing unit (CPU), an application specific integrated circuit (ASIC), an application specific instruction set processor (ASIP), a graphics processing unit (GPU), a physical processing unit (PPU), a digital signal processor (DSP), a field programmable gate array (FPGA), a programmable logic device (PLD), a controller, a microcontroller unit, a reduced instruction set computer (RISC), a microprocessor, or the like, or any combination thereof.

[0074] Network 120 may facilitate the exchange of information and / or data. In some embodiments, one or more assemblies in audio output system 100 (e.g., multimedia platform 110, audio output device 130, user terminal 140, and storage device 150) may transmit information and / or data to other assemblies in audio output system 100 via network 120. In some embodiments, network 120 may be any type of wired or wireless network or combination thereof. By way of illustrative example only, network 120 may include a cable network, a wired network, an optical fiber network, a telecommunications network, an intranet, the Internet, a local area network (LAN), a wide area network (WAN), a wireless local area network (WLAN), a metropolitan area network (MAN), a public switched telephone network (PSTN), a Bluetooth network, a ZigBee network, a near field communication (NFC) network, or the like, or any combination thereof. In some embodiments, network 120 may include one or more network access points. For example, network 120 may include wired or wireless network access points, base stations and / or Internet switching points, etc., and one or more assemblies of audio output system 100 may be connected to network 120 to exchange data and / or information.

[0075] The audio output device 130 may also output audio to the user and interact with the user. In some embodiments, the audio output device 130 may provide audio content to the user, such as at least songs, poetry, news broadcasts, weather broadcasts, audio lessons, etc. In some embodiments, the user may provide feedback to the audio output device 130, for example, via keys, screen touch, body movements, voice, gestures, thoughts, etc. In some embodiments, the audio output device 130 may be a wearable device. Unless otherwise stated, a wearable device as used herein may include earphones and various other types of personal devices, such as head-worn, shoulder-worn, or body-worn devices. The wearable device may provide at least audio content to the user with or without contacting the user. In some embodiments, the wearable device may include smart earphones, head-mounted displays (HMDs), smart bracelets, smart shoes, smart watches, smart clothing, smart bag packages, smart accessories, virtual reality helmets, etc., or any combination thereof.

[0076] The audio output device 130 can communicate with the user terminal 140 via the network 120. In some embodiments, the various types of data and / or information may be user gestures (e.g., shaking hands, shaking head, etc.) received via the audio output device 130. In some embodiments, the various types of data and / or information may include, but are not limited to, motion parameters (e.g., geographic location, moving direction, moving speed, acceleration, etc.), audio parameters (audio volume, audio content, etc.), etc. In some embodiments, the audio output device 130 may further transmit the received data and / or information to the multimedia platform 110 or the user terminal 140. For a detailed description of the audio output device 130, please refer to the detailed descriptions elsewhere in this application, such as FIGS. 2 to 3.

[0077] In some embodiments, the user terminal 140 may be configured for customization, for example, by installing an application program on the user terminal 140, which may communicate with and / or process data and / or signals of the audio output device 130. The user terminal 140 may include a mobile device 130-1, a tablet computer 130-2, a laptop computer 130-3, an in-vehicle built-in device 130-4, etc., or any combination thereof. In some embodiments, the mobile device 130-1 may include a smart home device, a smart mobile device, etc., or any combination thereof. In some embodiments, the smart home device may include a smart lighting device, a smart electrical control device, a smart monitoring device, a smart television, a smart camera, an intercom, etc., or any combination thereof. In some embodiments, the smart mobile device may include a smartphone, a personal digital assistant (PDA), a game device, a navigation device, etc., or any combination thereof. In some embodiments, the in-vehicle built-in device 130-4 may include an in-vehicle built-in computer, an in-vehicle television, an in-vehicle tablet computer, etc. In some embodiments, user terminal 140 may include a signal transmitter and a signal receiver configured to communicate with a user and / or a measuring device (not shown) that measures the location of user terminal 140. In some embodiments, multimedia platform 110 or storage device 150 may be integrated into user terminal 140. In such a case, user terminal 140 may similarly implement the functionality available from multimedia platform 110 described above.

[0078] Storage device 150 may store data and / or instructions. In some embodiments, storage device 150 may store data obtained from multimedia platform 110, audio output device 130, and / or user terminal 140. In some embodiments, storage device 150 may store data and / or instructions capable of implementing various functions of multimedia platform 110, audio output device 130, and / or user terminal 140. In some embodiments, storage device 150 may include mass memory, removable memory, volatile read-write memory, read-only memory (ROM), etc., or any combination thereof. Exemplary mass memory may include, for example, magnetic disks, optical disks, solid-state drives, etc. Exemplary removable memory may include flash drives, floppy disks, optical disks, memory cards, compact disks, magnetic tapes, etc. Exemplary volatile read-write memory may include random access memory (RAM). Exemplary RAM may include dynamic random access memory (DRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), static random access memory (SRAM), thyristor random access memory (T-RAM), zero capacitor random access memory (Z-RAM), and the like. Exemplary ROM may include programmable ROM (PROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), compact disc ROM (CD-ROM), digital versatile disc ROM, and the like. In some embodiments, the storage device 150 may be implemented on a cloud platform. By way of example only, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, a multi-cloud, and the like, or any combination thereof. In some embodiments, one or more assemblies in the audio output system 100 may access data and / or instructions stored in the storage device 150 via the network 120.In some embodiments, storage device 150 may be directly connected to multimedia platform 110 as a back-end memory.

[0079] In some embodiments, the multimedia platform 110, the network 120, the user terminal 140 and / or the storage device 150 may be integrated into the audio output device 130. Specifically, with the advancement of technology and the improvement of the processing power of the audio output device 130, the audio output device 130 may perform all the processing. For example, the audio output device 130 may be a smart earphone, an MP3 player, etc., with highly integrated electronic elements (e.g., a central processing unit (CPU), a graphics processing unit (GPU), etc.).

[0080] 2 is a schematic diagram of an audio output device according to some embodiments of the present application. As shown in FIG. 2, the audio output device 200 may include an ear hook 210, a housing 220, a circuit housing 230, a back hook 240, an audio assembly 250, a control circuit 260, and a battery 270. The housing 220 and the circuit housing 230 may be disposed at both ends of the ear hook 210, respectively, and the back hook 240 may be disposed at one end of the circuit housing 230 remote from the ear hook 210. The housing 220 may house a different audio assembly 250. The circuit housing 230 may house the control circuit 260 and the battery 270. Each end of the back hook 240 may be physically connected to a corresponding circuit housing 230. The ear hook 210 may be configured to fix the housing 220 and the audio assembly 250 in a predetermined position on the user's ear when the user is wearing the audio output device 200.

[0081] In some embodiments, the ear hook 210 may include an elastic support member, and when the user wears the audio output device 200, the audio output device 200 may be hung on the ear. The elastic support member is arranged to maintain the ear hook 210 in a shape that matches the user's ear, so that the ear hook 210 can generate elastic deformation that fits according to the shape of the ear and the shape of the user's head. When the user wears the audio output device 200, the elastic support member can adapt to users with different ear shapes and head shapes. In some embodiments, the elastic support member may be a memory alloy with good deformation recovery ability. The memory alloy is a material made of two or more metal elements that have a shape memory effect due to thermoelasticity and martensitic transformation and its inverse transformation. In some embodiments, the memory alloy includes any one or more of nickel titanium alloy, copper zinc alloy, iron manganese alloy, nickel aluminum alloy, gold cadmium alloy, etc., but is not limited to these. In some embodiments, the elastic support member may be a support member made of other materials (e.g., organic polymer materials). In some embodiments, the organic polymer material may include any one or more of rubber, synthetic fiber, plastic, and the like. In some embodiments, the elastic support member may be made of a non-memory alloy. In some embodiments, the conductor in the elastic support member may establish an electrical connection between the acoustic assembly 250 and other members (e.g., the control circuit 260, the battery 270, and the like) to facilitate power and data transmission of the acoustic assembly 250. In some embodiments, the ear hook 210 further includes a protective cover 211 and a housing protective member 212 integrally formed with the protective cover 211, the protective cover 211 is covered on the outside of the elastic support member, and the housing protective member 212 is covered on the outside of the housing 220 and fits the housing 220.

[0082] The housing 220 may be configured to accommodate the acoustic assembly 250. In some embodiments, the acoustic assembly 250 may include a bone conduction acoustic assembly, an air conduction acoustic assembly, etc. The bone conduction acoustic assembly may be configured to output sound waves (also referred to as bone conduction sound waves) through a solid medium (e.g., a skeleton). For example, the bone conduction acoustic assembly may convert an audio signal (e.g., an electrical signal) into vibration and transmit it to a user's skeleton (e.g., a skull). In some embodiments, the bone conduction acoustic assembly may include a magnetic circuit system, one or more diaphragms, and a voice coil. The magnetic circuit system may generate a magnetic field, so that the voice coil located in the magnetic gap vibrates under the action of the magnetic field, and the vibration of the voice coil may drive the one or more diaphragms to vibrate. At least one of the one or more diaphragms may be physically connected to the housing 220, which is in contact with the user's skin (e.g., the skin on the user's head) and can transmit the bone conduction sound waves to the cochlea of ​​the user wearing the acoustic output device 200. The air conduction acoustic assembly may be configured to output sound waves through the air (also referred to as air-conducted acoustic waves). For example, the air conduction acoustic assembly may convert vibrations of the housing 220, the bone conduction acoustic assembly, and / or vibrations of the air within the housing 220 into air vibrations that can be received by the user's ear. In some embodiments, the air conduction acoustic assembly may include at least one diaphragm, which may be physically connected to the bone conduction acoustic assembly and / or the housing 220. When the bone conduction acoustic assembly (e.g., one or more diaphragms) vibrates to generate bone conduction acoustic waves, the vibrations of the bone conduction acoustic assembly (e.g., one or more diaphragms) can drive vibrations of the housing 220 and / or the bone conduction acoustic assembly and / or a diaphragm physically connected to the housing 220. The vibrations of the diaphragm can vibrate the air within the housing 220. The air vibrations within the housing 220 can be transferred from the housing 220 to generate air-conducted acoustic waves.For more information regarding the bone conduction acoustic assembly and the air conduction acoustic assembly, please refer to the detailed descriptions elsewhere in this application, for example, Figures 3 to 4.

[0083] In some embodiments, the acoustic assembly 250 and the housing 220 may be two in number and may correspond to the left and right ears of the user and the area nearby, respectively. In some embodiments, the acoustic assembly 250 and the housing 220 may be one in number and may be distributed to the left or right ear of the user and the area nearby when the user wears the audio output device 200. Details of the acoustic assembly 250 can be found elsewhere in this application, for example, in Figures 3 to 6 and their related descriptions. It is noted that the audio output device 200 may have other wearing manners, for example, the ear hook 210 covers or wraps the user's ear, and the back hook 240 straddles the top of the user's head. Also, for example, the audio output device 200 may not include the back hook 240, and the ear hook 210 may be directly suspended from the user's auricle such that the audio output device 200 is located at the user's ear or the area nearby.

[0084] In some embodiments, the housing 220 may be provided with a contact surface 221. The contact surface 221 may contact the skin of a user. In some embodiments, the contact surface 221 may be referred to as an upper surface, a skin contact area, etc. of the housing 220. A surface of the housing 220 opposite to the upper surface of the housing 220 may be referred to as a rear surface or back surface of the housing 220. Bone conduction sound waves generated by one or more bone conduction acoustic assemblies of the acoustic assembly 250 in the acoustic output device 130 may be transmitted to the outside through the contact surface 221 of the housing 220. In some embodiments, the material and thickness of the contact surface 221 affect the transmission of the bone conduction sound waves to the user, thereby affecting the sound quality. For example, if the material of the contact surface 221 is relatively soft, the transmission of the bone conduction sound waves in the low frequency range may be better than the transmission of the bone conduction sound waves in the high frequency range. On the other hand, if the material of the contact surface 221 is relatively hard, the transmission of the bone conduction sound waves in the high frequency range may be better than the transmission of the bone conduction sound waves in the low frequency range.

[0085] 3 is a block diagram of an acoustic output device according to some embodiments of the present application. As shown in FIG. 3, the acoustic output device 300 may include a bone conduction acoustic assembly 310, an air conduction acoustic assembly 320, and a housing 330 that houses at least some elements of the bone conduction acoustic assembly 310 and the air conduction acoustic assembly 320.

[0086] The bone conduction acoustic assembly 310 can generate bone conduction acoustic waves. In some embodiments, the bone conduction acoustic assembly 310 can generate bone conduction acoustic waves based on the control signal generated by the signal processing module within a particular frequency range (e.g., low frequency range, medium frequency range, high frequency range, low-mid frequency region, high-mid frequency range, etc.). In some embodiments, the bone conduction acoustic waves may be acoustic waves that are conducted in the form of mechanical vibrations through a solid medium (e.g., bone bones). In some embodiments, the low frequency range (also referred to as low frequency) may be in the frequency range of 20 Hz to 150 Hz, the medium frequency range (also referred to as medium frequency) may be in the frequency range of 150 Hz to 5 kHz, the high frequency range (also referred to as high frequency) may be in the frequency range of 5 kHz to 20 kHz, the low-mid frequency range (also referred to as low-mid frequency) may be in the frequency range of 150 Hz to 500 Hz, and the high-mid frequency range (also referred to as high-mid frequency) may be in the frequency range of 500 Hz to 5 kHz. As another example, the low frequency range may be a frequency range of 20Hz to 300Hz, the medium frequency range may be a frequency range of 300Hz to 3kHz, the high frequency range may be a frequency range of 3kHz to 20kHz, the low-mid frequency range may be a frequency range of 100Hz to 1000Hz, and the high-mid frequency range may be a frequency range of 1000Hz to 10kHz. Note that the values ​​of the frequency ranges are merely for explanation and are not limiting. The definitions of the above frequency ranges may vary according to different application scenarios and different classification standards. For example, in some other application scenarios, the low frequency range may be a frequency range of 20Hz to 80Hz, the medium frequency range may be a frequency range of 160Hz to 1280Hz, the high frequency range may be a frequency range of 2560Hz to 20kHz, the low-mid frequency range may be a frequency range of 80Hz to 160Hz, and the high-mid frequency range may be a frequency range of 1280Hz to 2560Hz. Preferably, the different frequency ranges may or may not have overlapping frequencies. For more information regarding the bone conduction acoustic assembly 310, please refer to other parts of this specification, such as Figures 4, 17, 18A, 18B and their associated descriptions.

[0087] The air-conducting acoustic assembly 320 may generate air-conducted acoustic waves. In some embodiments, the air-conducting acoustic assembly 320 may generate air-conducted acoustic waves based on the vibration of the bone-conducting acoustic assembly 310, the vibration of the housing 330 that accommodates the bone-conducting acoustic assembly 310 and the air-conducting acoustic assembly 320, the vibration of the air in the housing 330, and / or a control signal. In some embodiments, the air-conducting acoustic assembly 320 may generate air-conducted acoustic waves in the same or different frequency range as the vibration of the bone-conducting acoustic assembly 310. In some embodiments, the air-conducting acoustic assembly 320 may include at least one vibrating membrane, and the at least one vibrating membrane may be connected to the bone-conducting acoustic assembly 310 or the housing 330, and the air-conducted acoustic waves may be generated based on the vibration of the at least one vibrating membrane or the housing 330. In some embodiments, the air-conducted acoustic waves may be acoustic waves conducted by air vibrations. For more information on the air-conducting acoustic assembly 320, please refer to other parts of this specification, such as FIG. 4, FIG. 20A, and their related descriptions.

[0088] The housing 330 may house at least some elements of the bone conduction acoustic assembly 310 and the air conduction acoustic assembly 320. In some embodiments, the housing 330 may include a first cavity and a second cavity separated by a diaphragm in the air conduction acoustic assembly 320. In some embodiments, the housing 330 may include a first portion and a second portion. The first portion of the housing 330 and the diaphragm may form the first cavity. The bone conduction acoustic assembly 310 may be disposed within the first cavity. The first portion (e.g., one or more diaphragms) of the housing 330 surrounding the first cavity may be physically connected to the bone conduction acoustic assembly 310. When a user wears the acoustic output device 300, the first portion of the housing 330 may transmit vibrations of the bone conduction acoustic assembly 310 to the user's bone structure. The second portion of the housing 330 and the diaphragm may form the second cavity. The air-conducted sound waves generated by the air-conducting acoustic assembly 320 may be transmitted from the second cavity to the outside of the acoustic output device 300. In some embodiments, the first cavity and the second cavity may not communicate with each other. In some embodiments, the first cavity and the second cavity may communicate with each other, for example, one or more through holes may be provided in the diaphragm. In some embodiments, the first cavity may accommodate at least a part of the bone-conducting acoustic assembly 310, and the housing 330 may have one or more sound emission holes that communicate with the second cavity, and the air-conducted sound waves may be transmitted to the outside of the acoustic output device 300 through the sound emission holes. In some embodiments, when a user wears the acoustic output device 300, the sound emission holes may face the ear canal of the user's ear, so that the air-conducted sound waves can be transmitted to the cochlea of ​​the user through the sound emission holes.

