ACOUSTIC OUTPUT DEVICE

Abstract

This description outlines 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 emit sounds having opposite phases from the at least two sound guide holes. The housing structure may be configured to carry the at least one acoustic driver. The housing structure may include a user contact surface for contact with a user. When the user operates the acoustic output device, the user contact surface may be in contact with the user's body. An angle included between a connecting line between the at least two sound guide holes and the user contact surface may be in the range of 75°–105°.

Description

This presentation refers to the acoustic field and, in particular, to acoustic output devices. Background of the Invention An open-back binaural acoustic output device is a portable audio output device that facilitates sound conduction within a specific range. Compared to conventional in-ear and over-ear headphones, open-back binaural acoustic output devices can have the advantage of not blocking or covering the ear canal, allowing users to obtain ambient sound information while listening to music, thus improving user safety and comfort. Due to their open design, sound leakage from open-back binaural acoustic output devices can be more significant than that of conventional headphones. Currently, open-back binaural acoustic output devices can suffer from issues such as insufficient sound volume and relatively significant sound leakage. Therefore, it is desirable to provide a more effective acoustic output device, which can increase a user's listening volume and reduce sound leakage. Summary of the Invention Some embodiments of the present display provide an acoustic output apparatus. The acoustic output apparatus may include: at least one acoustic controller, wherein the at least one acoustic controller generates sounds that have opposite phases, and the sounds with opposite phases are radiated outwards from at least two sound guide holes, respectively; and a housing structure configured to carry the at least one acoustic controller and which includes a user contact surface, wherein when a user uses the acoustic output apparatus, the user contact surface is configured to be in contact with the user's body. An angle included between a connecting line of the at least two sound guide holes - 2 sound and the user's contact surface can be in a range of 75° to 90°. In some modalities, the at least two sound guide holes may include a first sound guide hole and a second sound guide hole. The distance from the first sound guide hole to the user contact surface may be less than the distance from the second sound guide hole to the user contact surface. In some models, the distance from the first sound guide hole to the user contact surface can be less than or equal to 5 mm. In some modalities, the 'distance from the sound guide hole to the contact surface with the user may be less than or equal to nrn. In some modes, the distance between the first sound guide hole and the second sound guide hole may be less than or equal to 2 rrm. In some modes, the distance between the first sound guide hole and the second sound guide hole can be less than or equal to 0.5 rm. In some configurations, at least one acoustic controller may include a diaphragm and a magnetic circuit structure. One side of the diaphragm <gma cpie se orienta alegado de la estructura de circuito magnético puede formar el lado frontal del al menos un controlador acústico. Un lado de la estructura de circuito magnético cpre se orienta alejado del diafragma puede formar un lado posterior del al menos un controlador acústico. El diafragma puede vibrar para hacer que el al rrenos un controlador acústico irradie sonidos hacia el exterior desde el lado frontal y el lado posterior del al menos un controlador acústico, re spect i v arre nt e. In some models, at least one acoustic controller may include a first acoustic controller and a second acoustic controller. The first acoustic controller may include a first diaphragm. The second acoustic controller may include a second diaphragm. A sound generated by the vibration of the first diaphragm and a sound generated by the vibration of the second diaphragm may be in opposite phases. The sounds generated by the vibration of the first diaphragm and the second diaphragm may radiate outwards from at least two sound guide holes, respectively. RRcnnn / eznz / E / YiAi -3In some models, a damping layer may be provided in at least the two sound guide holes. In some models, the buffer layer may be a metal filter mesh or a gauze mesh. Other embodiments of the present display provide an acoustic output apparatus. The acoustic output apparatus may include at least one acoustic driver, wherein the at least one acoustic driver generates sounds having opposite phases, and the sounds with opposite phases are radiated outwards from at least two sound guide holes, respectively; and a housing structure configured to carry the at least one acoustic driver and include a contact surface with the user, wherein when a user operates the acoustic output apparatus, the user contact surface is configured to be in contact with the user's body. An angle included between a connecting line of the at least two sound guide holes and the user contact surface may be in the range of 0° to 15°. In some other embodiments, the at least two sound guide holes may include a first sound guide hole and a second sound guide hole, and the distance from the first or second sound guide hole to the contact surface with the user may be less than or equal to 5 mm. The distance from the first sound guide hole; or the second) hole; of the sound figure; to the contact surface; with the user; may be less than or equal to 2 mm. In other modalities, the 'distance between the first sound guide hole and the second sound guide hole may be less than or equal to 2 rpm. In other modalities, the distance between the first sound guide hole and the second sound guide hole may be less than or equal to 0.5 rrm. In other embodiments, the at least one acoustic controller may include a diaphragm and a magnetic circuit structure. One side of the diaphragm oriented away from the magnetic circuit structure may form the front side of the at least one acoustic controller. One side of the magnetic circuit structure oriented away from the diaphragm may form a rear side of the at least one acoustic controller. The diaphragm may vibrate to cause the at least one acoustic controller to radiate sounds outward from the front and rear sides of the at least one acoustic controller. RRcnnn / eznz / E / YiAi - 4 respectively. In other embodiments, the at least one acoustic controller may include a first acoustic controller and a second acoustic controller. The first acoustic controller may include a first diaphragm. The second acoustic controller may include a second diaphragm. A sound generated by the vibration of the first diaphragm and a sound generated by the vibration of the second diaphragm may have opposite phases. The sounds generated by the vibration of the first diaphragm and the second diaphragm may radiate outwards from the at least two sound guide holes, respectively. RRcnnn / eznz / E / YiAi Brief Description of the Figures of the Invention The present exposition is further illustrated in terms of exemplary modalities. These exemplary modalities are described in detail with reference to the drawings. These modalities are non-literate exemplary modalities, in which the same reference numbers represent sirralar structures, in which: Figure 1 is a schematic diagram illustrating two sound guide holes and a user contact surface of a housing structure 'according to some modalities' of the present exposition; Figure 2 is a schematic diagram illustrating a 'dipole according to some modalities of the present exposition; Figure 3 is a diagram of the basic principle of a clippole and Lina contact surface with the user according to some modalities of the present exposition; Figure 4 is a schematic diagram illustrating the position of a dipole with respect to the user's face area 'according to some modalities of the present exposition; Figure 5 is a basic equivalent principle diagram illustrating the reflection formed by the area of ​​a user's face to the sound of a dipole according to some modalities of the present exposition; Figure 6 is a graph of frequency response curves of acoustic output devices with two point sound sources at 'different distances dy' and 'different distances D' from a point sound source to the user's face area according to some modalities of the present cxposicicn. Figure 7 is a diagram of the 'energy distribution' of the sound field of 'two portal sound sources at 1000 Hz according to some modalities of the -5present exhibition; Figure 8 is a schematic diagram illustrating the position of a dipole with respect to the user's face area according to some modalities of the present exposure; Figure 9 is a basic equivalent diagram illustrating the reflection formed by the user's face area to the sound of a dipole according to some modalities of the present exposition; Figure 10 is a graph of frequency response curves of acoustic output devices with two point sound sources at different distances dy and different distances D from a point sound source to a region of the user's face according to some modalities of the present presentation. Figure 11 is a diagram of 'sound field energy distribution of two point sound sources at 1000 He according to some modalities of the present exposition. Figure 12 is a graph of the acoustic pressure curve of an angle included between a connecting line of two sound guide holes and a contact surface with the user or a part of the user's body under different conditions 'according to some modalities' of the present exposition; Figure 13 is a schematic structural diagram illustrating an exemplary acoustic output apparatus according to some modalities of the present exposition; Figure 14 is a schematic structural diagram illustrating another exemplary acoustic output apparatus according to some modalities of the present exposition; Figure 15 is a schematic structural diagram illustrating another exemplary acoustic output apparatus according to some modalities of the present exposition; Figure 16 is a schematic diagram illustrating an exemplary acoustic output apparatus according to some modalities of the present exposition; and Figure 17 is a structural schematic diagram illustrating an exemplary acoustic output apparatus according to some modalities of the present exposition. RRcnnn / eznz / E / YiAi - 6 Detailed Description of the Invention To more clearly illustrate the technical solutions related to the modalities of this exposition, a brief introduction to the drawings referring to the description of the modalities is provided below. Obviously, the CPIE drawings described below are only a few examples or modalities of this exposition. Those with ordinary technical skills can, without further creative effort, apply this exposition to other similar scenarios according to these drawings. Unless it is obvious from the context or the context illustrates otherwise, the same number in the drawings refers to the same structure or operation. It should be understood that the system, device, unit, and / or module used herein are a method for distinguishing different components, elements, parts, sections, or installations at different levels. However, if other words can achieve the same purpose, these words may be replaced by other expressions. In the statement of facts and accompanying claims, the singular forms a, one, and the include plural referents unless the content clearly dictates otherwise; the plural forms may also be intended to include singular forms. In general, the terms comprise, comprise, and / or; comprising, include, include, and / or including, simply suggest the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. Methods or devices may also include other steps or elements. The flowcharts used in this presentation illustrate operations that the system implements according to the methodology described herein. It should be understood that the preceding or following operations may not necessarily be performed in the same order. Instead, operations may be processed in reverse order or simultaneously. Furthermore, one or more operations may be added to these processes, or one or more operations may be removed from them. In some embodiments, the acoustic output apparatus may include an acoustic controller and a housing structure. The acoustic controller may be disposed within the housing structure. A sound generated by an acoustic controller in the acoustic output apparatus may be propagated to the outside through at least two sound-guide openings. RRcnnn / pznz / E / YiAi - 7 acoustically with at least one acoustic driver. In some embodiments, the two sound guide holes that are acoustically coupled with the same acoustic driver may be distributed on the same side of a user's head or face. In this case, the user's head or face can be considered approximately as a baffle. The baffle may reflect the sound emitted by the two sound guide holes. In space, the sound reflected by the baffle may interfere with the sound directly radiated by each of the two sound guide holes, thus changing the amplitude of the sound transmitted by the acoustic output device to a specific position. In some embodiments, by designing a distance and an angle between the sound guide hole and the head or face...The sound generated by the acoustic output device in the surrounding environment can