SYSTEMS, METHODS AND DEVICES FOR ACOUSTIC OUTPUT

Abstract

This disclosure provides an apparatus for outputting audio signals. The apparatus may include a bone conduction unit configured to generate a bone conduction acoustic waveform. The apparatus may also include an air-tympanic conduction unit configured to generate an air-tympanic conduction acoustic waveform; the bone conduction acoustic waveform and the air-tympanic conduction acoustic waveform may represent the same audio signal. The apparatus may include a phase difference between the bone conduction acoustic waveform and the air-tympanic conduction acoustic waveform that may be less than a threshold. The apparatus may include a housing configured to accommodate at least a portion of the bone conduction unit and the air-tympanic conduction unit.

Description

SYSTEMS, METHODS AND DEVICES FOR ACOUSTIC OUTPUT Cross-reference to related applications This application claims priority from Chinese Patent Application No. 202010247338.2, filed on March 31, 2020, the content of which is incorporated herein by reference. Field of Invention This presentation refers in general to acoustic output technology, in particular to an acoustic output device that uses both bone conduction and aerotympanic conduction to provide audio signals. Background of the Invention Currently, portable devices with audio output are emerging and becoming increasingly popular. In particular, open binaural audio output devices (e.g., bone conduction speakers) are increasingly used to facilitate sound delivery to the user due to their health and safety characteristics. However, bone conduction speakers have poor performance in the low-mid frequency range and noticeable sound leakage. Therefore, there is a need to provide an audio output device that emits sound with improved quality, enriches the sound, enhances the user's audio experience, and also reduces sound leakage. Summary of the Invention In one aspect of this display, an apparatus for outputting audio signals is provided. In some embodiments, the apparatus may include a bone conduction system configured to generate a bone conduction acoustic waveform. The apparatus may also include an aerotympanic conduction system configured to generate an aerotympanic conduction acoustic waveform; the bone conduction acoustic waveform and the aerotympanic conduction acoustic waveform may represent the same audio signal. The apparatus may include a phase difference between the bone conduction acoustic waveform and the aerotympanic conduction acoustic waveform that may be less than a threshold. - 2 The device may include a housing configured to accommodate at least a portion of the bone conduction system and the aerotympanic conduction system. In some modalities, the bone conduction system may include a magnetic circuit system configured to generate a magnetic field. The bone conduction system may include one or more vibrating plates connected to the housing. The bone conduction system may include a voice coil connected to at least one of the vibrating plates, wherein the voice coil vibrates in the magnetic field in response to the reception of the audio signal, and causes one or more vibrating plates to vibrate to generate the bone conduction acoustic waves. In some modalities, the aerotympanic conduction acoustic wave can be generated based on a vibration of at least one of the bone conduction installation or housing when the bone conduction installation generates the bone conduction acoustic wave. In some modalities, the aerotympanic conduction installation may include one or more vibration diaphragms physically connected to at least one of the bone conduction installation or housing; the aerotympanic conduction acoustic wave may be generated based on one or more vibration diaphragms and the vibration of at least one of the bone conduction installation or housing. In some modalities, the housing may include a space where at least one of the one or more vibration diaphragms is located; the space may include a first cavity and a second cavity defined by at least one of the one or more vibration diaphragms; a first portion of the housing around the first cavity may be physically connected to the bone conduction installation and configured to transfer a vibration from the bone conduction installation, and the aerotympanic conduction acoustic wave may exit from the second cavity. In some modalities, a second portion of the housing around the second cavity can be configured with one or more first holes in flow communication with the second cavity, and the aerotympanic conduction wave can exit the first holes through the one or more first holes. In some versions, a sound tube may be provided in each of the first one or more holes. iviA / a / zuzz / u ι 11 -3In some embodiments, the first portion of the housing can be configured with one or more second holes in flow communication with the first cavity, and the one or more second holes can be configured to adjust an air pressure in the first cavity. In some embodiments, the first one or more holes may be configured in a first side wall of the housing, the second one or more holes may be configured in a second side wall of the housing, and the first side wall may be substantially parallel to the second side wall. In some embodiments, the housing can be configured with one or more third holes in flow communication with at least one of the first cavity or the second cavity. In some models, at least one of the one or more second holes or one or more third holes may be covered by an acoustic resistance material. In some models, at least one of the one or more third holes can be configured in the second side wall of the housing. In some models, at least one of the one or more third holes can be configured with a shock-absorbing structure. In some modalities, at least one of the one or more vibration diaphragms may include a main portion physically connected to the bone conduction installation; the main portion may include a base plate and a side wall formed as a subspace to house at least a portion of the bone conduction installation; and an auxiliary portion may be physically connected to the housing. In some modalities, the auxiliary portion may include at least one of a concave area or a convex area. In some modalities, at least one of the one or more vibration diaphragms may include an annular structure, an inner wall of the vibration diaphragm may surround the bone conduction installation, and an outer wall of the vibration diaphragm may be physically connected to the housing. In some modalities, at least one of the one or more vibration diaphragms may be located between a lower surface of the bone conduction installation and the lower surface of the housing. In some configurations, one or more vibration diaphragms may include a first vibration diaphragm physically connected to the installation of MA / a / ZUZZ / UI 11 / Z -4 bone conduction and a second vibration diaphragm can be physically connected to the housing. In some embodiments, a lower surface of the housing that may be opposite a side wall of the housing that makes contact with a user when the user is wearing the device includes a resonance frequency below a threshold. In some modalities, the aerotympanic conduction installation may include a vibration diaphragm and a vibration transmission installation; the vibration transmission installation may be physically connected to the bone conduction installation and the vibration diaphragm, and the vibration transmission installation may be configured to transfer the vibration from the bone conduction installation to the vibration diaphragm to generate the aerotympanic conduction acoustic wave. In some models, the device may also include a sound hole; the aerotympanic conduction wave may exit the sound hole, and the vibrating diaphragm may be arranged in the sound hole. The additional features will be partly explained in the following description, and partly will be evident to those skilled in the art upon examining the accompanying drawings, or can be learned through the production or operation of the examples. The features described herein can be realized and achieved through the practice or use of various aspects of the methodologies, instruments, and combinations presented in the detailed examples discussed below. Brief Description of the Figures of the Invention The present exhibition is further illustrated in terms of exemplary modalities. These exemplary modalities are described in detail with reference to the drawings. These modalities are not restrictive. In these modalities, the same number represents the same structure, where: Figure 1 is a schematic diagram illustrating an exemplary acoustic output system according to some modalities of the present exposition; Figures 2A and 2B are schematic diagrams of an exemplary acoustic output device according to some modalities of the present exposition; Figure 3A is a schematic diagram of an exemplary acoustic output device according to some modalities of the present exposition; -5Figure 3B is a schematic diagram of another exemplary acoustic output device according to some modalities of the present exposition; Figure 4 is a schematic diagram of a resonance system according to some modalities of the present exposition; Figure 5 is a schematic diagram illustrating an acoustic output device according to some modalities of the present exposition; Figure 6 is a schematic diagram illustrating an acoustic output device according to some modalities of the present exposition; Figure 7 is a schematic diagram illustrating an acoustic output device according to some modalities of the present exposition; Figure 8 is a schematic diagram illustrating an acoustic output device according to some modalities of the present exposition; Figure 9 is a schematic diagram illustrating an acoustic output device according to some modalities of the present exposition; Figure 10 is a schematic diagram illustrating an acoustic output device according to some modalities of the present exposition; Figure 11 is a schematic diagram illustrating an acoustic output device according to some modalities of the present exposition; Figure 12 is a schematic diagram illustrating an acoustic output device according to some modalities of the present exposition; Figure 13 is a schematic diagram illustrating an acoustic output device according to some modalities of the present exposition; Figure 14 and Figure 15 are cross-sectional views of vibration diaphragms according to some modalities of the present exhibition; Figure 16 is a schematic diagram of different positions with respect to an acoustic output device according to some modalities of the present exposition; Figures 17, 18, 19, 20, and 21 are schematic diagrams of leakage frequency response curves for different relative positions to different acoustic output devices as described in Figure 16 according to some modalities of the present exposition; and Figures 22, 23, 24, and 25 are schematic diagrams showing a comparison of the leakage frequency response curves of different acoustic output devices at each same position as described in Figure 16 according to some modalities of the present exposition. -6 Detailed Description of the Invention The following description is presented to enable any person skilled in the art to understand and use this disclosure, and is provided in the context of a particular application and its requirements. Several modifications to the described embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments shown, but should be given the widest possible scope compatible with the claims. The terminology used herein is intended to describe particular exemplary modalities only and is not intended to be exhaustive. As used herein, the singular forms a, one, and the may be intended to include the plural forms as well, unless the context clearly indicates otherwise. It shall also be understood that the terms understand, understand, and / or that understands, include, includes, and / or including, when used herein, specify the presence of established features, whole numbers, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, whole numbers, operations, elements, components, and / or groups thereof. The terms system, processor, unit, module, and / or block used herein are understood to be a method for distinguishing different components, elements, parts, sections, or assemblies at different levels in ascending order. However, these terms may be replaced by other expressions if they achieve the same purpose. In general, the word module, unit, or block, as used herein, refers to logic embedded in hardware or firmware, or to a set of software instructions. A module, unit, or block described herein may be implemented as software and / or hardware and may be stored on any type of non-transient, computer-readable media or other storage device. In some embodiments, a software module / unit / block may be compiled and linked into an executable program. It will be appreciated that software modules may be requested from other modules / units / blocks or from themselves, and / or may be invoked in response to events or interrupts. MA / a / ZUZZ / UI 11 / Z - 7 detected. Software modules / units / blocks configured for execution on processing devices may be provided on a computer-readable medium, such as a compact disc, digital video disc, flash drive, magnetic disk, or any other tangible medium, or as a digital download (and may originally be stored in a compressed or installable format that requires installation, decompression, or decryption before execution). Such software code may be stored, partially or completely, on a storage device of the execution processing device for execution by the processing device. The software instructions may be incorporated into the firmware, such as an EPROM.It will also be noted that hardware modules / units / blocks can be included in connected logic components, such as gates and flip-flops, and / or can be included in programmable units, such as arrays of programmable gates or processors. The modules / units / blocks or processing device functionality described herein can be implemented as software modules / units / blocks, but may be represented in hardware or firmware. In general, the modules / units / blocks described herein refer to logic modules / units / blocks that can be combined with other modules / units / blocks or divided into submodules / subunits / subblocks regardless of their physical organization or storage. The description may be applicable to a system, a processor, or a part thereof. When a unit, processor, module, or block is referred to as being powered on, connected, or coupled to another unit, processor, module, or block, it shall be understood that it may be directly powered on, connected, or coupled to, or communicating with, the other unit, processor, module, or block, or an intermediate unit, processor, module, or block may be present, unless the context clearly indicates otherwise. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed elements. To illustrate the technical solutions related to the modalities in this exhibition, a brief introduction to the drawings referenced within the exhibition is provided below. Obviously, the drawings described below are only a few examples of the modalities in this exhibition. Those with basic technical skills can apply them without further creative effort. -8The present exposure to other similar scenarios according to these drawings. Unless otherwise indicated or obvious from the context, the same reference number in the drawings refers to the same structure and function. The technical solutions for the methods presented here will be described with reference to the drawings below. It is clear that the methods described are not exhaustive and are not limiting. Other methods obtained, based on those presented here, by those with ordinary technical knowledge but without any creative input, fall within the scope of this exhibition. One aspect of this discussion concerns an acoustic output device. The acoustic output device may include a bone conduction unit, an air conduction unit, and a housing configured to accommodate both the bone conduction unit and the air conduction unit. The air conduction unit can generate air conduction sound waves based on the vibration of the housing and / or the bone conduction unit when the bone conduction unit generates bone conduction sound waves. Various spatial arrangements and / or frequency distributions of the bone conduction unit and the air conduction unit can be provided to enhance sound quality, enrich low-frequency sounds, and reduce sound leakage from the acoustic output device, thereby improving the audio experience of a user of the acoustic output device. Figure 1 is a schematic diagram illustrating an exemplary acoustic output system according to some of the modalities of this exposition. The acoustic output system 100 may include a multimedia platform 110, a network 120, an acoustic output device 130, a terminal device 140, and a storage device 150. The multimedia platform 110 can communicate with one or more components of the acoustic output system 100 or an external data source (e.g., a cloud data center). In some modes, the multimedia platform 110 can provide data or signals (e.g., audio data from a piece of music) to the acoustic output device 130 and / or the user terminal 140. In some modes, the multimedia platform 110 can facilitate data / signal processing for the acoustic output device 130 and / or the user terminal. -9 user 140. In some configurations, the multimedia platform 110 can be deployed on a single server or on a group of servers. The server group can be a centralized group of servers connected to network 120 via an access point or a group of distributed servers connected to network 120 via one or more access points, respectively. In some configurations, the multimedia platform 110 can connect locally to network 120 or remotely to network 120. For example, the multimedia platform 110 can access information and / or data stored on the acoustic output device 130, the user terminal 140, and / or the storage device 150 via network 120. As another example, the storage device 150 can serve as data storage for the multimedia platform 110 server. In some configurations, the multimedia platform 110 can be deployed on