Audio output device

Abstract

This specification discloses an acoustic output device. The acoustic output device may include at least one acoustic driver, a housing structure, and at least two sound guide holes. The at least one acoustic driver may output sounds out of phase with each other from the at least two sound guide holes. The housing structure may be configured to mount the at least one acoustic driver. The housing structure may include a user contact surface that contacts a user. When a user wears the acoustic output device, the user contact surface may contact the user's body. An included angle formed between a line connecting the at least two sound guide holes and the user contact surface may be within a range of 75° to 105°.

Description

Technical Field

[0001] This application relates to the field of acoustics, and particularly to an acoustic output device.

Background Art

[0002] An open-ear type acoustic output device is a portable audio output device that realizes acoustic conduction within a specific range. Compared with conventional in-ear earphones and headphones, the open-ear type acoustic output device has the characteristics of not blocking or covering the ear canal, and the user can obtain voice information in the external environment while listening to music, thus improving safety and comfort. Due to the use of an open-type structure, the sound leakage of the open-ear type acoustic output device is often more serious than that of conventional earphones. Currently, the open-ear type acoustic output device may have problems such as insufficient voice loudness and large sound leakage. Therefore, it is desirable to provide a more effective acoustic output device that can simultaneously achieve the effects of improving the listening volume of the user and reducing sound leakage.

Summary of the Invention

Means for Solving the Problems

[0003] The acoustic output device according to an embodiment of the present application includes at least one acoustic driver that generates a pair of sounds with opposite phases emitted from at least two sound conduction holes to the outside, and a housing structure configured to mount the at least one acoustic driver and including a user contact surface configured to contact the user's body when the user wears the acoustic output device, and an included angle formed by a line connecting the at least two sound conduction holes and the user contact surface is within a range of 75° to 90°.

[0004] In some embodiments, the at least two sound conduction holes include a first sound conduction hole and a second sound conduction hole, and a distance from the first sound conduction hole to the user contact surface is smaller than a distance from the second sound conduction hole to the user contact surface.

[0005] In some embodiments, the distance from the first sound duct to the user contact surface is 5 mm or less.

[0006] In some embodiments, the distance from the first sound duct to the user contact surface is 2 mm or less.

[0007] In some embodiments, the distance between the first sound conduit and the second sound conduit is 2 mm or less.

[0008] In some embodiments, the distance between the first sound conduit and the second sound conduit is 0.5 mm or less.

[0009] In some embodiments, the at least one acoustic driver includes a diaphragm and a magnetic circuit structure, wherein the side of the diaphragm facing away from the magnetic circuit structure forms the front of the acoustic driver, and the side of the magnetic circuit structure facing away from the diaphragm forms the back of the acoustic driver, and the vibration of the diaphragm causes the acoustic driver to emit sound from its front and back surfaces, respectively.

[0010] In some embodiments, the at least one acoustic driver includes a first acoustic driver comprising a first diaphragm and a second acoustic driver comprising a second diaphragm, wherein the sound generated by the vibration of the first diaphragm and the sound generated by the vibration of the second diaphragm are in opposite phases and are each emitted to the outside through the at least two sound ducts.

[0011] In some embodiments, at least two sound holes are fitted with attenuation layers.

[0012] In some embodiments, the damping layer is a metal screen or a gauze mesh.

[0013] Another embodiment of the present invention provides an acoustic output device comprising: at least one acoustic driver that generates a pair of sounds with opposite phases emitted to the outside from at least two sound holes; and a housing structure configured to mount the at least one acoustic driver and including a user contact surface configured to come into contact with the user's body when the user wears the acoustic output device, wherein the angle formed by the line connecting the at least two sound holes and the user contact surface is in the range of 0° to 15°.

[0014] In another embodiment, the at least two sound ducts include a first sound duct and a second sound duct, and the distance between the first sound duct or the second sound duct and the user contact surface is 5 mm or less.

[0015] The distance from the first sound guide hole or the second sound guide hole to the user contact surface is 2 mm or less.

[0016] In another embodiment, the distance between the first sound hole and the second sound hole is 2 mm or less.

[0017] In another embodiment, the distance between the first sound hole and the second sound hole is 0.5 mm or less.

[0018] In another embodiment, the at least one acoustic driver includes a diaphragm and a magnetic circuit structure, the side of the diaphragm facing away from the magnetic circuit structure forming the front of the acoustic driver, and the side of the magnetic circuit structure facing away from the diaphragm forming the back of the acoustic driver, and the vibration of the diaphragm causes the acoustic driver to emit sound to the outside from its front and back, respectively. In another embodiment, the at least one acoustic driver includes a first acoustic driver including a first diaphragm and a second acoustic driver including a second diaphragm, the sound generated by the vibration of the first diaphragm and the sound generated by the vibration of the second diaphragm are in opposite phases and are each emitted to the outside through the at least two sound ducts.

[0019] This application will be further described in the manner of exemplary embodiments, and these exemplary embodiments will be described in more detail with reference to the drawings. These embodiments are not limiting, and in these embodiments, the same numbers indicate the same structures.

Brief Description of the Drawings

[0020] [Figure 1] It is a schematic diagram showing two sound conduction holes, the user contact surface or the user's body part according to some embodiments of the present application. [Figure 2] It is a schematic diagram of a dipole according to some embodiments of the present application. [Figure 3] It is a principle diagram of a dipole according to some embodiments of the present application. [Figure 4] It is a schematic diagram showing the relative position of a dipole and the face area according to some embodiments of the present application. [Figure 5] [[ID=2O]]It is an equivalent principle diagram showing that the face area of the user according to some embodiments of the present application reflects the sound of the dipole. [Figure 6] It is a frequency response curve diagram when the distance d between two point sound sources of the acoustic output device according to some embodiments of the present application is different, and the distance D between the point sound source and the user's face area is different. [Figure 7] It is a sound field energy distribution diagram at 1000 Hz of two point sound sources according to some embodiments of the present application. [Figure 8] It is a schematic diagram showing the relative position of a dipole and the face area of the user according to some embodiments of the present application. [Figure 9] It is an equivalent principle diagram showing that the face area of the user according to some embodiments of the present application reflects the sound of the dipole. [Figure 10] It is a frequency response curve diagram when the distance d between two point sound sources of the acoustic output device according to some embodiments of the present application is different, and the distance D between the point sound source and the user's face area is different. [Figure 11] [ It is a sound field energy distribution diagram at 1000 Hz of two point sound sources according to some embodiments of the present application. [Figure 12]This is a sound pressure curve diagram showing the case where the angle between the line connecting two sound guide holes in some embodiments of the present application and the user contact surface or part of the user's body is different. [Figure 13] This is a schematic diagram of an acoustic output device according to several embodiments of the present invention. [Figure 14] This is a schematic diagram of another acoustic output device according to some embodiments of the present invention. [Figure 15] This is a schematic diagram of another acoustic output device according to some embodiments of the present invention. [Figure 16] This is a schematic diagram of an acoustic output device according to several embodiments of the present invention. [Figure 17] This is a schematic diagram of an acoustic output device according to several embodiments of the present invention. [Modes for carrying out the invention]

[0021] To more clearly illustrate the technical means of the embodiments of this application, the drawings necessary for describing the embodiments are briefly described below. Clearly, the drawings described below are merely some examples or embodiments of this application, and those skilled in the art can apply this application to other similar scenarios based on these drawings without requiring any creative effort. Unless otherwise evident from the language context or explicitly stated, the same reference numerals in the drawings indicate the same structure or operation.