have a relatively small amplitude, which reduces the leakage of sound from the acoustic output device into the surrounding environment and also prevents the sound generated by the acoustic output device from being heard by other people close to the user. This presentation provides an acoustic output device. In some embodiments, the acoustic output device may be combined with a product such as a pair of glasses, a headset, a head-mounted display device, an AR / VR headset, etc. In this case, the acoustic output device may be attached near the user's ear by means of a pendant or a fastening device. When the user uses the acoustic output device, it may be positioned at least on one side of the user's head, near the user's ear, but without blocking it. In some alternative embodiments, the outer surface of the acoustic output device may include a hook, and the shape of the hook may match the shape of an earpiece, such that the acoustic output device may be worn independently on the user's ear by means of the hook.The acoustic output device worn in the user's ear can communicate independently with a signal source (e.g., a computer, a mobile phone, or other mobile devices) via wired or wireless means (e.g., Bluetooth). For example, the acoustic output device worn in the left and / or right ear can communicate directly with the signal source wirelessly. As another example, the acoustic output device worn in the left and / or right ear can include a first output device and a second output device. The first output device can... RRcnnn / eznz / E / YiAi -8 communicate with the signal source, and the second output device can communicate with the first output device wirelessly. Audio can be played synchronously between the first and second output devices via one or more synchronization signals. The wireless form may include, but is not limited to, Bluetooth, a local area network, a wide area network, a wireless personal area network, near-field communication, or similar means, or any combination thereof. The acoustic output apparatus may be worn on the user's head (e.g., an open-back earphone used as eyeglasses, a headband, or other structures not placed in the ear), or worn on another part of the user's body (e.g., the user's neck, shoulder, or an area of ​​the face), or placed near the user's ear in other ways (e.g., via a hand-held manner).At the same time, the acoustic driver can be placed near the user's ear canal, but without blocking it, so the user's ear remains unobstructed. The user can hear not only the sound output from the acoustic output device, but also ambient sound. For example, the acoustic output device can be positioned around or partially around the user's ear and transmit sound via aerotympanic conduction or bone conduction. An acoustic driver can be a component configured to receive an electrical signal and convert it into a sound signal that can be emitted. In some cases, if categorized according to the frequency of the acoustic driver, one type of acoustic driver might include a low-frequency acoustic driver (e.g., 30 Hz–150 Hz), a low-mid-frequency acoustic driver (e.g., 150 Hz–500 Hz), a high-mid-frequency acoustic driver (e.g., 500 Hz–5 kHz), a high-frequency acoustic driver (e.g., 5 kHz–10 kHz), a full-frequency acoustic driver (e.g., 30 Hz–10 kHz), or similar, or any combination thereof. The terms "low frequency," "high frequency," etc., mentioned here can simply be used to indicate an approximate frequency range. In different application scenarios, the frequency can be divided in various ways.For example, a frequency split point can be determined. The low frequency may indicate a frequency range that is lower than the frequency split point, and the high frequency may indicate a higher frequency range. RRcnnn / eznz / E / YiAi -9 Frequency range that is greater than the 'frequency division' point. The frequency division point can be any value within an audible range that the user's ear can hear, for example, 500 Hz, 600 Hz, 700 Hz, 800 Hz, 1000 Hz, etc. In some modalities, if divided according to the principle of the acoustic driver, the acoustic driver may include, but is not limited to, a moving coil acoustic driver, a moving iron acoustic driver, a piezoelectric acoustic driver, an electrostatic acoustic driver, a magnetostrictive acoustic driver, etc. The acoustic driver may include a diaphragm. When the diaphragm vibrates, sound can be transmitted from the front and back sides of the diaphragm, respectively.The sound transmitted from the front side of the acoustic driver diaphragm and the sound transmitted from the rear side of the acoustic driver diaphragm can have the same amplitude but opposite phases. In this case, when the sounds transmitted from the front and rear sides of the acoustic driver diaphragm radiate outwards through the corresponding sound guide holes, the two parts of the sound can interfere during propagation, thus reducing sound leakage 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 can be arranged sequentially along the diaphragm's vibration direction.In some embodiments, the diaphragm can be installed in a reservoir frame, and the reservoir frame can be fixed to the magnetic circuit structure. Alternatively, the diaphragm can be directly connected and fixed to a side wall of the magnetic circuit structure. One side of the diaphragm, oriented away from the magnetic circuit structure, can form the front side of the acoustic driver. One side of the magnetic circuit structure, oriented away from the diaphragm, can form the rear side of the acoustic driver. The diaphragm can vibrate to cause the acoustic driver to radiate sound outward from the front and rear sides of the acoustic driver, respectively. The acoustic driver can also include a voice coil. The voice coil can be fixed to the side of the diaphragm.The moving coil is oriented towards the magnetic circuit structure and arranged in a magnetic field formed by the magnetic circuit structure. When energized, the moving coil can vibrate under the action of the body. RRcnnn / eznz / E / YiAi - 10 magnetic and make the diaphragm vibrate, thus generating sound. The vibration of the diaphragm can make the acoustic driver radiate sound from the front and back sides of the acoustic driver, respectively. The housing structure may be a closed housing structure or a closed structure with an internal cavity. The acoustic driver may be disposed within the housing structure. The housing structure may have a shape suitable for the user's ear. The shape of the housing structure may include a circular ring, an oval, a polygon (regular or irregular), a U-shape, a V-shape, a semicircle, etc., such that the housing structure can be anchored directly to the user's ear. In some embodiments, the housing structure may also include one or more fixing structures. The fixing structure may include an ear hook, a head strap, or an elastic band, which may be used to secure the acoustic output device to the user and prevent it from falling out.Just as an example, the attachment structure might be an ear hook designed to be worn around the user's ear. As another example, the attachment structure might be a neckband designed to be worn around the user's neck or shoulder. In some models, the ear hook might be a continuous, hook-shaped component that stretches elastically to fit the user's ear. In this case, the ear hook might also apply pressure to the user's auricle, thus securing the hearing aid in a specific position on the user's ear or head. In some models, the ear hook might be a discontinuous band. For example, an ear hook might include a rigid portion and a flexible portion. The rigid portion might be made of a rigid material (e.g., plastic or metal).The rigid portion can be attached to the housing structure of the acoustic output device via a physical connection (e.g., a pressure connection, a screw connection, etc.). The flexible portion can be made of elastic material (e.g., fabric, composite material, and / or neoprene). The housing structure may include at least one first sound guide hole and at least one second sound guide hole. The first sound guide hole and the second sound guide hole may be coupled responsively to the front and rear sides of the diaphragm in the same RRcnnn / rznz / E / YiAi - 11. Acoustic Controller. When the user operates the acoustic output device, the housing structure may position the first and second sound guide holes on the same side of the user's face. In some models, the front side of the acoustic controller (diaphragm) within the housing structure may include a front chamber for sound transmission. This front chamber may be acoustically coupled with the first sound guide hole. Sound transmitted from the front side of the acoustic controller may then be transmitted from the first sound guide hole through the front chamber. The rear side of the acoustic controller (diaphragm) within the housing structure may include a rear chamber for sound transmission. This rear chamber may be acoustically coupled with the second sound guide hole.The sound transmitted from the rear side of the acoustic driver can be transmitted from the second sound guide hole through the rear chamber. In some configurations, the structures of the front and rear chambers can be adjusted so that the sounds exiting the sound guide hole on the front side of the acoustic driver and the sound guide hole on the rear side of the acoustic driver meet a certain condition. For example, the lengths of the front and rear chambers can be designed so that sounds with a specific phase relationship (e.g., opposite phases) can exit from the sound guide hole on the front side of the acoustic driver and the sound guide hole on the rear side of the acoustic driver. As a result, the problem of far-field sound leakage from the acoustic output device can be effectively resolved.In some models, the shape of the sound guide hole may include, but is not limited to, a square, a circle, or a prism. In some scenarios, the housing structure may include a user contact surface. When the user interacts with the acoustic output device, the user contact surface may be close to or near the user's body part (e.g., face, head). For ease of description, the user contact surface may also be referred to as the user projection surface. The user projection surface can be understood as a surface of the housing structure with a larger projection area onto the user's body part, which may be closer to the user's body than the acoustic driver. When the user RRcnnn / eznz / E / YiAi - 12 When using the acoustic output device, the user contact surface can be considered substantially parallel to the part of the user's body (e.g., the face area) that is in direct contact with or facing the user contact surface. When the user uses the acoustic output device, regardless of whether the user contact surface is near but not in contact with the user's body part, or whether it is in contact with the user's body part, the acoustic output device can emit sound to the outside of the housing structure through the sound guide holes in the structure or housing, thus transmitting the sound to the user's ear. In some modalities, a user contact surface shape may include a regular shape such as a circle, ellipse, rectangle, triangle, rhombus, etc., or an irregular shape.In some embodiments, the user contact surface may be a smooth plane or may contain one or more raised or concave areas. In some embodiments, the user contact surface may include a layer of silicone material or a layer of hard plastic material (e.g., rubber, plastic, etc.). The silicone or hard plastic layer may be covered and bonded to the outer surface of the housing structure, or it may be integrally formed with the housing structure. It should be noted that the shape and structure of the user contact surface of the housing structure are not limited to the above description and may be adjusted according to specific conditions, which are not further detailed herein. Figure 1 is a schematic diagram illustrating two sound guide holes and a user contact surface of an enclosure structure according to some embodiments of the present exposition. As shown in Figure 1, in some embodiments, the at least two sound guide holes may include a first sound guide hole Bi and a second sound guide hole B. The first sound guide hole Bi and the second sound guide hole B may radiate sound outwards in a dipole or dipole-like manner. The distance from the first sound guide hole Bi to the user contact surface (the parallelogram in Figure 1 may represent the user contact surface) may be less than the distance from the second sound guide hole B to the user contact surface. A line connecting the first hole RRcnnn / eznz / E / YiAi - 13 of sound guide Bi and the second sound guide hole B; it may have an intersection A with the user contact surface. A normal vector of RRcnnn / eznz / E / YiAi the contact surface with the user on the bridge; A can be . A 'direction vector of the line connecting the first sound guide hole Bi and the second sound guide hole B; can be L. The 'direction vector L can be the direction from the first sound guide hole Bi to the second; sound guide hole; B;. The 'direction vector Λ of the line connecting the first sound guide hole Bi and the second hole of F sound guide B; may have an angle; γ with the normal vector 'of the contact surface; with the user; at point; A. In some models, when the user operates the acoustic output device, the contact surface with the user may be substantially parallel to the part of the user's body (e.g., the face area) that is in direct contact