[0089] In some embodiments, the acoustic output device 300 may further include a signal processing module. The bone conduction acoustic assembly 310 may be electrically connected to the signal processing module to receive a control signal (e.g., an audio signal) and generate bone conduction acoustic waves based on the control signal. For example, the bone conduction acoustic assembly 310 may include any element (e.g., a vibration motor, an electromagnetic vibration device, etc.) that converts an electrical signal into a mechanical vibration signal. Exemplary signal conversion methods include, but are not limited to, electromagnetic type (e.g., a moving coil type, a moving iron type, a magnetostrictive type), a piezoelectric type, an electrostatic type, etc. The internal structure of the bone conduction acoustic assembly 310 may be a single resonance system or a multiple resonance system. In some embodiments, the bone conduction acoustic assembly 310 may generate mechanical vibrations based on the bone conduction control signal, and the mechanical vibrations may generate bone conduction acoustic waves.

[0090] 4 is a schematic diagram of an acoustic output device according to some embodiments of the present application. As shown in FIG. 4, the acoustic output device 400 may include a bone conduction acoustic assembly 410, a housing 420, and an air conduction acoustic assembly. The bone conduction acoustic assembly 410 and the air conduction acoustic assembly may be located inside the housing 420. The bone conduction acoustic assembly 410 may generate bone conduction acoustic waves that are transmitted to a user through the housing 420, and the air conduction acoustic assembly may generate air conduction acoustic waves based on vibration of the bone conduction acoustic assembly 410. The air conduction acoustic waves may be transmitted to a user through one or more sound emission holes (also called sound guide holes) on the housing 420.

[0091] In some embodiments, the bone conduction acoustic assembly 410 may include a magnetic circuit system 411, one or more diaphragms 412, and a voice coil 413. The magnetic circuit system 411 may include one or more magnetic and / or magnetically permeable elements configured to generate a magnetic field. In some embodiments, the magnetic circuit system 411 may include a magnetic gap, the magnetic circuit system 411 may generate a magnetic field in the magnetic gap, and the voice coil 413 may be located in the magnetic gap. At least one of the one or more diaphragms 412 may be physically connected to a housing 420, which is in contact with a user's skin (e.g., skin on a user's head) and capable of transmitting bone conduction sound waves to the cochlea of ​​a user wearing the acoustic output device 400. In some embodiments, one of the diaphragms 412 may be referred to as a top wall of the housing 420. As described herein, when a user wears the acoustic output device, the wall closest to the skin is referred to as the top or front wall (also referred to as the area that contacts the user's skin, contact surface, etc.), and the wall furthest from the skin (e.g., the wall opposite the top wall) is referred to as the bottom or back wall, and the cavity in the housing corresponding to the top wall of the housing may be referred to as the front cavity (e.g., the first cavity), which is close to the skin area where the user contacts the housing, and the cavity corresponding to the bottom wall may be referred to as the rear cavity (e.g., the second cavity), which is away from the skin area where the user contacts the housing. The voice coil 413 may be mechanically connected to one or more diaphragms 412. In some embodiments, the voice coil 413 may be electrically connected to a signal processing module. When a current (which may represent a control signal) is introduced to the voice coil 413, the voice coil 413 may vibrate in a magnetic field and drive one or more diaphragms 412 to vibrate. The vibrations of the one or more diaphragms 412 can be transmitted through the housing 420 to the user's bone structure to generate bone-conducted sound waves. In some embodiments, the vibrations of the one or more diaphragms 412 can cause the housing 420 and / or the magnetic circuit system 411 to vibrate.Vibrations of the housing 420 and / or the magnetic circuit system 411 may cause the air within the housing 420 to vibrate.

[0092] The air conduction acoustic assembly may include a diaphragm 431. The diaphragm 431 may be physically connected to the bone conduction acoustic assembly 410 and / or the housing 420. For example, the diaphragm 431 may be connected to at least one of the magnetic circuit system 411, the voice coil 413, and / or the one or more diaphragms 412. When the bone conduction acoustic assembly 410 (e.g., the one or more diaphragms 412) vibrates to generate bone conduction sound waves, the vibration of the bone conduction acoustic assembly 410 (e.g., the one or more diaphragms 412) can drive the vibration of the housing 420 and / or the diaphragm 431 physically connected to the bone conduction acoustic assembly 410 and / or the housing 420. The vibration of the diaphragm 431 can vibrate the air in the housing 420. The air vibration in the housing 420 can be transmitted from the housing 420 to generate air conduction sound waves. The air conduction sound waves and the bone conduction sound waves can represent the same audio signal input to the bone conduction acoustic assembly 410 or the same audio signal received by a user. In this specification, the air-conducted sound waves and the bone-conducted sound waves represent the same audio signal, which means that the air-conducted sound waves and the bone-conducted sound waves represent the same audio content, and the audio content may be represented by the frequency components of the air-conducted sound waves and the bone-conducted sound waves. In some embodiments, the frequency components in the air-conducted sound waves and the bone-conducted sound waves may be different. For example, the bone-conducted sound waves may include more low-frequency components, and the air-conducted sound waves may include more high-frequency components. In some embodiments, the vibrating membrane 431 may be physically connected to the magnetic circuit system 411, and the vibrating membrane 431 and the magnetic circuit system 411 may be considered as fixed, and the vibration of the vibrating membrane 431 relative to the housing 420 can change the pressure in the first cavity 423 and the second cavity 424 to vibrate the air in the first cavity 423 and the second cavity 424.In some embodiments, the vibrating membrane 431 may be physically connected to the magnetic circuit system 411 and the housing 420 may be considered to be fixed, and vibration of the vibrating membrane 431 and the magnetic circuit system 411 relative to the housing 420 can change the pressure in the first cavity 423 and the second cavity 424, causing the air in the first cavity 423 and the second cavity 424 to vibrate.

[0093] In some embodiments, the vibrating membrane 431 may include a main body portion and an auxiliary portion. The main body portion may be physically connected to a bottom surface of the magnetic circuit system 411 away from the top wall of the housing 420. In some embodiments, the main body portion of the vibrating membrane 431 may include a plate (e.g., a circular plate or an annular plate) that can cover at least a part of the bottom surface of the magnetic circuit system 411. In some embodiments, the main body portion of the vibrating membrane 431 may include a plate (e.g., a circular plate or an annular plate) that can cover at least a part of the bottom surface of the magnetic circuit system 411 and a side wall connected to the side wall of the magnetic circuit system 411. In some embodiments, the auxiliary portion of the vibrating membrane 431 may be annular in shape surrounding the main body portion of the vibrating membrane 431. The auxiliary portion of the vibrating membrane 431 may be physically connected to the housing 420. For example, the inner side of the auxiliary portion of the vibrating membrane 431 may be in contact with or connected to the outer side of the main body portion of the vibrating membrane 431, and the outer side may be physically connected to the housing 420. In some embodiments, the auxiliary portion of the vibrating membrane 431 may include at least one of a protruding region or a recessed region. In some embodiments, the vibrating membrane 431 may be a thin film made of a material that is sensitive to vibration.In some embodiments, the material of the vibration membrane 431 is polycarbonate (PC), polyamides (PA), acrylonitrile butadiene styrene (ABS), polystyrene (PS), high impact polystyrene (HIPS), polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyurethane (PU), polyethylene (PE), phenolic resin (Phenol), and the like. The polyolefin resin may be any one of or a combination of polyolefin resins selected from the group consisting of polypropylene (PP), polypropylene glycol ester (PEN), polyetherimide (PEEK), polypropylene glycol ester (PP), polypropylene glycol ester (PPE ...

[0094] In some embodiments, the acoustic output device 400 can generate bone-conducted sound waves under the action of the bone-conducted acoustic assembly 410, and the bone-conducted sound waves may have a frequency response curve, and the frequency response curve may have at least one resonant peak. The skin contact area of ​​the acoustic output device 400 has a first frequency response curve (e.g., indicated by "k1+k2" in FIG. 5) for the bone-conducted sound waves generated when the vibrating membrane 413 is connected to the bone-conducted acoustic assembly 410 and the housing 420, and the skin contact area of ​​the acoustic output device 400 has a second frequency response curve (indicated by "k1" in FIG. 5) for the bone-conducted sound waves generated when the vibrating membrane 413 is disconnected from either the bone-conducted acoustic assembly 410 or the housing 420. In some embodiments, the peak resonant frequencies of the resonant peaks corresponding to the first and second frequency response curves can satisfy the relation (1).

[0095] |f1-f2| / f1≦50% (1)

[0096] In the formula, f1 is the peak resonant frequency of the bone-conducted sound wave generated when the vibrating membrane 413 is connected to the bone-conducted acoustic assembly 410 and the housing 420, and f2 is the peak resonant frequency of the bone-conducted sound wave generated when the vibrating membrane 413 is disconnected from either the bone-conducted acoustic assembly 410 or the housing 420. Note that the value of the relationship |f1-f2| / f1 between the peak resonant frequency f1 and the peak resonant frequency f2 in the above relational formula (1) may be other numerical values, for example, 60%, 40%, 30%, 20%, or less. In some embodiments, the difference between the peak resonant intensity corresponding to the peak resonant frequency f1 and the peak resonant intensity corresponding to the peak resonant frequency f2 may be 5 dB or less. In some embodiments, the difference between the peak resonant intensity corresponding to the peak resonant frequency f1 and the peak resonant frequency f2 may be other numerical values, for example, 3 dB, 4 dB, 6 dB, or less. It may be understood that |f1-f2| / f1 can evaluate the influence of the vibrating membrane 413 on the vibration of the user's skin contact area caused by the bone conduction acoustic assembly 410. The smaller the value of the ratio of |f1-f2| / f1, the smaller the influence of the vibrating membrane 413 on the vibration received by the user's skin contact area by the bone conduction acoustic assembly 410 can be, and it may be understood that installing the vibrating membrane 413 on the sound output device 400 basically does not bring about a strong sense of vibration, and therefore it can be guaranteed that the user will receive a high sense of experience when wearing the sound output device 400. Therefore, by introducing the vibrating membrane 413 while minimizing the influence on the original resonance system of the sound output device 400, the sound output device 400 can output bone conduction sound waves and air conduction sound waves having the same or close phase in synchronization with each other, and further, the sound expressiveness of the sound output device 400 is improved, and the sound output device 400 becomes more power-saving. As an illustrative example, the amount of shift in the low frequency band or the mid-low frequency band (e.g., f1≦500 Hz) in the frequency response curve can satisfy certain conditions so that the low and mid-low frequencies of bone-conducted sound waves are affected as little as possible.In some embodiments, the amount of movement of the low frequency band or the mid-low frequency band (e.g., f1≦500 Hz) in the frequency response curve may be 50 Hz or less, i.e., |f1-f2|≦50 Hz, so that the vibrating membrane 413 has as little effect as possible on the vibration of the user's skin contact area by the bone conduction acoustic assembly 410. In some embodiments, the amount of movement of the low frequency band or the mid-low frequency band (e.g., f1≦500 Hz) in the frequency response curve may be 5 Hz or more, i.e., |f1-f2|≧5 Hz, so that the vibrating membrane 413 has a certain structural strength and elasticity, reduces fatigue deformation in the process of using the vibrating membrane 413, and further extends the service life of the vibrating membrane 413. Note that, in some embodiments, the skin contact area may include at least a part of the housing area where the housing 420 contacts the user's skin when the user wears the sound output device 400. For example, FIG. 5 is a comparative schematic diagram of a frequency response curve of an acoustic output device according to some embodiments of the present application before a vibrating membrane is installed and a frequency response curve after a vibrating membrane is installed. As shown in Fig. 5, the horizontal axis indicates frequency in Hz, and the vertical axis indicates intensity in dB. The first frequency response curve 510 (indicated by "k1+k2" in Fig. 5) has a resonance peak (point "A" in Fig. 5) in the low frequency band or the medium-low frequency band (e.g., 10Hz to 500Hz), the peak resonance frequency f1 of the resonance peak is about 112Hz, and the peak resonance intensity is about 88dB. The second frequency response curve 520 (indicated by "k1" in Fig. 5) has a resonance peak (point "B" in Fig. 5) in the low frequency band or the medium-low frequency band (e.g., 10Hz to 500Hz), the peak resonance frequency f2 of the resonance peak is about 95Hz, and the peak resonance intensity is about 87dB. It can be seen that the difference (or absolute value) between the peak resonance frequency f1 and the peak resonance frequency f2 is about 17 Hz, that is, the amount of movement of the low frequency band or the mid-low frequency band (e.g., f1≦500 Hz) in the frequency response curve is about 17z. The difference between the peak resonance intensity corresponding to the peak resonance frequency f1 and the peak resonance intensity corresponding to the peak resonance frequency f2 is about 1 dB.In some embodiments, in the elastic range of the diaphragm, the greater the elasticity of the diaphragm, the greater the amount of movement in the low frequency band or the mid-low frequency band in the frequency response curve, and by adjusting the elasticity of the diaphragm, the magnitude of the amount of movement in a specific frequency band (e.g., the low frequency band or the mid-low frequency band) in the frequency response curve can be adjusted. For example, by reducing the elasticity of the diaphragm (using a material with a small elastic coefficient), the amount of movement in the mid-low frequency band or the mid-low frequency band in the frequency curve is reduced. Furthermore, as shown in FIG. 4, in some embodiments, the housing 420 may include a first portion and a second portion. The first portion of the housing 420 and the diaphragm 431 may form a first cavity 423. The first portion surrounding the first cavity 423 may be physically connected to the bone conduction acoustic assembly 410 (e.g., one or more diaphragms 412), and when a user wears the acoustic output device 400, the first portion of the housing 420 or the one or more diaphragms 412 disposed on the first portion of the housing 420 may transmit vibrations of the bone conduction acoustic assembly 410 to the user's bone structure. The second portion of the housing 420 and the diaphragm 431 may form a second cavity 424. Air conducted sound waves generated by the air conducted acoustic assembly may be transmitted from the second cavity 424 to the outside of the acoustic output device 400.

[0097] In some embodiments, the housing 420 may include at least one sound emission hole 421, which transmits the air-conducted sound waves in the second cavity 424 to the outside of the acoustic output device 400. In some embodiments, the at least one sound emission hole 421 may be installed in a side wall of the second part of the housing 420, and the sound emission hole 421 may communicate with the second cavity 424. In some embodiments, the number of the sound emission holes 421 may be one or more. The magnetic circuit system 411 may also receive a corresponding reaction force through the interaction between the magnetic field and the voice coil 413, and drive the vibrating membrane 431 to vibrate. The vibration of the vibrating membrane 431 can vibrate the air in the second cavity 424. The air vibrations in the second cavity 424 generate air-conducted sound waves in the second cavity 424 , and the air-conducted sound waves can propagate from the second cavity 424 to the outside of the acoustic output device 400 via the sound emission hole 421 .

[0098] In some embodiments, when the housing 420 moves toward the front side of the acoustic output device 400 (i.e., along the direction indicated by arrow A or toward the user's skin) and the diaphragm 431 (where the housing 420 moves along the direction indicated by arrow A and the magnetic circuit system 411 and the diaphragm 431 are considered stationary) due to an interaction between the voice coil 413 and the magnetic circuit system 411 (i.e., vibration of the voice coil 413 under the magnetic field provided by the magnetic circuit system 411), the first cavity 423 in the housing 420 becomes larger and the second cavity 424 becomes smaller, and the pressure in the second cavity 424 increases. When the housing 420 moves toward the user's skin, the pressure of the one or more diaphragms 412 acting on the user's skin increases, and the bone conduction acoustic waves generated by the bone conduction acoustic assembly 410 can be defined as "positive phase". Similarly, as the pressure in the second cavity 424 increases, the air-conducted acoustic waves generated by the air-conducted acoustic assembly may be "in-phase". In some embodiments, the air-conducted acoustic waves and the bone-conducted acoustic waves may be in phase, i.e., the phase difference between the air-conducted acoustic waves and the bone-conducted acoustic waves may be equal to 0. In some embodiments, the phase difference between the air-conducted acoustic waves and the bone-conducted acoustic waves may be less than a threshold value, such as π, 2π / 3, π / 2, etc. As used herein, the phase difference between the air-conducted acoustic waves and the bone-conducted acoustic waves may be the absolute value of the difference between the air-conducted acoustic waves and the bone-conducted acoustic waves. In some embodiments, the difference frequency range between the air-conducted acoustic waves and the bone-conducted acoustic waves may correspond to different phase differences and different threshold values. For example, the phase difference between the air-conducted acoustic waves and the bone-conducted acoustic waves in a frequency range less than 300 Hz may be less than π. As another example, the phase difference between air-conducted sound waves and bone-conducted sound waves in a specific frequency range less than 1000 Hz (e.g., 300 Hz to 1000 Hz) may be less than 2π / 3. As another example, the phase difference between air-conducted sound waves and bone-conducted sound waves in a specific frequency range less than 3000 Hz (e.g., 1000 Hz to 3000 Hz) may be less than π / 2. Therefore, by improving the synchronism between bone-conducted sound waves and air-conducted sound waves, the bone-conducted sound waves and the air-conducted sound waves are superimposed, improving the hearing effect.

