Sound production device

Abstract

The embodiments of the present description relate to a sound production device, comprising: a sound production portion, which comprises a housing and a diaphragm arranged in the housing, wherein in the housing, a front cavity and a rear cavity are respectively provided on two sides of the diaphragm, with the front cavity being acoustically coupled to a sound output hole provided on the housing and facing the external auditory canal of a user, and the rear cavity being acoustically coupled to a pressure relief hole on the housing; an ear hook, which comprises a first part for being hung between the user's auricle and head, and a second part that extends towards the side of the user's auricle facing away from his / her head and is connected to the sound production portion; one or more microphones, which is / are arranged on the ear hook and configured to collect ambient sound to generate corresponding electrical signals; and a processing circuit, which is configured to amplify the electrical signals generated by the microphones, and send the processed electrical signals to the sound production portion. At least one of the one or more microphones is located on the first part of the ear hook, and the line connecting at least one microphone to the sound output hole goes across the user's auricle.

Description

Sound production device TECHNICAL FIELD

[0001] The present specification relates to the field of acoustics, and in particular, to a sound production device. BACKGROUND

[0002] Sound production devices (e.g., hearing aids) with hearing assistance functions are tools, devices, apparatuses, and instruments that can be used by hearing-impaired people to improve hearing impairment and thus improve the ability to communicate with others. Current types of hearing aids mainly include behind-the-ear hearing aids, in-the-canal hearing aids, and the like. The wearing comfort and output effect of the sound production device (e.g., hearing aid) greatly affect the selection and experience of the user.

[0003] Therefore, it is necessary to provide a sound production device to improve the wearing comfort of the user and the output effect of the sound production device.

[0004] SUMMARY

[0005] Embodiments of the present specification provide a sound production device, comprising: a sound production part, comprising a shell and a diaphragm arranged in the shell, in the shell, two sides of the diaphragm are respectively provided with a front cavity and a back cavity, the front cavity is acoustically coupled with a sound outlet hole arranged on the shell, the sound outlet hole is arranged towards an external ear canal of a user, and the back cavity is acoustically coupled with a pressure relief hole arranged on the shell; an ear hook, comprising a first part and a second part, the first part is hung between an auricle of the user and a head of the user, and the second part extends to a side of the auricle of the user away from the head of the user and is connected to the sound production part, for placing the sound production part near the external ear canal of the user without blocking an ear canal opening of the user; one or more microphones arranged on the ear hook and configured to collect environmental sound to generate corresponding electrical signals; a processing circuit for amplifying and processing the electrical signals generated by the microphones, and sending the processed electrical signals to the sound production part, the sound production part generates sound under the action of the electrical signals; wherein at least one of the one or more microphones is located at the first part of the ear hook, and a line connecting the at least one microphone and the sound outlet hole passes through the auricle of the user. BRIEF DESCRIPTION OF DRAWINGS

[0006] The present specification will be further described in the manner of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, the same numbers represent the same structures, wherein:

[0007] FIG. 1 is an exemplary ear diagram, according to some embodiments of the present specification;

[0008] FIG. 2 is an exemplary wearing diagram of a sound production device, according to some embodiments of the present specification;

[0009] FIG. 3 is another exemplary wearing schematic diagram of the sound production device according to some embodiments of the present specification;

[0010] FIG. 4 is an exemplary wearing schematic diagram of the sound production device according to some embodiments of the present specification;

[0011] FIG. 5 is an exemplary projection schematic diagram of the sound production device in the sagittal plane of a user according to some embodiments of the present specification;

[0012] FIG. 6 is an exemplary structural schematic diagram of the sound production device in an unworn state according to some embodiments of the present specification;

[0013] FIG. 7 is an exemplary sound pressure level sound field distribution schematic diagram of the sound production portion according to some embodiments of the present specification;

[0014] FIG. 8A is a relative position schematic diagram of the pressure relief hole, sound outlet hole and first microphone according to some embodiments of the present specification;