with or facing the user's contact surface. For descriptive convenience, the following description uses the user's face area as an example of the user's body part. That is, the contact surface of the acoustic output device with the user may be coincidentally parallel to the face area. In this case, the angle ratio between the face area and the line of connection between the at least two sound guide holes may be essentially equivalent to the angle ratio between the contact surface with the user and the line of connection between the at least two sound guide holes. In some embodiments, the line of connection between the at least two sound guide holes may be approximately perpendicular to the face area; i.e., the line of connection between the at least two sound guide holes may be approximately perpendicular to the contact surface with the user. The "approximately perpendicular" mentioned herein may mean that an angle, inclusive, between the contact surface with the user and the line connecting the first sound guide hole B and the second sound guide hole B is in the range of 75° to 90°. In the embodiments of the present disclosure, the angle, inclusive, between the contact surface with the - 14 user and the connecting line between the at least two 'sound guide holes' can refer to a complementary angle of an included angle (v) formed between the 'direction' vector and the normal vector of the contact surface with the user at point A. For example, when the included angle between the line connecting the first sound guide hole Bi and the second sound guide hole B; and the contact surface with the user is within a range of 75° to 90°, the angle included between the direction vector (O) representing the line connecting the first sound guide hole (Bi) and the second sound guide hole (Bz) and the apparent vector of the user contact surface at point A can be in a range of 0° to 15°. Just as an example, in the case where the user contact surface is in contact with the user's body, to make the line connecting the first sound guide hole (Bi) and the second sound guide hole (Bz) approximately perpendicular to the part in contact with the user's body, the first sound guide hole (Bi) and the second sound guide hole (Bz) <de sonido Bz pueden ubicarse en un lado, de la estructura 'del alojamiento .que es perpendicular o aprozirradamente perpendicular a la superficie de contacto con el usuario al mismo tiempo.As another example, when the user contact surface is close to, but not in contact with, the user's body part, in order to make the line connecting the first sound guide hole Bi and the second sound guide hole Bz approximately perpendicular to the part in contact with the user's body, the first sound guide hole Bi and the second sound guide hole Bz can be located on the side of the housing structure that is perpendicular or approximately perpendicular to the user contact surface at the same time, or alternatively, the first sound guide hole Bi can be located on the user contact surface, and the second sound guide hole Bz can be located on a side of the housing structure opposite the user contact surface.Preferably, the included angle between the connection line between the at least two sound guide holes and the user contact surface can be 90°. At this time, the included angle γ between the vector. RBcnnn / eznz / E / YiAi of direction Λ(representing the line connecting the first guide hole of - 15 P sound and the second sound guide hole) and the normal vector of the contact surface, with the user at point A, can be 0°. When the line of connection between at least two sound guide holes is approximately perpendicular to the face area, the sounds emitted by the acoustic output apparatus from the two sound guide holes can be reflected by the user's face area. In the far-field space, the reflected sound can interfere with the sound radiated directly by the acoustic output apparatus, thus reducing far-field sound and improving far-field sound leakage. In some configurations, the front side of the acoustic controller's diaphragm and the housing structure can form a first chamber. The rear side of the acoustic controller and the housing structure can form a second chamber. The front side of the acoustic controller can radiate sound into the first chamber, and the rear side of the acoustic controller can radiate sound into the second chamber. <diar sonido hacia la segunda cámara. En algunas modalidaoes, la estructura de alojamiento p.uede incluir además el primer orificio de 'guía de sonido y el segundo orificio de guía de sonido. El p.rimer orificio de guía de sonido p.uede comunicarse con la p.rimera cámara. El segundo orificio de guía de sonido puede comunicarse con la segunda cámara. El sonido generado en el lado frontal del controlador acústico puede propagarse hacia el exterior a través 'del primer orificio de guía de sonido.The sound generated at the rear of the acoustic driver can propagate outwards through the second sound guide hole. In some embodiments, the magnetic circuit structure may include a magnetic conductive plate arranged opposite the diaphragm. The magnetic conductive plate may include at least one sound guide hole (also known as a pressure relief hole) configured to guide the sound generated by the diaphragm's vibration from the rear of the acoustic driver and propagate the sound outwards through the second chamber. The acoustic output apparatus can form a dual point sound source (or a multiple point sound source) similar to a dipole structure through the sound radiation from the first and second sound guide holes, and generate a specific sound field with a certain directivity. In some configurations, the front side of the acoustic driver and the housing structure can form a chamber. The front side of the RRcnnn / eznz / E / YiAi - 16. The acoustic driver can radiate sound into the chamber, and the rear side of the acoustic driver can radiate sound directly to the outside of the acoustic output device. In some embodiments, the housing structure may include one or more sound guide holes. The sound guide hole(s) can be acoustically coupled with the chamber and guide the sound radiated by the acoustic driver from the front side of the chamber to the outside of the acoustic output device. In some embodiments, the magnetic circuit structure may include a magnetic conductor plate disposed opposite the diaphragm. The magnetic conductor plate may include one or more sound guide holes (also known as pressure relief holes).The sound guide hole(s) can guide the sound generated by the diaphragm's vibration from the rear of the acoustic driver to the outside of the acoustic output device. Since the sound guide holes on the front and rear of the acoustic driver are located on either side of the diaphragm, the sound guided by the sound guide holes on the front and the sound guided by the sound guide holes on the rear can be considered to be in opposite or approximately opposite phase. Therefore, the sound guide holes on the front and rear of the acoustic driver can form a dual point sound source. In some embodiments, the rear side of the acoustic driver and the housing structure may form a chamber. The rear side of the acoustic driver may radiate sound into the chamber, and the front side of the acoustic driver may radiate sound directly out of the acoustic output device. In some embodiments, the magnetic circuit structure may include a magnetic conductive plate arranged opposite the diaphragm. This magnetic conductive plate may include one or more sound guide holes (also known as pressure relief holes). The sound guide hole(s) may guide the sound generated by the diaphragm's vibration from the rear side of the acoustic driver to the chamber. In some embodiments, the housing structure may include one or more sound guide holes.The sound guide hole(s) can be acoustically coupled with the chamber and guide the sound radiated by the acoustic driver to the chamber and out of the acoustic output device. In some. RRcnnn / rznz / E / YiAi - 17 modalities, one or more sound guide holes can be arranged on the side wall of the housing structure near the magnetic circuit structure. For example, when the user operates the acoustic output device, the diaphragm can be oriented towards the human ear, and a connecting line between one or more sound guide holes and a central position on the front side of the diaphragm can be approximately perpendicular to the user's face. As another example, when the user operates the acoustic output device, the diaphragm can be not oriented towards the human ear; the diaphragm can be located on the top or bottom of the housing structure, and one or more sound guide holes can be located in positions opposite to the...diaphragm in the housing structure, such that the line of connection between one or more sound guide holes and the center position of the front side of the diaphragm can be approximately parallel to the user's face. In some cases, the sound transmitted directly from the front side of the diaphragm to the outside and the sound guided from the sound guide holes can be considered to have opposite or approximately opposite phases, so the front side of the diaphragm and the sound guide holes can form a dual point sound source. In some embodiments, the acoustic output apparatus may include a first acoustic controller and a second acoustic controller. The first acoustic controller may include a first diaphragm. The second acoustic controller may include a second diaphragm. The first acoustic controller and the second acoustic controller may receive a first electrical signal and a second electrical signal, respectively. In some embodiments, when the first electrical signal and the second electrical signal have the same magnitude and opposite phases (e.g., the first acoustic controller and the second acoustic controller are electrically connected to a signal source with opposite polarity, with respect to the variable, and receive the same original sound electrical signal emitted by the signal source), the first diaphragm and the second diaphragm may generate sounds with opposite phases.Furthermore, the housing structure can accommodate the first and second acoustic drivers. The sound generated by the vibration of the first diaphragm can be radiated outwards through the first sound guide hole in the housing structure. The sound generated by the vibration of the second diaphragm can be radiated outwards through the second sound guide hole in the housing structure. RRcnnn / eznz / E / YiAi - 18 Housing structure. For ease of description, the sound generated by the vibration of the first diaphragm can be referred to as the sound generated by the front side of the first acoustic driver. The sound generated by the vibration of the second diaphragm can be referred to as the sound generated by the front side of the second acoustic driver. When the sound generated by the vibration of the first diaphragm and the sound generated by the vibration of the second diaphragm are radiated directly outwards through the first and corresponding second sound guide holes, the first and second sound guide holes can be approximated as a dual sound source (e.g., a dual point sound source). In some embodiments, the first sound guide hole may be arranged opposite the second sound guide hole.For example, when the user is using the acoustic output device, the first sound guide hole can be oriented towards the human ear, and the connecting line between the first and second sound guide holes can be approximately perpendicular to the user's face. Alternatively, when the user is using the acoustic output device, the side wall of the device adjacent to the side wall where the first or second sound guide hole is located can be oriented towards the human ear, and the connecting line between the first and second sound guide holes can be approximately parallel to the user's face. In some configurations, the first and second acoustic controllers may be identical or similar, such that their amplitude-frequency responses across the entire frequency band are the same or similar. In other configurations, the first and second acoustic controllers may be different. For example, the frequency responses of the first and second acoustic controllers may be identical or similar in a mid-to-high frequency band. The frequency responses of the first and second acoustic controllers may be different in a low-frequency band. In some configurations, the first acoustic controller may be located in the first chamber. The first acoustic controller may include the first diaphragm. RRcnnn / eznz / E / YiAi- 19 The front side of the first acoustic driver and the housing structure can form a first front chamber. The rear side of the first acoustic driver and the housing structure can form a first rear chamber. The front side of the first acoustic driver can radiate sound into the first front chamber. The rear side of the first acoustic driver can radiate sound into the first rear chamber. The second acoustic driver can be located in the second chamber. The front side of the second acoustic driver and the housing structure can form a second front chamber. The rear side of the second acoustic driver and the housing structure can form a second rear chamber. The front side of the second acoustic driver can radiate sound into the second front chamber. The rear side of the second acoustic driver can radiate sound into the second rear chamber.In some configurations, the first and second chambers may be identical. The first and second acoustic controllers may be arranged in the first and second