[0099] In some embodiments, the actual area of ​​the outlet end of the sound emission hole 421 is 8 mm or less so that the user can hear more of the air-conducted sound waves output through the sound emission hole 421. 2 In another embodiment, the actual area of ​​the outlet end of the sound outlet hole 421 is 10 mm 2 , 9mm 2 , 7mm 2 , 6mm 2 In some embodiments, the actual area of ​​the inlet end of the sound emission hole 421 may be equal to or greater than the actual area of ​​its outlet end. In some embodiments, the sound emission hole 421 may be provided with a damping structure (also called an acoustic impedance network) (e.g., a tuning network) to improve the acoustic effect of the air conduction acoustic assembly. In some embodiments, the output characteristics of the air conduction sound waves may be adjusted by adjusting the number, position, size, and / or shape of the sound emission holes 421. Note that the actual area of ​​the outlet end in the embodiments of this specification may be defined as the size of the area of ​​the end face on which the outlet end is located, and the actual area of ​​the inlet end in the embodiments of this specification may be defined as the size of the area of ​​the end face on which the inlet end is located. The area of ​​the end face on which the outlet end is located here may be understood as the area through which vibrations can pass through the end face of the outlet end via air. The area of ​​the end face on which the inlet end is located may be understood as the area through which vibrations can pass through the end face of the inlet end via air.

[0100] In some embodiments, the output characteristics of bone-conducted acoustic waves may be adjusted by adjusting the stiffness (e.g., structural dimensions, material modulus, etc.) of diaphragm 412 and / or housing 420. In some embodiments, the output characteristics of air-conducted acoustic waves may be adjusted by adjusting the shape, modulus, and damping of membrane 431.

[0101] Further, as shown in FIG. 4, in some embodiments, the housing 420 may be provided with at least one decompression hole 422 communicating with the first cavity 423. For example, the decompression hole 422 may be provided in a side wall of the first housing of the housing 420. The first cavity 423 may communicate with the outside of the acoustic output device 400 through the decompression hole 422. In some embodiments, the decompression hole 422 and the sound emission hole 421 may be provided in different side walls of the housing 420. In some embodiments, the decompression hole 422 and the sound emission hole 421 may be provided in different non-adjacent side walls of the housing 420, for example, side walls that are substantially parallel to each other. In some embodiments, the decompression hole 422 may be a through hole that facilitates pressure balance between the first cavity 423 of the housing 420 and the outside of the acoustic output device 400. In some embodiments, the vibration of the magnetic circuit system 411 relative to the housing 420 may increase or decrease the pressure in the first cavity 423. The decompression hole 422 can promote communication between the first cavity 423 and the outside and adjust the pressure in the first cavity 423 to maintain the mutual motion between the housing 420 and the magnetic circuit system 411 (and / or the vibrating membrane 431) and ensure the normal vibration of the housing 420. In some embodiments, the decompression hole 422 can help adjust the frequency response (e.g., the frequency response of the low frequency band) of the air-conducting acoustic assembly to achieve the effect of further reducing sound leakage. It should be understood that the vibration of the magnetic circuit system 411 relative to the housing 420 can vibrate the air in the first cavity 423. The air-conducted sound waves generated by the air vibration in the first cavity 423 can be transmitted to the outside of the acoustic output device 400 through the decompression hole 422, resulting in sound leakage. In some embodiments, parameters such as the dimensions, structure, acoustic impedance, and shape of the decompression hole 422 can be designed to adjust the frequency response of the air-conducting acoustic assembly, thereby reducing or suppressing sound leakage.In some embodiments, an acoustic impedance network (not shown) may be installed in the decompression hole 422 to reduce the intensity of the above-mentioned resonance peak, thereby reducing the frequency response in the structure formed by the first cavity 423 and the structure formed by the decompression hole 422, thereby achieving the effect of further reducing sound leakage. In some embodiments, the number of the decompression holes 422 may be one or more, and the position of the decompression hole 422 may be set at any position corresponding to the side wall of the first cavity 423, and is not limited here.

[0102] In some embodiments, the number of the decompression holes may be more than one. As a mere example, the at least one decompression hole may include a first decompression hole and a second decompression hole, the first decompression hole is located farther from the sound output hole 421 than the second decompression hole, and the effective area of ​​the outlet end of the first decompression hole is greater than the effective area of ​​the outlet end of the second decompression hole. The effective area here and the effective area of ​​a specific passage (e.g., a sound guide passage, etc.) or opening (e.g., a sound output hole, a sound tuning hole, a communication hole, etc.) introduced below may be defined as the product of its actual area and the porosity of the covered acoustic impedance network, that is, the area through which air can pass from the opening. For example, when an acoustic impedance network is covered at the outlet end of the decompression hole, the effective area of ​​the outlet end of the decompression hole is the product of the actual area of ​​the outlet end of the decompression hole and the porosity of the covered acoustic impedance network. Also, for example, when an acoustic impedance network is not covered at the outlet end of the decompression hole, the effective area of ​​the outlet end of the decompression hole is the actual area of ​​the outlet end of the decompression hole. Similarly, the effective areas of the outlet ends of through holes such as the sound-conducting passages and sound-tuning holes mentioned hereinafter may be defined as the product of the actual areas and the corresponding void ratios, and the explanation thereof will be omitted here.

[0103] In some embodiments, the sound output hole 421 and the first decompression hole may be located on opposite sides of the bone conduction acoustic assembly 410. In some embodiments, the housing 420 of the acoustic output device 400 may include a first side wall and a second side wall located on opposite sides of the bone conduction acoustic assembly 410, and a third side wall and a fourth side wall connected to the first side wall and the second side wall and spaced apart from each other, and the sound output hole 421 and the first decompression hole may be located on the first side wall and the second side wall, respectively, and the second decompression hole may be located on the third side wall or the fourth side wall. In some embodiments, the at least one decompression hole may further include a third decompression hole, and the effective area of ​​the outlet end of the second decompression hole is larger than the effective area of ​​the outlet end of the third decompression hole, and the second decompression hole and the third decompression hole are located on the third side wall and the fourth side wall, respectively. In some embodiments, the actual area of ​​the outlet end of the first pressure reduction hole is greater than the actual area of ​​the outlet end of the second pressure reduction hole, and the actual area of ​​the outlet end of the second pressure reduction hole is greater than the actual area of ​​the outlet end of the third pressure reduction hole.

[0104] In some embodiments, the vibrating membrane 431 is not connected to the bone conduction acoustic assembly 410, and the peripheral side is directly physically connected to the inner wall of the housing 420, and the cavity inside the housing 420 may be further divided into a first cavity 423 and a second cavity 424. In some embodiments, the number of the vibrating membranes 431 may be multiple, for example, two or three, and the multiple vibrating membranes may be physically connected to the magnetic circuit system 411 of the bone conduction acoustic assembly 410, and the cavity inside the housing 420 may be divided into a first cavity 423 and a second cavity 424. In the case where there are two vibrating membranes 431, reference may be made to FIG. 20B and FIG. 20C, and the description will be omitted here.

[0105] FIG. 6 is a schematic diagram of an acoustic output device according to some other embodiments of the present application. The acoustic output device 600 may be the same as or similar to the acoustic output device 400 in FIG. 4. For example, the acoustic output device 600 may include a bone conduction acoustic assembly 610, a housing 620, and an air conduction acoustic assembly. As another example, the bone conduction acoustic assembly 610 may include a magnetic circuit system 611, one or more diaphragms 612, and a voice coil 613. The air conduction acoustic assembly may include a vibrating membrane 631. In some embodiments, the sound emission hole 621 may be disposed in the housing 620 and communicate with the second cavity 624, and the decompression hole 622 may be disposed in the housing 620 and communicate with the first cavity 623. More description of the assemblies in the acoustic output device 600 can be found elsewhere in the present application, for example, in FIG. 4 and its related description.

[0106] As shown in FIG. 6, unlike the sound output device 400, the sound output device 600 may further include a sound guide member 640 connected to the housing 620. A sound guide passage is provided in the sound guide member 640, and the sound guide passage may be coupled to the sound output hole 621 and communicate with the sound output hole 621. In some embodiments, the sound guide passage may guide the air-conducted sound wave to the outside of the sound output device 600. In some embodiments, the sound guide member 640 may change the propagation path and / or direction of the above-mentioned air-conducted sound wave, and further change the directivity of the air-conducted sound wave. In some embodiments, the sound guide member 640 may shorten the distance between the sound output hole 621 and the human ear, and further increase the intensity of the air-conducted sound wave. When a user wears the sound output device 600, the end of the sound guide passage of the sound guide member 640 away from the sound output hole 621 may face the user's ear. In addition, the sound-guiding member 640 may move the actual output position of the air-conducted sound waves from the acoustic output device 600 away from the bottom wall of the housing 620 (i.e., the rear end surface facing the skin contact area on the housing 620 (e.g., the end surface of the housing 620 corresponding to the second cavity 624)) so as to improve anti-phase cancellation of sounds at the sound output hole 621 due to possible sound leakage at the bottom wall. In this way, the user can hear the air-conducted sound waves better when wearing the acoustic output device 600.

[0107] In some embodiments, in order to ensure sound quality, the frequency response curve of the sound output device 600 should be flat in a wide frequency band, i.e., the resonance peak should be located at a higher frequency position as much as possible. The frequency response curve of the air-conducted sound wave outputted to the outside of the sound output device 600 through the sound output hole 621 has a resonance peak, and the peak resonance frequency of the resonance peak may be 1 kHz or more. Preferably, the peak resonance frequency may be 2 kHz or more so that the sound output device 600 has a high sound output effect. More preferably, the peak resonance frequency may be 3.5 kHz or more so that the sound output device 600 has a high sound output effect. More preferably, the peak resonance frequency may be 4.5 kHz or more.

[0108] In order to improve the peak resonance frequency of the sound output device 600, in some embodiments, the sound conducting passage can communicate with the second cavity 624 through the sound output hole 621 to form a Helmholtz resonant cavity structure. The resonance frequency f of the Helmholtz resonant cavity structure and the structural parameters of the second cavity 624 and the sound conducting passage can satisfy the relational expression (2).

[0109] f∝[S / (VL+1.7VR)]1 / 2 (2)

[0110] In the formula, V is the volume of the second cavity 624, S is the cross-sectional area of ​​the sound-conducting passage, R is the equivalent radius of the sound-conducting passage, and L is the length of the sound-conducting passage. The equivalent radius is the radius of a circle that is the same as the area of ​​the sound-conducting passage when the shape of the sound-conducting passage is approximately circular or non-circular. As can be seen from the relation (2), when the volume of the second cavity 624 is constant, the resonant frequency can be increased and the air-conducted sound waves can be moved to higher frequencies by increasing the cross-sectional area of ​​the sound-conducting passage and / or decreasing the length of the sound-conducting passage.

[0111] In some embodiments, the length of the sound conducting passage may be 7 mm or less. In some embodiments, the length of the sound conducting passage may be 6 mm or less. Preferably, the length of the sound conducting passage may be between 2 mm and 5 mm.

[0112] In some embodiments, in the vibration direction of the bone conduction acoustic assembly 610, the distance from the exit end of the sound conducting passage to the inner wall (the inner surface of the top wall) away from the skin contact area of ​​the housing 620 may be 3 mm or more to avoid anti-phase cancellation of air-conducted sound waves at the exit end of the sound conducting passage due to sound leakage caused by the bottom wall of the housing 620 (i.e., the end face of the housing 620 corresponding to the second cavity 624).

[0113] In some embodiments, the cross-sectional area of ​​the sound conducting passage is 4.8 mm 2 Preferably, the cross-sectional area of ​​the sound conducting passage is 8 mm 2In some embodiments, the cross-sectional area of ​​the sound-conducting passage may be gradually increased along the extension direction (i.e., the direction of propagation of the air-conducted sound waves (i.e., the direction away from the sound emission hole 621)) so that the sound-conducting passage may be horn-shaped to easily guide the air-conducted sound waves. In some embodiments, the cross-sectional area of ​​the inlet end of the sound-conducting passage may be 10 mm 2 In some embodiments, the cross-sectional area of ​​the outlet end of the sound conducting passage is 15 mm 2 In some embodiments, the length of the sound conducting passage may be 2.5 mm, and the cross-sectional areas of the inlet and outlet ends of the sound conducting passage may be 15 mm or more. 2 and 25.3mm 2 In some embodiments, the ratio of the volume of the sound-guiding passage to the volume of the second cavity 624 may be 0.05 to 0.9. The volume of the second cavity 624 may be 400 mm3 or less. Preferably, the volume of the second cavity 624 may be 200 mm3 to 400 mm3. Furthermore, the volume of the second cavity 624 may be 350 mm3. For a detailed description of the sound-guiding member, please refer to Figs. 7A to 7E.

[0114] FIG. 7A is an exemplary structural diagram of a sound-guiding member according to some embodiments of the present application. FIG. 7B is an exemplary structural diagram of a sound-guiding member according to some embodiments of the present application. FIG. 7C is an exemplary structural diagram of a sound-guiding member according to some embodiments of the present application. FIG. 7D is an exemplary structural diagram of a sound-guiding member according to some embodiments of the present application. FIG. 7E is an exemplary structural diagram of a sound-guiding member according to some embodiments of the present application. As shown in FIGS. 7A to 7E, various structural modifications of the sound-guiding member are shown, and the main difference between them is the specific structure of the sound-guiding passage 741. In some embodiments, as shown in FIGS. 7A to 7C, the sound-guiding passage 741 may be set in a curved manner. In some embodiments, as shown in FIGS. 7D and 7E, the sound-guiding passage 741 may be set in a straight manner. As shown in FIGS. 7A to 7E, there are certain differences in the air-conducted sound waves (e.g., frequency response, transmission path) according to the difference in the structure of the sound-guiding passage 741. In addition, the sound guide passage 741 set in a curved manner may be a straight curve (for example, a right-angle curve) as shown in Figures 7A to 7C. In some embodiments, the sound guide passage set in a curved manner may be a curved curve, for example, an arc-shaped curve.

[0115] In some embodiments, as shown in Fig. 7A, the sound emitting direction of the sound conducting passage 741 is directed toward the user's face, and the distance from the outlet end of the sound conducting passage 741 to the rear end surface of the housing 720 is increased, so that the directivity and intensity of the air-conducted sound waves can be further optimized. Specifically, the outlet end of the sound conducting passage 741 is located at the tip of the sound conducting passage 741 shown in Fig. 7A (the end surface indicated by b in Fig. 7), and when the user wears the sound output device, the tip of the sound conducting passage 741 is directed toward the user's face. In some embodiments, as shown in Fig. 7B, the sound emitting direction of the sound conducting passage 741 is directed toward the user's auricle, so that the air-conducted sound waves can easily enter the ear canal through the auricle, and the intensity of the air-conducted sound waves can be further optimized. Specifically, the outlet end of the sound conducting passage 741 is located on the side wall of the sound conducting passage 741 away from the housing 720 shown in FIG. 7B, and when the user wears the sound output device, the outlet end of the sound conducting passage 741 is directed to the user's auricle. In some embodiments, as shown in FIG. 7C, the sound output direction of the sound conducting passage 741 may be directed to the user's ear canal so as to optimize the intensity of the above-mentioned air-conducted sound waves. In some embodiments, the outlet end of the sound conducting passage 741 may adopt an oblique outlet manner, and the installation manner of the oblique outlet of the outlet end of the sound conducting passage in FIG. 7C can increase the cross-sectional area of ​​the sound conducting passage 741 compared with the installation manner of the outlet end of the sound conducting passage in FIG. 7A, and further helps the output of the above-mentioned air-conducted sound waves. The oblique outlet here means that the outlet end of the sound conducting passage 741 has a certain included angle (the included angle is greater than 0) with respect to the width direction of the sound conducting passage 741 (the horizontal direction of the sound conducting passage shown in FIG. 7C). When a user wears the acoustic output device shown in FIG. 7C, the outlet end of sound conducting passage 741 can be directed toward the user's ear canal.

[0116] In some embodiments, as shown in Fig. 7D, the wall surface of the sound guide passage 741 may be flat, so that the sound guide passage 741 can be easily demolded during the manufacturing process. In some embodiments, as shown in Fig. 7E, the wall surface of the sound guide passage 741 may be curved, so that acoustic impedance matching between the sound guide passage 741 and the air outside the sound output device can be achieved, and furthermore, it is helpful in outputting the air-conducted sound waves.

[0117] It should be noted that the cross-sectional area of ​​a certain point of the sound-guiding passage 741 may be the smallest area obtained when cutting the sound-guiding passage 741 through the point. In some embodiments, the straight-path sound-guiding passage may be a sound-guiding passage in which the whole of the inlet end and the outlet end of the sound-guiding passage can be observed from either one of the other. For example, referring to the straight-path sound-guiding passage shown in FIG. 7D and FIG. 7E, the length of the sound-guiding passage 741 can be calculated in the following manner. First, the geometric center (e.g., point a) of the inlet end of the sound-guiding passage 741 and the geometric center (e.g., point b) of the outlet end are determined, and then the aforementioned geometric centers are connected to form a line segment ab, and the length of the line segment ab can be regarded as the length of the sound-guiding passage 741. In some embodiments, the curved sound-guiding passage is a sound-guiding passage in which the other cannot be observed from either one of the inlet end and the outlet end of the sound-guiding passage, or only a part of the other can be observed. For example, referring to the curved sound-guiding passage 741 shown in Figures 7A to 7C, the curved sound-guiding passage can be divided into two or more straight sub-guiding passages, and the sum of the lengths of the straight sub-guiding passages can be the length of the curved sound-guiding passage. Specifically, in Figures 7A to 7C, the geometric center (e.g., points c1 and c2) of the surface where the intermediate curved portion is located is further determined, and then the aforementioned geometric center is connected to form a line segment a-c1-b (or a-c1-c2-b), and the length of the line segment can be regarded as the length of the sound-guiding passage 741.