[0015] FIG. 8B is a relative position schematic diagram of the pressure relief hole, sound outlet hole and first microphone from another perspective according to some embodiments of the present specification;

[0016] FIG. 9 is a cross-sectional schematic diagram of the ear hook at the first microphone according to some embodiments of the present specification;

[0017] FIG. 10 is an exemplary internal structure schematic diagram of the sound production portion according to some embodiments of the present specification;

[0018] FIG. 11 is a directivity schematic diagram of the sound production portion according to some embodiments of the present specification;

[0019] FIG. 12 is a sound pressure level sound field distribution schematic diagram of the sound production portion according to some embodiments of the present specification. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present specification, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some examples or embodiments of the present specification, and for those skilled in the art, the present specification can also be applied to other similar scenarios without creative labor on the basis of these drawings. Unless it is obvious from the language environment or otherwise stated, the same reference numbers in the drawings represent the same structures or operations.

[0021] It should be understood that the "system", "device", "unit" and / or "module" used herein is a method for distinguishing different components, elements, parts, sections or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

[0022] As used in the specification and claims, the words "including" and "containing" and variations thereof will be understood to mean that the item or items being described is not necessarily composed of only the recited item or items, but can also comprise additional items that are not mutually exclusive of the recited item or items.

[0023] Flow diagrams are used in the description of embodiments consistent with the present description to illustrate the operations performed by systems according to embodiments of the present description. It will be understood that the operations shown and described above or below are not necessarily performed in the precise order shown. Rather, various steps can be handled in reverse order or simultaneously with each other. Additionally, other operations can be added or removed from the processes described above or below.

[0024] A sound production device with a hearing aid function, such as a hearing aid, mainly includes a microphone for collecting external sound, a processing circuit for processing the signal, a speaker for outputting sound, and the like. The signal collected by the microphone is sent to the speaker after being processed (e.g., amplified) by the processing circuit, and played by the speaker to the user. In some cases, the microphone may collect the sound played by the speaker, and the processing circuit may amplify and send the sound signal to the speaker again for playing, thereby forming an echo and resulting in poor output effect of the hearing aid.

[0025] Current types of hearing aids mainly include a behind-the-ear hearing aid, an in-the-canal hearing aid, and the like, and the behind-the-ear hearing aid includes an in-the-ear hearing aid, an open hearing aid, and the like. Among them, the in-the-canal hearing aid is arranged in the external auditory canal of the user, and the in-the-ear hearing aid blocks the ear canal of the user when worn. Both of them may reduce the wearing comfort of the user when worn for a long time. However, the speaker of the in-the-canal hearing aid and the in-the-ear hearing aid is located in the external auditory canal of the user in the wearing state, and the microphone is located outside the external auditory canal. The sound produced by the speaker is isolated by the external auditory canal of the user and is not easy to be collected by the microphone, and is not easy to produce echo, and the output effect is better. The open hearing aid does not block the ear canal of the user, and the wearing comfort is higher. However, the open hearing aid is easy to form a sound transmission path between the speaker and the microphone, thereby producing a large echo, resulting in the problem of poor output effect.

[0026] To solve the above problems, some embodiments of the present specification provide an open sound production device, which mainly comprises a sound production part, an ear hook, one or more microphones and a processing circuit. The microphone can collect external sound signals and generate corresponding electrical signals, the processing circuit can process and amplify the electrical signals, and the sound production part outputs sound according to the amplified electrical signals. The ear hook comprises a first part hung between the user's pinna and the user's head and a second part extending to the side of the user's pinna away from the user's head and connected to the sound production part. The ear hook can place the sound production part near the user's external auditory canal without blocking the user's ear canal, thereby improving the wearing comfort of the sound production device. Further, at least one of the one or more microphones is located on the first part of the ear hook, and the line connecting the at least one microphone and the sound hole on the sound production part housing passes through the user's pinna. By separating the pinna between the sound hole and the microphone, the sound output by the sound production part is blocked by the pinna, reducing the sound output by the sound production part received by the microphone, reducing the influence of the sound production part on the microphone, reducing the generation of echo, and at the same time the pinna can block the wind, reducing the wind noise received by the microphone, thereby improving the output effect of the sound production device.