chambers, respectively, in the same way, such that the first front and second front chambers may be identical. The first rear and second rear chambers may also be identical. Therefore, the acoustic impedances of the front or rear sides of the first and second acoustic controllers may be the same. In other configurations, the first and second chambers may be different. The impedances of the front or rear sides of the first and second acoustic controllers may be made equal by varying the size and / or length of the chambers or by adding a sound guide tube. The first acoustic controller may include a first diaphragm.The second acoustic driver may include a second diaphragm. At this time, the acoustic impedance of the first 'diaphragm' and one sound guide hole of at least two sound guide holes may be the same as the acoustic impedance of the second 'diaphragm' and the other sound guide hole of at least two sound guide holes. In some embodiments, an acoustic damping structure (e.g., a metal filter mesh, gauze mesh, tuning net, tuning cotton, sound guide tube, etc.) may be provided in the sound guide bore to reduce the amplitude of the frequency response corresponding to the front or rear side of the acoustic controller. RRcnnn / eznz / E / YiAi -20 such that the amplitude of the frequency response corresponding to the front side of the acoustic controller can be close to or equal to the amplitude of the frequency response corresponding to the rear side of the acoustic controller. Figure 2 is a schematic diagram illustrating a dipole according to some modalities of the present exposition. Figure 3 is a diagram of the basic principle of a dipole and a contact surface with the user according to some modalities of the present exposition. To better illustrate the influence of the arrangement of the sound guide holes of the acoustic output apparatus on the sound output effect of the acoustic output apparatus, and considering that sound can be estimated to propagate outwards from the sound guide holes, each sound guide hole of the acoustic output apparatus can be considered as a sound source emitting sound outwards.Simply for the sake of description and illustration, when the size of each of the sound guide holes of the acoustic output apparatus is relatively small, each sound guide hole can be considered approximately as a point sound source. As shown in Figure 2 and Figure 3, the two sound guide holes of the acoustic output apparatus can be considered as two point sound sources. The radiated sounds can have the same amplitude and opposite phases, which can be represented by and respectively. The two sound guide holes can form a dipole, and the sounds radiated outwards can have obvious directivity, forming a 3-shaped sound radiation region.In the direction of a straight line connecting the sound guide holes, the sounds radiated by the sound guide holes may be the loudest, and the sounds radiated in the other directions may be obviously reduced. The two sound guide holes can generate different sounds at different points in space, which can be calculated according to an angle Θ between two lines, one of which is a connecting line between a midpoint of the connecting line of the two sound guide holes and any point in space, the other line being the connecting line of the two sound guide holes. In some embodiments, any sound guide hole arranged in the acoustic output apparatus to emit sound may be considered approximately as a sound source. RRcnnn / eznz / E / YiAi single point of the acoustic output device. An acoustic pressure of a field - 21 sound, generated by a point ionic sound source, can be represented by the equation: RRcnnn / eznz / E / YiAi p _ hl!e¡ (ut-kr) , (1 ) r μι where r denotes the acoustic pressure amplitude, r denotes an angular frequency, r denotes the distance between a point in space and the sound source, and κ denotes a wave number. The magnitude of the acoustic pressure of the sound field of the point sound source can be inversely proportional to the distance between the point in space and the point sound source. The sound radiated by the acoustic output device into the surrounding environment (i.e., the filtered, far-field sound) can be reduced by arranging at least two sound guide holes in the acoustic output device to create a dual point sound source. In some embodiments, the acoustic output device may include at least two sound guide holes, i.e., the dual point sound source. The sound output through the two sound guide holes may have a certain phase difference. When the positions and phase difference of the dual point sound source meet certain conditions, the acoustic output device may exhibit different sound effects in the near field and the far field. For example, when the phases of the sound sources...When the phase differences between the two sound guide holes are opposite, that is, when the absolute value of the phase difference between the two point sound sources is 180°, the filtered far-field sound can be reduced according to the principle of anti-phase cancellation of sound waves. As shown in Figure 2, the center distance between the sound guide holes of the acoustic output device can be d, which can form a dipole (the dipole can be considered as a combination of two pulsating spheres with opposite phases at a distance d). At this moment, the acoustic pressure of a target point P in the space produced by the acoustic output device can be represented by the equation: p=lA!.e;(t-k'+) _hlle7(tb·-) (2) r+r_ μA where A denotes the diaphragm vibration intensity, μι+intensity of the point sound source +, J_L indicates the intensity of the r_ - 22 point sound source, co indicates the angular frequency, κ indicates the number of waves, r+ indicates the distance between the target point and the point sound source +, and r- indicates the distance between the target point and the point sound source. When simply considering the body of sound in the far field, and assuming r » d, the amplitude difference between the sound waves radiated by the two point sound sources <que alcanzan el punto objetivo puede ser muy pequeña, y las amplitudes r+ y r~ en la ecuación anterior pueden reemplazarse por r, puro la 'diferencia de fase no puede ignorarse y tiene una relación aproximada de la siguiente manera: d r+~ r + — cos Θ d r_ ~ r--cos Θ 2 (3) where r denotes the distance between any target point p in space and a central position of the dual point sound source, d denotes the distance between the two point sound sources, θ denotes an angle included between the straight line where the dual point sound source is located and the connecting line between the target point p and the center of the dual point sound source. According to the above equations, when the frequency is not very high, kd < 1, equation (2) can be simplified as: klAld . , „ p ~—i-----cos9eAwt k'> (4) r According to equation (4), the acoustic pressure of the target point in the sound field can be related to the included angle Θ between the straight line where the dual point sound source is located and the connecting line between the target point and the center of the dual point sound source and the 'distance RRcnnn / eznz / E / YiAi between the two point sound sources. Figure 4 is a schematic diagram illustrating the reflection of a dipole with respect to the area of ​​the user's face, according to some modalities of the present exposition. Figure 5 is a diagram of the equivalent basic principle illustrating the reflection formed by an area of ​​the user's face to the sound from a dipole, according to some modalities of the present exposition. As shown in Figure 4 and Figure 5, when the user operates the acoustic output apparatus, at least two sound guide holes of the output apparatus -23Acoustics can be considered as a dual point sound source. Two sound sources can emit sounds with the same amplitude and opposite phases respectively (represented by the symbols + and respectively), which can form a dipole. In this case, at any spatial point in the environment where the user is located, if the distances between the spatial point and the two sound sources are equal, based on the cancellation of sound interference, the volume of the sound at this point can be very small. When the distances from the spatial point to the two sound sources are not equal, the greater the difference in distance, the greater the volume of the sound at the point. At an angle; Included between a connecting line of the two single-point sound sources and an area of ​​the face (for simplicity, a plane in which an area of ​​the user's face is located, i.e., is directly aligned with or oriented towards the acoustic output device, is equivalent to the face area) is in a range of 70° to 90°, it may be considered that the connecting line between the two single-point sound sources is approximately perpendicular to the face area. In some modalities, when the user is using the acoustic output device, the contact surface with the user on the housing structure of the acoustic output device may be substantially parallel to the face area, and at this time, the two single-point sound sources may also be considered approximately perpendicular to the contact surface with the user.To facilitate understanding, as shown in Figure 4, the face area can be abstracted as a baffle 410. The distance between the two single-point sound sources lined with at least two sound guide holes in the acoustic output apparatus can be denoted as d. The smallest distance between the two single-point sound sources and the baffle 410 can be denoted as D. When the two single-point sound sources generate sounds, some of the sounds may be radiated directly into the environment, and the other part of the sounds may be first radiated to the baffle 410, reflected by the baffle 410, and then radiated into the environment. In an ideal situation, in the presence of the baffle, the sound radiation effect of the two single-point sound sources in the environment can be equivalent to the basic principle diagram in Figure 5.As shown in Figure 5, the source of sound; dual point formed by the two orifices, the sound guide; of the hurry; the acoustic exit can form a diputen, listen, it can be turned on the right side; of. RRcnnn / eznz / E / YiAi - 24 a “deflector 510. The distance between the dual point sound source can be d. The distances from the dual point sound source to the deflector 510 may not be equal. The smallest distance between the dual point sound source and the deflector 510 may be D. An angle between a straight line where the dual point sound source is located and a connecting line between the center of the dual point sound source and any observation point P in space may be Θ. The distance from the center of the point sound source to the observation point P may be ry. Considering that the sound output of the dual point sound source may be reflected by the deflector 510, it is equivalent to forming a virtual dual point sound source on the left side of the deflector with the same amplitude as the point sound source and opposite phases to the dual point sound source.The virtual dual point sound source can form a dipole. The distance between the virtual dual point sound source can be d. The smallest distance between the virtual dual point sound source and the deflector 510 can be D. The distance between the center of a connecting line of the virtual dual point sound source and the observation point P can be n. The virtual dual point sound source and the dual point sound source can form a dual dipole. An included angle between the deflector and a connecting line between the observation point and the center of the dual dipole can be oí. The distance between the center of the dual dipole and the observation point can be r. The acoustic pressure at the observation point can be represented by the equation: RRcnnn / eznz / E / YiAi fc|4|d . k[A[dp = —j-----eos Θ e1(wt+ j----ri r2cosee^wt~kr^ In the far field, the amplitude difference of the acoustic waves at the observation point P can be ignored and the phase difference can be conserved. If the angle between a normal line at the center of the dual dippole and the connecting line between the observation point and the center of the dual dippole is α, then Γ, according to the figure, is α, and the approximate relationship can be represented as follows: dy - y + ¡ l) + — but a , (6) d y-. - y - D -t — ¡ cen tí • (7) -25The acoustic pressure can be obtained according to equations (5), (o) and (7) above and equation (8) below, and the synthesized acoustic pressure is the acoustic pressure produced by the two single point sound sources in the environment when a deflector exists: 2 / c|.