a cloud platform.Just as an example, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an inter-cloud, a multi-cloud, or the like, or any combination thereof. In some configurations, the multimedia platform 110 may include a processing device 112. The processing device 112 can perform the main functions of the multimedia platform 110. For example, the processing device 112 can retrieve audio data from the storage device 150 and transmit the retrieved audio data to the acoustic output device 130 and / or the user terminal 140 to generate sounds. As another example, the processing device 112 can process signals (e.g., generate a control signal) for the acoustic output device 130. In some configurations, the 112 processing device may include one or more processing units (e.g., single-core or multi-core processing devices). By way of example only, the 112 processing device 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 similar components, or any combination thereof. - 10 Network 120 can facilitate the exchange of information and / or data. In some modalities, one or more components in the acoustic output system 100 (e.g., the multimedia platform 110, the acoustic output device 130, the user terminal 140, the storage device 150) can send information and / or data to another component(s) in the acoustic output system 100 via network 120. In some modalities, network 120 can be any type of wired or wireless network, or a combination thereof.By way of example only, Network 120 may include a wired network, a fiber optic 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 similar, or any combination thereof. In some configurations, Network 120 may include one or more network access points. For example, Network 120 may include wired or wireless network access points, such as base stations and / or Internet exchange points, through which one or more components of the Acoustic Output System 100 can connect to Network 120 to exchange data and / or information. The Acoustic Output Device 130 can emit acoustic sounds to a user and interact with the user. In one respect, the Acoustic Output Device 130 can provide the user with at least audio content, such as songs, poems, news broadcasts, weather reports, audio lessons, etc. In another respect, the user can provide feedback to the Acoustic Output Device 130 by, for example, keys, a touchscreen, body movements, voice, gestures, thoughts, etc. In some modalities, the Acoustic Output Device 130 can be a wearable device. Unless otherwise specified, the wearable device as used herein can include headphones and other types of personal devices, such as head, shoulder, or body devices. The wearable device can present at least audio content to the user with or without contact with the user.In some forms, the wearable device may include a smart headset, smart glasses, a head-mounted display (HMD), a smart bracelet, smart shoes, smart glasses, a smart helmet, a smart watch, smart clothing, etc. - 11. A smart backpack, a smart accessory, a virtual reality headset, virtual reality glasses, a virtual reality patch, an augmented reality headset, augmented reality glasses, an augmented reality patch, or the like, or any combination thereof. For example, the wearable device could be similar to Google Glass™, Oculus Rift™, HoloLens™, Gear VR™, etc. The acoustic output device 130 can communicate with the user terminal 140 via the network 120. In some modes, various types of data and / or information, including, for example, motion parameters (e.g., a geographical location, direction of movement, speed of movement, acceleration, etc.), voice parameters (voice volume, voice content, etc.), gestures (e.g., a handshake, a head shake, etc.), user thoughts, etc., can be received by the acoustic output device 130. In some modes, the acoustic output device 130 can also transmit the received data and / or information to the multimedia platform 110 or to the user terminal 140. In some embodiments, the user terminal 140 can be customized, e.g., via an application installed on it, to communicate with and / or implement data / signal processing for the acoustic output device 130. The user terminal 140 can include a mobile device 130-1, a tablet 130-2, a laptop computer 130-3, a vehicle-integrated device 130-4, or the like, or any combination thereof. In some embodiments, the mobile device 130-1 can include a smart home device, a smart mobile device, or the like, or any combination thereof. In some embodiments, the smart home device can include a smart lighting device, a smart electrical appliance control device, a smart monitoring device, a smart television, a smart video camera, an intercom, or the like, or any combination thereof.In some embodiments, the smart mobile device may include a smartphone, personal digital assistant (PDA), gaming device, navigation device, point-of-sale (POS) device, or the like, or any combination thereof. In some embodiments, a vehicle-mounted device 130-4 may include a built-in computer, an onboard television, a built-in tablet, etc. In some embodiments, the user terminal 140 may include. - 12 a signal transmitter and a signal receiver configured to communicate with a positioning device (not shown in the figure) to locate the position of the user and / or the user terminal 140. In some modalities, the multimedia platform 110 or the storage device 150 can be integrated into the user terminal 140. In such a case, the functions that the multimedia platform 110 described above can achieve can be similarly achieved by the user terminal 140. The storage device 150 can store data and / or instructions. In some embodiments, the storage device 150 can store data obtained from the multimedia platform 110, the acoustic output device 130, and / or the user terminal 140. In some embodiments, the storage device 150 can store data and / or instructions where the multimedia platform 110, the acoustic output device 130, and / or the user terminal 140 can implement various functions. In some embodiments, the storage device 150 can include mass storage, removable storage, volatile read / write memory, read-only memory (ROM), or similar, or any combination thereof. Exemplary mass storage can include a magnetic disk, an optical disk, a solid-state drive, etc.Examples of removable storage may include a flash drive, floppy disk, optical disc, memory card, Zip disk, magnetic tape, etc. Examples of volatile read / write memory may include random access memory (RAM). Examples of RAM may include dynamic RAM (DRAM), double data rate synchronous dynamic RAM (DDR SDRAM), static RAM (SRAM), thyristor RAM (T-RAM), and zero capacitor RAM (Z-RAM). Examples of ROM may include mask ROM (MROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically programmable ROM (EEPROM), compact disc ROM (CD-ROM), and digital versatile disc ROM, etc. In some embodiments, the 150 storage device may be implemented on a nude platform.By way of example only, the nude platform may include a private nude, a public nude, a hybrid nude, a community nude, a distributed nude, an internet nude, a multi-nude, or similar, or any combination thereof. In some modalities, one or more components in the acoustic output system 100 may access data or instructions stored in the storage device 150 via the network 120. In some modalities, the device. - 13 storage 150 can be directly connected to the multimedia platform 110 as server storage. In some configurations, the multimedia platform 110, the terminal device 140, and / or the storage device 150 can be integrated into the acoustic output device 130. Specifically, as technology advances and the processing capabilities of the acoustic output device 130 improve, all processing can be performed by the acoustic output device 130. For example, the acoustic output device 130 can be a smart headset, an MP3 player, headphones, etc., with highly integrated electronic components such as central processing units (CPUs), graphics processing units (GPUs), etc., thus having a large processing capacity. Figures 2A and 2B are schematic diagrams of an exemplary acoustic output device according to some modalities of the present disclosure. Figure 2A illustrates an oblique view of the acoustic output device 130. Figure 2B illustrates an exploded view of the acoustic output device 130. The acoustic output device 130 can be described in combination with Figures 2A and 2B. In some embodiments, the acoustic output device 130 may include ear hooks 10, earphone core housings 20, a circuit housing 30, back hooks 40, earphone cores 50, a control circuit 60, and a battery 70. The earphone core housings 20 and the circuit housing 30 may be positioned at either end of the ear hooks 10, respectively, and the back hooks 40 may also be configured at one end of the circuit housing 30 away from the ear hooks 10. The earphone core housings 20 may be used to house different earphone cores 50. The circuit housing 30 may be used to house the control circuit 60 and the battery 70. Two ends of the back hooks 40 may be physically connected to the corresponding circuit housing 30, respectively.Ear hooks 10 may refer to structures configured to hang the acoustic output device 130 on the user's ears when the user uses the acoustic output device 130, and fix the earphone core housings 20 and earphone cores 50 in predetermined positions relative to the user's ears. iviA / a / zuzz / u ι 11 - 14 In some embodiments, the ear hooks 10 may include an elastic metal wire. The elastic metal wire can be configured to hold the ear hooks 10 in a shape that matches the user's ears with a certain degree of elasticity, allowing for some elastic deformation according to the shape of the user's ear and head when the user wears the acoustic output device 130, thus adapting to users with different ear and head shapes. In some embodiments, the elastic metal wire may be made of a shape-memory alloy with good deformation recovery capability. Even if the ear hooks 10 are deformed due to an external force, they can return to their original shape when the external force is removed, thus extending the service life of the acoustic output device 130.In some embodiments, the elastic wire may also be made of a non-memory alloy. A conductor may be provided in the elastic metal wire to establish an electrical connection between the earphone cores 50 and other components, such as the control circuit 60, battery 70, etc., to facilitate power supply and data transmission for the earphone cores 50. In some embodiments, the ear hooks 10 may further include a protective sleeve 16 and a housing protector 17 integrally formed with the protective sleeve 16. In some models, the headset core housings can be configured to accommodate headset cores. Headset cores can include a bone conduction unit, an air conduction unit, etc. The bone conduction unit can be configured to emit acoustic waves conducted through a solid medium (e.g., bones) (also known as bone conduction acoustic waves). For example, the bone conduction unit can convert an electrical signal into vibrations in a user's cranial bone through direct contact with the user. The air conduction unit can be configured to emit acoustic waves conducted through the air (also called air conduction acoustic waves).For example, the aerotympanic conduction system can convert the vibration of the 20 earphone core housings, the bone conduction system, and / or the air vibration in the 20 earphone core housings into air vibrations detectable by the user's ear. The number of earphone cores is 50 and the number of housings is 20. MA / a / ZUZZ / UI 11 / Z - The 15 earphone cores can be two, which may correspond to the user's left and right ears, respectively. Details relating to the 50 earphone cores can be found elsewhere in this exposition, for example, Figures 3-13. In some models, the ear hooks 10 and the core housings 20 of the earphones can be molded separately and then assembled instead of molding both together directly. In some embodiments, the earphone core housings 20 may be provided with a contact surface 21. The contact surface 21 may be in contact with the user's skin. As used herein, the contact surface 21 may also be referred to as the top surface of the earphone core housings 20. The surface of the earphone core housings 20 that is opposite the top surface of the earphone core housings 20 may also be referred to as the back surface or rear surface of the earphone core housings 20. Bone conduction acoustic waves generated by one or more bone conduction installations of the earphone cores 50 may be transferred outside the earphone core housings 20 (e.g., to the user's eardrum) through the contact surface during operation of the acoustic output device 130.In some modalities, the material and thickness of the contact surface 21 can affect the transmission of bone conduction acoustic waves to the user, thus affecting sound quality. For example, if the material of the contact surface 21 is relatively soft, the transmission of bone conduction acoustic waves in the low-frequency range may be better than the transmission of bone conduction acoustic waves in the high-frequency range. Conversely, if the material of the contact surface 21 is relatively hard, the transmission of bone conduction acoustic waves in the high-frequency range may be better than the transmission of bone conduction acoustic waves in the low-frequency range. Figure 3A is a schematic diagram of an exemplary acoustic output device according to some embodiments of the present disclosure. As shown in Figure 3A, the acoustic output device 300 may include a signal processing module 310 and an output module 320. The signal processing module 310 can receive electrical signals from a signal source and process the electrical signals. The electrical signals can - 16 Represent audio content (e.g., music) to be output by the acoustic output device. In some modes, the electrical signals can be analog or digital signals. For example, the electrical signals can be digital signals obtained from the multimedia platform 110, the terminal device 140, the storage device 150, etc. The signal processing module 310 can process electrical signals. For example, the signal processing module 310 can process electrical signals by performing various signal processing operations, such as sampling, digitization, compression, frequency division, frequency modulation, encoding, or similar operations, or a combination thereof. The signal processing module 310 can also generate control signals based on the processed electrical signals. These control signals can be configured to control the output module 320 to output acoustic waves (i.e., the audio content). The output module 320 can generate and output bone conduction acoustic waves (also called bone conduction sounds) and / or air conduction acoustic waves (also called air conduction sounds). The output module 320 can receive control signals from the signal processing module 310 and generate bone conduction acoustic waves and / or air conduction acoustic waves based on those control signals. As used herein, bone conduction acoustic waves refer to acoustic waves conducted as mechanical vibrations through a solid medium (e.g., bones). Air conduction acoustic waves refer to acoustic waves conducted as mechanical vibrations through air. For illustrative purposes, output module 320 may include a bone conduction unit 321 and an aerotympanic conduction unit 322. The bone conduction unit 321 and / or the aerotympanic conduction unit 322 may be electrically coupled to the signal processing module 310. The bone conduction unit 321 may generate bone conduction acoustic waves in a particular frequency range (e.g., a low frequency range, a mid frequency range, a high frequency range, a low-mid frequency range, a high-mid frequency range, etc.) according to the control signals generated by the signal processing module 310. The aerotympanic conduction unit 322 may generate conduction acoustic waves. - 17aerotympanic in the same or different frequency ranges as the bone conduction installation 321 according to the vibration of the bone conduction installation 321, the vibration of a housing that houses the bone conduction installation 321 and the aerotympanic conduction installation 322, the vibration of the air in the housing and / or the control signals. In some modalities, the bone conduction device 321 and the aerotympanic conduction device 322 may be two independent functional devices or two independent components of a single device. As used herein, the independence of a first device from a second device means that the operation of the first / second device is not caused by the operation of the second / first device, or in other words, the operation of the first / second device is not a result of the operation of the second / first device.Taking the bone conduction unit and the aerotympanic conduction unit as examples, the aerotympanic conduction unit depends on the bone conduction unit because the aerotympanic conduction unit is triggered to generate aerotympanic conduction acoustic waves by the vibration of the bone conduction unit when the bone conduction unit generates the acoustic waves. As another example, when the bone conduction unit 321 receives control signals from the signal processing module 310, the bone conduction unit 321 can vibrate to generate the acoustic waves. The vibration of the bone conduction unit 321 can drive the vibration of the housing, and the vibration of the housing can drive the vibration of the aerotympanic conduction unit 322 to generate the acoustic waves. Different frequency ranges can be determined according to actual needs. For example, the low frequency range (also called low frequencies) can refer to a frequency range of 20 Hz to 150 Hz, the mid frequency range (also called mid frequencies) can refer to a frequency range of 150 Hz to 5 kHz, the high frequency range (also known as high frequencies) can refer to a frequency range of 5 kHz to 20 kHz, the low-mid frequency range (also known as low-mid frequencies) can refer to a frequency range of 150 Hz to 500 Hz, and the high-mid frequency range (also known as high-mid frequencies) can refer to a frequency range of 500 Hz to 5 kHz. As another - 18 For example, the low-frequency range can refer to a frequency range of 20 Hz to 300 Hz, the mid-frequency range can refer to a frequency range of 300 Hz to 3 