[0022] It should be understood that the terms “system,” “apparatus,” “unit,” and / or “module” as used herein are methods for distinguishing various assemblies, elements, parts, sections, or assemblies of different levels. However, other terms may be used in place of the above terms if they can achieve the same purpose.

[0023] As used in this application and claims, unless the context explicitly indicates otherwise, terms such as “one,” “one,” “one kind,” and / or “the” do not specifically mean singular and may include plural forms. Generally, the terms “includes” and “contains” merely indicate the inclusion of clearly identified steps and elements, which are not an exclusive list, and the method or apparatus may include other steps or elements.

[0024] This application uses flowcharts to illustrate the operations performed by the system according to the embodiments of this application. It should be understood that the preceding and succeeding operations are not necessarily performed in exact order. Instead, each step may be performed in reverse order or simultaneously. Furthermore, other operations may be added to these processes, and one or more operations may be removed from these processes.

[0025] In some embodiments, the acoustic output device may include an acoustic driver and a housing structure. The acoustic driver is located inside the housing structure. Sound generated by at least one acoustic driver of the acoustic output device can be propagated to the outside by at least two sound ducts acoustically coupled with the acoustic driver. In some embodiments, the two sound ducts acoustically coupled with the same acoustic driver may be distributed on the same side of the user's head or face, in which case the user's head or face may be substantially considered a baffle, which can reflect the sound emitted from the two sound ducts. In space, the sound reflected by the baffle interferes with the sound directly emitted by the sound ducts, thereby altering the amplitude of the sound transmitted from the acoustic output device to a particular location. In some embodiments, by designing the distance or angle between the sound ducts and the user's head or face, the amplitude of sound generated by the acoustic output device in the surrounding environment can be reduced, thereby reducing sound leakage in the surrounding environment and preventing the sound generated by the acoustic output device from being heard by others near the user.

[0026] This application provides an acoustic output device. In some embodiments, the acoustic output device may be combined with products such as glasses, headphones, head-mounted displays, and AR / VR helmets, in which case the acoustic output device may be fixed near the user's ears by suspension or clamping. When the user wears the acoustic output device, it is located on at least one side of the user's head and is close to the user's ears but does not obstruct them. In some alternative embodiments, hooks may be installed on the outer surface of the acoustic output device, and the acoustic output device may be independently attached to the user's ears by the hooks, with the shape of the hooks conforming to the shape of the auricle. The acoustic output device used independently may be communicated with a signal source (e.g., a computer, mobile phone, or other mobile device) by wired or wireless (e.g., Bluetooth®). For example, both the left and right acoustic output devices may be directly communicated with a signal source by wireless means. For example, the left and right ear acoustic output devices may include a first output device and a second output device, the first output device may be able to communicate with a signal source, and the second output device may be able to wirelessly connect to the first output device wirelessly, and synchronization of audio playback is achieved between the first output device and the second output device by one or more synchronization signals. The wireless connection method includes, but is not limited to, Bluetooth®, local area network, wide area network, wireless personal area network, short-range wireless communication, or any combination thereof. The acoustic output device may be worn on the user's head (e.g., as an out-ear type open earphone worn in the form of glasses, a headband, or other structural means), or on another part of the user's body (e.g., the user's neck / shoulder / face area), or positioned near the user's ears in another manner (e.g., held by the user). At the same time, the acoustic driver may be positioned close to the ear canal but not blocking it, so that the user's ears remain open, and the user can hear not only the sound output from the acoustic output device but also the sounds of the external environment.For example, the sound output device may be mounted around or partially around the user's ear, and can transmit sound by air conduction or bone conduction.

[0027] An acoustic driver is an element that can receive an electrical signal, convert it into an audio signal, and output it. In some embodiments, distinguished by frequency, the types of acoustic drivers may include low-frequency (e.g., 30Hz-150Hz) acoustic drivers, mid-low-frequency (e.g., 150Hz-500Hz) acoustic drivers, mid-high-frequency (e.g., 500Hz-5kHz) acoustic drivers, high-frequency (e.g., 5kHz-16kHz) acoustic drivers, or full-frequency (e.g., 30Hz-16kHz) acoustic drivers, or any combination thereof. Naturally, low frequency, high frequency, etc., here only represent approximate frequency ranges, and different distinctions may be made in different application scenarios. For example, one crossover frequency may be determined, with low frequency representing the frequency range below the crossover frequency and high frequency representing frequencies above the crossover frequency. The crossover frequency may be any value within the range of human hearing, such as 500Hz, 600Hz, 700Hz, 800Hz, 1000Hz, etc. In some embodiments, distinguished according to their principle, the acoustic driver may further include, but is not limited to, drivers of the moving coil type, balanced armature type, piezoelectric type, electrostatic type, magnetostrictive type, etc. The acoustic driver may include a single diaphragm. When the diaphragm vibrates, sound can be emitted from the front and rear sides of the diaphragm, respectively, and the sound emitted from the front side of the diaphragm of the acoustic driver and the sound emitted from the rear side of the diaphragm of the acoustic driver have equal amplitude and opposite phase. In this case, when the sound emitted from the front and rear sides of the diaphragm of the acoustic driver is released to the outside through the corresponding sound guide holes, the sound from these two parts interferes during propagation, thereby reducing sound leakage at long distances from the acoustic output device. In some embodiments, the acoustic driver may include a diaphragm and a magnetic circuit structure, the diaphragm and the magnetic circuit structure being arranged sequentially along the direction of vibration of the diaphragm, and in some embodiments, the diaphragm may be mounted on a frame and then the frame may be fixed to the magnetic circuit structure. Alternatively, the diaphragm may be directly and fixedly connected to the side wall of the magnetic circuit structure.The side of the diaphragm facing away from the magnetic circuit structure forms the front of the acoustic driver, and the side of the magnetic circuit structure facing away from the diaphragm forms the back of the acoustic driver. The vibration of the diaphragm causes the acoustic driver to emit sound to the outside from its front and back surfaces, respectively. The acoustic driver may further include a voice coil. The voice coil may be fixed to the side of the diaphragm facing the magnetic circuit structure and may be located within the magnetic field formed by the magnetic circuit structure. When energized, the voice coil vibrates due to the action of the magnetic field and drives the diaphragm to vibrate, thereby generating sound. The vibration of the diaphragm causes the acoustic driver to emit sound to the outside from its front and back surfaces, respectively.