í|íí ti p-~------e-·r'' felt set'l Áí D +—. sena qq RRcnnn / eznz / E / YiAi Figure 6 is a frequency response curve graph of acoustic output devices with two point sound sources at different distances d and different distances D when the two point sound sources are arranged as shown in Figure 4, in accordance with some modalities of the present exposition. The distance D represents the smallest distance from a dual point sound source to the user's face area. Figure 7 is a sound field energy distribution diagram of two point sound sources at 1000 Hz when the two point sound sources are arranged as shown in Figure 4, in accordance with some modalities of the present exposition. As shown in Figure 6 and Figure 7, the connecting line between at least two sound guide holes of the acoustic output device may be perpendicular to the user's face area (i.e.,(perpendicular to the contact surface with the user, which is parallel or substantially parallel to the user's face area). When the far-field observation point is located 250 mm away, the sound pressure values ​​can be tested respectively when D is 0 mm, 1 mm, 2 mm, or 3 mm, and the corresponding d is 0.5 mm, 1 mm, 1.5 mm, or 2 mm. The sound pressure value can be expressed as a sound pressure level (dB). It can be observed in Figure 6 that the smallest distance between the dipole and the deflector is in the range of 0 mm to 5 mm. The distance between the dipole and the deflector, and the distance between the dipoles, can have an impact on the sound pressure at the far-field observation point. Furthermore, the acoustic pressure level at the far-field observation point may decrease as the distance between the dipole and the deflector decreases.The sound pressure level at the far-field observation point can decrease as the distance between the dipole decreases. When the distance between the dipole and the deflector is 0, and the distance between the dipoles is 0.5, the sound pressure level at the far-field observation point can be the smallest. The effect of reducing sound leakage can be relatively good at this time. As shown in Figure 7, when the connection line between the at least two sound guide holes of the acoustic output apparatus is approximately perpendicular to the contact surface of the user's body, the smallest distance between the dipole and the deflector is 3 mm, the distance between the dipole is 0.1 mm, and the frequency is 1 kHz, the region outside a closed circle with a radius of 250 mm can be a distant sound field, and it can be seen that the color of the sound pressure level in the distant sound field is relatively light, i.e., the sound pressure level of the distant sound field can be relatively small, and the filtered sound from the distant field can be relatively small.In some embodiments, the volume of filtered far-field sound from the acoustic output device can be reduced by adjusting the distance between a sound guide hole and the user's contact surface or face area. The at least two sound guide holes may include a first and a second sound guide hole. The distance from the first sound guide hole to the user's face or contact surface may be less than the distance from the second sound guide hole to the same area. Preferably, the distance from the first sound guide hole to the user's contact surface may be less than or equal to 5 mm. More preferably, the distance from the first sound guide hole to the user's contact surface may be less than or equal to 5 mm.sound guide; to the contact surface; with the user, may be less than or equal to 2 mm. More preferably, the first sound guide hole may be disposed on the contact surface; with the user. In other: embodiments, the user's body part may function as a deflector. The positional relationship between the first sound guide hole, the second sound guide hole, and the contact surface with the user may also be applicable to the positional relationship between the first sound guide hole, the second sound guide hole, and the user's body part (e.g., face area). For example, in some embodiments, when the user uses the acoustic output device (i.e., when the contact surface with the user in the housing structure is near or adjacent to the face area), the distance.from the first sound guide hole to the user's body part; may be less than the distance from the second sound guide hole to. RRcnnn / eznz / E / YiAi - 27 the user's body part. Preferably, the distance from the first sound guide hole to the user's body part may be less than or equal to 5 mm. More preferably, the distance from the first sound guide hole to the user's body part may be less than or equal to 2 mm. It should be noted that the user's body part refers to the part with the largest projection area of ​​the contact surface on the user's body when the user is wearing the acoustic output device. In some embodiments, the volume of the far-field filtered sound from the acoustic output device may be reduced by adjusting the distance between the two sound guide holes. The distance between the first sound guide hole and the second sound guide hole may be less than or equal to 5 mm. Preferably, the distance between the first sound guide hole and the second sound guide hole.The sound guide can be less than or equal to 2 mm. More preferably, the distance between the first sound guide hole and the second sound guide hole can be less than or equal to 0.5 rrm. Figure 8 is a schematic diagram illustrating the position of a dipole with respect to the user's face area according to some modalities of the present presentation. Figure 9 is an equivalent basic diagram illustrating the reflection formed by the user's face area to the sound of a dipole according to some modalities of the present presentation. As shown in Figure 8 and Figure 9, when the user uses the acoustic output device, at least two sound guide holes of the acoustic output device can be considered as two single point sound sources and can form a dual point sound source. The two single point sound sources can emit sounds with the same amplitude and opposite phases (represented by the symbols + and respectively) to form a dipole.In this case, for any spatial point in the environment where the user is located, when the distances between the spatial point and the two single point sound sources are equal, according to the cancellation of sound interference, the sound volume at this point can be very small. When the distances from the spatial point to the two single point sound sources are not equal, the greater the distance difference, the greater the sound volume at the point. When an angle is included between a connecting line of the two single point sound sources and an area of ​​the face (for simplicity, a plane where). RRcnnn / rznz / E / YiAi -28 The area of ​​the user's face that is directly facing or oriented towards the acoustic output device is equivalent to the face area. It is located in a range of 0° to 15°. The line of connection between the two single-point sound sources can be considered approximately parallel to the face area. In some modalities, when the user is using the acoustic output device, the contact surface with the user on the housing structure of the acoustic output device may be substantially parallel to the face area, and at this time, the two single-point sound sources can also be considered approximately parallel to the contact surface with the user. For ease of understanding, as shown in Figure 8, the face area can be abstracted as a baffle.The distance between the two single-point sound sources formed by at least two sound guide holes in the acoustic output apparatus can be d. The closest distance between one of the two single-point sound sources and the deflector can be D. When two single-point sound sources generate sounds, some of the sounds can radiate directly into the environment, and some of the sounds can first radiate toward the deflector, reflect off the deflector, and then radiate into the environment. In an ideal situation, in the presence of the deflector, the sound radiation effect of the two single-point sound sources in the environment can be equivalent to the basic principle diagram in Figure 9. As shown in Figure 9, the dual point sound source formed by the two sound guide holes of the acoustic output apparatus can form a dipole, which can be located on the right side of a deflector.The obstruction between the dual point sound source and the deflector can be d. The distances from the dual point sound source to the deflector can be equal. The smallest obstruction between the dual point sound source and the deflector can be D. An angle between a straight line where the dual point sound source is located and a connecting line between the center of the dual point sound source and any observation point P in space can be Θ. The distance from the center of the dual point sound source to the observation point P can be d. Considering that the sound output of the dual point sound source can be reflected by the deflector, it is equivalent to forming a virtual dual point sound source on the left side of the deflector with the same amplitude and phase as the dual point sound source. The virtual dual point sound source can form a dipole. The obstruction between the source. RRcnnn / eznz / E / YiAi The distance between the virtual dual point sound source and the baffle can be d. The smallest distance between the virtual dual point sound source and the baffle can be D. The distance between the center of a connecting line of the virtual point sound source and the observation point P can be rq. The virtual dual point sound source and the dual point sound source can form a dual dipole. An included angle between the baffle and a connecting line between the observation point and the center of the dual dipole can be oí. The distance between the center of the dual dipole and the observation point can be r. The acoustic pressure at the observation point can be represented by the following equation (9): p = —j-----eos Θ eFwt k' ú — j-----eos Θ eFwt k'U (cgri r2 In the far field, the amplitude difference of the acoustic waves at the observation point P can be ignored and the phase difference can be preserved. If the angle between a normal at the center of the dual dipole and the connecting line between the observation point and the center of the dual dipole is α, then, according to the Figure, θ«Όί, and the approximate relationship is represented as follows: RRcnnn / eznz / E / YiAi ?· - r + I) sin a di) The synthesized acoustic pressure can be obtained based on the above equations (9), (10) and (11) and the following equation (12): k|.í|i / sin í 2iD sin. a ; ' sin. kl) sin a> ©© Figure 10 is a frequency response curve graph of acoustic output devices with two point sound sources at different distances d when the two point sound sources are arranged as shown in Figure 8, according to some modalities of this exposition. Figure 11 is a sound field energy distribution diagram of two point sound sources at 1000 Hz when the two point sound sources are arranged as shown in Figure 8, according to some modalities of this exposition. As shown in Figure 10 and Figure 11, the connecting line between at least two guide holes of The sound from the acoustic output device can be approximately parallel to the user's face area (i.e., perpendicular to the surface of contact with the user, or parallel or substantially parallel to the user's face area). When the far-field observation point is located at a distance of 250 mm, the acoustic pressure values ​​can be tested respectively when D is 0 mm, 1 mm, 2 mm, or 3 mm, and the corresponding d is 0.5 mm, 1 mm, 1.5 mm, or 2 mm. The acoustic pressure value can be expressed by a sound pressure level (dB).It should be noted that when the line of connection between the first sound guide hole and the second sound guide hole is approximately parallel to the user's face area or the user contact surface, the distance from the first sound guide hole to the user's face area or the user contact surface and the distance from the second sound guide hole to the user's face area or the user contact surface may be equal or substantially equal. Being substantially equal herein may mean that the difference between the distance from the first sound guide hole to the user's face area (or the user contact surface) and the distance from the second sound guide hole to the user's face area (or the user contact surface) is within a specific range.The specific range herein may be less than or equal to 5 mm, less than or equal to 3 mm, or less than or equal to 1.5 mm. Simply by way of example, the at least two sound guide holes may include the first sound guide hole and the second sound guide hole. The distance from the first sound guide hole to the face area or contact surface with the user may be close to the distance from the second sound guide hole to the face area or contact surface with the user. Preferably, the distance from the first sound guide hole to the contact surface with the user may be less than or equal to 5 mm. More preferably, the distance from the first sound guide hole to the contact surface with the user may be less than or equal to 2 mm.It can be observed in Figure 10 that the maximum distance between the diplopedus and the deflector is in the range of 0 mm to 5 mm. The distance between the diplopedus can have a great impact on the acoustic pressure of the far field at the far field observation point. In addition, the acoustic pressure level of the far field at the field observation point. RRcnnn / eznz / E / YiAi The far-field sound can decrease as the distance between the dipoles decreases. When the distance between the dipoles is 0.5 mm, the far-field sound pressure level at the far-field observation point can be the smallest, and the sound leakage reduction effect can be relatively good at this time. In some modalities, the volume of the far-field filtered sound from the acoustic output device can be reduced by adjusting the distance between the sound guide hole and the contact surface with the user or the user's face area. The at least two sound guide holes can include the first and second sound guide holes.The distance from the first sound guide hole to the user's face or contact surface may be less than the distance from the second sound guide hole to the user's face or contact surface. Preferably, the distance from the first sound guide hole to the user's contact surface may be less than or equal to 5 mm. More preferably, the distance from the first sound guide hole to the user's contact surface may be less than or