[0118] Further, as shown in FIG. 6, in some embodiments, an acoustic impedance network may be provided at the exit end of the sound conducting passage, and the acoustic impedance network adjusts the acoustic impedance of the air-conducted sound waves outputted to the outside of the sound output device 600 through the sound output hole 621 to weaken the peak resonance frequency of the air-conducted sound waves in the mid-high frequency band or high frequency band, so that the frequency response curve becomes smoother. In some embodiments, the acoustic impedance network provided at the exit end of the sound conducting passage can partition the second cavity 624 from the outside of the sound output device 600 to a certain extent, thereby improving the waterproof and dustproof performance of the sound output device 600. The acoustic impedance of the acoustic impedance network provided at the exit end of the sound conducting passage may be 400 MKS rayls or less. In some embodiments, the acoustic impedance of the acoustic impedance network provided at the exit end of the sound conducting passage may be 350 MKS rayls or less. In some embodiments, the acoustic impedance of the acoustic impedance network provided at the exit end of the sound conducting passage may be 260 MKS rayls or less. In some embodiments, the acoustic impedance network disposed at the outlet end of the sound-conducting passage may have an acoustic impedance of 150 MKS rayls or less. In some embodiments, the porosity of the acoustic impedance network may be 7% or more. In some embodiments, the porosity of the acoustic impedance network may be 13% or more. In some embodiments, the porosity of the acoustic impedance network may be 18% or more. In some embodiments, the size of the gaps in the acoustic impedance network may be 10 μm or more. In some embodiments, the size of the gaps in the acoustic impedance network may be 18 μm or more. In some embodiments, the size of the gaps in the acoustic impedance network may be 25 μm or more.

[0119] FIG. 8 is a plan view showing the structure of an acoustic impedance network according to some embodiments of the present application. As shown in FIG. 8, in some embodiments, the acoustic impedance network may be woven with filaments, and the parameters of the filaments (e.g., wire diameter, density, etc.) may affect the acoustic impedance of the acoustic impedance network. In some embodiments, a gap may be formed by being surrounded by four mutually intersecting filaments among the plurality of filaments arranged at intervals in the vertical direction and the plurality of filaments arranged at intervals in the horizontal direction. The area of ​​the region surrounded by the center lines of the four filaments may be defined as S1, the area of ​​the region actually surrounded by the inner edges of the four filaments (i.e., the gap) may be defined as S2, and the void ratio may be defined as S2 / S1. In some embodiments, the size of the gap may be expressed as the distance between any two adjacent filaments arranged in the vertical direction or the horizontal direction, for example, the side length of the gap.

[0120] Furthermore, the effective area of ​​a specific through hole or opening introduced in the present application may be defined as the product of its actual area and the porosity of the covered acoustic impedance network. For example, when an acoustic impedance network is covered at the outlet end of the sound-guiding passage 741, the effective area of ​​the outlet end of the sound-guiding passage 741 is the product of the actual area of ​​the outlet end of the sound-guiding passage 741 and the porosity of the acoustic impedance network, and when an acoustic impedance network is not covered at the outlet end of the sound-guiding passage 741, the effective area of ​​the outlet end of the sound-guiding passage 741 is the actual area of ​​the outlet end of the sound-guiding passage 741. Similarly, the effective areas of the outlet ends of through holes such as the decompression holes and the sound adjustment holes mentioned later may be defined as the product of the actual area and the corresponding porosity, and the description thereof will be omitted here.

[0121] In addition to bone-conducted sound waves, the user hears mainly air-conducted sound waves output to the outside of the audio output device 600 via the sound emission hole 621 and the sound conducting passage, rather than air-conducted sound waves output to the outside of the audio output device 600 via the decompression hole 622. In order for the user to hear the air-conducted sound waves output through the sound conducting passage in the audio output device 600, in some embodiments, the effective area of ​​the outlet end of the sound conducting passage may be larger than the effective area of ​​the outlet end of the decompression hole 622.

[0122] In some embodiments, the size of the decompression hole 622 affects the smoothness of exhaust of the first cavity 623 and the difficulty of vibration of the diaphragm 613, and further affects the acoustic expressiveness of the air-conducted sound waves output to the outside of the sound output device 600 through the sound output hole 621. Therefore, when the effective area of ​​the outlet end of the sound-conducting passage is constant (e.g., the actual area of ​​the outlet end of the sound-conducting passage and / or the porosity of the acoustic impedance network are constant), the effective area of ​​the outlet end of the decompression hole 622 can be adjusted (e.g., the actual area of ​​the outlet end of the decompression hole 622 and / or the acoustic impedance of the acoustic impedance network covered therewith) to change the air-conducted sound waves output to the outside of the sound output device 600 through the sound output hole 621. In some embodiments, as the actual area of ​​the outlet end of the decompression hole 622 increases, the exhaust of the first cavity 623 becomes smoother, and the peak resonance strength in the low frequency band or the low-mid frequency band is improved. In some embodiments, the exhaust of the first cavity 623 is affected by the addition of an acoustic impedance network at the outlet end of the decompression hole 622, so that the air-conducted sound waves outputted to the outside of the acoustic output device 600 through the sound output hole 621 are reduced in low to mid frequencies (e.g., 100 Hz to 200 Hz), and the frequency response curve at low to mid frequencies becomes relatively flat. In some embodiments, the sound leakage at the decompression hole may be weakened with an increase in the actual area of ​​the outlet end of the decompression hole and an increase in the acoustic impedance of the acoustic impedance network.

[0123] For example, Fig. 9 is a schematic diagram of frequency response curves of air-conducted sound waves in sound-conducting members of different arrangements of an acoustic output device according to some embodiments of the present application. As shown in Fig. 9, the frequency response curve 9-1 has an actual area of ​​31.57 mm 2 The frequency response curve 9-2 is a frequency response curve of a sound-conducting member of an acoustic output device including a pressure reduction hole that is not covered by an acoustic impedance network. The actual area of ​​the frequency response curve 9-2 is 2.76 mm 2 The frequency response curve 9-3 is a frequency response curve of a sound-conducting member of an acoustic output device including a pressure reduction hole that is not covered by an acoustic impedance network. The actual area of ​​the frequency response curve 9-3 is 2.76 mm 2 1 is a frequency response curve of a sound-guiding member of an acoustic output device including a pressure reduction hole covered with an acoustic impedance network having an acoustic impedance of 1000 MKS rays and a void ratio of 3%.

[0124] As shown in FIG. 9, the actual area of ​​the pressure reduction hole of the corresponding frequency response curve of frequency response curve 9-1 is the largest, and frequency response curve 9-1 has the largest peak resonance intensity (e.g., 98 dB) in the corresponding low frequency band or mid-low frequency band (e.g., 100 Hz to 200 Hz) compared to frequency response curve 9-2 and frequency response curve 9-3. As the actual area of ​​the outlet end of pressure reduction hole 622 increases, exhaust from first cavity 623 becomes smoother, and the peak resonance intensity in the low frequency band or mid-low frequency band is improved. In the frequency response curve 9-3, the acoustic impedance of the corresponding acoustic impedance network is the largest, the frequency response curve 9-3 has the smallest peak resonance intensity in the corresponding low frequency band or mid-low frequency band compared to the frequency response curves 9-1 and 9-2, and the frequency response curve 9-3 is flatter in the low frequency band or mid-low frequency band compared to the frequency response curves 9-1 and 9-2. Since the exhaust of the first cavity 623 is affected by the addition of an acoustic impedance network to the outlet end of the pressure reduction hole 622, the air-conducted sound waves output to the outside of the acoustic output device 600 through the sound emission hole 621 decrease at mid-low frequencies (e.g., 100 Hz to 200 Hz), and the frequency response curve at mid-low frequencies becomes relatively flat.

[0125] 10 is a schematic diagram of a frequency response curve of an air-conducted sound wave outputted to the outside of the sound output device through a sound output hole according to some embodiments of the present application. As shown in FIG. 10, a frequency response curve 10-1 has an actual area of ​​2.76 mm 2 The frequency response curve 10-2 is a frequency response curve at a sound output hole of an acoustic output device including a pressure reduction hole that is not covered by an acoustic impedance network. The actual area of ​​the frequency response curve 10-2 is 31.57 mm 2 The frequency response curve 10-3 is a frequency response curve at a sound output hole of an acoustic output device including a pressure reduction hole covered with an acoustic impedance mesh having an acoustic impedance of 145 MKS rays and a porosity of 14%. 2 10-3 is a frequency response curve of the sound output hole of the sound output device including a decompression hole covered with an acoustic impedance net having an acoustic impedance of 290 MKS rays and a porosity of 7%. As shown in Fig. 10, the larger the actual area of ​​the decompression hole of the corresponding frequency response curve of the frequency response curve 10-3, the larger the acoustic impedance of the corresponding acoustic impedance net, so that the effective area of ​​the outlet end of the decompression hole is almost the same, so that the smoothness of exhaust at each decompression hole with different actual areas communicating with the first cavity is almost the same, and further, the flatness of the frequency response curve of the air-conducted sound wave output to the outside of the sound output device through the sound output hole is almost the same in the entire frequency band for the sound output device with the decompression holes having different actual areas.

[0126] 11 is a schematic diagram of a frequency response curve of an air-conducted sound wave outputted to the outside of the sound output device through a decompression hole according to some embodiments of the present application. As shown in FIG. 11, the frequency response curve 11-1 has an actual area of ​​2.76 mm 2 The frequency response curve 11-2 is a frequency response curve at a pressure reduction hole of an acoustic output device including a pressure reduction hole not covered by an acoustic impedance network. 2The frequency response curve 11-3 is a frequency response curve of a pressure reduction hole of an acoustic output device including a pressure reduction hole covered with an acoustic impedance mesh having an acoustic impedance of 145 MKS rays and a porosity of 14%. 2 11 is a frequency response curve at the decompression hole of an acoustic output device including a decompression hole covered with an acoustic impedance network having an acoustic impedance of 290 MKS rayls and a porosity of 7%. In some embodiments, it may be understood that the frequency response curves of the air-conducted sound waves output to the outside of the acoustic output device through the sound output hole of an acoustic output device having different decompression holes are almost the same, but the frequency response curves of the air-conducted sound waves output to the outside of the acoustic output device through different decompression holes are different, and the sound leakage at each decompression hole is different. As shown in FIG. 11, the frequency response curves corresponding to the actual areas of the decompression holes from large to small are, in order, frequency response curve 11-3, frequency response curve 11-2, and frequency response curve 11-1, and correspondingly, the frequency response curves of the frequency response curve 11-3, frequency response curve 11-2, and frequency response curve 11-1 move downward as a whole. As can be seen from Fig. 11, with an increase in the actual area of ​​the outlet end of the decompression hole and an increase in the acoustic impedance of the acoustic impedance network, the frequency response curve of the air-conducted sound wave outputted to the outside of the acoustic output device through the decompression hole generally shifts downward. It may be understood that the strength of the sound leakage through the decompression hole weakens with an increase in the actual area of ​​the outlet end of the decompression hole and an increase in the acoustic impedance of the acoustic impedance network.

[0127] For example, by increasing the size of the decompression hole, the resonance peak value (Helmholtz resonance) of the first cavity of the housing can correspond to a higher frequency, and thus the sound leakage at low and mid frequencies propagating from the decompression hole can be suppressed. In some embodiments, the larger the size of the decompression hole, the smaller the acoustic impedance, and the smaller the sound pressure value of the air-conducted sound wave generated at the decompression hole, thereby reducing the sound leakage at the decompression hole. In some embodiments, when ensuring that the frequency response curve of the air-conducted sound wave in the sound-guiding member remains almost unchanged, the size (i.e., the actual area) of the decompression hole can be increased and / or the acoustic impedance of the acoustic impedance network at the decompression hole can be increased to minimize the sound leakage at the decompression hole. In some embodiments, the effective area of ​​the outlet end of the decompression hole is 2.76 mm 2 On the premise of ensuring that: ≦0.05, the sound leakage at the decompression hole can be reduced by increasing the actual area of ​​the outlet end of the decompression hole and the porosity of the acoustic impedance network.

[0128] It should be noted that, since the size of the housing 620 is limited, a single decompression hole 622 cannot be very large. Based on this, at least one or at least two, for example, three, decompression holes 622 may be provided.

[0129] Based on the above detailed description, the effective area of ​​the outlet end of the sound conducting passage may be larger than the effective area of ​​the outlet end of each decompression hole 622 so that the user can hear the air-conducted sound waves outputted to the outside of the sound output device 600 through the sound emission hole 621. Based on the definition of the effective area, the actual area of ​​the outlet end of the sound conducting passage may be larger than the actual area of ​​the outlet end of each decompression hole 622. Furthermore, the effective area of ​​the outlet end of the sound conducting passage may be equal to or larger than the sum of the effective areas of the outlet ends of all the decompression holes 622. Preferably, the ratio of the sum of the effective areas of the outlet ends of all the decompression holes 622 to the effective area of ​​the outlet end of the sound conducting passage may be equal to or larger than 0.08. In some embodiments, the ratio of the sum of the effective areas of the outlet ends of all the decompression holes 622 to the effective area of ​​the outlet end of the sound conducting passage may be equal to or larger than 0.15. In some embodiments, the ratio of the sum of the effective areas of the outlet ends of all the decompression holes 622 to the effective area of ​​the outlet end of the sound conducting passage may be equal to or larger than 0.25. In some embodiments, the ratio of the sum of the effective areas of the outlet ends of all the decompression holes 622 to the effective area of ​​the outlet end of the sound-conducting passage may be 0.3 or more. As an illustrative example, the effective areas of the outlet ends of all the decompression holes 622 may be 2.5 mm or more in order to ensure smooth exhaust of the first cavity 623, improve the acoustic expressiveness of the air-conducted sound output to the outside of the sound output device 600 through the sound emission holes 621, and reduce sound leakage from the decompression holes 622. 2 It may be more than that.

[0130] In some embodiments, the actual area of ​​the exit end of the sound conducting passage is 4.8 mm 2 Preferably, the actual area of ​​the outlet end of the sound conducting passage is 8 mm 2 In some embodiments, the sum of the actual areas of the outlet ends of all of the vacuum holes 622 is 2.6 mm 2 In some embodiments, the sum of the actual areas of the outlet ends of all the vacuum holes 622 is 10 mm 2 If the number of the decompression holes 622 is one, the sum of the actual areas of the outlet ends of all the decompression holes 622 is the actual area of ​​the outlet end of one decompression hole 114. In some embodiments, the actual area of ​​the outlet end of the sound conducting passage is 25.3 mm 2The decompression holes 622 may be provided in three, for example, the decompression holes 622 may include a first decompression hole, a second decompression hole, and a third decompression hole, and the actual area of ​​the outlet end of each decompression hole may be 11.4 mm 2 , 8.4mm 2 , 5.8mm 2 may be also possible.

[0131] As shown in FIG. 6, in some embodiments, the housing 620 may be provided with at least one tuning hole 626, which may reduce standing waves generated during operation of the acoustic output device 600. Specifically, air-conducted sound waves (also referred to as original air-conducted sound waves) generated by the air-conducted acoustic assembly may collide with the bottom surface of the housing 620 and be reflected by the bottom surface of the housing 620 during the transmission process. The reflected air-conducted sound waves and the original air-conducted sound waves may form standing waves, causing distortion of the sound output at the sound output hole 621. In some embodiments, by arranging the tuning hole 626 in the housing 620, a part of the air-conducted sound waves can be directly output from the tuning hole 626, and a part of the reflected air-conducted sound waves can be prevented from forming standing waves with the original air-conducted sound waves. In some embodiments, the tuning hole 626 may be located on a side wall that is not adjacent to the side wall of the housing where the sound output hole 621 is located. In some embodiments, the sound adjustment holes 626 may be located in one or more side walls adjacent to the side wall in which the sound emission holes 621 are located. For example, the housing 620 may include at least four side walls that are physically connected in sequence. The sound emission holes 621 may be located in a first side wall, and the decompression holes 622 may be located in a second side wall that is not adjacent to the first side wall. The first and second side walls may be substantially parallel. The sound adjustment holes 626 may be located in the second side wall, the third side wall, the fourth side wall, etc. The third side wall and the fourth side wall may be adjacent to the first side wall. In some embodiments, the size (e.g., area) of the sound adjustment holes 626 may be greater than 1 mm. 2 ~50mm 2 In some embodiments, the size (e.g., area) of the tuning hole 626 may be 5 mm 2 ~30mm 2In some embodiments, the size (e.g., area) of the tuning hole 626 may be 10 mm 2 ~20mm 2 may be also possible.