[0028] The housing structure may be a hollow, sealed or semi-sealed housing structure, and the acoustic driver is located inside the housing structure. The housing structure may have a shape that conforms to the human ear, such as annular, elliptical, (regular or irregular) polygonal, U-shaped, V-shaped, or semicircular, so that it can be worn directly near the user's ear. In some embodiments, the housing structure may further include one or more fixing structures. The fixing structures may include ear hooks, head beams, or elastic bands to better secure the acoustic output device to the user and prevent it from falling off during use. For example, the fixing structure may be an ear hook, which may be configured to be worn around the ear area. Alternatively, for example, the fixing structure may be a neckband configured to be worn around the neck / shoulder area. In some embodiments, the ear hook may be an integrated hook-like object, which may be elastically stretched and worn on the user's ear, and at the same time apply pressure to the user's auricle, thereby securely fixing the acoustic output device to a specific position on the user's ear or head. In some embodiments, the ear hook may be a separate strip. For example, the ear hook may include a rigid portion and a flexible portion, the rigid portion may be made of a rigid material (e.g., plastic or metal) and may be fixed to the housing structure of the sound output device by means of physical connection (e.g., locking, screw connection, etc.), and the flexible portion may be made of an elastic material (e.g., fabric, composite material and / or chloroprene rubber).

[0029] The housing structure includes at least one first sound port and at least one second sound port. The first and second sound ports may be coupled to the front and rear sides of the diaphragm in the same acoustic driver. When a user wears the acoustic output device, the housing structure allows the first and second sound ports to be positioned on the same side of the user's face. In some embodiments, a front chamber for transmitting sound is provided within the housing structure at the front position of the acoustic driver (diaphragm). The front chamber is acoustically coupled to the first sound port, and sound from the front of the acoustic driver can be emitted from the first sound port via the front chamber. A rear chamber for transmitting sound is provided within the housing structure at the rear position of the acoustic driver (diaphragm). The rear chamber is acoustically coupled to the second sound port, and sound from the rear of the acoustic driver can be emitted from the second sound port via the rear chamber. In some embodiments, the structure of the front and rear chambers can be adjusted so that the sound output from the front and rear sound ducts of the acoustic driver satisfies specific conditions. For example, the lengths of the front and rear chambers can be designed to effectively improve the problem of sound leakage at long distances from the acoustic output device by outputting a set of sound with a specific phase relationship (e.g., inverse phase) from the front and rear sound ducts of the acoustic driver. In some embodiments, the shape of the sound ducts includes, but is not limited to, square, circular, and prism shapes.

[0030] In some scenarios, a user contact surface is provided on the housing structure. When a user wears the acoustic output device, the user contact surface may be in contact with or close to the user's body part (e.g., face, head). For ease of explanation, the user contact surface may also be called the user projection surface and may be understood as the surface with the largest projected area of ​​the housing structure onto the user's body part, and is closer to the user's body relative to the acoustic driver. When a user wears the acoustic output device, the user contact surface can be considered to be in direct contact with or approximately parallel to the user's body part (e.g., face area) that is directly facing the user contact surface. When a user wears the acoustic output device, regardless of whether the user contact surface is close to but not in contact with the user's body part, or in close contact with the user's body part, the acoustic output device can output sound to the outside of the housing structure through the sound ducts of the housing structure, thereby transmitting sound to the user's ears. In some embodiments, the shape of the user contact surface may be other regular or irregular shapes such as circular, elliptical, rectangular, triangular, or rhombus. In some embodiments, the user contact surface may be a smooth plane or a surface containing one or more protrusions or recesses. In some embodiments, the user contact surface may include a silicone material layer or a hard plastic material layer (e.g., rubber, plastic, etc.), and the silicone material layer or hard plastic material layer may be bonded to the outer surface of the housing structure or integrally molded with the housing structure. The shape and structure of the user contact surface in the housing structure are not limited to the above description and can be adaptively adjusted according to the specific circumstances, and are not further limited here.

[0031] Figure 1 is a schematic diagram showing two sound ducts and a user contact surface of a housing structure according to some embodiments of the present application. As shown in Figure 1, in some embodiments, the two sound ducts may include a first sound duct B1 and a second sound duct B2, and the first sound duct B1 and the second sound duct B2 emit sound to the outside in a dipole or dipole-like manner. The distance from the first sound duct B1 to the user contact surface (in Figure 1, the parallelogram represents the user contact surface) is smaller than the distance from the second sound duct B2 to the user contact surface. The line connecting the first sound duct B1 and the second sound duct B2 intersects the user contact surface at point A, and the normal vector of the user contact surface at point A is,

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[0032] In some embodiments, when a user wears the acoustic output device, the user contact surface is approximately parallel to the user's body part (e.g., the face area) that is in direct contact with or directly facing the user contact surface. For ease of explanation, the user's face area will be described below as an example of the user's body part. In other words, the user contact surface of the acoustic output device is approximately parallel to the face area, and in this case, the angular relationship between the line connecting the at least two sound holes and the face area is approximately the same as the angular relationship between the line connecting the at least two sound holes and the user contact surface.

[0033] In some embodiments, the line connecting at least two sound holes is substantially perpendicular to the face area, i.e., the line connecting at least two sound holes is substantially perpendicular to the user contact surface. Here, substantially perpendicular may mean that the angle between the line on which the line connecting the first sound hole B1 and the second sound hole B2 is located and the user contact surface is 75° to 90°. In embodiments herein, the angle between the line connecting at least two sound holes and the user contact surface is the directional vector

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[0034] In some embodiments, the front of the acoustic driver and the housing structure form a cavity, emitting sound from the front of the acoustic driver into the cavity and directly emitting sound from the back of the acoustic driver to the outside of the acoustic output device. In some embodiments, one or more sound ducts are provided in the housing structure. The sound ducts are acoustically coupled to the cavity and guide the sound emitted from the front of the acoustic driver into the cavity to the outside of the acoustic output device. In some embodiments, the magnetic circuit structure may include a magnetic flux conducting plate positioned opposite the diaphragm. One or more sound ducts (also called depressurization holes) are provided in the magnetic flux conducting plate. The sound ducts guide the sound generated by the vibration of the diaphragm from the back of the acoustic driver to the outside of the acoustic output device. Since the sound guide holes on the front and back of the acoustic driver are located on opposite sides of the diaphragm, it can be considered that the sound emanating from the front and back of the acoustic driver has opposite or nearly opposite phases. Therefore, the front and back sound guide holes of the acoustic driver can constitute a pair of two sound sources.

[0035] In some embodiments, the back surface of the acoustic driver and the housing structure form a cavity, emitting sound from the back surface of the acoustic driver into the cavity and directly emitting sound to the outside of the acoustic output device from the front surface of the acoustic driver. In some embodiments, the magnetic circuit structure may include a flux conduction plate positioned opposite the diaphragm, and the flux conduction plate is provided with one or more sound guide holes (also called decompression holes). The sound guide holes guide the sound generated by the vibration of the diaphragm from the back surface of the acoustic driver into the cavity. In some embodiments, one or more sound guide holes may be provided in the housing structure. The sound guide holes are acoustically coupled to the cavity and guide the sound emitted from the acoustic driver into the cavity to the outside of the acoustic output device. In some embodiments, one or more sound guide holes may be provided in the side wall of the housing structure adjacent to the magnetic circuit structure. For example, when a user wears the acoustic output device, the diaphragm faces the position of the ear on the human body, and the line connecting one or more sound guide holes to the center position of the front surface of the diaphragm is approximately perpendicular to the user's face. For example, when a user wears an acoustic output device, the diaphragm is positioned on the upper or lower part of the housing structure, not facing the position of the ears, such that a line connecting one or more sound holes to the center of the front of the diaphragm is approximately parallel to the user's face, and one or more sound holes are positioned in the opposite direction to the diaphragm in the housing structure. In some cases, it can be considered that the sound propagated directly to the outside from the front of the diaphragm and the sound derived from the sound holes have opposite or nearly opposite phases, so the front of the diaphragm and the sound holes can constitute a pair of two sound sources.