[0027] FIG. 1 is an exemplary ear diagram according to some embodiments of the present specification.

[0028] As shown in FIG. 1, the ear 100 can include an external auditory canal 101, a cymba concha 102, a crus of the helix 103, a triangular fossa 104, a contralateral helix 105, a scapha 106, a helix 107, a tragus 108, and an antitragus 109. In some embodiments, the pinna (or auricle) can be a collective term for the outer ear parts of the ear 100 other than the external auditory canal 101. For example, as shown in FIG. 1, the pinna can include the cymba concha 102, the crus of the helix 103, the triangular fossa 104, the contralateral helix 105, the scapha 106, the helix 107, the tragus 108, and the antitragus 109. It should be noted that, for the convenience of description, the upper foot of the contralateral helix, the lower foot of the contralateral helix, and the contralateral helix 105 are collectively referred to as the contralateral helix region in the embodiments of the present disclosure. In some embodiments, the support of the sound production device by one or more parts of the ear 100 can achieve the stability of the sound production device. In some embodiments, the external auditory canal 101, the cymba concha 102, the crus of the helix 103, the triangular fossa 104, and the like have a certain depth and volume in the three-dimensional space, and can be used to achieve the wearing requirement of the sound production device. For example, the sound production device (e.g., an in-ear hearing aid) can be worn in the external auditory canal 101. In some embodiments, the sound production device can be worn by means of other parts of the ear 100 other than the external auditory canal 101. For example, the sound production device can be worn by means of the crus of the helix 103, the triangular fossa 104, the contralateral helix 105, the scapha 106, or the helix 107, or a combination thereof. In some embodiments, in order to improve the comfort and reliability of the sound production device in wearing, the tragus 108 and the like of the user can also be further used. By means of the wearing of the sound production device and the propagation of sound by other parts of the ear 100 other than the external auditory canal 101, the external auditory canal 101 of the user can be “liberated”. In some embodiments, according to the structure of the ear 100, the sound production device can be designed to be adapted to the structure of the ear 100 to achieve the wearing of the sound production part of the sound production device at different positions of the ear 100. For example, when the sound production device is an open hearing aid, the open hearing aid can include an ear hook and a sound production part, the sound production part is connected to the ear hook by a physical manner, and the ear hook can be adapted to the shape of the pinna to place the whole or part of the structure of the sound production part on the upper part of the antitragus (e.g., the positions of one or more parts of the antitragus 109, the crus of the helix 103, the triangular fossa 104, the contralateral helix 105, the scapha 106, the helix 107, and the like). For another example, when the user wears the open hearing aid, the whole or part of the structure of the sound production part can be located in the cavity formed by one or more parts of the ear 100 (e.g., the cymba concha 102, the crus of the helix 103, the triangular fossa 104, and the like).