[0132] In some embodiments, the sound adjustment hole 626 may be located on a side wall of the housing opposite to the side wall on which the sound emission hole 621 is located, and the sound adjustment hole 626 may increase the resonance frequency of the air in the second cavity 624 and / or the first cavity 623. In some embodiments, the resonance frequency of the air in the second cavity 624 and / or the first cavity 623 may be the same. In some embodiments, the resonance frequency of the air in the second cavity 624 and / or the first cavity 623 may be 4000 Hz or more, or 5000 Hz or more, etc. In some embodiments, the resonance frequency of the air in the second cavity 624 may be in the range of 5500 Hz to 6000 Hz or in the range of 4000 Hz to 6000 Hz. In some embodiments, the resonant frequency of the air in the first cavity 623 may be in the range of 4500 Hz to 5000 Hz or in the range of 4000 Hz to 5000 Hz.

[0133] In some embodiments, the tuning holes 626 may be through holes. At least one of the one or more tuning holes 626 may be covered with an acoustic impedance material (e.g., tuning cotton). In some embodiments, the acoustic impedance material may include an acoustic impedance in a range of 5 MKS rays to 500 MKS rays, or an acoustic impedance in a range of 10 MKS rays to 260 MKS rays, or an acoustic impedance in a range of 20 MKS rays to 200 MKS rays, etc.

[0134] In some embodiments, the articulation hole 626 may be provided with a damping structure (e.g., a damping net) to increase the volume of the sound output from the sound guide path and reduce the volume of the sound leakage at the articulation hole 626. The damping structure at the articulation hole 626 may be configured to improve the acoustic impedance and adjust (e.g., reduce) the amplitude of the sound wave leaking from the articulation hole 626. When the amplitude of the sound wave leaking from the articulation hole 626 and the amplitude of the sound wave leaking from the decompression hole 622 are the same or similar, the sound wave leaking from the articulation hole 626 and the sound wave leaking from the decompression hole 622 can cancel each other out, in which case the sound leakage can be reduced and the output amount of the sound output from the sound guide path can be increased. Note that in some embodiments, the number of articulation holes 626 and the number of decompression holes 622 may be the same or different.

[0135] In some embodiments, the number of the at least one tuning hole 626 may be one, for example, the at least one tuning hole 626 may include a first tuning hole, and the sound emission hole 621 and the first tuning hole are respectively disposed on the first side wall and the second side wall of the housing 620. In some embodiments, the number of the at least one tuning hole 626 may be two, for example, the at least one tuning hole 626 may further include a second tuning hole, and the second tuning hole may be disposed on the third side wall or the fourth side wall of the housing 620.

[0136] In some embodiments, the vibrating membrane 631 is not connected to the bone conduction acoustic assembly 610, and the peripheral side may be directly physically connected to the inner wall of the housing 620, and the cavity inside the housing 620 may be further divided into a first cavity 623 and a second cavity 624. In some embodiments, the number of the vibrating membranes 631 may be multiple, for example, two or three, and the multiple vibrating membranes may be physically connected to the magnetic circuit system 611 of the bone conduction acoustic assembly 610, and the cavity inside the housing 620 may be further divided into a first cavity 623 and a second cavity 624. In the case where there are two vibrating membranes 631, reference may be made to FIG. 20B and FIG. 20C, and the description will be omitted here.

[0137] FIG. 12A is a schematic diagram of a sound pressure distribution in the second cavity when a sound output device according to some embodiments of the present application does not have a sound adjustment hole. FIG. 12B is a schematic diagram of a sound pressure distribution in the second cavity when a sound adjustment hole is installed in the sound output device according to some embodiments of the present application. In some embodiments, the sound guide path communicates with the second cavity through the sound emission hole to form a typical Helmholtz resonant cavity structure and can have one or more resonant peaks. In some embodiments, the distribution of sound pressure in the second cavity during resonance of the Helmholtz resonant cavity structure can be studied. As shown in FIG. 12A and FIG. 6, a high pressure region (a darker region in FIG. 12A) away from the sound outlet hole 621 and a low pressure region (a lighter region in FIG. 12A) close to the sound outlet hole 621 may be formed in the second cavity 624, where the high pressure region is a region where the sound pressure in the second cavity is high, and the low pressure region is a region where the sound pressure in the second cavity is low. In some embodiments, when the Helmholtz resonant cavity structure resonates, a standing wave is considered to be generated in the second cavity 624. The wavelength of the standing wave corresponds to the dimension of the second cavity 624, and for example, the larger the dimension of the second cavity 624 (i.e., the longer the distance between the low pressure region and the high pressure region), the longer the wavelength of the standing wave and the lower the resonant frequency of the Helmholtz resonant cavity structure. In some embodiments, as shown in FIG. 12B, the method of destroying the high pressure area makes it impossible to reflect the sound originally reflected in the high pressure area, and further makes it impossible to form a standing wave. In this case, when the Helmholtz resonating cavity structure resonates, the high pressure area in the second cavity 624 moves inward toward the direction close to the low pressure area, shortening the wavelength of the standing wave and further improving the resonant frequency of the Helmholtz resonating cavity structure. In some embodiments, the method of destroying the high pressure area may include, but is not limited to, providing a through hole (i.e., a tuning hole 626) in the high pressure area that communicates with the second cavity 624, for example, the method of destroying the high pressure area may be providing a pipe that communicates with the outside of the sound output device 600.

[0138] 13 is a schematic diagram of a frequency response curve of an air-conducted sound wave in a sound-guiding member according to some embodiments of the present application. As shown in FIG. 13, a frequency response curve 13-1 is a frequency response curve of an air-conducted sound wave in a sound-guiding member according to some embodiments of the present application. The frequency response curve 13-2 is a frequency response curve of the sound-conducting member of the sound output device when the actual area of ​​the sound-conducting hole is 1.7 mm 2 The frequency response curve 13-3 is a frequency response curve of the sound-conducting member of the sound output device when the actual area of ​​the sound articulation hole is 2.8 mm 2 The frequency response curve 13-4 is a frequency response curve of the sound-conducting member of the sound output device when the actual area of ​​the sound articulation hole is 28.44 mm 2 6, the sound guiding member of the sound output device is located in the high pressure area in the second cavity 624, so that the high pressure area can be effectively destroyed. As merely an exemplary explanation, the sound guiding hole 626 may be located in the side wall of the housing 620 opposite to the side wall of the housing 620 where the sound emission hole 621 and the sound guiding passage are located. As shown in FIG. 13, the frequency response curves corresponding to the actual areas of the sound guiding holes 626 from large to small are, in order, frequency response curve 13-4, frequency response curve 13-3, frequency response curve 13-2, and frequency response curve 13-1. With the increase in the actual area of ​​the outlet end of the sound guiding hole, the frequency response curve of the air-conducted sound wave in the sound guiding member moves downward as a whole, that is, in the entire frequency band, the intensity of the air-conducted sound wave in the sound guiding member decreases with the increase in the actual area of ​​the outlet end of the sound guiding hole. In some embodiments, the frequency response curve of the air-conducted sound wave outputted to the outside of the acoustic output device 600 through the sound output hole 621 may have a resonance peak. When the sound adjustment hole 626 is not covered with an acoustic impedance network, the actual area of ​​the outlet end of the sound adjustment hole 626 can be adjusted to control the destruction degree of the sound adjustment hole 626 in the above-mentioned high pressure region, and further adjust the peak resonance frequency of the resonance peak.

[0139] In some embodiments, the larger the actual area of ​​the outlet end of the tuning hole 626, the more significant the destructive effect of the tuning hole 626 on the above-mentioned high pressure region, and the higher the peak resonance frequency of the resonance peak in the frequency response curve. In some embodiments, the peak resonance frequency of the resonance peak when the tuning hole 626 is in an open state may be shifted to a higher frequency than the peak resonance frequency of the resonance peak when the tuning hole 626 is in a closed state, and the shift amount may be 500 Hz or more. Preferably, the shift amount is 1 kHz or more. In some embodiments, the peak resonance frequency of the resonance peak when the tuning hole 626 is in an open state may be 2 kHz or more, so that the sound output device 600 has a high sound output effect. Preferably, the peak resonance frequency may be 3.5 kHz or more. More preferably, the peak resonance frequency may be 4.5 kHz or more. Note that the tuning hole 626 being in an open state may be a situation where the tuning hole is installed in the housing 620 and the tuning hole operates normally. Correspondingly, the sound adjustment hole 626 being in a closed state may refer to a situation in which no sound adjustment hole is provided in the housing 620 or a situation in which a sound adjustment hole is provided in the housing 620 but is closed and cannot operate normally.

[0140] It should be noted that, since the size of the housing 620 is limited, the single sound adjustment hole 626 cannot be very large. Based on this, the sound adjustment hole 626 can be set as at least one sound adjustment hole, for example, a first sound adjustment hole and a second sound adjustment hole included in the above-mentioned sound adjustment hole 626. In some embodiments, the sound adjustment hole 626 may be set in any region of the high pressure region and the low pressure region in the second cavity 624, and is not limited here.

[0141] 6 and 10, since the second cavity 624 is provided with an additional articulation hole 626, some sound leaks from the articulation hole 626 (i.e., sound leakage is formed at the articulation hole 626), and the frequency response curve of the air-conducted sound wave output to the outside of the acoustic output device 600 through the sound output hole 621 moves downward as a whole. Therefore, in some embodiments, an acoustic impedance network may be provided at the outlet end of at least some of the articulation holes 626 so that the articulation holes 626 break the high-pressure region in the second cavity 624 and at the same time, sound leakage from the articulation holes 626 is avoided as much as possible.

[0142] FIG. 14 is a schematic diagram of frequency response curves of air-conducted sound waves in a sound guide member according to some other embodiments of the present application. As shown in FIG. 14, a frequency response curve 14-1 is a frequency response curve in a sound guide member of a sound output device when no sound adjustment hole is provided. A frequency response curve 14-2 is a frequency response curve in a sound guide member of a sound output device when no acoustic impedance network is provided in the sound adjustment hole. A frequency response curve 14-3 is a frequency response curve in a sound guide member of a sound output device when the acoustic impedance network covering the sound adjustment hole has an acoustic impedance of 145 MKS rayls. As shown in FIG. 14 and FIG. 6, by adding an acoustic impedance network at the outlet end of the sound adjustment hole 626, there are no significant reflected sound waves (i.e., no standing waves) in the second cavity 624, and the high pressure area in the second cavity 624 can be moved inward. In some embodiments, by adding an acoustic impedance network to the outlet end of the articulation hole 626, it is possible to prevent sound from leaking from the articulation hole 626 to some extent, and to output more sound to the outside of the sound output device 600 through the sound output hole 621. As can be seen from Fig. 14, the peak resonance intensity in the mid-low frequency band of the frequency response curve 14-3 is stronger than the peak resonance intensity in the mid-low frequency band of the frequency response curve 14-2.

[0143] In some embodiments, by adding an acoustic impedance network at the outlet end of the tuning hole 626, the peak resonance intensity in the mid-low frequency band (e.g., 90Hz to 200Hz) of the frequency response curve can be obviously increased, and the volume of the air-conducted sound wave can be increased. The peak resonance intensity in the high frequency band (e.g., 500Hz to 1000Hz) has a certain decrease, so that the frequency response curve becomes flatter in the high frequency band, and the sound quality of the high frequency is more balanced. In some embodiments, the effective area of ​​the outlet end of the tuning hole 626 (e.g., the actual area of ​​the outlet end of the tuning hole 626 and / or the acoustic impedance of the acoustic impedance network covered thereto) can be adjusted to change the air-conducted sound wave output to the outside of the sound output device 600 through the sound output hole 621.

[0144] Based on the above description, in some embodiments, the effective area of ​​the outlet end of the first articulation hole may be greater than the effective area of ​​the outlet end of the second articulation hole. In some embodiments, the actual area of ​​the outlet end of the first articulation hole may be greater than the actual area of ​​the outlet end of the second articulation hole. In some embodiments, the actual area of ​​the outlet end of the first articulation hole is 3.8 mm 2 or more, and / or the actual area of ​​the outlet end of the second tuning hole is 2.8 mm 2 In some embodiments, the sum of the effective areas of the outlet ends of all the sound articulation holes is 1.5 mm 2 In some embodiments, the porosity of the acoustic impedance network respectively covering the outlet ends of the first and second tuning holes may be 13% or more. In some embodiments, the porosity of the acoustic impedance network respectively covering the outlet ends of the first and second tuning holes may be 16% or less.

[0145] 6, the phases of the air-conducted sound waves outputted to the outside of the acoustic output device 600 through the decompression hole 622 and the sound output hole 621 may be opposite to each other, so that the decompression hole 622 may be located away from the sound output hole 621 to avoid destructive interference between the air-conducted sound waves outputted to the outside of the acoustic output device 600 through the decompression hole 622 and the sound output hole 621. For example, the decompression hole 622 and the sound output hole 621 may be located on opposite side walls of the housing 620. In some embodiments, with respect to the sound adjustment hole 626 and the sound output hole 621, the region where the sound output hole 621 is located may be regarded as a low pressure region in the second cavity 624, and the region farthest from the region where the sound output hole 621 is located in the second cavity 624 may be regarded as a high pressure region in the second cavity 624. In some embodiments, the acoustic hole 626 is preferably located in an area of ​​high pressure within the second cavity 624 to disrupt the original high pressure area and move it to a low pressure area.

[0146] In some embodiments, the decompression holes 622 communicate with the first cavity 623 and the tuning holes 626 communicate with the second cavity 624, so that the phases of the air-conducted sound waves outputted to the outside of the acoustic output device 600 through the decompression holes 622 and the tuning holes 626 are opposite to each other, and sound leakage from the decompression holes 622 and the tuning holes 626 can be reduced by destructive interference. In some embodiments, at least some of the decompression holes 622 and at least some of the tuning holes 626 are adjacent to each other (for example, at least some of the decompression holes 622 and at least some of the tuning holes 626 may be adjacent to each other on both side walls of the housing 620), so that the air-conducted sound waves outputted to the outside of the acoustic output device 600 through the decompression holes 622 and the tuning holes 626 can destructively interfere with each other. In some embodiments, in order to better cancel out the sound leakage of the decompression hole 622 and the tuning hole 626, the spacing between the decompression hole 622 and the tuning hole 626 may be as small as possible. For example, in some embodiments, the spacing between adjacently located decompression holes 622 and tuning holes 626 may be 2 mm or less. Specifically, the minimum distance between the contours of the outlet ends of adjacently located decompression holes 622 and tuning holes 626 may be 2 mm or less.

[0147] Fig. 15 is a schematic diagram of a frequency response curve of sound leakage of an audio output device according to some embodiments of the present application. As shown in Fig. 15, a frequency response curve 15-1 is a sound leakage frequency response curve having a first peak resonant frequency f1 of 3500Hz and a second peak resonant frequency f2 of 5600Hz. A frequency response curve 15-2 is a sound leakage frequency response curve having a first peak resonant frequency f1 of 4500Hz and a second peak resonant frequency f2 of 5600Hz. A frequency response curve 15-3 is a sound leakage frequency response curve having a first peak resonant frequency f1 of 5000Hz and a second peak resonant frequency f2 of 5600Hz. 15, the frequency response curve of the air-conducted sound wave outputted to the outside of the acoustic output device 600 through the decompression hole 622 may have a first resonance peak corresponding to a first peak resonance frequency f1, and the frequency response curve of the air-conducted sound wave outputted to the outside of the acoustic output device 600 through the tuning hole 626 may have a second resonance peak corresponding to a second peak resonance frequency f2. The peak resonance frequency f1 of the first resonance peak and the peak resonance frequency f2 of the second resonance peak are each 2 kHz or more and |f1-f2| / f1≦60%. In some embodiments, as the difference between the peak resonance frequency f1 of the first resonance peak and the peak resonance frequency f2 of the second resonance peak gradually decreases, the frequency bandwidth of the sound leakage that can be reduced becomes wider (i.e., the frequency response curve becomes relatively flat), so that the sound leakage of the sound output device 600 is reduced and the effect of destructive interference of the air-conducted sound waves outputted to the outside of the sound output device 600 via the decompression hole 622 and the tuning hole 626 is enhanced. Preferably, the peak resonance frequency f1 of the first resonance peak and the peak resonance frequency f2 of the second resonance peak may be 3.5 kHz or more, and |f1-f2|≦2 kHz. This allows the air-conducted sound waves outputted to the outside of the sound output device 600 via the decompression hole 622 and the tuning hole 626 to be destructively interfered with in as high a frequency band as possible (e.g., 2 kHz to 4 kHz).