[0036] In some embodiments, the acoustic output device may include a first acoustic driver and a second acoustic driver. The first acoustic driver may include a first diaphragm, and the second acoustic driver may include a second diaphragm, and the first and second acoustic drivers can each receive a first electrical signal and a second electrical signal, respectively. In some embodiments, if the first and second electrical signals have the same amplitude and opposite phases (for example, the first and second acoustic drivers are electrically connected to a signal source with opposite polarity and receive the same original sound electrical signals transmitted from the signal source), the first and second diaphragms can generate a set of sound with opposite phases. Furthermore, the housing structure can accommodate the first and second acoustic drivers, and the sound generated by the vibration of the first diaphragm can be emitted to the outside through a first sound guide hole in the housing structure, and the sound generated by the vibration of the second diaphragm can be emitted to the outside through a second sound guide hole in the housing structure. For the sake of clarity, the sound generated by the vibration of the first diaphragm may be sound generated in front of the first acoustic driver, and the sound generated by the vibration of the second diaphragm may be sound generated in front of the second acoustic driver. If the sound generated by the vibration of the first diaphragm and the sound generated by the vibration of the second diaphragm are emitted to the outside from the first and second sound ducts which directly correspond to each other, the first and second sound ducts may be considered substantially as a dual sound source (e.g., a two-point sound source). In some embodiments, the first and second sound ducts are located opposite each other. For example, when a user wears the acoustic output device, the first sound duct faces the position of the ear on the human body, and the line connecting the first and second sound ducts is substantially perpendicular to the user's face. For example, when a user wears an acoustic output device, the side wall adjacent to the side wall where the first or second sound duct of the acoustic output device is located faces the position of the human ear, and the line connecting the first and second sound ducts is approximately parallel to the user's face.

[0037] In some embodiments, the first and second acoustic drivers may be the same or similar acoustic drivers, so that the amplitude-frequency responses of the first and second acoustic drivers are the same or similar across the entire frequency band. In some embodiments, the first and second acoustic drivers may be different acoustic drivers. For example, the first and second acoustic drivers may have the same or similar frequency responses in the mid-to-high frequency range, but different frequency responses in the low-frequency band.

[0038] In some embodiments, a first acoustic driver is located within a first cavity and includes a first diaphragm. The front of the first acoustic driver and the housing structure form a first front cavity, and the back of the first acoustic driver and the housing structure form a first rear cavity. Sound is emitted from the front of the first acoustic driver into the first front cavity and from the back of the first acoustic driver into the first rear cavity. A second acoustic driver is located within a second cavity. The front of the second acoustic driver and the housing structure form a second front cavity, and the back of the second acoustic driver and the housing structure form a second rear cavity. Sound is emitted from the front of the second acoustic driver into the second front cavity and from the back of the second acoustic driver into the second rear cavity. In some embodiments, the first cavity is the same as the second cavity. The first and second acoustic drivers may be installed in the same manner within the first and second cavities, respectively, such that the first and second front cavities are the same, and the first and second rear cavities are the same, thereby making the front or back acoustic impedances of the first and second acoustic drivers the same. In other embodiments, the first and second cavities may be different, and the front or back acoustic impedances of the first and second acoustic drivers can be made the same by changing the size and / or length of the cavities or by adding sound conduits. The first acoustic driver includes a first diaphragm, and the second acoustic driver includes a second diaphragm, in which case the acoustic impedance between the first diaphragm and one of the at least two sound conduits is the same as the acoustic impedance between the second diaphragm and the other of the at least two sound conduits.

[0039] In some embodiments, an acoustic attenuation structure (e.g., a metal screen, gauze mesh, sound-tuning mesh, sound-tuning cotton, sound-tuning tube, etc.) may be installed in the sound port to reduce the amplitude of the frequency response corresponding to the front and back surfaces of the acoustic driver, bringing it closer to or equal to the amplitude of the frequency response corresponding to the front or back surface of the acoustic driver.

[0040] Figure 2 is a schematic diagram of a dipole according to some embodiments of the present application, and Figure 3 is a principle diagram of a dipole and user contact surface according to some embodiments of the present application. In order to further explain the effect of the placement of sound guides in an acoustic output device on the sound output effect of the acoustic output device, and considering that sound may be considered to propagate to the outside from the sound guides, the sound guides of the acoustic output device may be described in this application as sound sources that output sound to the outside. For the sake of simplicity and for explanatory purposes only, if the size of the sound guides of the acoustic output device is small, each sound guide may be considered as approximately one point sound source. As shown in Figures 2 and 3, the two sound guides of the acoustic output device may be considered as two point sound sources, and the sound emitted from them has the same amplitude and opposite phase, and is indicated by "+" and "-", respectively. The two sound guides constitute or are similar to a dipole, and the sound emitted to the outside has clear directionality and forms an "8" shaped sound emission region. The sound emitted from the sound guide holes is loudest in the direction of the straight line connecting the sound guide holes, and the sound emitted in other directions is clearly quieter. The sound produced by the two sound guide holes differs at different points in space and can be calculated based on the angle θ between the line connecting the two sound guide holes and a line connecting the midpoint of the line connecting the two sound guide holes to an arbitrary point in space, and the line connecting the two sound guide holes. In some embodiments, any sound guide hole that produces sound formed in an acoustic output device may be considered substantially as a single point sound source of the acoustic output device. The sound field sound pressure p generated by a single point sound source satisfies the following:

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[0042] By configuring a two-point sound source by installing at least two sound ducts in an acoustic output device, the sound emitted from the acoustic output device to the surrounding environment (i.e., sound leakage in the far field) can be reduced. In some embodiments, the acoustic output device includes at least two sound ducts, i.e., two-point sound sources, and the output sound has a certain phase difference. When certain conditions are met, such as the position and phase difference between the two sound sources, the acoustic output device can achieve different sound effects in the near and far fields. For example, if the phases of the point sound sources corresponding to the two sound ducts are opposite, i.e., the absolute value of the phase difference between the two point sound sources is 180°, then, according to the principle that sound waves with opposite phases cancel each other out, it is possible to reduce sound leakage in the far field. As shown in Figure 2, the center distance between the sound ducts of the acoustic output device is d, forming a dipole (a dipole may be considered as a combination of two pulsating spheres with a distance of d and opposite phases), and in this case, the sound pressure at the target point in the space of the acoustic output device is shown as follows.