equal to 2 mm. Both the first and second sound guide holes may be located on the user's contact surface, or the first and second sound guide holes may be located respectively on two side walls adjacent to the user's contact surface in the housing structure.As shown in Figure 10, when the connecting line between the at least two sound-guide holes of the acoustic output apparatus is approximately parallel to the area of ​​the user's face and body, the smallest distance between the dipole and the deflector is 3 rrm, the distance between the dipole is 0.5 rrm, and the frequency is 1 kHz, the region outside a semicircle with a radius of 250 rrm can be the far sound field, and it can be seen that the color in the sawtooth area P of the near sound field is relatively dark, i.e., the sound pressure level in this area of ​​the near sound field can be relatively large, and the volume of the near field sound can be relatively large. In the direction perpendicular to the connection line of the dipole, the color of a part of the area is lighter, that is, the acoustic pressure level of the sound field in this area is lower and the sound leakage is less.In this case, the volume of the filtered sound from the distant carrpo of the acoustic output apparatus can be reduced by adjusting the distance between the two guide holes. RRcnnn / eznz / E / YiAi -32 sound. The distance between the first sound guide hole and the second sound guide hole may be less than or equal to 2 mm. Preferably, the distance between the first sound guide hole and the second sound guide hole may be less than or equal to 0.5 ron. Figure 12 is a graph of the acoustic pressure curve of an included angle between a connecting line of two sound guide holes and a surface of RRcnnn / eznz / E / YiAi contact with the user or a part of the user's body under different conditions according to some modalities of the present exposition. A dipole formed by at least two sound guide holes of the acoustic output apparatus corresponding to Figure 12 may have a 'minimum distance of 3 mm from the part of the user's body (deflector). The distance between the dipoles can be 0.5 mm. A far-field region can be a region other than a circle with the dipole center as its origin and a radius of 250 mm. In the figure, the horizontal axis can be the angle between an observation point in the far-field region and the dipole center, and the vertical axis can be the acoustic pressure at the observation point. The solid line in the figure can be a curve relating an absolute value of the acoustic pressure at the far-field observation point to the observation angle (an angle between a normal line at the center of the dual dipole and a connecting line between the observation point and the center of the dual dipole) when the connecting line between the at least two sound-guide holes of the acoustic output apparatus is approximately perpendicular to the area of ​​the user's face. The acoustic pressure at the observation point gradually decreases as π increases. When the observation angle is — in the far field region, the observation angle can be increased by π in a range from 0 to — . That is, when the connecting line between the far-field observation point and the center of the dipole is perpendicular to the deflector, the absolute value of the acoustic pressure can be at its maximum. The acoustic pressure at the observation point in the far-field region can gradually decrease as the angle between the observation point and the center of the dipole decreases. 7Γ center of the clippole increases in a range from - to π. The dotted line in the figure may be a curve relating the absolute value of the acoustic pressure at the far-field observation point and the observation angle when the dipole formed by the two sound-guide holes of the acoustic output apparatus is approximately parallel to the area of ​​the user's face. The acoustic pressure at the observation point in the far-field region may decrease -33 gradually as the angle between the observation point and the center of the π π dipole increases in a range from 0 to — . When the observation angle -o— , that is, when the connecting line between the far-field observation point and RRcnnn / eznz / E / YiAi the center of the 'dipole is perpendicular to the deflector, the absolute value of the acoustic pressure can be the minimum. The acoustic pressure at the observation point in the far-field region may gradually increase as the angle between the observation point and the center of the dipole in a range of π increases. The absolute value of the maximum acoustic pressure when the dipole formed by the at least two sound guide holes of the acoustic output apparatus is approximately perpendicular to the user's face area may be less than the absolute value of the maximum acoustic pressure when the dipole formed by the at least two sound guide holes of the acoustic output apparatus is approximately parallel to the user's face area. Figure 13 is a schematic structural diagram illustrating an exemplary acoustic output apparatus according to some embodiments of this disclosure. In some embodiments, the sound guide holes in Figure 13 may be suitable for forming a dual point sound source or a dipole as described elsewhere in this disclosure. As shown in Figure 13, the acoustic driver 1200 may include a diaphragm 1201 and a magnetic circuit structure 1222. The acoustic driver 1200 may also include a moving coil (not shown). The moving coil may be fixed to one side of the diaphragm 1201 near the magnetic circuit structure 1222 and positioned within a magnetic field formed by the magnetic circuit structure 1222. When energized, the moving coil may vibrate under the action of the magnetic field and cause the diaphragm 1201 to vibrate, thereby generating sound.For ease of description, one side of the 'diaphragm' 1201 is oriented away from the magnetic circuit structure 1222 (i.e., the right side of diaphragm 1201 in Figure 13) and can be considered as the front side of the acoustic controller 1200. One side of the magnetic circuit structure 1222 is oriented towards the outside of diaphragm 1201 (i.e., the left side of the magnetic circuit structure). 1222 in Figure 13) can be considered as the rear side of the acoustic controller 1200. Vibration of the diaphragm 1201 can cause the acoustic controller 1200 to radiate sound outwards from the front and rear sides of the acoustic controller, respectively. As shown in Figure 13, the front side or diaphragm 1201 of the acoustic controller 1200 and the The housing structure 1210 can form a first chamber 1211. The rear side of the acoustic controller 1200 and the housing structure 1210 can form a second chamber 1212. The front side of the acoustic controller 1200 can radiate sound into the first chamber 1211, and the rear side of the acoustic controller 1200 can radiate sound into the second chamber 1212. In some embodiments, the housing structure 1210 can further include a first sound guide hole 1213 and a second sound guide hole 1214. The first sound guide hole 1213 can communicate with the first chamber 1211. The second sound guide hole 1214 can communicate with the second chamber 1212. Sound generated on the front side of the acoustic controller 1200 can propagate outwards through the first sound guide hole 1213.The sound generated on the rear side of the acoustic driver 1200 can propagate outwards through the second sound guide hole 1214. In some embodiments, the magnetic circuit structure 1222 may include a magnetic conductor plate 1221 arranged opposite the diaphragm. The magnetic conductor plate 1221 may include at least one sound guide hole 1223 (also known as a pressure relief hole) configured to guide the sound generated by the vibration of the diaphragm 1201 from the rear side of the acoustic driver 1200 and propagate the sound through the second chamber 1212. The acoustic output apparatus can form a dual point sound source (or multiple sound sources) or a dipole structure through the sound radiation from the first sound guide hole 1213 and the second sound guide hole 1214, and generate a specific sound field with a certain directivity.In some configurations, the acoustic controller 1220 can emit sound directly from the outside; that is, the acoustic output device 1200 may not include the first chamber 1211 and / or the second chamber 1212. The clear sound from the front and rear sides of the acoustic controller 1220 can be used as a dual sound source. It should be noted that the acoustic output in the configurations described herein is not limited to the application of headphones and can also be applied to other audio output devices (e.g., a hearing aid, a microphone, etc.). Figure 14 is a schematic structural diagram illustrating another exemplary acoustic exit point according to some of the modalities of this exposition. Figure 15 is a schematic structural diagram illustrating a center RRcnnn / eznz / E / YiAi -35 Exemplary acoustic output apparatus according to some modalities of the present exhibition. As shown in Figure 14, a connecting line between a first sound guide hole 1313 of a first acoustic controller 1320 and a second sound guide hole 1314 of a second acoustic controller 1330 may be approximately perpendicular to a part of the user's body or a user-contact surface of the acoustic output apparatus. The first acoustic controller 1320 and the second acoustic controller 1330 may be the same acoustic controller. A signal processing module may control the front side of the first acoustic controller 1320 and the front side of the second acoustic controller 1330 via a control signal (e.g., a first electrical signal and a second electrical signal) to generate sounds whose phases and amplitudes satisfy a certain condition (e.g.(sounds with the same amplitude and opposite phases, sounds with different amplitudes and opposite phases, etc.). The sound generated from the front side of the first acoustic controller 1320 can be radiated outwards from the acoustic output device 1310 through the first sound guide hole 1313. The sound generated from the front side of the second acoustic controller 1330 can be radiated outwards from the acoustic output device 1310 through the second sound guide hole 1314. The first sound guide hole 1313 and the second sound guide hole 1314 can be equivalent to a dual sound source emitting sounds with opposite phases. Unlike the case where a dual sound source is constructed by means of sounds emitted p.Through the front and rear sides of the acoustic controller, via the front sides of the two acoustic controllers, i.e., the front side of the first acoustic controller 1320 and the front side of the second acoustic controller 1330, sounds with opposite phases can be generated and radiated outwards through the first sound guide hole 1313 and the second sound guide hole 1314. When the acoustic impedance of the p.If the acoustic impedance of the first acoustic controller 1320 to the first sound guide hole 1313 is equal or similar to the acoustic impedance of the second acoustic controller 1330 to the second sound guide hole 1314, the sounds emitted by the first sound guide hole 1313 and the second sound guide hole 1314 in the acoustic output apparatus 1310 can be constructed as an effective dual sound source, i.e., the first sound guide hole 1313 and the second sound guide hole 1314 can emit sounds with opposite phases with greater accuracy. In the far field, especially in a band of. RRcnnn / rznz / E / YiAi -36 mid-high frequency (e.g., 200 Hz-20 kHz): The sound emitted in the first sound guide hole 1313 and the sound emitted in the second sound guide hole 1314 can be better canceled out, which can better suppress the sound leakage of the acoustic output device in the mid-high frequency band to a certain extent, and can prevent the sound generated by the acoustic output device 1310 from being heard by other people close to the user, thus improving the sound leakage reduction effect of the acoustic output device 1310. When the front side of the first acoustic driver 1320 and the front side of the second acoustic driver 1330 are located on different sides of the housing structure, and the first sound guide hole 1313 and the second sound guide hole 1314 are also located on different sides of the housing structure 1310, the housing structure 1310 can act as a deflector between the dual sound source (i.e., the sound emitted by the first sound guide hole 1313 and the sound emitted by the second sound guide hole 1314). At this time, the housing structure 1310 can separate the first sound guide hole 1313 and the second sound guide hole 1314, so that the first sound guide hole 1313 and the second sound guide hole 1314 can have different acoustic paths to the user's ear canal.On the one hand, arranging the first sound guide hole 1313 and the second sound guide hole 1314 on both sides of the housing structure 1310 can increase the sound path difference between the first sound guide hole 1313 and the second sound guide hole 1314 (i.e., the path difference between the sounds emitted by the first sound guide hole 1313 and the second sound guide hole 1314 and reaching the user's ear canal), in such a way that the sound cancellation effect in the user's ear (i.e., the near field) is weakened, which increases the volume of the sound heard by the user's ear (also known as near field sound) and provides a better listening experience for the user.On the other hand, the housing structure 1310 may have little effect on the sounds transmitted through the sound guide holes to the environment (also known as 'far field' sound), and the far