[0148] In some embodiments, a structure such as a coil holder is installed in the first cavity 623, so that the wavelength of the standing wave in the first cavity 623 is relatively long. The tuning hole 626 and the sound emission hole 621 can break the high pressure area with each other to relatively shorten the wavelength of the standing wave in the second cavity 624. Therefore, the peak resonance frequency of the first resonance peak may be smaller than the peak resonance frequency of the second resonance peak. In some embodiments, the peak resonance frequency of the first resonance peak is moved to a high frequency to be close to the peak resonance frequency of the second resonance peak, so that the air-conducted sound waves outputted to the outside of the sound output device 600 through the decompression hole 622 and the tuning hole 626, respectively, can be better destructively interfered with each other. In some embodiments, based on the Helmholtz resonant cavity structure, the effective area of ​​the outlet end of the decompression hole 622 of the adjacently installed decompression hole 622 and tuning hole 626 may be larger than the effective area of ​​the outlet end of the tuning hole 626. In some embodiments, the ratio of the effective area of ​​the outlet end of the decompression hole 622 and the effective area of ​​the outlet end of the tuning hole 626 among the adjacently arranged decompression hole 622 and the tuning hole 626 may be less than or equal to 2. As an exemplary illustration, the actual area of ​​the outlet end of the decompression hole 622 among the adjacently arranged decompression hole 622 and the tuning hole 626 may be greater than the actual area of ​​the outlet end of the tuning hole 626. In some embodiments, the outlet end of the decompression hole 622 and the outlet end of the tuning hole 626 may be covered with a first acoustic impedance network and a second acoustic impedance network, respectively, and the porosity of the first acoustic impedance network may be greater than the porosity of the second acoustic impedance network.

[0149] In some embodiments, the actual area, effective area, or acoustic impedance of the sound guide passage of the sound guide member 640 (not shown in FIG. 6 ) may be adjusted to reduce sound leakage from the sound guide hole 626. In some embodiments, the effective area of ​​the outlet end of the sound guide passage may be greater than the effective area of ​​the outlet end of each sound articulation hole communicating with the second cavity in the housing, so that the user can hear the air-conducted sound waves output to the outside of the acoustic output device through the sound output hole. In some embodiments, the actual area of ​​the outlet end of the sound guide passage may be greater than the actual area of ​​the outlet end of each sound articulation hole. In some embodiments, the effective area of ​​the outlet end of the sound guide passage may be greater than the sum of the effective areas of the outlet ends of all the sound articulation holes. In some embodiments, the ratio of the sum of the effective areas of the outlet ends of all the sound articulation holes to the effective area of ​​the outlet end of the sound guide passage may be 0.08 or more. In some embodiments, the ratio of the sum of the effective areas of the outlet ends of all the sound articulation holes to the effective area of ​​the outlet end of the sound guide passage may be 0.1 or more. In some embodiments, the ratio of the sum of the effective areas of the outlet ends of all the sound articulation holes to the effective area of ​​the outlet end of the sound conducting passage may be 0.15 or more. In some embodiments, the ratio of the sum of the effective areas of the outlet ends of all the sound articulation holes to the effective area of ​​the outlet end of the sound conducting passage may be 0.15 or more. 2 or more. When the number of tuning holes is one, the sum of the effective areas of the outlet ends of all tuning holes is the effective area of ​​the outlet end of one tuning hole. In this way, not only can the peak resonance frequency of the resonance peak of the air-conducted sound wave outputted to the outside of the sound output device through the sound emission hole be shifted to as high a frequency as possible, but also sound leakage at the tuning hole can be reduced.

[0150] FIG. 16A is a cross-sectional view of a housing of an acoustic output device according to some embodiments of the present application. FIG. 16B is a cross-sectional view of a housing of an acoustic output device according to some embodiments of the present application. FIG. 16C is a left side view of a housing of an acoustic output device according to some embodiments of the present application. FIG. 16D is a plan view of a housing of an acoustic output device according to some embodiments of the present application. In order to more intuitively represent different types of holes in the same side wall (e.g., a decompression hole and a sound adjustment hole can be located in the first side wall at the same time), FIG. 16A can be regarded as a cross-sectional view of a first cavity, and FIG. 16B can be regarded as a cross-sectional view of a second cavity.

[0151] As shown in FIGS. 16A-16D , the housing (e.g., the housing 620) may include a first side wall 6231 and a second side wall 6232 located on opposite sides of the bone conduction acoustic assembly (e.g., the bone conduction acoustic assembly 610), and a third side wall 6233 and a fourth side wall 6234 connected to the first side wall 6231 and the second side wall 6232 and spaced apart from each other. In some embodiments, the third side wall 6233 and the fourth side wall 6234 may be disposed in an arc shape such that the entire housing (e.g., the housing 620) is disposed in a track shape. In some embodiments, the first side wall 6231 may be closer to the user's ear than the second side wall 6232, and the third side wall 6233 may be closer to a fixing assembly (e.g., an ear hook, etc.) of the acoustic output device 600 than the fourth side wall 6234. In some embodiments, the sound output hole (e.g., sound output hole 621) may be disposed in the first side wall 6231 so that the user can hear the air-conducted sound waves outputted to the outside of the sound output device (e.g., sound output device 600) through the sound output hole (e.g., sound output hole 621) and the sound guide passage. In some embodiments, the first decompression hole 6221 and the first sound tuning hole 6261 may be disposed in the second side wall 6232 so as to be farther away from the sound output hole (sound output hole 621). In some embodiments, the second decompression hole 6222 and the second sound tuning hole 6262 may be disposed in one of the third side wall 6233 and the fourth side wall 6234, respectively, and the third decompression hole 6223 may be disposed in the other of the third side wall 6233 and the fourth side wall 6234.

[0152] As shown in FIG. 16A, the decompression holes (e.g., decompression holes 622) may include a first decompression hole 6221 and a second decompression hole 6222. The first decompression hole 6221 may be disposed so as to be farther away from the sound emission hole 621 (shown in FIG. 16A) than the second decompression hole 6222. At this time, the effective area of ​​the outlet end of the first decompression hole 6221 may be greater than the effective area of ​​the outlet end of the second decompression hole 6222. In this way, not only can the size of the housing (e.g., housing 620) and the exhaust demand of the first cavity (e.g., first cavity 623) be compatible, but the first decompression hole 6221, which has a relatively large exhaust volume, can be disposed as far away from the sound emission hole (e.g., sound emission hole 621) as possible, and the influence of sound leakage from the decompression hole 622 on the air-conducted sound waves at the sound emission hole (e.g., sound emission hole 621) can be reduced. Furthermore, the decompression holes 622 may further include a third decompression hole 6223, and the first decompression hole 6221 may be located farther away from the sound emission hole (e.g., the sound emission hole 621) than the third decompression hole 6223. The effective area of ​​the outlet end of the second decompression hole 6222 may be larger than the effective area of ​​the outlet end of the third decompression hole 6223. As an exemplary explanation, the sound emission hole (e.g., the sound emission hole 621) and the first decompression hole 6221 may be located on opposite sides of the bone conduction acoustic assembly 610, and the second decompression hole 6222 and the third decompression hole 6223 may be located opposite to each other and between the sound emission hole 621 and the first decompression hole 6221.

[0153] In some embodiments, an acoustic impedance network may be provided at the outlet end of at least some of the decompression holes (e.g., decompression holes 622) so as to easily adjust the effective area of ​​the outlet end of the decompression hole (e.g., decompression hole 622). This embodiment is illustratively described by taking an example in which an acoustic impedance network with the same acoustic impedance is provided at the outlet end of the decompression hole (e.g., decompression hole 622). Based on this, the actual area of ​​the outlet end of the decompression hole (e.g., decompression hole 622) can be adjusted to obtain a corresponding effective area. For example, in some embodiments, the actual area of ​​the outlet end of the first decompression hole 6221 may be larger than the actual area of ​​the outlet end of the second decompression hole 6222, and the actual area of ​​the outlet end of the second decompression hole 6222 may be larger than the actual area of ​​the outlet end of the third decompression hole 6223.

[0154] As shown in FIG. 16B, the tuning hole (e.g., tuning hole 626) may include a first tuning hole 6261 and a second tuning hole 6262. The first tuning hole 6261 may be located farther away from the sound output hole (e.g., sound output hole 621) than the second tuning hole 6262. In some embodiments, the effective area of ​​the outlet end of the first tuning hole 6261 may be larger than the effective area of ​​the outlet end of the second tuning hole 6262 so as to break the high pressure area in the second cavity 624. In this way, the size of the housing 620 and the demand that the tuning hole 626 breaks the high pressure area in the second cavity 624 can be both achieved, and the resonant frequency of the air-conducted sound wave at the sound output hole (e.g., sound output hole 621) can be made as high as possible, and the first tuning hole 6261, which has a relatively high degree of destruction, can be made as far away from the sound output hole (e.g., sound output hole 621) as possible. Simply by way of illustrative example, in some embodiments, the sound emission hole (e.g., sound emission hole 621) and the first sound articulation hole 6261 may be located on opposite sides of the bone conduction acoustic assembly 610, and the second sound articulation hole 6262 may be located between the sound emission hole (e.g., sound emission hole 621) and the first sound articulation hole 6261.

[0155] In some embodiments, an acoustic impedance network may be provided at the outlet end of at least some of the tuning holes (e.g., tuning hole 626) to adjust the effective area of ​​the outlet end of the tuning hole (e.g., tuning hole 626). This embodiment will be described by taking an example in which an acoustic impedance network with the same acoustic impedance is provided at the outlet end of the tuning hole (e.g., tuning hole 626). Based on this, the actual area of ​​the outlet end of the tuning hole (e.g., tuning hole 626) can be adjusted to obtain a corresponding effective area. For example, in some embodiments, the actual area of ​​the outlet end of the first tuning hole 6261 may be larger than the actual area of ​​the outlet end of the second tuning hole 6262. Specifically, the actual area of ​​the outlet end of the first tuning hole 6261 is 3.8 mm 2 or more, and / or the actual area of ​​the outlet end of the second tuning hole 6262 is 2.8 mm 2 It may be more than that.

[0156] 16C and 16D, the first decompression hole 6221 and the first tuning hole 6261 may be disposed adjacent to each other, and the second decompression hole 6222 and the second tuning hole 6262 may be disposed adjacent to each other. In this manner, the air-conducted sound waves outputted to the outside of the audio output device 600 through the first decompression hole 6221 and the first tuning hole 6261, respectively, can be interfered with and cancelled out, and the air-conducted sound waves outputted to the outside of the audio output device 600 through the second decompression hole 6222 and the second tuning hole 6262, respectively, can also be interfered with and cancelled out.

[0157] In some embodiments, the effective area of ​​the outlet end of the first decompression hole 6221 may be larger than the effective area of ​​the outlet end of the first tuning hole 6261, so that the peak resonance frequency of the air-conducted sound wave outputted to the outside of the sound output device through the first decompression hole 6221 is shifted to a higher frequency as possible, and is as close as possible to the peak resonance frequency of the air-conducted sound wave outputted to the outside of the sound output device through the first decompression hole 6221 and the first tuning hole 6261, respectively, so that the interference of the air-conducted sound waves outputted to the outside of the sound output device through the first decompression hole 6221 and the first tuning hole 6261 can be better cancelled out. Similarly, the effective area of ​​the outlet end of the second decompression hole 6222 may be larger than the effective area of ​​the outlet end of the second tuning hole 6262, which will not be described here.

[0158] In some embodiments, similar to the articulation hole (e.g., articulation hole 626) destroying the high pressure region in the second cavity (e.g., second cavity 624), the second decompression hole 6222 and the third decompression hole 6223 destroy the high pressure region in the first cavity (e.g., first cavity 623), so that the wavelength of the standing wave in the first cavity (e.g., first cavity 623) is reduced, and the peak resonance frequency of the air-conducted sound wave outputted to the outside of the sound output device through the first decompression hole 6221 is shifted to a higher frequency to better interfere and cancel with the air-conducted sound wave outputted to the outside of the sound output device through the first articulation hole 6261. The shift amount may be 500 Hz or more, and the peak resonance frequency of the resonance peak may be 2 kHz or more. Preferably, the shift amount may be 1 kHz or more. Similarly, the peak resonance frequency of the air-conducted sound wave outputted to the outside of the sound output device through the second decompression hole 6222 can also move to a higher frequency. In short, the frequency response curve of the air-conducted sound wave outputted to the outside of the sound output device 600 through the decompression hole 622 installed adjacent to the tuning hole (e.g., the tuning hole 626) has a resonance peak, and the peak resonance frequency of the resonance peak when the other decompression holes (e.g., the decompression hole 622) other than the decompression hole (e.g., the decompression hole 622) installed adjacent to the tuning hole (e.g., the tuning hole 626) are in an open state moves to a higher frequency than the peak resonance frequency of the resonance peak when the other decompression holes 622 are in a closed state. The peak resonance frequency of the resonance peak when the other decompression holes (e.g., the decompression hole 622) are in an open state may be 2 kHz or more. Note that the decompression hole 622 being in an open state may be a situation in which a decompression hole is installed in the housing 620 and the decompression hole operates normally. Correspondingly, the decompression hole 622 being in a closed state may refer to a situation in which no decompression hole is provided in the housing 620 or a situation in which a decompression hole is provided in the housing 620 but is closed and cannot operate normally.

[0159] In addition, the present application does not limit the number, size, shape and / or position of the one or more additional acoustic structures (e.g., sound emission hole, sound guide passage, decompression hole, sound tuning hole, etc.). In some embodiments, the number, size, shape and / or position of the one or more additional acoustic structures may be optimized according to sound leakage of the acoustic output device. In some embodiments, the optimization method may be performed based on the frequency response curve of the acoustic output device according to the present specification. Also, in the present specification, the spatial arrangement of one or more members of the bone conduction acoustic assembly and the air conduction acoustic assembly and / or the air conduction acoustic assembly and the bone conduction acoustic assembly may not be limited. For example, the spatial arrangement of the bone conduction acoustic assembly and the air conduction acoustic assembly may be changed according to actual needs. As an exemplary explanation, the position of the vibration membrane in the housing in the air conduction acoustic assembly, the orientation of the vibration membrane (e.g., the direction of the front side of the housing), etc. may be changed according to actual needs and are not limited here.

[0160] FIG. 17 is a cross-sectional view showing a structure of an acoustic output device according to some embodiments of the present application. FIG. 18A is a schematic diagram of an acoustic output device according to some embodiments of the present application. FIG. 18B is a schematic diagram of an acoustic output device according to some embodiments of the present application. As shown in FIG. 17, FIG. 18A, and FIG. 18B, a bone conduction acoustic assembly in the acoustic output device may include a coil holder 1510, a magnetic circuit assembly 1520, a coil assembly, and an elastic member 1540. In some embodiments, the elastic member 1540 may be one of a spring sheet, a spring, a rubber sheet, a silicone sheet, and the like. The central regions of the coil holder 1510 and the elastic member 1540 may be physically connected to the magnetic circuit assembly 1520, so that the magnetic circuit assembly 1520 may be suspended in the housing 1601. In some embodiments, the acoustic output device may include a vibrating membrane 1503, which is physically connected to a housing 1601 and / or a magnetic circuit assembly 1520 and divides an interior of the housing 1601 into a first cavity 1610 and a second cavity 1620. In some embodiments, a coil assembly may be connected to a coil holder 1510, the magnetic circuit assembly 1520 may form a magnetic gap 1550, and the coil assembly may be disposed in the first cavity 1610 and inserted into the magnetic gap 1550. In some embodiments, the coil assembly may be provided with a communication hole 1606 that communicates between the interior and the exterior of the coil assembly. In some embodiments, the coil assembly may include a coil 1530 and a coil holder 1510, which is connected to the coil 1530 and a housing 1601 and inserts the coil 1530 into the magnetic gap 1550, and the communication hole 1606 may be located in the coil holder 1510.

[0161] In some embodiments, the magnetic circuit assembly 1520 may include a magnetic flux conductor (e.g., a magnetic flux conductive cover 1521) and a magnetic body 1522 that cooperate to form a magnetic field. The magnetic flux conductive cover 1521 may include a bottom plate 1523 and a side plate 1524. The bottom plate 1523 and the side plate 1524 may be an integrally connected structure. In some embodiments, the magnetic body 1522 may be installed in the side plate 1524 and fixed to the bottom plate 1523, and the side of the magnetic body 1522 away from the bottom plate 1523 may be connected to the middle region of the elastic member 1540 via a connecting member 1525, and the coil 1530 may be inserted into the magnetic gap 1550 between the magnetic body 1522 and the magnetic flux conductive cover 1521. Note that the magnetic body 1522 may be a magnetic body group formed of a plurality of sub-magnetic bodies. Furthermore, a magnetic flux conducting plate (not shown) may be further provided on the side of the magnetic body 1522 away from the bottom plate 1523 .

[0162] In some embodiments, the peripheral region of the elastic member 1540 is connected to the housing 1601 such that the magnetic circuit assembly 1520 is suspended from the housing 1601 and the communication hole 1606 is located on the side of the spring sheet 1540 away from the skin contact area.

[0163] In some embodiments, the coil holder 1510 may include a body portion 1511 and a first holder portion 1512, one end of the first holder portion 1512 is connected to the body portion 1511, the coil 1530 is connected to the other end of the first holder portion 1512 remote from the body portion 1511, and the communication hole 1606 may be located at a connection point between the body portion 1511 and the first holder portion 1512. In some embodiments, the body portion 1511 may be connected to a peripheral region of the spring sheet 1540, and the body portion 1511 and the spring sheet 1540 may form an integral structure, for example, may form an integral structural member based on a metal insert injection molding process.