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[0047] Figure 4 is a schematic diagram showing the relative positions of a dipole and the user's face region according to some embodiments of the present application, and Figure 5 is an equivalent principle diagram showing that the user's face region reflects the sound of the dipole according to some embodiments of the present application. As shown in Figures 4 and 5, when a user wears the acoustic output device, at least two sound ducts of the acoustic output device may be considered as two point sound sources, and these two single point sound sources each output sound with the same amplitude and opposite phase (indicated by signs "+" and "-", respectively), forming a dipole. In this case, considering any spatial point in the environment where the user is located, if the distance from the spatial point to the two single point sound sources is equal, the volume at that point is very low based on sound interference cancellation. If the distance from the spatial point to the two single point sound sources is not equal, the greater the difference in distance, the greater the volume at that point. If the angle between the line connecting the two single-point sound sources and the face region (for simplification, the face region is defined as the plane on which the area directly attached to or facing the acoustic output device on the user's face is located is 75° to 90°), then the line connecting the two single-point sound sources can be considered to be approximately perpendicular to the face region. In some embodiments, when the user wears the acoustic output device, if the user contact surface of the housing structure of the acoustic output device is approximately perpendicular to the face region, then the two single-point sound sources can also be considered to be approximately perpendicular to the user contact surface. For ease of understanding, as shown in Figure 4, the face region can be abstracted to a baffle 410, where the distance between the two single-point sound sources formed by at least two sound holes in the acoustic output device is d, and the closest distance from the two single-point sound sources to the baffle 410 is D. When two single-point sound sources produce sound, some of the sound is emitted directly into the environment, while the other portion is first emitted toward the baffle 410, reflected by the baffle 410, and then emitted into the environment. In an ideal situation, with the baffle present, the sound emission effect of the two single-point sound sources into the environment can be made equivalent to the principle diagram shown in Figure 5.As shown in Figure 5, the two sound sources formed by the two sound ducts of the acoustic output device constitute a dipole and are located to the right of the baffle 510. The distance between the two sound sources is d, the distances from the two sound sources to the baffle 510 are not equal, and the closest distance from the two sound sources to the baffle 510 is D. The angle between the line connecting the center of the two sound sources and an arbitrary observation point P in space and the line on which the two sound sources are located is θ, and the distance from the center of the two sound sources to the observation point P is r². Considering that the sound output from the two sound sources is reflected by the baffle 510, the effect is equivalent to forming two virtual single-point sound sources to the left of the baffle with the same amplitude as the two sound sources but opposite phase. The two virtual single-point sound sources constitute a dipole, the distance between the virtual two sound sources is d, and the closest distance between the virtual two sound sources and the baffle 510 is D. The distance between the center of the line connecting the two virtual sound sources and the observation point P is r1. The two virtual sound sources and the two sound sources constitute a dipole, and the angle between the line connecting the observation point and the center of the dipole and the baffle is α, and the distance between the center of the dipole and the observation point is r. The sound pressure received at the observation point is as follows:

[0048]

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[0052] Figure 8 is a schematic diagram showing the relative positions of a dipole and the user's face region according to some embodiments of the present application, and Figure 9 is an equivalent principle diagram showing that the user's face region reflects the sound of the dipole according to some embodiments of the present application. As shown in Figures 8 and 9, when a user wears the acoustic output device, at least two sound ducts of the acoustic output device may be considered as two single-point sound sources, forming a two-point sound source, and these two single-point sound sources each output sound with the same amplitude and opposite phase (indicated by the signs "+" and "-", respectively), forming a dipole. In this case, considering any spatial point in the environment where the user is located, if the distance from the spatial point to the two single-point sound sources is equal, the volume at that point is very low based on sound interference cancellation. If the distance from the spatial point to the two single-point sound sources is not equal, the greater the difference in distance, the greater the volume at that point. If the angle between the line connecting the two single-point sound sources and the face region (for simplification, the face region is considered equivalent to the plane on which the area directly attached to or facing the acoustic output device on the user's face is located) is between 0 and 15°, then the line connecting the two single-point sound sources can be considered to be approximately parallel to the face region. In some embodiments, when a user wears the acoustic output device, if the user contact surface of the housing structure of the acoustic output device is approximately parallel to the face region, then the two single-point sound sources can also be considered to be approximately parallel to the user contact surface. For ease of understanding, as shown in Figure 8, the face region can be abstracted to a baffle, where the distance between the two single-point sound sources formed by at least two sound ducts in the acoustic output device is d, and the closest distance from the two single-point sound sources to the baffle is D. When the two single-point sound sources produce sound, some of the sound is emitted directly into the environment, while the other part of the sound is first emitted toward the baffle, reflected by the baffle, and then emitted into the environment. In ideal conditions, with a baffle present, the sound emission effect of two single-point sound sources in an environment can be made equivalent to the principle diagram shown in Figure 9.As shown in Figure 9, the two sound sources formed by the two sound ducts of the acoustic output device constitute a dipole, located to the right of the baffle, with a distance of d between the two sound sources, an equal distance from the two sound sources to the baffle, and the closest distance from the two sound sources to the baffle being D. The angle between the line connecting the center of the two sound sources to an arbitrary observation point P in space and the line on which the two sound sources are located is θ, and the distance from the center of the two sound sources to observation point P is r². Considering that the sound output from the two sound sources is reflected by the baffle, the effect is equivalent to forming two virtual single-point sound sources to the left of the baffle, with the same amplitude and phase as the two sound sources. The two virtual single-point sound sources constitute a dipole, with a distance of d between the virtual two sound sources, and the closest distance from the virtual two sound sources to the baffle being D. The distance between the center of the line connecting the two virtual sound sources and the observation point P is r1. The two virtual sound sources and the two sound sources constitute a dipole, and the angle between the line connecting the observation point and the center of the dipole and the baffle is α, and the distance between the center of the dipole and the observation point is r. The sound pressure received at the observation point is as follows:

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[0057] Figure 12 is a sound pressure curve diagram showing the case where the angle between the line connecting two sound holes in some embodiments of the present application and the user contact surface or user body part differs. The closest distance from the dipole, which is formed by at least two sound holes in the acoustic output device corresponding to Figure 12, to the user's body part (baffle) is 3 mm, the distance between the dipoles is 0.5 mm, and the far-field region is the region other than a circle with a radius of 250 mm, with the center of the dipole as the origin. In the figure, the horizontal axis shows the angle between the observation point in the far-field region and the center of the dipole, and the vertical axis shows the sound pressure at the observation point. The solid line in the figure is the relationship curve between the absolute value of the sound pressure at the observation point in the far-field region and the observation angle (the angle between the line connecting the observation point and the center point of the bidipole and the normal at the center point of the bidipole) when the line connecting at least two sound holes in the acoustic output device is approximately perpendicular to the user's face area. The sound pressure at the observation point in the far-field region is the angle of the observation angle