kHz, the high-frequency range can refer to a frequency range of 3 kHz to 20 kHz, the low-mid-frequency range can refer to a frequency range of 100 Hz to 1000 Hz, and the high-mid-frequency range can refer to a frequency range of 1000 Hz to 10 kHz. It should be noted that the frequency range values ​​are provided for illustrative purposes only and are not intended to be limiting. The definitions of the above frequency ranges may vary according to different application scenarios and classification standards.For example, in some other application scenarios, the low-frequency range might refer to a frequency range of 20 Hz to 80 Hz, the mid-frequency range might refer to a frequency range of 160 Hz to 1280 Hz, the high-frequency range might refer to a frequency range of 2560 Hz to 20 kHz, the low-mid-frequency range might refer to a frequency range of 80 Hz to 160 Hz, and the high-mid-frequency range might refer to a frequency range of 1280 Hz to 2560 Hz. Optionally, different frequency ranges may or may not have overlapping frequencies. The aerotympanic conduction installation 322 can generate and emit aerotympanic conduction acoustic waves in the same or different frequency ranges as the aerotympanic conduction acoustic waves generated by the bone conduction installation 321. For example, bone conduction sound waves can include mid-to-high frequencies, while aerotympanic conduction sound waves can include mid-to-low frequencies. Mid-to-low frequency aerotympanic conduction sound waves can be used to complement mid-to-high frequency bone conduction sound waves. A single output from the acoustic output device can cover both mid-to-low and mid-to-high frequencies. In this case, improved sound quality (especially at low frequencies) can be achieved, and intense vibrations of the bone conduction speaker at low frequencies can be avoided. As another example, bone conduction sound waves can include low-mid frequencies, and aerotympanic conduction sound waves can include high-mid frequencies. In this case, the acoustic output device can provide alerts or warnings to a user through the loudspeaker. - 19 bone conduction and / or aerotympanic conduction loudspeaker, since the user is sensitive to low-mid frequency bone conduction acoustic waves and / or high-mid frequency aerotympanic conduction acoustic waves. As a further example, aerotympanic conduction acoustic waves can include low-mid frequencies, while bone conduction acoustic waves can include frequencies across a broader frequency range (wide-range frequencies) than aerotympanic conduction acoustic waves. The output of the low-mid frequencies can be enhanced, and the sound quality can be improved. Figure 3B is a schematic diagram of another exemplary acoustic output device according to some of the modalities of this disclosure. In some modalities, the acoustic output device 350 as illustrated in Figure 3B may be similar to or the same as the acoustic output device 300 as illustrated in Figure 3A, except that the acoustic output device 350 may further include bone conduction signal processing circuits 316, aerotympanic conduction signal processing circuits 317, and fusion circuits 318. The bone conduction signal processing circuits 316 may be configured to process bone conduction signals. The aerotympanic conduction signal processing circuits 317 may be configured to process aerotympanic conduction signals. In some modalities, the electrical signals may include both bone conduction and aerotympanic conduction signals.As used herein, bone conduction signals refer to electrical signals related to bone conduction acoustic waves and / or electrical signals that impact the generation and output of bone conduction acoustic waves. Aerotympanic conduction signals refer to electrical signals related to aerotympanic conduction acoustic waves and / or electrical signals that impact the generation and output of aerotympanic conduction acoustic waves. In some modalities, the 316 bone conduction signal processing circuit can receive bone conduction signals from the signal source, process the bone conduction signals, and generate a corresponding bone conduction control signal. The bone conduction control signal refers to a signal that controls the generation and output of bone conduction acoustic waves.Similarly, the 317 aerotympanic conduction signal processing circuit can receive aerotympanic conduction signals from the signal source (e.g., an aerotympanic conduction microphone), process the signals from. -20 aerotympanic conduction and generate a corresponding aerotympanic conduction control signal. The aerotympanic conduction control signal refers to a signal that controls the generation and output of aerotympanic conduction acoustic waves. In some configurations, the acoustic output device 350 may also include a fusion circuit 318 configured to combine bone conduction control signals and aerotympanic conduction signals, or to combine processed aerotympanic conduction signals and processed bone conduction signals to generate integrated control signals. For example, the bone conduction signal processing circuit 316 can determine low-frequency components in the bone conduction signals to obtain the processed bone conduction signals. The aerotympanic conduction signal processing circuit 317 can determine high-frequency components in the aerotympanic conduction signals to obtain the processed aerotympanic conduction signals. The fusion circuit 318 can fuse the low-frequency and high-frequency components to generate the integrated control signals.When the bone conduction unit 321 receives control signals from the signal processing module 315, the bone conduction unit 326 can vibrate to generate bone conduction acoustic waves. The vibration of the bone conduction unit 326 can then drive the vibration of the aerotympanic conduction unit 327 to generate aerotympanic conduction acoustic waves. The output module 325 may include a bone conduction facility 326 and an aerotympanic conduction facility 327. The bone conduction facility 326 and the aerotympanic conduction facility 327 may be the same as or similar to the bone conduction facility 321 and the aerotympanic conduction facility 322 of the output module 320 in Figure 3A, respectively, which may not be repeated herein. In some configurations, the bone conduction unit 326 can be electrically coupled to the bone conduction signal processing circuit 316. The bone conduction unit 326 can generate and emit bone conduction acoustic waves within a specific frequency range according to the bone conduction control signals generated by the bone conduction signal processing circuit 316. The aerotympanic conduction unit 327 can also be electrically coupled to the conduction signal processing circuit. - 21 aerotympanic 317. And the bone conduction installation 327 can generate and emit aerotympanic conduction acoustic waves in the same or different frequency ranges as the bone conduction installation 326 according to the aerotympanic conduction control signals generated by the aerotympanic conduction signal processing circuits 317. In conjunction with Figure 3A and Figure 3B, to adjust the output characteristics (e.g., frequency, phase, amplitude, etc.) of bone conduction acoustic waves and / or air conduction acoustic waves, the bone conduction control signals and / or air conduction control signals can be further processed in the signal processing module 310 or 315, such that the bone conduction acoustic waves and / or air conduction acoustic waves can have different output characteristics. For example, the bone conduction control signals and / or air conduction control signals can include specific frequencies. In some alternative modalities, the structure of each of at least one component and / or the arrangement of at least one component within the output module 320 or 325 can be modified or optimized so that the output characteristics (e.g.,, frequencies) of bone conduction acoustic waves and / or aerotympanic conduction acoustic waves can be adjusted. In some configurations, one or more filters or filter sets may be provided in the 310 or 315 signal processing module to process the bone conduction control signals and / or the air-tympanic conduction control signals for adjusting the output characteristics (e.g., frequencies) of the bone conduction acoustic waves and / or the air-tympanic conduction acoustic waves. Exemplary filters or filter sets may include, but are not limited to, analog filters, digital filters, passive filters, active filters, or similar filters, or a combination thereof. In some configurations, a time-domain processing method may be provided to enrich the acoustic effect of the sounds emitted by the 320 or 325 output module. Exemplary time-domain processing methods may include dynamic range control (DRC), time delay, and reverberation, etc. In some models, the 300 or 350 acoustic output device may also include an active leakage reduction module. In some models, the - The active leakage reduction module 22 can emit acoustic waves directly, without feedback from a reference (e.g., a microphone), to overlay and cancel out leakage acoustic waves (i.e., sound leaks) from the acoustic output device 300 or 350. The acoustic waves emitted from the active leakage reduction module can have the same amplitudes, frequencies, and inverse phases relative to the leakage acoustic waves. In some alternative configurations, the active leakage reduction module can emit acoustic waves in accordance with feedback from a reference. For example, a microphone can be placed within the sound field of the acoustic output device 300 or 350 to obtain information about the sound field (e.g., position, frequency, phase, amplitude, etc.).) and provide real-time feedback to the active leakage reduction module to dynamically adjust the output acoustic waves to reduce or eliminate sound leakage from the 300 or 350 acoustic output device. In some modes, the active leakage reduction module may be incorporated into the 320 or 325 output module. In some configurations, the acoustic output device 300 or 350 may also include a beamforming module. The beamforming module can be configured to form a specific sound beam from bone conduction acoustic waves and / or air conduction acoustic waves. In some configurations, the beamforming module can form a specific sound beam by controlling the amplitudes and / or phases of the bone conduction acoustic waves and / or air conduction acoustic waves propagated from the output module 320 (e.g., the bone conduction unit 321 and the air conduction unit 322) or the output module 325 (e.g., the bone conduction unit 326 and an air conduction unit 327). The sound beam may be, for example, a fan-shaped beam at a specific angle.The sound beam can propagate in a particular direction to achieve maximum sound pressure levels near human ears. Simultaneously, the sound pressure level at other points in the sound field can be relatively low, reducing sound leakage from the 300 or 350 acoustic output device. In some configurations, the 300 or 350 acoustic output device can produce a more ideal three-dimensional sound field using 3D sound field reconstruction techniques or local sound field control techniques, allowing the user to experience greater immersion. In some configurations, the beamforming module... MA / a / ZUZZ / UI 11 / Z -23 can also be incorporated into output module 320 or 325. Figure 4 is a schematic diagram of a resonance system according to some modalities of the present exposition. In some modalities, the effects of structures and / or arrangements of one or more components of the acoustic output device 130 on the characteristics of the acoustic sounds emitted by the acoustic output device 130 can be modeled using the resonance system 400. In some modalities, the resonance system 400 can be described in combination with a mass-spring damping system. In some modalities, the resonance system 400 can be described in combination with a plurality of mass-spring damping systems connected in parallel or in series. A motion of the resonance system 400 can be expressed in Equation (1): d-χ Λ M--R--Ex = F (1) Λ- di where M indicates the mass of the resonance system 400, R indicates the damping of the resonance system 400, K indicates an elastic coefficient of the resonance system 400, E indicates a driving force and x indicates a displacement of the resonance system 400. In some modalities, the resonant frequency of the 400 resonance system can be obtained by solving Equation (1). The resonant frequency of the 400 resonance system can be obtained according to Equation (2): Where / o indicates the resonance frequency of the 400 resonance system. In some modes, a frequency bandwidth can be determined according to a half-power point. A Q factor of the 400 resonance system can be determined according to Equation (3): Q=^ (3) In cases involving multiple resonant systems, the vibration characteristics (e.g., amplitude-frequency response, phase-frequency response, transient response, etc.) of each of the multiple resonant systems may be the same or different. For example, each of the multiple resonant systems may be driven by the same driving force or by different driving forces. - 24 In some modalities, each of the bone conduction unit 321, the aerotympanic conduction unit 322, the bone conduction unit 326, or the aerotympanic conduction unit 327 may be a single resonance system or a combination of a plurality of resonance systems. In some modalities, the output module 320 or 325 may also include a plurality of bone conduction units and / or a plurality of aerotympanic conduction units. Regarding bone conduction acoustic waves, the frequencies and bandwidths of these waves can be adjusted by changing the parameters exemplified earlier (e.g., mass, damping, etc.). For example, the resonant frequency can be adjusted to a low-to-mid frequency range by increasing the mass or reducing the spring constant (e.g., by using a spring with a lower spring constant, a material with a lower Young's modulus as the vibration transfer structure, or by reducing the thickness of the vibration transfer structure). In this case, the 400 resonance system (e.g., the bone conduction unit) can generate vibrations in the low-to-mid frequency range.As another example, the resonant frequency can be adjusted to a mid-to-high frequency band by reducing the mass of the 400 resonance system, increasing its spring coefficient (using a spring with a higher spring coefficient, a material with a higher Young's modulus as the vibration transfer structure, increasing the thickness of the vibration transfer structure, etc., adding edges or other reinforcing structures to the vibration transfer structure, etc.). In this case, the 400 resonance system can generate vibrations in the mid-to-high frequency range. As a further example, the bandwidth of the 400 resonance vibration system's output can be adjusted by changing the Q factor. Finally, a composite resonance system comprising multiple resonance systems can be provided.The resonant frequency and Q factor of each resonant system can be adjusted separately. A center frequency and bandwidth for the composite resonant system can be adjusted by connecting multiple resonant systems in series or parallel. Regarding aerotympanic conduction acoustic waves, the frequencies and bandwidths of aerotympanic conduction acoustic waves can -25 can be adjusted by changing the parameters exemplified above (e.g., mass, damping, etc.) in a similar manner. In some modalities, one or more acoustic structures may be provided to adjust the frequencies of the aerotympanic conduction acoustic waves. The one or more acoustic structures may include, for example, an acoustic cavity, a sound conduction tube (also called a sound tube), a sound hole, a decompression hole, a tuning net, tuning cotton, a passive vibrating diaphragm, or the like, or a combination thereof. For example, the system's elastic coefficient 400 can be adjusted by changing the volume of the acoustic cavity. Increasing the volume of the acoustic cavity may lower the system's elastic coefficient. Decreasing the volume of the acoustic cavity may increase the system's elastic coefficient.In some modalities, the mass and damping of the 400 system can be adjusted by placing a sound tube or sound hole. The longer the sound tube or sound hole, the smaller the cross-section, the greater the mass, and the lower the damping. Conversely, the shorter the sound tube or sound hole, the larger the cross-section, the lower the mass, and the greater the damping. In some modalities, the damping of the 400 system can be adjusted by placing acoustic resistance materials (e.g., tuning holes, tuning nets, tuning cotton, etc.) in a path through which the aerotympanic conduction sound waves propagate. In some modalities, the aerotympanic conduction sound waves in a low-frequency range can be enhanced by establishing a passive vibrating diaphragm.In some modalities, the phases, amplitudes, and / or frequency ranges of the aerotympanic conduction acoustic waves can be adjusted by placing one or more sound tubes and / or phase-inversion holes. In other modalities, a series of aerotympanic conduction units may be provided. The amplitude, frequency range, and phase of each aerotympanic conduction unit can be adjusted to form a sound field with a particular spatial distribution. In some modalities, the output characteristics of the bone conduction acoustic waves and / or the aerotympanic conduction acoustic waves can also be adjusted by the user (e.g., by setting an amplitude, frequency, and / or phase of a control signal). In some modalities, the output characteristics of the bone conduction acoustic waves and / or the aerotympanic conduction acoustic waves -26Aerotympanic conduction can also be adjusted through the parameters of the 400 resonance system and the control signal set by the user. Figure 5 is a schematic diagram illustrating an acoustic output device according to some of the modalities described herein. As shown in Figure 5, the acoustic output device 500 may include a bone conduction unit 510, a housing 520, and an air-tympanic conduction unit. The bone conduction unit 510 and the air-tympanic conduction unit may be housed together in the same housing 520. The bone conduction unit 510 may generate bone conduction acoustic waves that are transmitted