[0164] In some embodiments, the coil holder 1510 may further include a second holder portion 1513 connected to the main body portion 1511, the second holder portion 1513 surrounding the first holder portion 1512 and extending laterally of the main body portion 1511 in the same direction as the first holder portion 1512. The second holder portion 1513 and the main body portion 1511 may be connected together with the housing 1601 so as to improve the connection strength between the coil holder 1510 and the housing 1601. Note that the first holder portion 1512 and / or the second holder portion 1513 may be a complete structure that is continuous in the circumferential direction of the coil holder 1510 so as to improve the structural strength of the coil holder 1510, or may be a partially discontinuous structure so as to avoid other structural members.

[0165] Based on the above related description, as shown in Fig. 18A, when the bone conduction assembly vibrates, it drives the air in the first cavity 1610 to vibrate, changing the pressure in the first cavity 1610, thereby discharging the air in the first cavity 1610 through the decompression hole 1604. The discharge of the air in the first cavity 1610 needs to bypass the coil assembly, which causes the wavelength of the standing wave in the first cavity 1610 to be relatively long, as shown by the dashed arrow in Fig. 18A, and is not conducive to the peak resonance frequency of the air-conducted sound wave outputted to the outside of the acoustic output device through the decompression hole 1604 moving to a high frequency. In some embodiments, the communication hole 1606 installed in the coil assembly can directly pass through the coil assembly in the process of discharging the air in the first cavity 1610. As shown in FIG. 18B, by providing a communication hole 1606 in the coil assembly, the efficiency of exhaust of the first cavity 1610 can be improved, and in some embodiments, by providing a communication hole 1606 in the coil assembly, the wavelength of the standing wave in the first cavity 1610 can be reduced, and further, the peak resonant frequency of the air-conducted sound wave outputted to the outside of the acoustic output device via the pressure reduction hole 1604 can be shifted to a higher frequency.

[0166] Fig. 19 is a comparative schematic diagram of the frequency response curve of air-conducted sound waves at the decompression hole before the communication hole is installed and the frequency response curve of air-conducted sound waves at the decompression hole after the communication hole is installed in the sound output device according to some embodiments of the present application. As shown in Fig. 19, the dashed line shows the frequency response curve of air-conducted sound waves at the decompression hole when the communication hole (e.g., the communication hole 1606) is not installed. The solid line shows the frequency response curve of air-conducted sound waves at the decompression hole (e.g., the communication hole 1606) when the communication hole is installed. As shown in FIG. 19, FIG. 18A, and FIG. 18B, the frequency response curve of the air-conducted sound wave outputted to the outside of the sound output device through the decompression hole 1604 communicating with the first cavity 1610 in the housing 1601 may have a resonance peak, and the peak resonance frequency of the resonance peak when the communication hole 1606 is in an open state (i.e., the curve shown by the solid line in FIG. 19) may shift to a higher frequency than the peak resonance frequency of the resonance peak when the communication hole 1215 is in a closed state (i.e., the curve shown by the dashed line in FIG. 19), and the shift amount may be 500 Hz or more. In some embodiments, the peak resonance frequency of the resonance peak when the communication hole 1606 is in an open state may be 2 kHz or more. Note that the communication hole 1215 being in an open state may be a situation in which a communication hole is provided in the sound output device and the communication hole operates normally. Correspondingly, the communication hole 1215 being in a closed state may mean that no communication hole is provided in the audio output device, or that the communication hole 1215 is provided in the audio output device but is closed and cannot operate normally.

[0167] 17, 18A, and 18B, the coil assembly is installed in the first cavity 1610 and inserted into the magnetic gap 1550 of the magnetic circuit assembly 1520. The coil assembly is installed in an annular shape, and a communication hole 1606 that communicates between the inside and the outside of the coil assembly may be installed to shorten the exhaust path of air in the first cavity 1610. Preferably, the communication hole 1606 may be located in a part of the coil assembly outside the magnetic gap 1550 of the magnetic circuit assembly 1520.

[0168] 17, 18A, and 18B, the coil assembly may include a coil holder 1510 and a coil 1530 connected to the coil holder 1510, which fixes the coil 1530 to the housing 1610 and inserts the coil 1530 into the magnetic gap 1550 of the magnetic circuit system 1520. A communication hole 1606 may be provided in the coil holder 1510. Furthermore, the communication hole 1606 may be located on a side away from the skin contact area of ​​the elastic member 1540 so as to shorten the exhaust path of the air in the first cavity 1610.

[0169] As shown in FIG. 17, in some embodiments, the communication holes may be located at the connection points between the first holder part 1511 and the second holder part 1512. In such embodiments, the number of communication holes may be one or more, and the one or more communication holes may be spaced apart along the circumferential direction of the coil assembly. In some embodiments, the cross-sectional area of ​​each communication hole 1606 may be 2 mm or less. 2 As a purely illustrative example, the cross-sectional area of ​​the communication hole closest to the first decompression hole may be 3 mm 2 or more, and the cross-sectional areas of the two communication holes closest to the second and third decompression holes, respectively, are 2.5 mm 2 It may be more than that.

[0170] As shown in FIG. 17, in some embodiments, the vibrating membrane 1503 may be partially connected to the magnetic circuit system 1520, and another portion may be connected to the other end of the second holder portion 1513 remote from the main body portion 1511, and further connected to the housing 1601. In some embodiments, the vibrating membrane 1503 may include a vibrating membrane body 15031 and a reinforcing ring 15035. FIG. 20A is a structural plan view of the vibrating membrane 1503 in FIG. 17 according to some embodiments of the present application. As shown in FIG. 17 and FIG. 20A, the vibrating membrane body 15031 may include a first connecting portion 15032, a corrugated portion 15033, and a second connecting portion 15034 that are integrally connected. The first connecting portion 15032 may surround the bone conduction acoustic assembly and be connected to the bone conduction acoustic assembly. The second connecting portion 15034 may be provided around the periphery of the first connecting portion 15032 and spaced apart from the first connecting portion 15032 in a direction perpendicular to the vibration direction of the bone conduction acoustic assembly. The wrinkled portion 15033 is located in a space between the first connecting portion 15032 and the second connecting portion 15034, and connects the first connecting portion 15032 and the second connecting portion 15034. In some embodiments, the reinforcing ring 15035 is connected to the second connecting portion 15034, and the second connecting portion 15034 is connected to the housing 1610 by the reinforcing ring 15035, thereby improving the structural strength of the edge of the vibrating membrane 1503 and further improving the connection strength between the vibrating membrane 1503 and the housing 1601.

[0171] In some embodiments, the acoustic output device may include a communication passage 1560 connecting the first cavity 1610 and the second cavity 1620, which can break up high pressure areas in the first cavity 1610 and the second cavity 1620, improve the peak resonant frequency of the resonant peak, and further improve the sound quality and sound leakage of the acoustic output device.

[0172] As shown in FIG. 20A , the communication passage 1560 may include a hole array 15036 disposed on the vibrating membrane 1503, for example, the hole array 15036 may be disposed on the corrugated portion 15033. In some embodiments, at least some of the holes in the hole array 15036 and the sound emission holes 1602 may be located on opposite sides of the bone conduction acoustic assembly, respectively. In other alternative embodiments, the hole array 15036 may be disposed on both sides of the sound emission holes 1602. In some embodiments, the actual area of ​​each hole in the hole array 15036 is within 0.01 mm 2 ~0.04mm 2 It may be in.

[0173] In some embodiments, the hole array 15036 may cooperate with the acoustic articulation holes 1605 such that air-conducted sound waves outputted to the outside of the acoustic output device through the acoustic emission holes 1602 move to higher frequencies.

[0174] 20B is a schematic diagram of an acoustic output device according to some embodiments of the present application. In some embodiments, the communication passage may include a through hole 1560 disposed in the magnetic circuit assembly 1520 of the bone conduction acoustic assembly, and the through hole 1560 may penetrate the magnetic circuit system 1520 (e.g., penetrate the bottom wall of the magnetic flux conductive cover 1521) so that the first cavity 1610 and the second cavity 1620 of the acoustic output device communicate with each other. In some embodiments, the actual area of ​​the through hole 1560 is 9 mm 2 In some embodiments, the actual area of ​​the through hole 1560 may be less than 7 mm 2 In some embodiments, the actual area of ​​the through hole 1560 may be less than 5 mm 2 It may be the following.

[0175] FIG. 20C is a schematic diagram of an audio output device according to some embodiments of the present application. The audio output device shown in FIG. 20C is almost similar in structure to the audio output device shown in FIG. 20B, and the difference between the two is that in some embodiments, the communication passage may be a communication pipe 1580 installed outside the housing 1601, and the communication pipe 1580 communicates the decompression hole 1604 communicating with the first cavity 1610 and the sound adjustment hole 1605 communicating with the second cavity 1620, thereby communicating the first cavity 1610 and the second cavity 1620. In some embodiments, the communication pipe 1580 may be a tubular structure, and both ends of the tubular structure are respectively communicated with the decompression hole 1604 and the sound adjustment hole 1605. In some embodiments, the communication pipe 1580 may be another three-dimensional structure separate from the housing 1601 or integrated with the housing 1601. The three-dimensional structure has a cavity inside, which communicates with the decompression hole 1604 and the tuning hole 1605, and further realizes communication between the first cavity 1610 and the second cavity 1620. In some embodiments, at least one acoustic impedance network 1590 is further installed inside the communication tube 1580, and the acoustic impedance network 1590 may be located on a side wall of the housing 1601 that simultaneously has the decompression hole 1603 and the tuning hole 1605, or may be located on the decompression hole 1603 and the tuning hole 1605. The principle of the communication passage of the sound output device shown in Figures 20B and 20C is almost the same as the principle of the communication passage in Figure 20A, so a description will be omitted here. Note that the shape and position of the communication tube 1580 are not limited to being located on one side of the housing 1601 shown in Figure 20C, and may be adaptively adjusted according to the positions of the decompression hole 1604 and the tuning hole 1605.

[0176] The frequency response curve of the air-conducted sound wave outputted to the outside of the sound output device through the sound output hole may have a resonance peak, and the peak resonance frequency of the resonance peak may be 2 kHz or more. In some embodiments, the peak resonance frequency of the resonance peak when the communication passage is in an open state may move to a higher frequency than the peak resonance frequency of the resonance peak when the communication passage is in a closed state, and the amount of movement may be 500 Hz or more. Preferably, the amount of movement may be 1 kHz or more. In some embodiments, as the peak resonance frequency of the resonance peak moves to a higher frequency, sound leakage in the mid-low frequency band of the sound output device is gradually reduced. For example, FIG. 21 is a schematic diagram of a frequency response curve of an air-conducted sound wave in a sound guide member according to some embodiments of the present application. FIG. 22 is a schematic diagram of a frequency response curve of an air-conducted sound wave in a sound guide member according to some other embodiments of the present application. As shown in FIG. 21, a frequency response curve 21-1 shows a frequency response curve of a sound guide member of a sound output device in which a communication passage and a sound tuning hole are not provided. The frequency response curve 21-2 shows a frequency response curve in a sound guide member of a sound output device having a communication passage and no tuning hole. The frequency response curve 21-3 shows a frequency response curve in a sound guide member of a sound output device having a communication passage and a tuning hole. As shown in FIG. 22, the frequency response curve 22-1 shows a frequency response curve in a sound guide member of a sound output device having no communication passage and no tuning hole. The frequency response curve 22-2 shows a frequency response curve in a sound guide member of a sound output device having a communication passage and no tuning hole. The frequency response curve 22-3 shows a frequency response curve in a sound guide member of a sound output device having a communication passage and a tuning hole.

[0177] As shown in FIG. 21 and FIG. 22, the frequency response curve of the air-conducted sound wave outputted to the outside of the sound output device through the sound output hole may have a resonance peak, and the peak resonance frequency of the resonance peak may be 2 kHz or more. In some embodiments, the peak resonance frequency of the resonance peak when the communication passage is in an open state (for example, frequency response curve 21-2, frequency response curve 21-3) may move to a higher frequency than the peak resonance frequency of the resonance peak when the communication passage is in a closed state (for example, frequency response curve 21-1), and the amount of movement may be 500 Hz or more. Preferably, the amount of movement may be 1 kHz or more. In some embodiments, as the peak resonance frequency of the resonance peak moves to a higher frequency, sound leakage in the low and mid-frequency bands from the sound output device is gradually reduced. Note that the communication passage being in an open state may be a situation in which the communication passage is installed in the sound output device and the communication passage operates normally. Correspondingly, the communication passage being in a closed state may be a situation in which the communication passage is not installed in the sound output device or a communication passage is installed in the sound output device but is closed and cannot operate normally.

[0178] As shown in FIG. 20B, in some embodiments, an acoustic impedance network 1570 may be provided in the communication path defined by the communication passage 1560. As shown in FIG. 20B and FIG. 23, by providing the acoustic impedance network 1570 in the communication path defined by the communication passage 1560, the high frequency peak in the air-conducted sound wave outputted to the outside of the sound output device through the sound output hole 1602 and the sound guide passage is further weakened, so that the frequency response curve becomes flatter and the high frequency sound quality becomes more uniform. For example, FIG. 23 is a schematic diagram of a frequency response curve of an air-conducted sound wave in a sound guide member according to some other embodiments of the present application. As shown in FIG. 23, a frequency response curve 23-1 shows a frequency response curve in a sound guide member of a sound output device in which a communication passage is not provided. A frequency response curve 23-2 shows a frequency response curve in a sound guide member of a sound output device in which a communication passage is provided and the communication passage is not covered with an acoustic impedance network. The frequency response curve 23-3 shows a frequency response curve of a sound-guiding member of an acoustic output device in which a communication passage is provided and an acoustic impedance network covering the communication passage has an acoustic impedance of 45 MKS rayls and a porosity of 18%. The frequency response curve 23-4 shows a frequency response curve of a sound-guiding member of an acoustic output device in which a communication passage is provided and an acoustic impedance network covering the communication passage has an acoustic impedance of 260 MKS rayls and a porosity of 13%. The frequency response curve corresponding to the frequency response curve 23-4 is flatter than the frequency response curve corresponding to the frequency response curve 23-3. In some embodiments, the acoustic impedance network installed in the communication path defined by the communication passage may have a porosity of 18% or less and / or the size of the voids may be 51 μm or less.

[0179] In order to further explain the effects of the sound conducting passage, the decompression hole, and the sound articulation passage in the sound output device, only the scene when the user wears the sound output device shown in FIG. 24 will be described as an example. FIG. 24 is a schematic diagram of different positions for the sound output device according to some embodiments of the present application. As shown in FIG. 24, points P1, P2, P3, and P4 can indicate positions for the sound output device. When the user wears the sound output device, P1 is located close to the user's skin and may be called the front side of the sound output device, P3 is located away from the user's skin and may be called the rear side of the sound output device, P2 is located near the aforementioned sound conducting passage, and P4 is near the aforementioned decompression hole.

[0180] 25-29 are schematic diagrams of frequency response curves of sound leakage from an audio output device at different positions in FIG. 24 according to some embodiments of the present application. The frequency response curve of sound leakage from an audio output device may be a curve showing the change in sound leakage from the audio output device and the frequency of the audio signal. The horizontal axis may represent the frequency of the audio signal input to the audio output device. The vertical axis may represent the volume of sound leakage from the audio output device at positions (e.g., P1, P2, P3, P4). The frequency response curves L1-L4 of sound leakage show that the sound leakage from the audio output device changes with the frequency of the audio signal at positions P1-P4 in FIG. 24, as shown in FIG. 25-29, respectively.

[0181] As shown in Fig. 25, the frequency response curves of sound leakage at positions P1 to P4 in Fig. 24 of the first sound output device including a sound guide passage and a decompression hole are L1 to L4, respectively, and the sound guide passage and the decompression hole are installed on two opposing side walls of the housing of the sound output device. The first sound output device may be the same as or similar to the sound output device 600 in Fig. 6.

[0182] As shown in Fig. 26, the frequency response curves of sound leakage at positions P1 to P4 in Fig. 24 of the second audio output device including a sound guide passage and a decompression hole are L1 to L4, respectively, and the sound guide passage and the decompression hole are installed on two opposing side walls of the housing of the audio output device. The second audio output device further includes at least one pressure adjustment hole installed on the side wall where the decompression hole is located. The second audio output device may be the same as or similar to the audio output device 600 in Fig. 6.

[0183] As shown in Fig. 27, the frequency response curves of sound leakage at positions P1-P4 in Fig. 24 of the third sound output device including a sound guide passage and a decompression hole are L1-L4, respectively, and the sound guide passage and the decompression hole are installed on two opposite side walls of the housing of the sound output device. The third sound output device further includes at least one sound adjustment hole installed on the side wall where the decompression hole is located. The third sound output device may be the same as or similar to the sound output device 600 in Fig. 6. Different from the second sound output device, the volume of the second cavity of the third sound output device is smaller than the volume of the second cavity of the second sound output device.

[0184] As shown in FIG. 28, the frequency response curves of sound leakage at positions P1-P4 in FIG. 24 of the fourth sound output device including a sound guide passage and a decompression hole are L1-L4, respectively, and the sound guide passage and the decompression hole are installed on two opposing side walls of the housing of the sound output device. The fourth sound output device further includes at least one sound adjustment hole installed on the side wall where the decompression hole is located. The fourth sound output device may be the same as or similar to the sound output device 600 in FIG. 6. Unlike the second sound output device, the sound guide passage and the decompression hole may communicate with each other through the sound adjustment hole. It may be understood that the decompression hole and the sound adjustment hole are not through holes.