[0029] Different users can have individual differences, resulting in different sizes of the ear 100, such as different shapes, sizes, etc. For ease of description and understanding, if not specifically stated, the present specification will mainly take an ear model with "standard" shape and size as a reference to further describe the wearing manner of the sound generating device in different embodiments on the ear model. For example, a simulator containing a head and its (left, right) ear 100 made based on ANSI: S3.36, S3.25 and IEC: 60318-7 standards, such as GRAS 45BC KEMAR, HEAD Acoustics, B&K 4128 series or B&K 5128 series, can be taken as a reference for wearing the sound generating device, so as to present the scenario of most users normally wearing the sound generating device. Taking GRAS KEMAR as an example, the simulator of the ear can be any one of GRAS 45AC, GRAS 45BC, GRAS 45CC or GRAS 43AG, etc. Taking HEAD Acoustics as an example, the simulator of the ear can be any one of HMS II.3, HMS II.3LN or HMS II.3LN HEC, etc. It should be noted that the data range measured in the embodiments of the present specification is measured on the basis of GRAS 45BC KEMAR, but it should be understood that there can be differences between different head models and ear models, and the relevant data range can fluctuate by ±10% when using other models. Merely as an example, the reference ear 100 can have the following relevant characteristics: the size of the projection of the pinna on the vertical axis direction in the sagittal plane can be in the range of 49.5mm-74.3mm, and the size of the projection of the pinna on the sagittal axis direction in the sagittal plane can be in the range of 36.6mm-55mm. Therefore, in the present application, descriptions such as "worn by a user", "in a wearing state" and "in a wearing state" can refer to the sound generating device described in the present application being worn on the ear 100 of the aforementioned simulator. Of course, considering that different users have individual differences, the structure, shape, size, thickness, etc. of one or more parts of the ear 100 can be designed differently according to different shapes and sizes of the ear 100, and these different designs can be manifested in that the characteristic parameters of one or more parts (for example, the sound generating part, the ear hook, etc. below) of the sound generating device can have different ranges of values, so as to adapt to different ears 100. In addition, it should be noted that the "non-wearing state" is not limited to only the state that the sound generating device is not worn on the ear 100 of the user, but also includes the state that the sound generating device is not deformed by external force; the "wearing state" is not limited to only the state that the sound generating device is worn on the ear 100 of the user, and the ear hook and the sound generating part being opened to a corresponding distance can also be regarded as a wearing state.

[0030] It should be noted that in the field of medicine, anatomy, etc., three basic planes, i.e., a sagittal plane, a coronal plane and a horizontal plane, and three basic axes, i.e., a sagittal axis, a coronal axis and a vertical axis, can be defined for a human body. The sagittal plane is a plane perpendicular to the ground surface and made along the front-to-back direction of the body, which divides the body into two parts, i.e., a left part and a right part. The coronal plane is a plane perpendicular to the ground surface and made along the left-to-right direction of the body, which divides the body into two parts, i.e., an anterior part and a posterior part. The horizontal plane is a plane parallel to the ground surface and made along the vertical direction of the body, which divides the body into two parts, i.e., a superior part and an inferior part. Correspondingly, the sagittal axis is an axis perpendicular to the coronal plane and along the front-to-back direction of the body, the coronal axis is an axis perpendicular to the sagittal plane and along the left-to-right direction of the body, and the vertical axis is an axis perpendicular to the horizontal plane and along the vertical direction of the body. Further, the front side of the ear is a concept relative to the back side of the ear, the front side of the ear refers to a side of the ear 100 along the sagittal axis and facing the facial region of the human body, and the back side of the ear refers to a side of the ear 100 along the sagittal axis and away from the facial region of the human body. When the ear 100 of the simulator is observed along the direction of the coronal axis of the human body, the front side profile of the ear 100 shown in FIG. 1 can be obtained.

[0031] The above description of the ear 100 is only for the purpose of illustration and is not intended to limit the scope of the present application. Those skilled in the art can make various changes and modifications according to the description of the present application. For example, part of the structure of the sound generating device can cover part or all of the external auditory canal 101. These changes and modifications are still within the scope of the present application.

[0032] FIG. 2 is an exemplary wearing diagram of a sound generating device according to some embodiments of the present specification, and FIG. 3 is another exemplary wearing diagram of a sound generating device according to some embodiments of the present specification. As shown in FIGS. 2 and 3, the sound generating device 10 can include a sound generating portion 11, an ear hook 12, one or more microphones (for example, point A shown in FIG. 3, or points B and C) disposed on the ear hook 12, and a processing circuit (not shown in the figure). In some embodiments, the sound generating device 10 can wear the sound generating portion 11 on the user's body (for example, the head, neck or upper torso of the human body) through the ear hook 12, while the sound generating portion 11 can be close to the user's external auditory canal but not block the ear canal opening, so that the user's ear 100 remains in an open state, improving the wearing comfort of the sound generating device 10. The one or more microphones can collect external environmental sound and generate corresponding electrical signals, and the processing circuit can amplify the electrical signals generated by the microphones, and the sound generating portion 11 generates sound output under the excitation of the amplified electrical signals.