to a user through the housing 520, and the air-tympanic conduction unit may generate air-tympanic conduction acoustic waves based on the vibration of the bone conduction unit 510. The air-tympanic conduction acoustic waves may be transmitted to the user through one or more sound outlets in the housing 520. In some configurations, the 500 acoustic output device may also include a signal processing module that is similar to or the same as the 310 or 315 signal processing module. The 510 bone conduction unit may be electrically connected to the signal processing module to receive control signals (e.g., audio signals) and generate bone conduction acoustic waves based on those control signals. For example, the 510 bone conduction unit may be or include any element (e.g., a vibrator motor, an electromagnetic vibrator, etc.) that converts electrical signals (e.g., bone conduction control signals) into mechanical vibration signals. Exemplary forms of signal conversion may include, but are not limited to, electromagnetic types (e.g., a moving coil type, a moving iron type, a magnetostrictive type), piezoelectric types, electrostatic types, etc.The internal structures of the 510 bone conduction unit can be a simple or a compound resonance system. In some modalities, the 510 bone conduction unit can generate mechanical vibrations in accordance with bone conduction control signals. These mechanical vibrations can then generate bone conduction acoustic waves. As illustrated in Figure 5, the bone conduction installation 510 may include a magnetic circuit system 511, one or more vibrating plates 512, and a voice coil 513. The magnetic circuit system 511 may include one or more vibrating plates 512 and a voice coil 513. - 27 additional magnetic elements and / or magnetic guide elements configured to generate a magnetic field. In some embodiments, the magnetic circuit system 511 may include a magnetic space. The magnetic circuit system 511 may generate the magnetic field in the magnetic space. The voice coil 513 may be located in the magnetic space. At least one of the vibrating plates 512 may be physically connected to the housing 520, which may be in contact with a user's skin (e.g., the skin of the user's head) and transfer bone conduction acoustic waves to a user's cochlea when the user uses the acoustic output device. In some embodiments, one of the vibrating plates 512 may also be referred to as the upper wall of the housing 520. As used herein, the lower or upper portion of a component is described with respect to a user's skin.For example, in housing 520, the wall closest to the user's skin (e.g., the wall attached to the skin) is called the upper wall or front wall, and the wall farthest from the user's skin (e.g., the wall opposite the upper wall) is called the lower wall or back wall. The voice coil 513 can be mechanically connected to at least one of the vibrating plates 512. In some modalities, the voice coil 513 can also be electrically connected to the signal processing module. When a current (representing the control signals) is introduced into the voice coil 513, the voice coil 513 can vibrate in the magnetic field and cause one or more vibrating plates 512 to vibrate. The vibration of the one or more vibrating plates 512 can be transmitted to a user's bones through housing 520 to generate bone conduction acoustic waves.In some embodiments, vibration of one or more vibrating plates 512 may cause vibration of the housing 520 and / or the magnetic circuit system 511. Vibration of the housing 520 and / or the magnetic circuit system 511 may cause air vibration in the housing 520. The aerotympanic conduction system may include a vibrating diaphragm 531. The vibrating diaphragm 531 may be physically connected to the bone conduction system 510 and / or the housing 520. For example, the vibrating diaphragm 531 may be connected to the magnetic circuit system 511, the voice coil 513, and / or at least one of the vibrating plates 512. When the bone conduction system 510 (e.g., the vibrating plates 512) vibrates to generate the bone conduction acoustic waves, the -28 Vibration of the bone conduction unit 510 (e.g., one or more vibrating plates 512) can drive the vibration of the housing 520 and / or the vibration diaphragm 531, which is physically connected to the bone conduction unit 510 and / or the housing 520. Vibration of the vibration diaphragm 531 can cause vibration of the air in the housing 520. The vibration of the air in the housing 520 can be transmitted from the housing 520 to generate aerotympanic conduction acoustic waves. The aerotympanic conduction acoustic waves and the bone conduction acoustic waves can represent the same audio signal being introduced into the bone conduction unit 510 or the same audio signal being received by a user.As used herein, the terms aerotympanic conduction sound waves and bone conduction sound waves representing the same audio signal mean that both waves represent the same speech content, as indicated by the frequency components within the two waves. The frequency components of these waves may differ. For example, bone conduction waves may contain more low-frequency components, while aerotympanic conduction waves may contain more high-frequency components.In some embodiments, in the vibration process, the vibration diaphragm 531 can be physically connected to the magnetic circuit system 511. The vibration diaphragm 531 and the magnetic circuit system 511 can be considered immobilizers, and the vibration of the housing 520 in relation to the housing 520 can cause the pressure change in the first cavity 523 and the second cavity 524, thus causing the air vibration in the first cavity 523 and the second cavity 524.In some embodiments, in the vibration process, the vibration diaphragm 531 may be physically connected to the magnetic circuit system 511, the housing 520 may be considered immobilized and the vibration diaphragm 531 and the magnetic circuit system 511 may vibrate in relation to the housing 520, and the vibration diaphragm 531 and the magnetic circuit system 511 may cause the pressure change in the first cavity 523 and the second cavity 524, thus causing the air vibration in the first cavity 523 and the second cavity 524. The 531 vibration diaphragm may include a thin film made of vibration-sensitive materials. Exemplary materials of the diaphragm of -29vibration 531 may include polyarylester (PAR), thermoplastic elastomer (TPE), polytetrafluoroethylene (PTFE), etc. In some embodiments, the vibration diaphragm 531 may include a main portion and an auxiliary portion. The main portion may be physically connected to the lower surface of the magnetic circuit system 511, which is located away from the upper wall of the housing 520. In some embodiments, the main portion may include a plate (e.g., a circular plate or an annular plate) that covers at least a portion of the lower surface of the magnetic circuit system 511. In some embodiments, the main portion may include a base plate (e.g., a circular plate or an annular plate) that covers at least a portion of the lower surface of the magnetic circuit system 511 and a side wall that connects to the side wall of the magnetic circuit system 511. The auxiliary portion may be annular in shape and surround the main portion. The auxiliary portion may be physically connected to the housing 520.For example, the inner side of the auxiliary portion may be in contact with or connected to the outside of the main portion, and the outside of the auxiliary portion may be physically connected to the housing 520. In some embodiments, the auxiliary portion may include at least one protrusion area or one groove area. Further descriptions for the vibration diaphragm 531 can be found elsewhere in this document (e.g., Figures 14 and 15 and their descriptions). Housing 520 may include a space configured to accommodate the bone conduction system 510 and / or one or more components of the aerotympanic conduction system. In some modalities, the vibration diaphragm 531 may be located in the space and divide it into a first cavity 523 and a second cavity 524. In some modalities, the first cavity 523 and the second cavity 524 may not be in flow communication. In some modalities, the first cavity 523 and the second cavity 524 may be in flow communication. For example, the vibration diaphragm 531 may be provided with one or more through-holes. Housing 520 may include a first portion and a second portion. The first portion of housing 520 and the vibration diaphragm 531 may form the first cavity. The first portion of housing 520 around the first cavity may be physically connected to the bone conduction installation 510 (e.g., one or more vibration plates 512) and transfer the vibration from the -30 bone conduction installation 510 to a user's bone when the user is wearing the acoustic output device 500. The second portion of the housing 520 and the vibration diaphragm 531 can form the second cavity. Aerotympanic conduction acoustic waves generated by the aerotympanic conduction installation can propagate from the second cavity 524. As used herein, the first cavity can also be referred to as the frontal cavity, which is closer to the user's skin, and the second cavity can also be referred to as the posterior cavity, which is farther from the skin when the user is wearing the acoustic output device 500. In some embodiments, at least one sound outlet 521 may be arranged on a side wall of the second portion of the housing 520, and the sound outlet 521 may be in communication with the second cavity 524. In some embodiments, the minimum sound outlet 521 may include one or more sound holes (also referred to as one or more first holes). The sound holes may be through holes. Due to the interaction between the magnetic field and the voice coil 513, the magnetic circuit system 511 may also receive a corresponding reaction force to vibrate and excite the vibrating diaphragm 531 to vibrate. The vibration of the vibrating diaphragm 531 may cause the air in the second cavity 524 to vibrate. The vibration of the air in the second cavity 524 may generate aerotympanic conduction acoustic waves in the second cavity 524 that may propagate from the second cavity 524.In some modes, when the user is wearing the acoustic output device 500, the sound output 521 can be directed towards the external auditory canal of the user's ear. In some modalities, when the interaction between the voice coil 513 and the magnetic circuit system 511 (i.e., the vibration of the voice coil 513 under the magnetic field provided by the magnetic circuit system 511) causes the housing 520 to move toward the front of the acoustic output device 500 (i.e., along the direction indicated by arrow A or toward the user's skin) and the vibrating diaphragm 531 (the housing 520 can be considered to move along the direction indicated by arrow A, while the magnetic circuit system 511 and the vibrating diaphragm 531 remain stationary), the first cavity 523 in the housing 520 becomes larger, the second cavity 524 becomes smaller, and the pressure within the second cavity 524 increases. As the housing 520 moves toward the -31 The pressure from one or more vibrating plates 512 acting on the user's skin may increase, and the bone conduction acoustic waves transmitted by the bone conduction device 510 may be defined as being in positive phase. Similarly, because the pressure within the second cavity 524 increases, the aerotympanic conduction acoustic wave generated by the aerotympanic conduction device and conducted from the second cavity 524 may also be in positive phase. In some modalities, the aerotympanic conduction acoustic wave and the bone conduction acoustic wave may be in the same phase, i.e., the phase difference between the aerotympanic conduction acoustic wave and the bone conduction acoustic wave may be equal to 0.In some modalities, the phase difference between the aerotympanic conduction sound wave and the bone conduction sound wave may be smaller than a threshold, such as π, 2π / 3, 1π / 2, etc. As used herein, the phase difference between the aerotympanic conduction sound wave and the bone conduction sound wave may refer to the absolute value of the difference between the phases of the aerotympanic conduction sound wave and the bone conduction sound wave. In some modalities, the frequency ranges of the phase difference between the aerotympanic conduction sound wave and the bone conduction sound wave may correspond to different phase differences and different thresholds. For example, the phase difference between the aerotympanic conduction sound wave and the bone conduction sound wave in a frequency range below 300 Hz may be less than π.As another example, the phase difference between the aerotympanic conduction sound wave and the bone conduction sound wave in a frequency range below 1000 Hz (e.g., from 300 Hz to 1000 Hz) can be less than 2π / 3. As yet another example, the phase difference between the aerotympanic conduction sound wave and the bone conduction sound wave in a frequency range below 3000 Hz (e.g., from 1000 Hz to 3000 Hz) can be less than 1π / 2. Therefore, the synchronization of the bone conduction sound wave and the aerotympanic conduction sound wave can increase, which can cause an overlap of the bone conduction sound wave and the aerotympanic conduction sound wave, thus enhancing the auditory effect. The time difference between the aerotympanic conduction sound wave and the bone conduction sound wave received by the user can be below a threshold, such as 0.1 seconds. In some models, a decompression hole 522 (also called -32 second orifice) can be established in the housing. For example, the decompression orifice 522 can be placed in a wall of the first portion of the housing 520. The first cavity 523 can be in flow communication with the outside of the acoustic outlet device 500 through the decompression orifice 522. As a further example, the decompression orifice 522 and the sound outlet 521 can be arranged in different side walls of the housing 520. As yet another example, the decompression orifice 522 and the sound outlet 521 can be arranged in different side walls of the housing 520 that are not adjacent, for example, substantially parallel to each other. The decompression port may be a through-hole that facilitates pressure equalization between the first cavity of housing 520 and the outside. In some embodiments, vibration of the magnetic circuit system 511 relative to housing 520 may increase or decrease the pressure in the first cavity 523. The decompression port 522 can adjust the pressure in the first cavity 523 by facilitating communication between the first cavity 523 and the outside, thereby maintaining mutual movement between housing 520 and the magnetic circuit system 511 (and / or the vibration diaphragm 531), and ensuring normal vibration of housing 520. Furthermore, the decompression port 522 can help adjust the frequency response of the aerotympanic conduction system at low frequencies. It should be noted that vibration of the magnetic circuit system 511 relative to the housing 520 can cause air vibration in the first cavity 523. The acoustic waves generated by the air vibration in the first cavity 523 can be transmitted to the outside through the decompression port 522, thus producing sound leakage. In some configurations, to reduce or eliminate sound leakage, the decompression port 522 can be specially designed. For example, the decompression port 522 can be larger, such that a resonance peak (Helmholtz resonance) of the first cavity 523 of the housing 520 can correspond to a higher frequency.In this way, the leakage of low-to-mid frequencies propagating outside the decompression hole 522 can be largely suppressed. Furthermore, the larger the size of the decompression hole 522, the lower the acoustic impedance and the lower the sound pressure level of the acoustic waves generated within the hole, thus reducing leakage. -33 sound. In some additional embodiments, a tuning grid (not shown) may be provided in the decompression hole 522 to reduce the intensity of the aforementioned resonance peak, thereby reducing the frequency response of the structure formed by the first cavity 523 and the decompression hole 522 to further reduce sound leakage. In some embodiments, the number of decompression holes may not be limited and may be one or more. The position of the decompression hole 522 may also be set at any position on the side wall corresponding to the first cavity 523. In some modes, by adjusting the stiffness of the vibration plate 512 and / or the housing 520 (by means of, e.g., structure sizes, material modulus of elasticity, edges and / or other special mechanical structures), the output characteristics of the bone conduction acoustic waves can be adjusted. In some embodiments, the output characteristics of the aerotympanic conduction acoustic waves can be adjusted by modifying the shape, elastic coefficient, and damping of the vibrating diaphragm 531. The output characteristics of the aerotympanic conduction acoustic waves can also be adjusted by modifying the number, position, size, and / or shape of at least one of the sound outlets 521 and / or the decompression orifice 522. For example, a damping structure (e.g., a tuning net) can be provided at the sound outlet 521 to achieve the acoustic effect of the aerotympanic conduction system. It should be noted that the number, sizes, shapes (e.g., cross-sectional shapes), and / or locations of one or more additional acoustic structures exemplified above (e.g., the sound hole, sound tube, decompression hole, and / or tuning grid) may be adjusted according to actual needs and are not limited to the present discussion. In some modalities, the number, sizes, shapes, and / or locations of one or more additional acoustic structures may be optimized according to the sound leakage of the acoustic output device 500. In some modalities, optimization may be performed according to the leakage frequency response curves provided below. Furthermore, the spatial arrangements of the bone conduction system and the aerotympanic conduction system and / or one or more components of the bone conduction system and of MA / a / ZUZZ / UI 11 / Z -34The aerotympanic conduction installation may not be limited in this exposition. For example, the spatial arrangement of the bone conduction