field sounds generated by the first sound guide hole 1313 and the second sound guide hole 1314 can be further canceled, which can suppress the sound leakage from the acoustic output apparatus 1300 to some extent, and at the same time can prevent the sound generated by the output apparatus from escaping. RRcnnn / eznz / E / YiAi -37acoustic 1300 can be heard by others near the user. Therefore, through the above arrangement, the listening volume of the acoustic output device 1300 in the near field can be improved and the sound leakage volume of the acoustic output device 1300 in the far field can be reduced. A general structure of the acoustic output apparatus shown in Figure 15 may be similar to that of the acoustic output apparatus shown in Figure 14. The difference between the general structures may be that the front side of the first acoustic driver 1320 is oriented downwards, the front side of the second acoustic driver 1330 is oriented upwards, the first sound guide hole 1313 in the housing structure 1310 is configured to emit the sound emitted by the front side of the first acoustic driver 1320, the second sound guide hole 1314 in the housing structure 1310 is configured to emit the sound emitted by the front side of the second acoustic driver 1330, and the connecting line between the dipole formed by the sound emitted by the first sound guide hole 1313 and the sound emitted by the second sound guide hole 1314 may be approximately p.parallel to the user's body part or the surface of contact with the user of the device) of acoustic output. In some embodiments, to improve the noise reduction effect of the acoustic output device, the acoustic output device may also include at least one microphone. The microphone may be configured to capture a noise signal from an external environment. The microphone may transmit the noise signal to a signal processing module of the acoustic output device. The signal processing module may generate a sound signal with an opposite phase and the same amplitude as the noise signal based on the parameters (such as phase and amplitude) of the noise signal, in order to achieve noise reduction. Figure 16 is a schematic structural diagram illustrating an exemplary acoustic output device according to some embodiments of the present embodiment. As shown in Figure 16, the connection line between the dipole formed by the sounds emitted through the two sound guide holes... <del aparato, de salida acústica 1600 (representado por + y cjue se muestra en la figura 16) es aproximadamente perpendicular al área cara del usuario., el micrófono 1601 p.uede ubicarse estructura alojamiento 1610 ap.arato q controlador acústico (e.g., una circuito magnético). en algunas modalidades, .disponerse rrcnnn eznz e yiai -38fuera o dentro pared lateral 1610. también puede lado periférico magnético. cuando capta ruido ambiente externo, para reducir sonido emitido propio aparato 1600, lejos orificio guia sonido, pjor ejemplo, 'diferente donde guía ubica además, línea conexión entre 'dipolo formado los sonidos dos orificios 'de usuario, aparate; tener un presión mínima (i.e., puntos 16 cerca puntos). el referirse a 'donde intensidad emitida relativamente pequeña. por las áreas color más claro 701 702 7. acústica. específicamente, como 16, fuente puntual dual formada p;or menos sonido; tres cangro sonoro fuertes campo 1621, 1622 camp.o 1623 que muestran puntos) pueden ocurrir simultáneamente. combinadas con 7 corresponder oscuro 703, 704 705) qie mnestran las rueden colores claros pueden disponerse uno micrófonos cpie preferentemente, linca central cl do 7, decir, líneas mostradas 16. al disponer p;resión -39del acústica, recibir menor cantidad posible miaño dispositivo mientras tal manera proporcionar ambiental realista procesarriento posterior señal realizar función corno reducción activa 1600. la fiqura 17 diagrama estructural esiguemático ilustra ejemplar acuerdo modalidades presente exposición. corro 17, emitidos aparato) 1700 17) paralela 1701 1710 'disponerse fuera 1710. aiñoiente 1700, .diferente p;aralela (i .e., paintos p.untos) . rránima cuandc>the connection line between the dual point sound source formed by at least two 'sound guide' holes of the acoustic output apparatus 1700 approximately parallel to the user's face area, two relatively strong sound field areas (e.g., area 1721 and area 1722 shown in Figure 17) and an area of ​​minimum sound pressure (i.e., the line of RRcnnn / eznz / E / YiAi -40 points and the area near the dotted line in Figure 16) can be presented simultaneously. In combination with Figure 11 and Figure 17, the relatively strong sound field areas 1721 and 1722 can correspond to two dark-colored areas 1102 and 1103 with a relatively large sound pressure level as shown in Figure 11. The area of ​​minimum sound pressure level can correspond to a light-colored area of ​​minimum sound pressure level 1101 as shown in Figure 11. One or more microphones 1701 can be arranged on the dotted line shown in Figure 17 and the area near the dotted line. Preferably, one or more microphones 1701 can be arranged on the dotted lines shown in Figure 17.By placing microphone 1701 in the minimum sound pressure area of ​​acoustic output device 1700, microphone 1701 can receive the least amount of sound possible from the acoustic device 1700 itself while capturing noise from the external environment, so that microphone 1701 can provide a more realistic ambient sound for subsequent sound signal processing to perform a function such as active noise reduction of the acoustic output device 1700. It should be noted that the acoustic output apparatus 1600 in Figure 16 and the acoustic output apparatus 1700 in Figure 17 are for illustrative purposes only. The acoustic output apparatus may also be an output apparatus with two acoustic controllers; for example, the acoustic output apparatuses shown in Figure 14 and Figure 15. That is, the selection conditions for the microphone positions (e.g., microphone 1601 and microphone 1701) may also be applicable to the acoustic output apparatus shown in Figure 14 and Figure 15. Having thus described the basic concepts, it may be quite evident to those skilled in the art after reading this detailed description that the preceding detailed description is intended only as an example and is not exhaustive. Various alterations, improvements, and modifications may occur and are intended for those skilled in the art, although not expressly indicated in this document. These alterations, improvements, and modifications are intended to be suggested by this exposition and are within the spirit and scope of the exemplary methods presented herein. Furthermore, certain terminology has been used to describe the modalities in this exposition. For example, the terms a modality, the modality, and / or some modalities signify a feature, structure, or characteristic. RRcnnn / eznz / E / YiAi -41 The particular feature described in relation to the modality is included in at least one modality of the present exposition. Therefore, it is emphasized and should be appreciated that two or more references to a modality or an alternative modality in various parts of this specification do not necessarily all refer to the same modality. Furthermore, the particular features, structures, or characteristics may be combined as appropriate in one or more modalities of the present exposition. Furthermore, a person skilled in the art will appreciate that the aspects of this disclosure may be illustrated and described herein in any of a number of patentable classes or contexts, including any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvement thereof. Accordingly, the aspects of this disclosure may be implemented entirely in hardware, entirely in software (including firmware, resident software, microcode, etc.), or by combining software and hardware implementation, which may generally be referred to herein as a data block, module, processor, unit, component, or system. In addition, the aspects of this disclosure may take the form of a computer program product embodied in one or more computer-readable media having computer-readable program code incorporated therein. A non-transient computer-readable signal medium may include a propagated data signal with a computer-readable program code incorporated therein, e.g., in baseband or as part of a carrier wave. Such a propagated signal may travel in any of a variety of ways, including electromagnetic, optical, or the like, or any suitable combination thereof. A computer-readable signal medium may be any computer-readable medium other than a computer-readable storage medium that can communicate, propagate, or carry a program for its execution in connection with an instruction-execution system, apparatus, or device.Program code embedded in a computer-readable signal medium may be transmitted using any appropriate method, including wireless, wired, fiber optic cable, RE or siralar, or any suitable combination thereof. The computer program code to perform operations for aspects of the present exposition can be written in any combination of one or more RRcnnn / pznz / B / Yuu -42 programming languages, including an object-oriented programming language such as Java, Scala, Smalltale, Eiffel, JADE, Emerald, C++, C#, VB.NET, Python, or similar; conventional procedural programming languages ​​such as C, Visual Basic, Fortran 2003, Perl, COBOL 2002, PHP, 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, partly on the user's computer (such as a standalone software package), partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server. In the last scenario, the remote computer may connect to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or a connection.It can be done to an external computer (e.g., via the Internet using an Internet service provider) or in a cloud computing environment or offered as a Software as a Service (SaaS). Furthermore, the listed order of elements or processing sequences, or the use of numbers, letters, or other designations, is not intended to limit the claimed processes and methods to any order except as may be specified in the claims. Although the foregoing discusses through various examples what is currently considered a variety of useful modalities of the exposition, it should be understood that such detail is solely for that purpose and that the appended claims are not limited to the modalities set forth, but, on the contrary, are intended to cover equivalent modifications and arrangements that fall within the spirit and scope of the modalities described. For example, although the implementation of various 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 description of the modalities of the present disclosure, several features are sometimes grouped into a single modality, figure, or description thereof in order to simplify the disclosure and aid in the understanding of one or more of the various inventive modalities. This method of disclosure, however, should not be interpreted as a reflection of the intention that the claimed subject matter requires more features than are expressly mentioned in each claim. RRcnnn / eznz / E / YiAi -43 Well, inventive modalities are found in less than all the characteristics of a single modality described above. In some embodiments, numbers expressing quantities, properties, etc., used to describe and claim certain embodiments of the application should be understood as modified in some cases by the term "close to," "approximately," or "substantially." For example, "close to," "approximately," or "substantially" may indicate a variation of ±20% of the value described, unless otherwise stated. Consequently, in some embodiments, the numerical parameters set forth in the written description and the attached claims are approximations that may vary depending on the desired properties sought to be achieved by a particular embodiment. In some embodiments, the numerical parameters should be interpreted in light of the number of significant digits reported and by applying ordinary rounding techniques.Although the numerical ranges and parameters that establish the broad scope of some application modalities are approximations, the numerical values ​​established in the specific examples are reported as accurately as possible. Each of the patents, patent applications, patent application publications and other materials, such as articles, books, specifications, publications, documents, things and / or the like, referenced herein, are incorporated herein by reference in their entirety for all purposes, except any court records associated therewith, any of which are inconsistent with or conflict with this document, or any of which may have a limiting effect on the broader scope of the claims now or hereafter associated herewith.By way of example, if there is any inconsistency or conflict between the description, definition and / or use of a term not associated with any of the incorporated materials and the one associated with this document, the description, definition and / or use of the term in this document will prevail. Finally, it should be understood that the application methods described in this document are illustrative of the principles of the application methods. Other modifications that may be used may fall within the scope of the application. Thus, by way of example, but not limitation, alternative configurations of the application methods may be used. RRcnnn / cznz / E / YiAi in accordance with the teachings herein. Therefore, the modalities of this application are not limited precisely to what is shown and described.< / del>