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[0058] Figure 13 is a schematic diagram of an acoustic output device according to some embodiments of the present application. In some embodiments, the sound holes in Figure 13 are the same as sound holes forming a two-point sound source or dipole as described elsewhere in the present application. As shown in Figure 13, the acoustic driver 1220 may include a diaphragm 1201 and a magnetic circuit structure 1222. The acoustic driver 1220 may further include a voice coil (not shown). The voice coil may be fixed to the side of the diaphragm 1201 facing the magnetic circuit structure 1222 and may be located in the magnetic field formed by the magnetic circuit structure 1222. When energized, the voice coil vibrates due to the action of the magnetic field and can generate sound by driving the diaphragm 1201 to vibrate. For the sake of clarity, the side of the diaphragm 1201 facing away from the magnetic circuit structure 1222 (i.e., the right side of the diaphragm 1201 in Figure 13) may be considered the front of the acoustic driver 1220, and the side of the magnetic circuit structure 1222 facing away from the diaphragm 1201 (i.e., the left side of the magnetic circuit structure 1222 in Figure 13) may be considered the back of the acoustic driver 1220. The vibration of the diaphragm 1201 allows the acoustic driver 1220 to emit sound to the outside from its front and back sides, respectively. As shown in Figure 13, the front of the acoustic driver 1220 or the diaphragm 1201 and the housing structure 1210 form a first cavity 1211, and the back of the acoustic driver 1220 and the housing structure 1210 form a second cavity 1212. Sound is emitted from the front of the acoustic driver 1220 into a first cavity 1211, and sound is emitted from the back of the acoustic driver 1220 into a second cavity 1212. In some embodiments, the housing structure 1210 may further include a first sound guide hole 1213 communicating with the first cavity 1211 and a second sound guide hole 1214 communicating with the second cavity 1212. Sound generated on the front of the acoustic driver 1220 is propagated to the outside through the first sound guide hole 1213, and sound generated on the back of the acoustic driver 1220 is propagated to the outside through the second sound guide hole 1214. In some embodiments, the magnetic circuit structure 1222 may include a magnetic flux conducting plate 1221 positioned opposite the diaphragm.The magnetic flux conducting plate 1221 has at least one sound guide hole 1223 (also called a depressurization hole) that guides sound generated by the vibration of the diaphragm 1201 out from the back surface of the acoustic driver 1220 and propagates to the outside from the second cavity 1212. The acoustic output device forms a dual sound source (or multiple sound sources) similar to a dipole structure by sound emission from the first sound guide hole 1213 and the second sound guide hole 1214, and generates a specific sound field with a certain directivity. In some embodiments, the acoustic driver 1220 may output sound directly to the outside, that is, the acoustic output device 1200 does not need to have the first cavity 1211 and / or the second cavity 1212 installed, and the sound generated on the front and back surfaces of the acoustic driver 1220 can be used as a dual sound source. Note that the acoustic output device in the embodiments of this specification is not limited to application to earphones, but may also be applied to other audio output devices (e.g., hearing aids, megaphones, etc.).

[0059] Figures 14 and 15 are schematic configuration diagrams of another acoustic output device according to some embodiments of the present invention. As shown in Figure 14, the line connecting the first sound port 1313 of the first acoustic driver 1320 and the second sound port 1314 of the second acoustic driver 1330 is substantially perpendicular to the user's body part or the user contact surface of the acoustic output device. The first acoustic driver 1320 and the second acoustic driver 1330 may be the same acoustic driver, and the signal processing module can control the front of the first acoustic driver 1320 and the front of the second acoustic driver 1330 by control signals (e.g., a first electrical signal and a second electrical signal) to generate sounds that satisfy certain phase and amplitude conditions (e.g., sounds with the same amplitude but opposite phase, sounds with different amplitudes but opposite phase, etc.). Sound generated in front of the first acoustic driver 1320 is emitted from the first sound guide hole 1313 to the outside of the acoustic output device 1300, and sound generated in front of the second acoustic driver 1330 is emitted from the second sound guide hole 1314 to the outside of the acoustic output device 1300. The first sound guide hole 1313 and the second sound guide hole 1314 can be made equivalent to a dual sound source that outputs sounds with opposite phases. Unlike the case where a dual sound source is formed by sound generated on the front and back of an acoustic driver, in this case, the fronts of the two acoustic drivers, i.e., the front of the first acoustic driver 1320 and the front of the second acoustic driver 1330, generate sound with opposite phases and emit it to the outside from the first sound port 1313 and the second sound port 1314. If the acoustic impedance from the first acoustic driver 1320 to the first sound port 1313 is equal to or approximately equal to the acoustic impedance from the second acoustic driver 1330 to the second sound port 1314, then a more effective dual sound source can be formed by sound emitted from the first sound port 1313 and the second sound port 1314 within the acoustic output device 1300. In other words, the first sound port 1313 and the second sound port 1314 can emit sound with opposite phases more accurately.In long-range fields, particularly in the mid-to-high frequency band (e.g., 200Hz to 20kHz), the sound emitted from the first sound port 1313 can effectively cancel out the sound emitted from the second sound port 1314. This better suppresses sound leakage from the sound output device in the mid-to-high frequency band and prevents the sound generated by the sound output device 1300 from being heard by others near the user, thereby improving the sound leakage reduction effect of the sound output device 1300.

[0060] If the front of the first acoustic driver 1320 and the front of the second acoustic driver 1330 are located on different sides of the housing structure, then the first sound port 1313 and the second sound port 1314 are also located on different sides of the housing structure 1310, so the housing structure 1310 acts as a baffle between dual sound sources (for example, sound emitted from the first sound port 1313 and sound emitted from the second sound port 1314). In this case, the housing structure 1310 separates the first sound port 1313 and the second sound port 1314 so that the acoustic paths from the first sound port 1313 to the user's ear canal are different. On the other hand, by arranging the first sound port 1313 and the second sound port 1314 on both sides of the housing structure 1310, the difference in the path distance that the first sound port 1313 and the second sound port 1314 take to transmit sound to the user's ear (i.e., the difference in the distance that sound emitted from the first sound port 1313 and the second sound port 1314 travels to reach the user's ear canal) can be increased. This reduces the sound cancellation effect in the user's ear (i.e., the near field), and further increases the volume of sound heard by the user's ear (also called near-field sound), providing the user with a superior auditory experience. On the other hand, the housing structure 1310 has little effect on sound emitted into the environment from the sound guide holes (also called far-field sound), and the far-field sound emitted from the first sound guide hole 1313 and the second sound guide hole 1314 can still cancel each other out well, thereby suppressing sound leakage from the sound output device 1300 to a certain extent, and preventing the sound generated by the sound output device 1300 from being heard by others near the user. Therefore, the above installation makes it possible to improve the listening volume of the sound output device 1300 in the near field and reduce the sound leakage volume of the sound output device 1300 in the far field.

[0061] The acoustic output device shown in Figure 15 and the acoustic output device shown in Figure 14 have almost the same overall structure, with the difference being that the front of the first acoustic driver 1320 faces downwards, the front of the second acoustic driver faces upwards, the first sound guide hole 1313 of the housing structure 1310 outputs sound generated in front of the first acoustic driver 1320, the second sound guide hole 1314 of the housing structure 1310 outputs sound generated in front of the second acoustic driver 1330, and the line connecting the dipole formed by the sound emitted from the first sound guide hole 1313 and the sound emitted from the second sound guide hole 1314 is approximately parallel to the user's body part or the user contact surface of the acoustic output device.