installation and the aerotympanic conduction installation may vary according to actual needs and may not be limited. As another example, the position of the vibration diaphragm 531 in the housing 520, the orientation (e.g., a front-side direction) of the vibration diaphragm 531, etc., may vary according to actual needs and may not be limited. The acoustic output device provided herein can combine a bone conduction system (e.g., the 510 bone conduction system) and an aerotympanic conduction system to provide the user with enhanced acoustic effects and tactile sensations. In some modalities, the bone conduction and aerotympanic conduction acoustic waves emitted by the acoustic output device may include sound waves of different frequencies. In some embodiments, the sound outlet 521 of the acoustic output device 500 may also include a sound tube coupled to the sound hole. In some embodiments, aerotympanic conduction acoustic waves passing through the sound hole may enter the sound tube and propagate along a particular direction within the sound tube. In this way, the sound tube can change the direction in which the aerotympanic conduction acoustic waves propagate. For example, Figure 6 is a schematic diagram illustrating an acoustic output device according to some modalities of this disclosure. The acoustic output device 600 may be the same as or similar to the acoustic output device 500 of Figure 5. For example, the acoustic output device 600 may include a bone conduction unit 610, a housing 620, and an air-tympanic conduction unit. The bone conduction unit 610 and the air-tympanic conduction unit may be housed together in the same housing 620. As another example, the bone conduction unit 610 may include a magnetic circuit system 611, one or more vibrating plates 612, and a moving coil 613. The air-tympanic conduction unit may include a vibrating diaphragm 621.As a further example, a sound outlet 614 can be arranged in the wall of the housing 620 and in flow communication with a rear cavity 624, and a decompression hole 625 can be arranged in the wall of the housing 620 and in flow communication with a front cavity 623. -35 Further descriptions of the components in the 600 acoustic output device can be found elsewhere in this exposition (e.g., Figure 5 and its descriptions). Unlike the acoustic output device 500, the sound output 614 may include a sound tube 640. And the end of the sound tube 640 farthest from the sound output 614 may be oriented towards the user's ear when the user uses the acoustic output device as shown in Figure 6. In some embodiments, the decompression port 625 may not be a through-port. The decompression port 625 may be in flow communication with the outside of the acoustic output device via the sound outlet 614 or the sound tube. As a further example, the housing 620 may include a channel. The channel may be connected to the sound outlet 614 and the sound tube 640. Air in the front cavity 623 may flow from the front cavity 623 through the decompression port 625, the channel, and outward via the sound outlet 614 and the sound tube 640. It should be noted that the sound tube in this embodiment is also applicable to acoustic output devices in other embodiments of this exposition. Figure 7 is a schematic diagram illustrating an acoustic output device according to some of the modalities described herein. The acoustic output device 700 may be the same as or similar to the acoustic output device 600 in Figure 6. For example, the acoustic output device 700 may include a bone conduction unit 710, a housing 720, and an aerotympanic conduction unit. The bone conduction unit 710 and the aerotympanic conduction unit may be housed together in the same housing 720. As another example, the bone conduction unit 710 may include a magnetic circuit system 711, one or more vibrating plates 712, and a voice coil 713. The aerotympanic conduction unit may include a vibrating diaphragm 731 that connects to the housing 720 and / or the bone conduction unit 710.As a further example, a sound outlet 721 and a sound tube 740 can be arranged in a wall of the housing 720 and in flow communication with a rear cavity 724, and a decompression orifice 722 can be arranged in the wall of the housing 720 and in flow communication with a front cavity 723. Further descriptions of the components in the acoustic outlet device 700 can be found elsewhere in this exposition (e.g., Figures 5 and 6 and the descriptions of). -36 (the same). As shown in Figure 7, unlike the acoustic output device 600, the vibration diaphragm 731 can be arranged around the circumference of the magnetic circuit system 711. The vibration diaphragm 731 may include an annular plate or sheet. In some embodiments, the vibration diaphragm 731 may be concave or convex, which can increase elasticity and improve the frequency response of the vibration diaphragm 731 in the low-mid frequencies. Specifically, the inner side of the vibration diaphragm 731 may be physically connected to the outer wall of the magnetic circuit system 711, and the outer side of the vibration diaphragm 731 may be physically connected to the inner wall of the housing 720.The vibration diaphragm 731, which is arranged around the circumference of the magnetic circuit system 711, can reduce the space occupied by the vibration diaphragm 731, thereby reducing the volume of the acoustic output device 700. By reducing the volume and adjusting the position of the vibration diaphragm 731 at 720, the volume and / or weight of the acoustic output device 700 can be effectively reduced. Figure 8 is a schematic diagram illustrating an acoustic output device according to some of the modalities described herein. The acoustic output device 800 may be the same as or similar to the acoustic output device 600 of Figure 6. For example, the acoustic output device 800 may include a bone conduction unit 810, a housing 820, and an aerotympanic conduction unit. The bone conduction unit 810 and the aerotympanic conduction unit may be housed together in the same housing 820. As another example, the bone conduction unit 810 may include a magnetic circuit system 811, one or more vibrating plates 812, and a voice coil 813.As another example, a sound outlet 821 and a sound tube 840 can be arranged in a wall of the housing 820 and in flow communication with a rear cavity 824, and a decompression hole 822 can be arranged in the wall of the housing 820 and in flow communication with a front cavity 823. Further descriptions of the components in the acoustic outlet device 800 can be found elsewhere in this exposition (e.g., Figures 5 and 6 and their descriptions). As shown in Figure 8, unlike the 600 acoustic outlet device, the aerotympanic conduction installation may include at least -37 Two vibration diaphragms. For example, the aerotympanic conduction installation may include a first vibration diaphragm 831 and a second vibration diaphragm 833. The first vibration diaphragm 831 may be the same as or similar to vibration diaphragm 531 as described in Figure 5. The first vibrating diaphragm 831 can be driven to vibrate by the vibration of the magnetic circuit system 811 and / or the housing 820. The second vibrating diaphragm 833 can be driven to vibrate by the vibration of the housing 820 caused by the vibration of the magnetic circuit system 811 and / or the air vibration caused by the vibration of the first vibrating diaphragm 831. The second vibrating diaphragm 833 may also be referred to as the passive vibrating diaphragm 833. The second vibration diaphragm 833 can be disposed between the lower surface of the housing 820 opposite the position of the vibration plate 812 of the bone conduction system 810 and the first vibration diaphragm 831. Specifically, the second vibration diaphragm 833 can be disposed between the lower surface of the housing 820 and a plane where the sound outlet 821 is located along a direction parallel to the first vibration diaphragm 831. As shown in Figure 8, the second vibration diaphragm 833 can be disposed near or on the lower surface of the housing 820. The second vibration diaphragm 833 can be physically connected to the housing 820. The second vibration diaphragm 833 can be the same as or similar to the vibration diaphragm 831 as described in Figure 5. For example, the second vibration diaphragm 833 can include a main portion and an auxiliary portion.The main portion may be close to or physically connected with the lower surface of the 820 housing. The auxiliary portion may be annular in shape and surround the main portion. The auxiliary portion may be physically connected with the 820 housing. In some embodiments, the main portion may include a massive block and the auxiliary portion may include a spring. In some models, the resonant frequency of the bottom surface of the 820 housing can be determined based on the material of the bottom surface of the 820 housing. In some models, the material and thickness of the bottom surface of the 820 housing can affect the resonant frequency of the bottom surface of the 820 housing. For example, if the material of the bottom surface of the 820 housing is relatively soft, the resonant frequency of the bottom surface of the 820 housing may be -38 relatively low. Conversely, if the material of the lower surface of the 820 housing is relatively hard, the resonant frequency of the lower surface of the 820 housing can be relatively high. The resonant frequency of the lower surface of the 820 housing can be equal to or less than a threshold, such as equal to or less than 10 kHz, or equal to or less than 5 kHz, or equal to or less than 1 kHz, etc., by adjusting the hardness of the material of the lower surface of the 820 housing. In some embodiments, the resonant frequency of the lower surface of the housing 820 can be determined based on the passive vibration diaphragm 833. For example, the resonant frequency of the lower surface of the housing 820 can be equal to the resonant frequency of the passive vibration diaphragm 833. In some configurations, the resonant frequency of the passive vibration diaphragm 833 may exceed the frequency of the structure comprising the magnetic circuit system 811 and the first vibration diaphragm 831. When the vibration frequency of the magnetic circuit system 811 is lower than the resonant frequency of the passive vibration diaphragm 833, the vibration of the passive vibration diaphragm 833 may be consistent with that of the housing 820. In other words, the vibration phase and frequency of the passive vibration diaphragm 833 may be consistent with those of the housing 820. The vibration of the passive vibration diaphragm 833 may be opposite to the vibration of the first vibration diaphragm 831.The air in the rear cavity 824 can be compressed or expanded, and aerotympanic conduction acoustic waves can form along the compression or expansion of the air in the rear cavity 824 when the frequency of the structure including the magnetic circuit system 811 and the first vibration diaphragm 831 is lower than the resonant frequency of the passive vibration diaphragm 833. And the phase of the sound leakage caused by the vibration of the passive vibration diaphragm 833 can be opposite to the phase of the sound leakage caused by the upper surface of the housing 820 where the vibration plate 812 is located when the upper surface of the housing 820 vibrates and presses against the surface caused by the vibration plate 812.The sound leakage caused by the vibration of the passive vibration diaphragm 833 and the sound leakage caused by the upper surface of the housing 820 can be canceled, suppressed or reduced, thus eliminating the sound leakage of the acoustic output device 800. When the vibration frequency of the circuit system. The magnetic frequency of the passive vibration diaphragm 833 is greater than the resonant frequency of the passive vibration diaphragm 833. The vibration amplitude of the passive vibration diaphragm 833 in relation to the housing 520 can be very small, and the amplitude of the compressed air by the passive vibration diaphragm 833 can be very small, so the sound leakage generated by the passive vibration diaphragm 833 can also be very small. Figure 9 is a schematic diagram illustrating an acoustic output device according to some of the modalities described herein. The acoustic output device 900 may be the same as or similar to the acoustic output device 600 of Figure 6. For example, the acoustic output device 900 may include a bone conduction unit 910, a housing 920, and an aerotympanic conduction unit. The bone conduction unit 910 and the aerotympanic conduction unit may be housed together in the same housing 920. As another example, the bone conduction unit 910 may include a magnetic circuit system 911, one or more vibrating plates 912, and a voice coil 913.As another example, a sound outlet 921 and a sound tube 940 may be arranged in a wall of the housing 920 and in flow communication with a rear cavity 924, and a decompression orifice 922 may be arranged in the wall of the housing 920 and in flow communication with a front cavity 923. As yet another example, the aerotympanic conduction installation may include a vibration diaphragm 931. The vibration diaphragm 931 may be the same as or similar to the vibration diaphragm 531 as described in Figure 5. Further descriptions of the components in the acoustic outlet device 900 may be found elsewhere in this exposition (e.g., Figures 5 and 6 and their descriptions). As shown in Figure 9, unlike the acoustic output device 600, the vibration diaphragm 931 can be separated from the magnetic circuit system 911, and the vibration diaphragm 931 can be physically connected to the housing 920. The vibration of the housing 920, caused by the vibration of the bone conduction unit 910 when the bone conduction unit 910 generates bone conduction acoustic waves, can drive the vibration of the vibration diaphragm 931. When the vibration diaphragm 931 has a smaller resonance peak (e.g., the vibration diaphragm 931 is made of a softer material, or the vibration diaphragm 931 is provided with a wrinkled structure that reduces its hardness), the vibration diaphragm 931 -40 may have a better response to the low-frequency vibration generated by the 920 housing. In other words, the 931 vibration diaphragm can provide more low-frequency sounds, thus increasing the volume of the low-frequency aerotympanic conduction acoustic waves. Figure 10 is a schematic diagram illustrating an acoustic output device according to some modalities of the present disclosure. The acoustic output device 1000 may be the same as or similar to the acoustic output device 500 of Figure 5 or the acoustic output device 800 of Figure 8. For example, the acoustic output device 1000 may include a bone conduction unit 1010, a housing 1020, and an aerotympanic conduction unit. The bone conduction unit 1010 and the aerotympanic conduction unit may be housed together in the same housing 1020. As another example, the bone conduction unit 1010 may include a magnetic circuit system 1011, one or more vibrating plates 1012, and a voice coil 1013.As another example, a sound outlet 1021 and a sound tube 1040 may be arranged in a wall of housing 1020 and in flow communication with a rear cavity 1024, and a decompression orifice 1022 may be arranged in the wall of housing 1020 and in flow communication with a rear cavity 1024. Further descriptions of the components in the acoustic outlet device 1000 may be found elsewhere in this exposition (e.g., Figures 5 and 6 and their descriptions). As yet another example, the aerotympanic conduction installation may include a first vibrating diaphragm 1031 and a second vibrating diaphragm 1033. The first vibrating diaphragm 1031 may be the same as or similar to the vibrating diaphragm 531 as described in Figure 5. The second vibrating diaphragm 1033 may be the same as or similar to the second vibrating diaphragm 833 as described in Figure 8. As shown in Figure 10, unlike the acoustic output device 800, the second vibrating diaphragm 1033 can be located in the rear cavity 1024 of the housing 1020, which is separated from the lower surface of the housing 1020. Furthermore, the second vibrating diaphragm 1033 can be located between a plane where the sound output 1021 is located along a direction parallel to the first vibrating diaphragm 1031 and the first vibrating diaphragm 1031. In some embodiments, the second vibrating diaphragm 1033 can be arranged parallel to the first vibrating diaphragm 1031. In some embodiments, the second vibrating diaphragm 1033 can be arranged obliquely. MA / a / ZUZZ / UI 11 / Z - 41 with respect to the first vibration diaphragm 1031. In some embodiments, the second vibration diaphragm 1033 can divide the rear cavity 1024 into a first sub-cavity and a second sub-cavity. The first sub-cavity can be defined by the second vibration diaphragm 1033 and the first vibration diaphragm 1031, and the second sub-cavity can be defined by the second vibration diaphragm 1033 and the lower surface of the housing 1020. In some configurations, vibration of housing 1020 caused by vibration of the bone conduction unit 1010 can cause a pressure change in the first sub-cavity between the first vibration diaphragm 1031 and the second vibration diaphragm 1033, as the magnetic circuit system 1011 and the first vibration diaphragm 1031 are immobilized relative to housing 1020. The pressure change in the first sub-cavity can cause air vibrations in the first sub-cavity. The air vibration in the first sub-cavity can cause vibration of the second vibration diaphragm 1033. The vibration of the second vibration diaphragm 1033 can cause air vibration in the second sub-cavity, and vibration of housing 1020 can also cause air vibrations in the second sub-cavity.The phase of the air vibration caused by the vibration of the second vibration diaphragm 1033 and the phase of the air vibration caused by the vibration of the housing 1020 may be the same, which may increase the volume of the aerotympanic conduction acoustic waves coming out of the sound outlet 1021. The vibration of housing 1020 caused by the vibration of the bone conduction unit 1010 can drive the vibration of the first vibration diaphragm 1031. The vibration of the first vibration diaphragm 1031 and / or housing 1020 can promote air vibration between the first vibration diaphragm 1031 and the second