[0185] As shown in FIG. 29, the frequency response curves of sound leakage at positions P1 to P4 in FIG. 24 of the fifth sound output device including a sound guide passage and a first decompression hole are L1 to L4, respectively, and the sound guide passage and the first decompression hole are installed on two opposing side walls of the housing of the sound output device. The fifth sound output device further includes at least one sound adjustment hole installed on the side wall where the first decompression hole is located. The fifth sound output device may be the same as or similar to the sound output device 600 in FIG. 6. The sound guide passage and the first decompression hole communicate with each other through the sound adjustment hole. It may be understood that the first decompression hole and the sound adjustment hole are not through holes. Unlike the fourth sound output device, the fifth sound output device further includes a second decompression hole installed on the side wall where the first decompression hole is located. The second decompression hole is a through hole.

[0186] 30 to 33 are schematic diagrams of frequency response curves of sound leakage of different sound output devices at the same position in FIG. 24 according to some embodiments of the present application. The frequency response curves S1 to S5 of sound leakage show the change in sound leakage with the frequency of the sound signal at each position P1 to P4 in FIG. 24 of different sound output devices as shown in FIG. 30 to 33. As shown in FIG. 30, the frequency response curves of sound leakage at position P1 of the first sound output device, the second sound output device, the third sound output device, the fourth sound output device, and the fifth sound output device in FIG. 25 to 29 are S1 to S5, respectively. As shown in FIG. 31, the frequency response curves of sound leakage at position P2 of the first sound output device, the second sound output device, the third sound output device, the fourth sound output device, and the fifth sound output device in FIG. 25 to 29 are S1 to S5, respectively. As shown in Fig. 32, the frequency response curves of sound leakage at position P3 of the first sound output device, the second sound output device, the third sound output device, the fourth sound output device and the fifth sound output device in Figs. 25 to 29 are S1 to S5, respectively. As shown in Fig. 33, the frequency response curves of sound leakage at position P4 of the first sound output device, the second sound output device, the third sound output device, the fourth sound output device and the fifth sound output device in Figs. 25 to 29 are S1 to S5, respectively.

[0187] 25, in the frequency response curves L1-L4 of sound leakage at different positions P1-P4 of a first sound output device that does not include a tuning hole, in particular, the frequency response curve L1 of sound leakage corresponding to the front position P1 and the frequency response curve L3 of sound leakage corresponding to the rear position P3 each include a first peak with a frequency of approximately 2000 Hz and a second peak with a frequency of approximately 2200 Hz. The first peak with a frequency of approximately 2000 Hz may be caused by the first cavity of the first sound output device, and the second peak with a frequency of approximately 2200 Hz may be caused by the second cavity of the first sound output device. As shown in FIG. 26, in the frequency response curves L1 to L4 of sound leakage at different positions P1 to P4 of the second sound output device including the tuning hole, the frequency response curve L1 of sound leakage corresponding to the front position P1 and the frequency response curve L3 of sound leakage corresponding to the rear position P3 in particular each include a first peak at a frequency of about 2000 Hz and a second peak at a frequency of about 4800 Hz. Comparing the frequency response curves L1 to L4 of sound leakage of the first sound output device and the second sound output device, the tuning hole can move the second peak caused by the second cavity toward a higher frequency. Therefore, the tuning hole can increase the resonance frequency in the air in the second cavity (i.e., the peak corresponding frequency of the frequency response curves L1 to L4 of sound leakage). As shown in Figures 30 to 33, by comparing the frequency response curve S1 of sound leakage from the first sound output device with the frequency response curve S2 of sound leakage from each of the second sound output devices in Figures 30 to 33, it is possible to determine that the sound leakage at position P2 of the second sound output device (i.e., a position around the sound conducting passage) is sound leakage from the articulation hole, but the sound leakage at other positions of the second sound output device (e.g., P1, P3 and P4) does not change significantly.

[0188] As shown in FIG. 27, the frequency response curves L1 to L4 of the sound leakage of the third sound output device include a first peak and a second peak at different points P1 to P4, and the volume of the second cavity of the third sound output device is smaller than that of the second cavity of the second sound output device. Comparing the frequency response curves L1 to L4 of the sound leakage of the second sound output device and the third sound output device, it can be estimated that the second peak caused by the second cavity shown in FIG. 26 can be moved toward a higher frequency for the small volume of the second cavity shown in FIG. 27. As shown in FIG. 30 to FIG. 33, by comparing the frequency response curve S2 of the sound leakage of the second sound output device with the frequency response curve S3 of the sound leakage of the third sound output device at each position P1, P2, P3, and P4, it can be seen that the sound leakage at each position P1, P2, P3, and P4 of the third sound output device does not change depending on the volume of the second cavity.

[0189] As shown in Fig. 28, the frequency response curves L1 to L4 of the sound leakage of the fourth sound output device including the sound conducting passage, the decompression hole, and the communicating sound articulation hole may include a first peak at a frequency of about 700 Hz and a second peak at a frequency of more than 1000 Hz. Comparing the frequency response curves L1 to L4 of the sound leakage of the fourth sound output device and the fifth sound output device, it can be estimated that the first peak in Fig. 28 moves toward a lower frequency because the first cavity and the second cavity communicate with each other and the volume of the cavity increases. As shown in Figs. 30 to 33, comparing the frequency response curves S4 of the sound leakage of the fourth sound output device and the frequency response curves S5 of the sound leakage of the fifth sound output device, the sound leakage at positions P2 and P4 of the fourth sound output device (i.e., the positions of the sound conducting passage and the decompression hole) is significantly reduced, especially in low and medium frequencies.

[0190] As shown in Fig. 29, the frequency response curves L1 to L4 of sound leakage of the fifth sound output device including a sound conducting passage, a first decompression hole, a second decompression hole, and a communicating sound articulation hole may include a first peak and a second peak. When comparing the frequency response curves L1 to L4 of sound leakage of the second sound output device and the fifth sound output device, it can be estimated that the second peak in Fig. 29 moves toward a higher frequency. When comparing the frequency response curves S2 of sound leakage of the second sound output device and the frequency response curves S5 of sound leakage of the fifth sound output device as shown in Figs. 30 to 33, compared to the second sound output device, the sound leakage of the fifth sound output device does not change significantly at position P2 (i.e., around the sound conducting passage) and decreases significantly at position P4 (i.e., around the second decompression hole).

[0191] Although the basic concept has been described above, it is clear to those skilled in the art that the detailed disclosure above is merely provided as an example and does not limit the present application. Although not explicitly described herein, those skilled in the art can make various changes, improvements and modifications to the present application. These changes, improvements and modifications are intended to be suggested by the present application and therefore are within the spirit and scope of the exemplary embodiments of the present application.

[0192] Furthermore, certain terms are used herein to describe embodiments of the present application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the present application. Thus, it is emphasized and understood that references to two or more of "one embodiment" or "one embodiment" or "one alternative embodiment" in various parts of this specification do not necessarily all refer to the same embodiment. Also, certain features, structures, or characteristics in one or more embodiments of the present application may be combined as appropriate.

[0193] Moreover, as will be appreciated by those skilled in the art, aspects of the present application may be illustrated and described in several patentable classes or contexts, including any new and useful process, machine, manufacture, or combination of matter, or any new and useful improvement thereto. Thus, aspects of the present application may be implemented entirely in hardware, entirely in software (including firmware, resident software, microcode, etc.), or a combination of hardware and software. Any of the above hardware or software may be referred to as a "data block," "module," "engine," "unit," "assembly," or "system." Additionally, aspects of the present application may take the form of a computer program product embodied in one or more computer-readable medium(s) containing computer-readable program code.

[0194] The computer storage medium may include a propagated data signal, propagated on baseband or as part of a carrier wave, for carrying the computer program code. The propagated signal may include various forms, such as electromagnetic signals, optical signals, or suitable combinations. The computer storage medium may be any computer readable medium other than a computer readable storage medium, which may be connected to an instruction execution system, device, or equipment to realize the communication, propagation, or transmission of the program used. The program code on the computer storage medium may be propagated via any suitable medium, including wireless, cable, fiber optic cable, RF, or similar media, or any combination of the above-mentioned media.

[0195] Additionally, unless expressly stated in the claims, the order of enumeration of processing elements or sequences described herein, the use of alphanumeric characters, or the use of other designations, do not limit the order of procedures and methods of the present application. While the above disclosure describes through various examples what are presently believed to be various useful embodiments of the invention, it will be understood that such details are merely for the purpose of illustration and that the appended claims are not limited to the disclosed embodiments, but on the contrary are intended to cover all modifications and equivalent combinations that are within the spirit and scope of the embodiments of the present application. For example, the system assembly described above may be implemented by a hardware device, but may also be implemented as a software-only solution, for example, by installing the described system on an existing server or mobile device.

[0196] Similarly, in the foregoing description of embodiments of the present application, it will be understood that various features may be grouped together in a single embodiment, figure, or description for the purpose of simplifying the application and facilitating an understanding of one or more embodiments of the present invention. This method of disclosure, however, should not be interpreted as reflecting an intention that the claimed subject matter requires more features than are recited in each claim. In fact, an embodiment may include fewer than all features of a single embodiment disclosed above.

[0197] In some embodiments, numbers are used to describe the number of components and attributes, and the numbers describing such embodiments are to be understood to be modified in some embodiments by the modifiers "about," "approximately," or "generally." Unless otherwise specified, "about," "approximately," or "generally" indicate that the numbers are allowed to vary by ±20%. Thus, in some embodiments, all numerical parameters used in the specification and claims are approximations that may vary depending on the characteristics required for a particular embodiment. In some embodiments, the numerical parameters should be applied with the stated number of significant digits and ordinary rounding techniques. In some embodiments, the numerical ranges and parameters for determining the ranges are approximations; however, in specific embodiments, such numerical values ​​are set as precisely as possible.

[0198] All patents, patent applications, published patent applications, and other materials, such as articles, books, specifications, publications, documents, etc., referenced in this application are incorporated herein by reference in their entirety, except for prosecution history documents that are inconsistent or inconsistent with the content of this application, and documents that may have a limiting effect on the broadest scope of the claims of this application (now or later related to this application). In addition, if the explanations, definitions, and / or use of terms in the accompanying materials of this application are inconsistent or inconsistent with the content set forth in this application, the explanations, definitions, and / or use of terms in this application shall control.

[0199] Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of the embodiments of the present application. Other variations may be within the scope of the present application. Thus, by way of example, and not of limitation, alternative configurations of the embodiments of the present application may be considered consistent with the teachings of the present application. Thus, the embodiments of the present application are not limited to the embodiments expressly introduced and described herein. [Explanation of symbols]

[0200] 100 Sound Output System 110 Multimedia Platform 112 Processing equipment 120 Network 130 Audio output device 140 User terminal 150 Storage devices 200 Audio output device 210 Ear hook 211 Protective cover 212 Housing protection material 220 Housing 221 Contact surface 230 Circuit Housing 240 Back Cover 250 Acoustic Assembly 260 Control circuit 270 battery 310 Bone Conduction Acoustic Assembly 320 Air Conducted Acoustic Assembly 330 Housing 400 Audio output device 410 Bone Conduction Acoustic Assembly 411 Magnetic Circuit System 412 Diaphragm 413 Voice Coil 420 Housing 421 Sound emission hole 422 Pressure reduction hole 423 First Cavity 424 Second Cavity 431 Vibrating Membrane 600 Audio output device 610 Bone Conduction Acoustic Assembly 611 Magnetic Circuit System 612 Diaphragm 613 Voice Coil 620 Housing 621 Sound emission hole 622 Pressure reduction hole 626 Tuning hole 640 Sound conducting members 741 Sound guide passage 1503 Vibrating membrane 15031 Diaphragm body 15032 First connection 15033 wrinkles 15034 Second Connection 15035 Reinforcement ring 15036 Hole Array 1510 Coil holder 1511 Main body 1512 First holder part 1513 Second holder part 1520 Magnetic Circuit Assembly 1521 Magnetic Flux Conduction Cover 1522 Magnetic material 1523 Bottom plate 1524 Side panel 1525 Connection parts 1530 Coil 1540 Elastic member 1550 Magnetic Gap 1601 Housing 1606 Communication hole 1610 First Cavity 1620 Second Cavity 6221 First pressure reduction hole 6222 Second decompression hole 6223 Third pressure reduction hole 6231 First side wall 6232 Second side wall 6233 Third side wall 6234 4th side wall 6261 First articulation hole 6262 Second articulation hole

Claims

1. a bone conduction acoustic assembly for generating bone conduction acoustic waves; an air conduction acoustic assembly for generating air conduction sound waves; a housing for housing at least some of the elements of the bone conduction acoustic assembly and the air conduction acoustic assembly; An audio output device comprising: the housing includes a first cavity and a second cavity, the first cavity accommodates at least a portion of the bone conduction acoustic assembly, the housing has a sound emission hole communicating with the second cavity, and the air-conducted sound waves are transmitted to an outside of the acoustic output device through the sound emission hole; The frequency response curve of the air-conducted sound wave has one or more resonant peaks, and the peak resonant frequency of the resonant peaks is 1 kHz or more; The housing further has at least one decompression hole communicating with the first cavity, the at least one decompression hole including a first decompression hole and a second decompression hole, the first decompression hole is positioned farther from the sound output hole than the second decompression hole, and the effective area of ​​the outlet end of the first decompression hole is larger than the effective area of ​​the outlet end of the second decompression hole.

2. The acoustic output device of claim 1, characterized in that the housing includes a first side wall and a second side wall located on opposite sides of the bone conduction acoustic assembly, and a third side wall and a fourth side wall connected to the first side wall and the second side wall and spaced apart from each other, the sound emission hole and the first decompression hole being respectively located in the first side wall and the second side wall, and the second decompression hole being located in the third side wall or the fourth side wall.

3. The acoustic output device of claim 2, characterized in that the at least one decompression hole further includes a third decompression hole, the effective area of ​​the outlet end of the second decompression hole is larger than the effective area of ​​the outlet end of the third decompression hole, and the second decompression hole and the third decompression hole are respectively installed in the third side wall and the fourth side wall.

4. 2. The acoustic output device according to claim 1, further comprising at least one tuning hole communicating with the second cavity, wherein the housing is further provided with a peak resonance frequency of the resonance peak when the at least one tuning hole is in an open state, the peak resonance frequency of the resonance peak being shifted to a higher frequency than the peak resonance frequency of the resonance peak when the at least one tuning hole is in a closed state.

5. The acoustic output device of claim 4, characterized in that the housing includes a first side wall and a second side wall located on opposite sides of the bone conduction acoustic assembly, the at least one sound articulation hole includes a first sound articulation hole, and the sound emission hole and the first sound articulation hole are respectively located on the first side wall and the second side wall.

6. 6. The acoustic output device of claim 5, wherein the housing further includes a third side wall and a fourth side wall connected to the first side wall and the second side wall and spaced apart from each other, and the at least one sound adjustment hole further includes a second sound adjustment hole provided in the third side wall or the fourth side wall.

7. 2. The sound output device according to claim 1, further comprising a sound-guiding member connected to the housing, the sound-guiding member having a sound-guiding passage, the sound-guiding passage communicating with the sound output hole and guiding the air-conducted sound waves to the outside of the sound output device.

8. 8. The acoustic output device according to claim 7, wherein the housing is provided with a pressure reduction hole communicating with the first cavity, and the effective area of ​​the outlet end of the sound conducting passage is equal to or greater than the sum of the effective areas of the outlet ends of all the pressure reduction holes communicating with the first cavity in the housing.

9. 9. The sound output device according to claim 7, wherein the housing is provided with sound adjustment holes communicating with the second cavity, and an effective area of ​​an outlet end of the sound conducting passage is larger than an effective area of ​​an outlet end of each of the sound adjustment holes.

10. The bone conduction acoustic assembly according to any one of claims 1 to 9, characterized in that the bone conduction acoustic assembly includes a magnetic circuit system and a coil assembly, the magnetic circuit system forms a magnetic gap, the coil assembly is installed in the first cavity and inserted into the magnetic gap, and a communication hole is installed.

11. The acoustic output device according to claim 10 , wherein the communication hole is located at a portion where the coil assembly is located outside the magnetic gap.

12. The acoustic output device of claim 11, wherein the coil assembly includes a coil and a coil holder, the coil holder connects the coil and the housing so that the coil is inserted into the magnetic gap, and the communication hole is installed in the coil holder.

13. The acoustic output device of claim 1, further comprising a communicating passage connecting the first cavity and the second cavity, wherein the peak resonant frequency of the resonant peak when the communicating passage is in an open state shifts to a higher frequency than the peak resonant frequency of the resonant peak when the communicating passage is in a closed state, and the amount of shift is 500 Hz or more.

14. 14. The sound output device according to claim 13, wherein the housing further includes a decompression hole communicating with the first cavity and a sound adjustment hole communicating with the second cavity, and the communication passage is installed outside the housing and communicates the decompression hole and the sound adjustment hole.

Images