[0062] In some embodiments, to improve the noise reduction effect of the acoustic output device, the acoustic output device may further include at least one microphone capable of collecting noise signals from the external environment and transmitting the noise signals to a signal processing module of the acoustic output device, which can achieve noise reduction by emitting a sound that is in opposite phase to the noise signal and has the same amplitude, based on the parameters of the noise signal (e.g., phase and amplitude). Figure 16 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present application. As shown in Figure 16, if the line connecting the dipole formed by the sound emitted from the two sound ducts of the acoustic output device 1600 (indicated by "+" and "-" in Figure 16) is substantially perpendicular to the user's face area, the microphone 1601 may be located in the housing structure 1610 of the acoustic output device 1600 or in the acoustic driver (e.g., a magnetic circuit structure). In some embodiments, the microphone 1601 may be installed on the outside or inside of the side wall of the housing structure 1610. In some embodiments, the microphone 1601 may be located on the side wall of the housing structure 1610 on the circumferential side of the magnetic circuit structure. In some embodiments, the microphone 1601 may be located away from the sound port in order to collect noise from the external environment while simultaneously reducing the sound generated by the acoustic output device 1600 itself. For example, the microphone 1601 may be located on a different side wall from the side wall where the sound port of the housing structure 1610 is located. Furthermore, if the line connecting the dipole formed by the sound from the two sound ports of the acoustic output device 1600 is approximately perpendicular to the user's face area, the acoustic output device may have a sound pressure minimum region (dashed line and surrounding area in Figure 16), which may be a region where the intensity of the sound output from the acoustic output device is low. For example, the light-colored areas 701 and 702 in Figure 7. In some embodiments, the microphone 1601 may be located in the sound pressure minimum region of the acoustic output device.Specifically, as shown in Figure 16, when the line connecting the two sound sources formed by at least two sound guide holes of the acoustic output device 1600 is approximately perpendicular to the user's face area, there are three strong sound field regions (e.g., sound field region 1621, sound field region 1622, and sound field region 1623 shown in Figure 16) and two sound pressure minimum regions, namely the dashed line and the area near it in Figure 16. Combining Figures 7 and 16, the strong sound field regions correspond to the three dark-colored regions shown in Figure 7 (e.g., regions 703, 704, and 705), and the sound pressure minimum regions correspond to the two light-colored regions 701 and 702 shown in Figure 7. One or more microphones 1601 are positioned in the light-colored regions 701 and 702 shown in Figure 7, preferably one or more microphones 1601 are positioned on the centerlines of the light-colored regions 701 and / or region 702 in Figure 7, i.e., at the position of the dashed line shown in Figure 16. By placing microphone 1601 in the sound pressure minimum region of the sound output device, microphone 1601 can collect external environmental noise while simultaneously minimizing the sound generated by the sound output device 1600 itself. As a result, microphone 1601 can provide more realistic ambient sound for subsequent audio signal processing, thereby achieving functions such as active noise reduction for the sound output device 1600.

[0063] Figure 17 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present application. As shown in Figure 17, if the line connecting the dipole formed by the sound emitted from the two sound holes of the acoustic output device 1700 (indicated by "+" and "-" in Figure 17) is substantially parallel to the user's face area, the microphone 1701 may be located in the housing structure 1710 of the acoustic output device 1700 or in the acoustic driver (e.g., a magnetic circuit structure). In some embodiments, the microphone 1701 may be installed on the outside or inside of the side wall of the housing structure 1710. In some embodiments, the microphone 1701 may be located on the side wall of the housing structure 1710 on the circumferential side of the magnetic circuit structure. In some embodiments, the microphone 1701 may be located away from the sound holes in order to collect noise from the external environment while simultaneously reducing the sound generated by the acoustic output device 1700 itself. For example, the microphone 1701 may be located on a side wall different from the side wall where the sound holes of the housing structure 1710 are located. Furthermore, if the line connecting the dipole formed by the sound from the two sound holes of the acoustic output device 1700 is approximately parallel to the user's face area, the acoustic output device has a sound pressure minimum region (the dashed line and the surrounding area in Figure 17), and in some embodiments, the microphone 1701 may be located in the sound pressure minimum region of the acoustic output device. Specifically, as shown in Figure 17, if the line connecting the two point sound sources formed by at least two sound holes of the acoustic output device 1700 is approximately parallel to the user's face area, it has two strong sound field regions (regions 1721 and 1722 shown in Figure 17) and one sound pressure minimum region, namely the dashed line and the surrounding area in Figure 17. Combining Figures 11 and 17, the strong sound field region 1721 and sound field region 1722 correspond to the two darker colored regions 1102 and 1103 with high sound pressure values ​​shown in Figure 11, and the sound pressure minimum region corresponds to the lighter colored sound pressure minimum region 1101 shown in Figure 11. One or more microphones 1701 may be located in the dashed line and its vicinity shown in Figure 17, and preferably, one or more microphones 1701 may be located at the position of the dashed line shown in Figure 17.By positioning the microphone 1701 in the sound pressure minimum region of the sound output device 1700, the microphone 1701 can collect external environmental noise while simultaneously minimizing the sound generated by the sound output device 1700 itself. As a result, the microphone 1701 can provide more realistic ambient sound for subsequent audio signal processing, thereby achieving functions such as active noise reduction for the sound output device 1700.

[0064] Note that the acoustic output device 1600 shown in Figure 16 and the acoustic output device 1700 shown in Figure 17 are merely illustrative examples. The acoustic output device may also be an acoustic output device including two acoustic drivers, such as the acoustic output devices shown in Figures 14 and 15. In other words, the selection criteria for the position of the microphones (e.g., microphone 1601 and microphone 1701) are the same for the acoustic output devices shown in Figures 14 and 15.

[0065] While the basic concepts have been explained above, it will be clear to those skilled in the art that the detailed disclosures above are merely examples and do not limit the present application. Although not explicitly stated herein, those skilled in the art can make various changes, improvements, and modifications to the present application. These changes, improvements, and modifications are intended to be suggested by the present application and are therefore within the spirit and scope of the exemplary embodiments of the present application.

[0066] Furthermore, certain terms are used in this Application to describe embodiments thereof. For example, “one embodiment,” “one embodiment,” and / or “several embodiments” mean certain features, structures, or properties relating to at least one embodiment of this Application. Therefore, it should be emphasized and understood that two or more references to “one embodiment,” “one embodiment,” or “one alternative embodiment” in various parts of this Specification do not necessarily all refer to the same embodiment. Also, certain features, structures, or properties in one or more embodiments of this Application may be appropriately combined.

[0067] Furthermore, as will be understood by those skilled in the art, each aspect of this Application may be illustrated and described in several patentable classes or contexts, including any novel and useful combination of processes, machines, products or materials, or any novel and useful improvement thereto. Thus, each aspect of this Application may be executed entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. Any of the above hardware or software may be referred to as “data blocks,” “modules,” “engines,” “units,” “assemblies,” or “systems.” Also, each aspect of this Application may take the form of a computer program product embodied in one or more computer-readable media containing computer-readable program code.