vibration diaphragm 1033, and the air vibration between the first vibration diaphragm 1031 and the second vibration diaphragm 1033 and the vibration of housing 1022 can drive the vibration of the second vibration diaphragm 1033. When the second vibration diaphragm 1033 has a smaller resonance peak (e.g., the second vibration diaphragm 1033 is made of a softer material, or the passive vibration diaphragm 1033 is provided with a wrinkled structure that reduces its hardness), the second vibration diaphragm 1033 may have a better response to air vibration between the first vibration diaphragm 1031 and the second diaphragm. - 42 vibration 1033 caused by the low-frequency vibration generated by the bone conduction unit 1010. In other words, the second vibration diaphragm 1033 can provide more low-frequency sounds, thus increasing the volume of the low-frequency aerotympanic conduction acoustic waves. The acoustic output device 1000 can provide a rich sound (e.g., lower-frequency sound), which can increase the volume of the aerotympanic conduction acoustic waves. Figure 11 is a schematic diagram illustrating an acoustic output device according to some modalities of this disclosure. As shown in Figure 11, the acoustic output device 1100 may include a bone conduction unit 1110, a housing 1120, and an aerotympanic conduction unit. The bone conduction unit 1110 may be the same as, or similar to, the bone conduction unit 510 of the acoustic output device 500 in Figure 5. For example, the bone conduction unit 1110 may include a magnetic circuit system, one or more vibrating plates 1112, and a voice coil 1113. Further descriptions of the components of the bone conduction unit 1110 in the acoustic output device 1100 can be found elsewhere in this disclosure (e.g., Figure 5 and its accompanying descriptions).The acoustic outlet device 1100 may further include a sound outlet 1121 arranged in the housing 1120 and in flow communication with the cavity of the housing 1120 and a decompression hole 1122 may be arranged in the wall of the housing 1120 and in flow communication with the cavity of the housing 1120. As shown in Figure 11, unlike the acoustic output device 500, the aerotympanic conduction installation may include a vibration diaphragm 1133 and a vibration transmission installation 1131. The vibration transmission installation 1131 may be physically connected to the bone conduction installation 1110, the vibration diaphragm 1133, and / or the housing 1120. The vibration transmission installation 1131 may be configured to transfer vibration from the bone conduction installation 1110 and / or the housing 1120 to the vibration diaphragm 1133 to generate aerotympanic conduction acoustic waves. The direction of vibration of the bone conduction installation 1110 and / or the housing 1120 may be changed by the vibration transmission installation 1131 during vibration transmission. In other words, the direction of vibration of the diaphragm of -43vibration 1133 may be different from the vibration direction of the bone conduction installation 1110 and / or the housing 1120. In some configurations, the vibration diaphragm 1133 may be located at the sound outlet 1121. The vibration diaphragm 1133 and the magnetic circuit system lili may be connected via the vibration transmission assembly 1131, and the magnetic circuit system lili may be connected to the housing 1120 via the vibration transmission assembly 1131. The vibration transmission assembly 1131 may include multiple connecting rods. For example, one of the connecting rods may be physically connected to the vibration diaphragm 1133, one of the connecting rods may be physically connected to the magnetic circuit system lili, one of the connecting rods may be physically connected to the housing 1120, and the connecting rods may be physically connected to each other. The vibration transmission unit 1131 can change the vibration direction of housing 1120 and transmit the vibration from housing 1120, with the changed vibration direction, to the vibration diaphragm 1133. For example, in Figure 11, housing 1120 can vibrate in left and right directions relative to the magnetic circuit system, thereby generating bone conduction acoustic waves. Housing 1120 can transmit the vibration from the magnetic circuit system to the human cochlea through its upper surface and then through the human bones.The vibration transmission unit 1131 can convert the left and right vibration directions of the housing 1120 into up and down vibrations and transmit these vibrations to the vibration diaphragm 1133, enabling the diaphragm 1133 to vibrate up and down, thereby generating aerotympanic conduction acoustic waves. In some configurations, the sound output 1121 can be directed directly toward the human ear, meaning the vibration diaphragm 1133 vibrates in the direction of the human ear. Figure 12 is a schematic diagram illustrating an acoustic output device according to some modalities of the present disclosure. The acoustic output device 1200 may be the same as or similar to the acoustic output device 600 of Figure 6. For example, the acoustic output device 1200 may include a bone conduction unit 1210, a housing 1220, and iviA / a / zuzz / u ι 11 / z - 44 an aerotympanic conduction installation. The bone conduction unit 1210 and the aerotympanic conduction unit may be housed together in the same housing 1220. As another example, the bone conduction unit 1210 may include a magnetic circuit system 1211, one or more vibrating plates 1212, and a voice coil 1213. The aerotympanic conduction unit may include a vibrating diaphragm 1231. As a further example, a sound outlet 1221 and a sound tube 1240 may be arranged in the housing 1220 and in flow communication with a rear cavity 1224, and a decompression orifice 1222 may be arranged in the side wall of the housing 1220 and in flow communication with a front cavity 1223. Further descriptions for the components of the acoustic outlet device 1200 may be found elsewhere in this exposition (e.g., Figures 5 and 6 and their descriptions). As shown in Figure 12, unlike the acoustic output device 600, the acoustic output device 1200 may also include an elastic member 1250 (also called a vibration transmission plate) provided between the magnetic circuit system 1211 and the housing 1220. Specifically, the elastic member 1250 may be located in the front cavity 1223, and the elastic member 1250 may physically connect the magnetic circuit system 1211 and the housing 1220. The elastic member 1250 may have a better fixing effect on the magnetic circuit system 1211 and prevent the magnetic circuit system 1211 from rotating during vibration of the housing 1220, thereby improving the sound quality effect of the acoustic output device 1200. Furthermore, the elastic member 1250 may have a certain resonant frequency, which provides a resonant peak for the vibration of the housing 1220, such that the bone conduction acoustic waves generated by the bone conduction unit 1210 may have a greater volume near the resonant peak of the elastic member 1250. In some embodiments, by adjusting one or more characteristics of the vibration diaphragm 1231 (e.g., dimensions, elastic modulus of the material, edges, and other special mechanical characteristics) and an elastic coefficient of the elastic member 1250, the output characteristic of the bone conduction acoustic waves can be adjusted. It should be noted that the elastic member 1250 in this embodiment is not limited to the scope of this document and is also applicable to the acoustic output device shown in other drawings of this document. Figure 13 is a schematic diagram illustrating an acoustic output device according to some modalities of the present disclosure. The acoustic output device 1300 may be the same as or similar to the acoustic output device 600 of Figure 6. For example, the acoustic output device 1300 may include a bone conduction unit 1310, a housing 1320, and an aerotympanic conduction unit. As another example, the bone conduction unit 1310 may include a magnetic circuit system 1311, one or more vibrating plates 1312, and a voice coil 1313. The aerotympanic conduction unit may include a vibrating diaphragm 1331.As a further example, a sound outlet 1321 and a sound tube 1340 can be arranged in the housing 1320 and in flow communication with a rear cavity 1324, and a decompression orifice 1322 can be arranged in the housing 1320 and in flow communication with a front cavity 1323. Further descriptions of the components in the acoustic outlet device 1300 can be found elsewhere in this exposition (e.g., Figures 5 and 6 and their descriptions). As shown in Figure 13, unlike the acoustic outlet device 600, the housing 1320 may be provided with at least one vent hole 1326 (also called a third hole). In some embodiments, the vent hole 1326 may be located in a side wall not adjacent to a side wall of the housing where the sound outlet 1321 is located. In some embodiments, the vent hole 1326 may be located in one or more side walls adjacent to the side wall where the sound outlet 1321 is located. For example, the housing 1320 may include at least four side walls physically connected in sequence. The sound outlet 1321 may be arranged in a first side wall, and the decompression hole 1322 may be arranged 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 1326 clearance hole can be located in the second side wall, a third side wall, a fourth side wall, etc. The third and fourth side walls can be adjacent to the first side wall. The size (e.g., the area) can range from 1 to 50 square millimeters, or from 5 to 30 square millimeters, or from 10 to 20 square millimeters, etc. In some forms, the 1326 clearance hole may be located on a side wall opposite the side wall of the housing where the ινΐΛ / a / zuzz / ui 11 is located -46 Sound outlet 1321 to increase the air resonance frequency in the rear cavity 1324 and / or the front cavity 1323. In some modes, the air resonance frequencies in the rear cavity 1324 and the front cavity 1323 may be the same. In some modes, the air resonance frequencies in the rear cavity 1324 and / or the front cavity 1323 may be equal to or greater than 4000 Hz, or equal to or greater than 5000 Hz, etc. In some modes, the air resonance frequency in the rear cavity 1324 may be in the range of 5500 Hz to 6000 Hz, or in the range of 4000 Hz to 6000 Hz, etc. In some modalities, the resonance frequency of the air in the front cavity 1323 may be in a range of 4500 Hz to 5000 Hz, or in a range of 4000 Hz to 5000 Hz, etc.The air resonance frequencies in the rear cavity 1324 and in the front cavity 1323 can be adjusted as described in Figure 4 and its descriptions. In some embodiments, the bleed port 1326 and / or the decompression port 1322 may be through ports. In some embodiments, the bleed port 1326 and / or the decompression port 1322 may not be through ports. The bleed port 1326 and / or the decompression port 1322 may be in flow communication with the outside of the acoustic output device via the sound outlet 1321 or the sound tube 1340. As a further example, the housing 1320 may include a channel (or communication tube). The channel can be connected to the sound outlet 1321 and the sound tube 1340. Air in the front cavity 1323 and / or the rear cavity 1324 can flow from the front cavity 1323 and / or the rear cavity 1324 through the decompression hole 1322 and / or the purge hole 1326, the channel to the outside through the sound outlet 1321 and the sound tube 1340. In some models, the bleed hole 1326 and / or the decompression hole 1322 may be through holes. At least one of the second or third holes may be covered with a sound-resistance material, such as cotton. The sound-resistance material may have a sound resistance range of 5 to 500 MKS ralys, 10 to 260 MKS ralys, 20 to 200 MKS ralys, etc. Aerotympanic conduction sound waves (also called original aerotympanic conduction sound waves) generated by the aerotympanic conduction installation may collide with the lower surface of the housing - 47 1320 and be reflected by the lower surface of housing 1320 during the transmission process. The reflected air-to-ear conduction sound waves and the original air-to-ear conduction sound waves can form standing waves, resulting in distortion of the sound output at sound outlet 1321. In this embodiment, by arranging the debugging hole 1326 in housing 1320, a portion of the air-to-ear conduction sound waves can be emitted directly from the debugging hole 1326, preventing the portion of the air-to-ear conduction sound waves from being reflected and forming standing waves with the original air-to-ear conduction sound waves. In some embodiments, housing 1320 may also include a communication tube (not shown) to connect the front cavity 1323 and the rear cavity 1324. For example, the communication tube may be arranged between the decompression port 1322 and the purge port 1326. The sound output from one end of the communication tube in the front cavity 1323 may be in the opposite phase to the sound output from the other end of the communication tube in the rear cavity 1324, which may cancel each other out, thus achieving a better effect in reducing sound leakage. In some configurations, the decompression hole 1322 may be provided with a damping structure (e.g., a tuning grid). The damping structure provided for the decompression hole 1322 may be configured to improve acoustic resistance and adjust (e.g., decrease) the amplitude of the acoustic waves leaking from the decompression hole 1322. In some configurations, to increase the sound output volume through the sound tube 1340 and reduce the sound leakage volume at the bleed hole 1326, a damping structure (e.g., a tuning grid) may be provided at the bleed hole 1326. The damping structure provided for the bleed hole 1326 can be configured to improve acoustic resistance and adjust (e.g., decrease) the amplitude of the acoustic waves leaking from the bleed hole 1326. When the amplitude of the acoustic waves leaking from the bleed hole 1326 and the amplitude of the acoustic waves leaking from the decompression hole 1322 are equal, the acoustic waves leaking from the bleed hole 1326 and the acoustic waves leaking from the decompression hole 1322 can cancel each other out, which can reduce MA / a / ZUZZ / UI 11 / Z -48 sound leakage, improving the sound output volume of the 1340 sound tube. It should be noted that the bleed port 1326 in this configuration is not limited to the configuration shown in Figure 13, and may also apply to Figures 5-12 and the configuration shown in Figure 13 or similar acoustic outlet devices. In some configurations, the numbers of the bleed ports and the decompression ports may be the same or different. Figure 14 and Figure 15 are cross-sectional views of vibration diaphragms according to some modalities of this disclosure. As shown in Figure 14, the vibration diaphragm 1400 may include a main portion 1410 and an extension portion 1420. The main portion 1410 may include a base plate and a side wall. The base plate and side wall may form a space that can be configured to house at least a portion of a magnetic circuit system as described elsewhere in this disclosure. The extension portion 1420 may be level with the top of the main portion 1410 (e.g., the top of the side wall of the main portion 1410), and the extension portion 1420 may have a concave area 1421 that curves towards the base plate of the main portion 1410. In some embodiments, an elastic coefficient of the vibration diaphragm 1400 may be adjusted by adjusting the characteristics of the vibration diaphragm 1400, such as the height of the main portion 1410, the height of the extension portion 1420 relative to the main portion 1410, the height of the concave area 1421, the thickness of the main portion 1410 and / or the extension portion 1420, etc. For example, the greater the height of the concave area 1421, the smaller the thickness of the extension of portion 1420, and the greater the number of concave areas, the greater the elastic coefficient of the vibration diaphragm 1400 can be. The vibration diaphragm 1500, as shown in Figure 15, may be similar to the vibration diaphragm 1400, as shown in Figure 14. For example, the vibration diaphragm 1500 may include a main portion 1510 and an extension portion 1520. Unlike the vibration diaphragm 1400, the extension portion 1520 may have a concave area 1521 that protrudes from the base plate of the main portion 1510. In some embodiments, the elastic coefficient of the vibration diaphragm 1500 can be adjusted by modifying features of the vibration diaphragm 1500, such as the height of the extension portion. MA / a / ZUZZ / UI 11 / Z -49main 1510, the height of the extension portion 1520 with respect to the main portion 1510, the height of the concave area 1521, the thickness of the main portion 1510 and / or the extension portion 1520, etc. For example, the greater the height of the concave area 1521, the less the thickness of the extension portion 1520, and the greater the number of convex areas, the greater the elastic coefficient of the vibration diaphragm 1500. Comparing the 1400 vibration diaphragm shown in Figure 14 and the 1500 vibration diaphragm shown in Figure 15, the 1400 vibration diaphragm may have a smaller elastic coefficient and a lower low-frequency resonant frequency than the 1500 vibration diaphragm when both are made of the same material. In some embodiments, the 1420 extension portion of the 1400 vibration diaphragm and the 1520 extension portion of the 1500 vibration diaphragm may be provided with holes (not shown). The holes may be through-holes, and the first and second cavities of the housing for an acoustic output device, as described elsewhere in this discussion, may be in flow communication through the holes.Since the sounds generated at both ends of the holes are in opposite phase and cancel each other out, the sound leakage generated by the acoustic outlet device (e.g., sound leakage from the decompression hole) can be effectively reduced. The 1500 vibration diaphragm and the 1500 vibration diaphragm provided in this modality can be applied to the aforementioned acoustic outlet device (e.g., the acoustic outlet device shown in Figures 5-13), thereby improving the sound output effect of the acoustic outlet device and reducing sound leakage. Figure 16 is a schematic diagram of