Claims

1. An acoustic output apparatus, cpie, comprises: at least one acoustic driver, wherein the at least one acoustic driver generates sounds cpie that have opposite phases, and the sounds with opposite phases are radiated outwards from at least two sound guide holes, respectively; and a housing structure configured to carry at least one acoustic driver and including a user contact surface, wherein when a user uses the acoustic output apparatus, the user contact surface is configured to be in contact with the user's body, and an angle included between the line of connection of the at least two sound guide holes and the user contact surface is in a range of 75° to 90°.

2. The acoustic output apparatus of claim 1, wherein the at least two sound guide holes include a first sound guide hole and a second sound guide hole, and the distance from the first sound guide hole to the user contact surface is less than the distance from the second sound guide hole to the user contact surface.

3. The acoustic output apparatus of claim 2, wherein the distance from the first sound guide hole to the user contact surface is less than or equal to af> mm.

4. The acoustic output apparatus of claim 3, wherein the distance from the first sound guide hole to the surface of contact with the user is less than or equal to 2 mm.

5. The acoustic output apparatus of claim 2, wherein the distance between the first sound guide hole and the second sound guide hole is less than or equal to 2 mm. or The acoustic output apparatus of claim 2, wherein the distance between the first sound guide hole and the second sound guide hole is less than or equal to 0.5 mm.

7. The acoustic output apparatus of claim 1, wherein the at least one acoustic controller includes a diaphragm and a magnetic circuit structure, the side of the diaphragm oriented away from the magnetic circuit structure forms the front side of the at least one acoustic controller, a side of the magnetic circuit structure oriented away from the diaphragm forms the rear side of the at least one acoustic controller, and the diaphragm vibrates to cause the at least one acoustic controller to radiate sounds outwards from the front side and the rear side of the at least one acoustic controller, respectively.

8. The acoustic output apparatus of claim 1, wherein the at least one acoustic controller includes a first acoustic controller and a second acoustic controller, the first acoustic controller including a first diaphragm, the second acoustic controller including a second diaphragm, a sound generated by the vibration of the first diaphragm and a sound generated by the vibration of the second diaphragm having opposite phases, and the sounds generated by the vibration of the first diaphragm and the second diaphragm are radiated outwards from the at least two sound guide holes, respectively.

9. The acoustic output apparatus of claim 1, wherein a damping layer is provided in the two sound guide holes.

10. The acoustic output apparatus of claim 9, wherein the damping layer is a metal filter mesh or a gauze mesh.

11. An acoustic output apparatus, comprising: at least one acoustic controller, wherein the at least one acoustic controller generates sounds having opposite phases, and the sounds having opposite phases are radiated outwards from at least two sound guide holes, respectively; and a housing structure configured to carry the at least one acoustic controller and including a user contact surface, wherein when a user uses the acoustic output apparatus, the user contact surface is configured to be in contact with the user's body, and an included angle between a connecting line of the at least two sound guide holes and the user contact surface is in a range of 0° to 15°.

12. The acoustic output apparatus of claim 11, wherein the two sound guide holes include a first sound guide hole and a second sound guide hole, and the distance from the first sound guide hole or the second sound guide hole to the user contact surface is less than or equal to 5 mm.

13. The acoustic output apparatus of claim 12, wherein the distance from the first sound guide hole or the second sound guide hole to the user contact surface is less than or equal to 2 mm.

14. The acoustic output apparatus of claim 11, wherein the 'distance between the first sound guide hole and the second sound guide hole is less than or equal to 2πτη.

15. The acoustic output apparatus of claim 14, wherein the distance between the first sound guide hole and the second sound guide hole is less than or equal to 0.5 mm.

16. The acoustic output apparatus of claim 11, wherein the at least one acoustic controller includes a diaphragm and a magnetic circuit structure, a side of the diaphragm oriented away from the magnetic circuit structure forming the front side of the at least one acoustic controller, a side of the magnetic circuit structure oriented away from the diaphragm forming the rear side of the at least one acoustic controller, and the diaphragm vibrates to cause the at least one acoustic controller to radiate sounds outwards from the front side and the rear side of the at least one acoustic controller, respectively.

17. The acoustic output apparatus of claim 13, wherein the at least one acoustic controller includes a first acoustic controller and a second acoustic controller, the first acoustic controller including a first 'diaphragm', the second acoustic controller including a second 'diaphragm', a sound generated by the vibration of the first 'diaphragm' and a sound generated by the vibration of the second 'diaphragm' have opposite phases, and the sounds generated by the vibration of the first 'diaphragm' and the second 'diaphragm' are radiated outwards from the at least two sound guide holes, respectively.

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