[0068] A computer storage medium may include propagated data signals that are propagated over the baseband or as part of a carrier wave for carrying computer program code. These propagated signals may take various forms, such as electromagnetic signals, optical signals, or appropriate combinations thereof. The computer storage medium may be any computer-readable medium other than a computer-readable storage medium, which can be connected to an instruction execution system, device, or apparatus to enable communication, propagation, or transmission of the program being used. The program code on the computer storage medium can be propagated via any appropriate medium, including wireless, cable, fiber optic cable, RF, or similar media, or any combination of the above media.

[0069] The computer program code required to operate each part of this application may be coded in one or more programming languages, including object-oriented programming languages ​​such as Java, Scala, Smalltalk, Eiffel, JADE, Emerald, C++, C#, VB.NET, and Python; traditional procedural programming languages ​​such as C, Visual Basic, Fortran 2003, Perl, COBOL 2002, PHP, and ABAP; dynamic programming languages ​​such as Python, Ruby, and Groovy; or other programming languages. The program code may run entirely on the user's computer, run as a standalone software package on the user's computer, run partially on the user's computer and partially on a remote computer, or run entirely on a remote computer or server. In the latter case, the remote computer may be connected to the user's computer via any network configuration such as a local area network (LAN) or wide area network (WAN), connected to an external computer (e.g., via the Internet), in a cloud computing environment, or used as a service such as Software as a Service (SaaS).

[0070] Furthermore, unless explicitly stated in the claims, the enumerated order, use of alphanumeric characters, or use of other names of the processing elements or sequences relating to this application does not limit the order of the procedures and methods of this application. While the above disclosure illustrates various examples that are currently considered useful embodiments of the invention, such details are for illustrative purposes only, and it should be understood that the attached claims are not limited to the disclosed embodiments, but rather are intended to cover all modifications and equivalent combinations that fall within the spirit and scope of the embodiments of this application. For example, the system assembly described above may be implemented by a hardware device, but it may also be implemented as a software-only solution, for example, by installing the described system on an existing server or mobile device.

[0071] Similarly, in the foregoing description of embodiments of the present application, it should be understood that, for the purpose of simplifying the application and aiding in the understanding of embodiments of one or more inventions, various features may be grouped together in a single embodiment, drawing, or description. However, such disclosure methods should not be interpreted as reflecting an intention that the claimed subject matter requires more features than those enumerated in each claim. In fact, the features of an embodiment may be fewer than all the features of a single embodiment disclosed above.

[0072] In some embodiments, numbers are used to describe the number of components and attributes, and it should be understood that these numbers describing such embodiments are modified in some cases by the modifiers “approximately,” “about,” or “roughly.” Unless otherwise specified, “approximately,” “about,” or “roughly” indicates that the above numbers are allowed to vary by ±20%. Therefore, in some embodiments, the numerical parameters used in the specification and claims are all approximations that may vary depending on the characteristics required for the individual embodiment. In some embodiments, the numerical parameters should be rounded using standard rounding techniques, taking into account the specified number of significant figures. In some embodiments of this application, the numerical ranges and parameters used to determine the range are approximations, but in specific embodiments, such numbers are set as precisely as possible.

[0073] All patents, patent applications, published patent gazettes, and other materials such as articles, books, specifications, publications, and documents referenced herein are incorporated into this application by reference in their entirety. Except for any prosecution history documents that are inconsistent with or contradict the content of this application, and any documents that may have a limited effect on the broadest scope of the claims of this application (currently or later relating to this application), they are incorporated into this application by reference in their entirety. In the event that any explanations, definitions, and / or use of terms in the appendices to this application are inconsistent with or contradict the content of this application, the explanations, definitions, and / or use of terms in this application shall prevail.

[0074] Finally, it should be understood that the embodiments relating to this application are merely illustrative of the principles of the embodiments thereof. Other modifications may also be within the scope of this application. Therefore, without limitation, alternative configurations of the embodiments thereof may be considered consistent with the teachings herein, for example. Thus, the embodiments of this application are not limited to those explicitly introduced and described herein. [Explanation of Symbols]

[0075] 1201 Vibrating membrane 1222 Magnetic Circuit Structure 1210 Housing structure 1211 First Cavity 1213 First sound channel 1214 Second sound channel 1221 Magnetic flux conducting plate

Claims

1. It is an audio output device, A sound driver that does not block the user's ear canal, is positioned close to the user's ear canal, and generates a set of sounds with opposite phases that are emitted to the outside from at least two sound conduits, A housing structure comprising a user contact surface configured to mount the at least one acoustic driver and configured to come into contact with the user's body when the user wears the acoustic output device, wherein the housing structure is a hollow, sealed or semi-sealed housing structure, and the at least one acoustic driver is disposed inside the housing structure, Includes, The angle formed by the line connecting the at least two sound guide holes and the user contact surface is within the range of 75° to 90°. The at least two sound ducts include a first sound duct and a second sound duct, and the distance from the first sound duct to the user contact surface is smaller than the distance from the second sound duct to the user contact surface. The distance from the first sound guide hole to the user contact surface is 5 mm or less. The first sound guide hole and the second sound guide hole are positioned on the side surface of the housing structure at an angle of 75° to 90° with the user contact surface. The acoustic output device is characterized in that an ear hook is connected to the housing structure, and the ear hook is configured to be worn on the user's ear so as to fix the acoustic output device in a specific position on the user's ear or head.

2. The acoustic output device according to claim 1, characterized in that the distance from the first sound guide hole to the user contact surface is 2 mm or less.

3. The acoustic output device according to claim 1, wherein the at least one acoustic driver includes a diaphragm and a magnetic circuit structure, the side of the diaphragm facing away from the magnetic circuit structure forms the front of the acoustic driver, the side of the magnetic circuit structure facing away from the diaphragm forms the back of the acoustic driver, and the acoustic driver emits sound to the outside from its front and back surfaces, respectively, due to the vibration of the diaphragm.

4. The acoustic output device according to claim 1, wherein the at least one acoustic driver includes a first acoustic driver including a first diaphragm and a second acoustic driver including a second diaphragm, and the sound generated by the vibration of the first diaphragm and the sound generated by the vibration of the second diaphragm are in opposite phases and are each emitted to the outside through the at least two sound guide holes.

5. The acoustic output device according to claim 1, wherein the first acoustic driver includes a first magnetic circuit structure, the first diaphragm and the first magnetic circuit structure are arranged in order along the vibration direction of the first diaphragm, the side of the first magnetic circuit structure facing away from the first diaphragm forms the back surface of the first acoustic driver, the first magnetic circuit structure includes a first magnetic flux conducting plate installed opposite to the first diaphragm, and the first magnetic flux conducting plate includes at least one depressurization hole configured to guide sound generated by the vibration of the first diaphragm out from the back surface of the first acoustic driver.

6. The acoustic output device according to claim 1, characterized in that at least two sound guide holes are provided with attenuation layers.

7. The acoustic output device according to claim 1, further comprising at least one microphone configured to collect noise signals from the external environment, wherein the at least one microphone is installed on a side wall of the housing structure different from the side wall on which the at least two sound guide holes are located.

8. The sound output device according to claim 7, characterized in that the at least one microphone is located in the sound pressure minimum region of the sound output device where the intensity of the sound output from the sound output device is minimal.

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