different positions relative to an acoustic output device according to some of the modalities discussed herein. As shown in Figure 16, four positions relative to an acoustic output device are indicated by points pl, p2, p3, and p4. Pl is located in a position that is close to the user's skin when the user is using the acoustic output device. Pl can also be referred to as the front side of the acoustic output device. P3 is located in a position that is far from the user's skin when the user is using the acoustic output device. P3 can also be referred to as the back side of the acoustic output device. P2 is located in a position close to - 50 a sound tube as described elsewhere in this exhibit. P4 is located in a position close to a decompression hole as described elsewhere in this exhibit. Figures 17-21 are schematic diagrams of leakage frequency response curves for different positions relative to various acoustic output devices, as described in Figure 16, according to some of the modalities of this exposition. A leakage frequency response curve of an acoustic output device refers to a curve that represents the variation of sound leakage from the acoustic output device along with the frequency of a sound signal. The horizontal axis can represent the frequency of the sound signal introduced into the acoustic output device. The vertical axis can represent the volume of sound leakage from the acoustic output device at a given position (e.g., p1, p2, p3, p4).The leakage frequency response curves L1–L4, as shown in each of Figures 17–21, represent variations in the sound leakage of the acoustic output device at positions pl–p4, respectively, along with the frequency of a sound signal. The leakage frequency response curves S1–S5, as shown in each of Figures 22–25, represent variations in the sound leakage of different acoustic output devices at positions pl–p4, respectively, along with the frequency of a sound signal. As shown in Figure 17, the L1-L4 leakage frequency response curves are provided for a first acoustic outlet device comprising a sound tube and a decompression port arranged in two opposite side walls of the acoustic outlet device housing. The first acoustic outlet device may be the same as or similar to acoustic outlet device 600 as described in Figure 6. As shown in Figure 18, the L1-L4 leakage frequency response curves are provided for a second acoustic output device that includes a sound tube and a decompression hole arranged in two opposite side walls of the acoustic output device housing. The second acoustic output device further includes at least one bleed hole arranged in the side wall where the decompression hole is located. The second acoustic output device may be the same as or similar to acoustic output device 1300 as described in Figure 13. As shown in Figure 19, the response curves are provided for - 51 L1-L4 leakage frequency of a third acoustic output device including a sound tube and a decompression hole arranged in two opposite side walls of the acoustic output device housing. The third acoustic output device further includes at least one bleed hole arranged in the side wall where the decompression hole is located. The third acoustic output device may be the same as or similar to acoustic output device 1300 as described in Figure 13. Unlike the second acoustic output device, the rear cavity volume of the third acoustic output device is smaller than that of the second acoustic output device. As shown in Figure 20, the L1-L4 leakage frequency response curves are provided for a fourth acoustic outlet device that includes a sound tube and a decompression hole arranged in two opposite side walls of the acoustic outlet device housing. The fourth acoustic outlet device further includes at least one bleed hole arranged in the side wall where the decompression hole is located. The fourth acoustic outlet device may be the same as or similar to acoustic outlet device 1300 as described in Figure 13. Unlike the second acoustic outlet device, the sound tube and the decompression hole are in flow communication with the bleed hole. In other words, the decompression hole and the bleed hole are not through holes. As shown in Figure 21, the L1-L4 leakage frequency response curves are provided for a fifth acoustic outlet device that includes a sound tube and a first decompression hole arranged in two opposite side walls of the acoustic outlet device housing. The fourth acoustic outlet device further includes at least one bleed hole arranged in the side wall where the first decompression hole is located. The fourth acoustic outlet device may be the same as or similar to acoustic outlet device 1300 as described in Figure 13. The sound tube and the first decompression hole are in flow communication with the bleed hole. In other words, the first decompression hole and the bleed hole are not through holes.Unlike the fourth acoustic outlet device, the fifth acoustic outlet device also includes a second decompression hole. - 52 on the side wall where the first decompression hole is located. The second decompression hole is a through hole. Figures 22–25 are schematic diagrams showing a comparison of the leakage frequency response curves of different acoustic output devices at the same position as described in Figure 16, according to some of the modalities of this presentation. As shown in Figure 22, the leakage frequency response curves S1–S5 at position pl are provided for the first acoustic output device, the second acoustic output device, the third acoustic output device, the fourth acoustic output device, and the fifth acoustic output device, as described in Figures 17–21.As shown in Figure 23, the leakage frequency response curves S1-S5 are provided at position p2 for the first acoustic output device, the second acoustic output device, the third acoustic output device, the fourth acoustic output device, and the fifth acoustic output device, as described in Figures 17-21. As shown in Figure 24, the leakage frequency response curves S1-S5 are provided at position p3 for the first acoustic output device, the second acoustic output device, the third acoustic output device, the fourth acoustic output device, and the fifth acoustic output device, as described in Figures 17-21.As shown in Figure 25, the S1-S5 leakage frequency response curves are provided at position p4 of the first acoustic output device, the second acoustic output device, the third acoustic output device, the fourth acoustic output device, and the fifth acoustic output device as described in Figures 17-21. According to Figures 17-19 and 21, it can be inferred that sound leakage at most frequencies above 1000 Hz is greater than at frequencies below 1000 Hz. According to Figure 17, the L1L4 leakage frequency response curves of the first acoustic output device, which does not include a debugging hole at different positions pl-p4, especially on the front side pl and the rear side p3, include a first peak and a second peak at frequencies of approximately 2000 Hz and 2200 Hz, respectively. The first peak at 2000 Hz is caused by the front cavity of the first acoustic output device, and the second peak at 2200 Hz is caused by the rear cavity. - 53 rear of the first acoustic output device. According to Figure 18, the leakage frequency response curves L1-L4 of the second acoustic output device, which includes a bleed hole in different positions (pipé), especially on the front (pl) and rear (p3) sides, include a first peak and a second peak at frequencies of approximately 2000 Hz and 4800 Hz. Comparing the leakage frequency response curves L1-L4 of the first and second acoustic output devices, it can be inferred that the bleed hole causes a second peak in the rear cavity at the higher frequency. Therefore, the bleed hole may increase the resonant frequency (i.e., peaks in the leakage frequency response curves L1-L4) of the air in the rear cavity.According to Figures 22-25, when comparing the SI leakage frequency response curve of the first acoustic output device and the S2 leakage frequency response curve of the second acoustic output device in each of Figures 22-25, the sound leakage of the second acoustic output device at position p2 (i.e., the position around the sound tube) is like the debugging hole, but the sound leakage of the second acoustic output device at other positions, such as pl, p3, and p4, obviously does not change. According to Figure 19, the L1-L4 leakage frequency response curves of the third acoustic output device, which includes a rear cavity with a lower volume than the second acoustic output device at different positions pl-p4, include two peaks at the frequencies. Comparing the L1-L4 leakage frequency response curves of the second and third acoustic output devices, it can be inferred that the second peak in Figure 18, caused by the rear cavity, shifts toward the higher frequency as the rear cavity's volume decreases, as shown in Figure 19. According to Figures 22-25, comparing the response curve o.The leakage frequency S2 of the second acoustic output device and the leakage frequency response curve S3 of the third acoustic output device at each position of pl, p2, p3 and p4, the sound leakage of the third acoustic output device at each position of pl, p2, p3 and p4 does not obviously change as the lower volume of the rear cavity. According to Figure 20, the LlL4 leakage frequency response curves of the fourth acoustic outlet device include the sound tube, the decompression orifice, and the debugging orifice in the flow communication -54 include a first peak at a frequency of 700 Hz and a second peak at a frequency above 1000 Hz. Comparing the leakage frequency response curves L1-L4 of the fourth acoustic output device and the fifth acoustic output, it can be inferred that the first peak in Figure 20 shifts towards the lower frequency, which is caused by the larger volume of a cavity since the front and rear cavities are in flow communication. According to Figures 22-25, when comparing the leakage frequency response curve S4 of the fourth acoustic output device and the leakage frequency response curve S5 of the fifth acoustic output device, the sound leakage from the fourth acoustic output device is found at positions p2 and p4 (i.e., the positions in the sound tube and the decompression are obviously reduced, especially in the low-mid frequencies). According to Figure 21, the leakage frequency response curves L1-L4 of the fifth acoustic output device, which includes the sound tube, the first decompression port, the second decompression port, and the purge port in flow communication, include a first peak and a second peak. Comparing the leakage frequency response curves L1-L4 of the second acoustic output device and the fifth acoustic output, it can be inferred that the second peak in Figure 21 shifts toward the higher frequency. According to Figures 22-25, when comparing the leakage frequency response curve S2 of the second acoustic output device and the leakage frequency response curve S5 of the fifth acoustic output device, the sound leakage of the fifth acoustic output device does not obviously change at position p2 (i.e.,, around the sound tube) in relation to the second acoustic output device, but obviously decreases at position p4 (i.e., around the second decompression hole) in relation to the second acoustic output device. The basic concepts have been described above. Obviously, for those skilled in the art, the detailed exposition above is merely an example and does not constitute a limitation of this exposition. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and amendments to this exposition. Such alterations, improvements, and modifications are intended to be suggested by this exposition and are within the spirit and scope of its exemplary forms. In addition, certain terminology has been used to describe modalities of the - 55 present exposition. For example, a modality, the modality, and / or some modalities signify a certain feature, structure, or characteristic related to at least one modality of the present exposition. Therefore, it should be emphasized and pointed out that a modality, the modality, or an alternative modality mentioned two or more times in different positions in this specification does not necessarily refer to the same modality. Furthermore, some features, structures, or characteristics of the present exposition of one or more modalities may appropriately be combined. Furthermore, those skilled in the art may understand that various aspects of this disclosure can be explained and described through a number of patentable categories or situations, including any new and useful process, machine, product, or combination of substances, or any new and useful improvement thereof. Accordingly, all aspects of this disclosure may be implemented entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. The aforementioned hardware or software may be referred to as a data block, module, processor, unit, component, or system. In addition, aspects of this disclosure may appear as a computer product located on one or more computer-readable media, including computer-readable program code. The computer storage medium can contain a propagated data signal that carries computer program code, for example, in a baseband or as part of a carrier wave. The propagating signal can take multiple forms, including electromagnetic, optical, and other forms, or a suitable combination thereof. The computer storage medium can be any computer-readable medium other than a computer-readable storage medium, and the medium can be connected to a system, device, or instruction-execution device to perform communication, propagation, or transmission of the program for use. The program code located on the computer storage medium can be transmitted through any suitable medium, including radio, cable, fiber optic cable, wireless, or a similar medium, or any combination thereof. The computer program codes necessary for the operation of each part of this exhibition may be written in one or more languages ​​of - 56 Programming, including object-oriented programming languages ​​such as Java, Scala, Smalltalk, Eiffel, JADE, Emerald, and C. The program code may run entirely on the user's computer, or as a standalone software package on the user's computer, or partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server. In the latter case, the remote computer may connect to the user's computer via any form of network, such as a local area network (LAN) or a wide area network (WAN), or connect to an external computer (e.g., via the Internet), or in a cloud computing environment, or as a Software as a Service (SaaS) delivery model. Furthermore, unless explicitly stated in the claims, the order of elements and processing sequences, the use of numbers and letters, or the use of other names herein are not intended to limit the order of the procedures and methods herein. Although the foregoing discusses through various examples what are currently considered a variety of useful embodiments of the embodiment, it should be understood that such detail is solely for that purpose, and that the appended claims are not limited to the embodiments set forth, but rather are intended to cover modifications and equivalent arrangements that fall within the spirit and scope of the embodiments described. For example, although the implementation of several components described above may be incorporated into a hardware device, it may also be implemented as a software-only solution, e.g., an installation on an existing server or mobile device. Similarly, it should be noted that, in the preceding exposition of the embodiments of this exposition, several features are sometimes grouped into a single embodiment, figure, or representation thereof in order to simplify the exposition and aid in understanding one or more of the various embodiments. However, this exposition does not imply that the subject matter of this exposition requires more features than those mentioned in the claims. Rather, the claimed subject matter may be less than all the features of a single embodiment described above. Some examples use numbers that describe the number of ingredients and attributes. It should be understood that such numbers used in the examples use the modifiers close to, approximately, or substantially. -57 Some examples. Retouch. Unless otherwise stated, near, approximately, or substantially indicate that the number is allowed to vary by ±20%. Correspondingly, in some embodiments, the numerical parameters used in the description and claims are approximate values, and the approximate values ​​may be changed according to the required features of the individual embodiments. In some embodiments, the numerical parameter must consider the prescribed effective digits and adopt a general method of digit retention. Although the ranges and numerical parameters used to confirm the range amplitude in some embodiments of the present disclosure are approximate values, in specific embodiments, the setting of such numerical values ​​is as precise as possible within the feasible range. For each patent, patent application, patent application publication, and other materials cited herein, such as articles, books, specifications, publications, documents, etc., the full content of which is incorporated herein by reference, the following documents are included: Application history documents that are inconsistent with or conflict with the content of this document, and documents that restrict the broader scope of the claims herein (attached now or subsequently to this document). It should be noted that if any inconsistency or conflict exists between the description, definition, and / or use of a term in the materials attached to this document and the content described herein, the description, definition, and / or use of the term in this document shall prevail. Finally, it should be understood that the modalities described herein are merely illustrative of the principles of the modalities presented herein. Other modifications may be employed that fall within the scope of this exposition. Therefore, by way of example, but not limitation, alternative configurations of the modalities presented herein may be used in accordance with its teachings. Consequently, the modalities of this exposition are not limited to those explicitly introduced and described herein.

Claims

1. An apparatus for outputting audio signals, comprising: a bone conduction unit configured to generate a bone conduction acoustic wave; an aerotympanic conduction unit configured to generate an aerotympanic conduction acoustic wave, wherein the bone conduction acoustic wave and the aerotympanic conduction acoustic wave represent the same audio signal, and the phase difference between the bone conduction acoustic wave and the aerotympanic conduction acoustic wave is less than a threshold; and a housing configured to house at least a portion of the bone conduction unit and the aerotympanic conduction unit.

2. The apparatus of claim 1, wherein the bone conduction installation includes: a magnetic circuit installation configured to generate a magnetic field; one or more vibrating plates connected to the housing; and a voice coil connected to at least one of the one or more vibrating plates, wherein the voice coil vibrates in the magnetic field in response to the reception of the audio signal, and causes one or more vibrating plates to vibrate to generate the bone conduction acoustic waves.

3. The apparatus of claim 1 or claim 2, wherein the aerotympanic conduction acoustic wave is generated based on a vibration of at least one of the bone conduction installation or housing when the bone conduction installation generates the bone conduction acoustic wave.

4. The apparatus of claim 3, wherein the aerotympanic conduction installation includes: one or more vibration diaphragms physically connected to at least one of the bone conduction installation or housing, the aerotympanic conduction acoustic wave being generated based on one or more vibration diaphragms and the vibration of at least one of the bone conduction installation or housing.

5. The apparatus of claim 4, wherein the housing includes a space in which at least one of the one or more vibration diaphragms is located, the space including a first cavity and a second cavity defined by the at least one of the one or more vibration diaphragms, a first portion of the housing around the first cavity is physically connected to the bone conduction installation and configured to transfer a vibration from the bone conduction installation, and the aerotympanic conduction acoustic wave exits from the second cavity.

6. The apparatus of claim 5, wherein a second portion of the housing around the second cavity is configured with one or more first orifices in flow communication with the second cavity, and the aerotympanic conduction wave exits the first orifices through the one or more first orifices.

7. The apparatus of claim 6, wherein a sound tube is provided in each of the first one or more holes.

8. The apparatus of claim 6 or claim 7, wherein the first portion of the housing is configured with one or more second orifices in flow communication with the first cavity, and the one or more second orifices are configured to adjust the air pressure in the first cavity.

9. The apparatus of claim 8, wherein the first one or more holes are configured in a first side wall of the housing, the second one or more holes are configured in a second side wall of the housing, and the first side wall is substantially parallel to the second side wall.

10. The apparatus of claim 9, wherein the housing is configured with one or more third orifices in flow communication with at least one of the first cavity or the second cavity.

11. The apparatus of claim 10, wherein at least one of the one or more second holes or one or more third holes is covered by an acoustic resistance material.

12. The apparatus of claim 10 or claim 11, wherein at least one of the one or more third holes is configured in the second side wall of the housing.

13. The apparatus of any of claims 10 to 12, wherein at least one of the one or more third holes is configured with a damping structure.

14. The apparatus of any of claims 4 to 13, wherein at least one of the one or more vibration diaphragms includes: a main portion physically connected to the bone conduction installation, the main portion including a base plate and a side wall forming a sub-space to house at least one portion of the bone conduction installation; and an auxiliary portion physically connected to the housing.

15. The apparatus of claim 14, wherein the auxiliary portion includes at least one of a concave area or a convex area.

16. The apparatus of any of claims 4 to 13, wherein at least one of the one or more vibration diaphragms includes an annular structure, an inner wall of the vibration diaphragm surrounds the bone conduction installation, and an outer wall of the vibration diaphragm is physically connected to the housing.

17. The apparatus of any of claims 4 to 13, wherein at least one of the one or more vibration diaphragms is located between the lower surface of the bone conduction installation and the lower surface of the housing.

18. The apparatus of any of claims 4 to 17, wherein the one or more vibration diaphragms includes a first vibration diaphragm physically connected to the bone conduction installation and a second vibration diaphragm physically connected to the housing.

19. The apparatus of claim 18, wherein the lower surface of the housing that is opposite the side wall of the housing that makes contact with a user when the user uses the apparatus, includes a resonance frequency below a threshold.

20. The apparatus of claim 3, wherein the aerotympanic conduction installation includes a vibration diaphragm and a vibration transmission installation, the vibration transmission installation being physically connected to the bone conduction installation and the vibration diaphragm, and the vibration transmission installation is configured to transfer the vibration from the bone conduction installation to the vibration diaphragm to generate the aerotympanic conduction acoustic wave.

21. The apparatus of claim 20, wherein the apparatus further includes a sound hole, the aerotympanic conduction wave exits through the sound hole, and the vibrating diaphragm is disposed in the sound hole.

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