[0033] In some embodiments, the sound emitting portion 11 can include a housing 111, which can be used to be worn on the user's body, and a diaphragm 112 disposed in the housing 111, which can carry the diaphragm 112. In some embodiments, the housing 111 can be a closed housing structure with an inner cavity, and the diaphragm 112 is located in the inner cavity of the housing 111. In some embodiments, the housing 111 can be a housing structure with a shape adapted to the human ear 100, such as a circular ring, an ellipse, a polygon (regular or irregular), a U shape, a V shape, a semicircle, etc., so that the housing 111 can be directly hung on the user's ear 100. In some embodiments, the housing 111 can further include a fixing structure. Exemplarily, the fixing structure can be an ear hook, an elastic band, etc., so that the sound emitting device 10 can be better worn on the user's body to prevent the user from falling during use.

[0034] In some embodiments, when the user wears the sound emitting device 10, the sound emitting portion 11 can be located above, below, in front of (e.g., in front of the tragus) or in the concha (e.g., in the concha cavity) of the user's ear 100.

[0035] In some embodiments, when the diaphragm 112 vibrates, sound can be emitted from the front side and the back side of the diaphragm 112, respectively. The front side of the diaphragm 112 in the housing 111 is provided with a front cavity (not labeled in the figure) for transmitting sound, and the back side of the diaphragm 112 in the housing 111 is provided with a back cavity (not labeled in the figure) for transmitting sound. The housing 111 can also be provided with a sound outlet hole 1111 acoustically coupled to the front cavity and a pressure relief hole 1112 acoustically coupled to the back cavity. The sound from the front side of the diaphragm 112 can be emitted from the sound outlet hole 1111 through the front cavity, and the sound from the back side of the diaphragm 112 can be emitted from the pressure relief hole 1112 through the back cavity. In some embodiments, the diaphragm 112 in the sound emitting portion 11 can output sound with a phase difference (e.g., opposite phase) through the sound outlet hole 1111 and the pressure relief hole 1112. When the diaphragm 112 vibrates, the front side and the back side of the diaphragm 112 can simultaneously generate a set of sound with a phase difference (e.g., opposite phase). After the sound passes through the front cavity and the back cavity, respectively, it will be propagated outward from the positions of the sound outlet hole 1111 acoustically coupled to the front cavity and the pressure relief hole 1112 acoustically coupled to the back cavity. In some embodiments, the sound outlet hole 1111 can be located on the inner side wall (e.g., inner side IS) of the housing 111 of the sound emitting portion 11 facing the user's external auditory canal 101, and the pressure relief hole 1112 can be located on the side (e.g., outer side OS) of the housing 111 of the sound emitting portion 11 away from the user's external auditory canal 101.

[0036] In combination with FIG. 1, FIG. 2 and FIG. 3, 11A, 11B and 11C in FIG. 2 respectively represent schematic diagrams of the sound production part 11 in different positions in the wearing state, and FIG. 3 is a schematic diagram of the sound production part 11 in the position shown in 11C in the wearing state. In some embodiments, when the user wears the sound production device 10, at least part of the sound production part 11 can be located in the area in front of the eardrum of the user's ear 100 or the front outer lateral surface area of the auricle. In the following, the sound production part 11 in different wearing positions (such as the sound production part 11A, the sound production part 11B and the sound production part 11C) will be exemplarily described. It should be noted that the front outer lateral surface of the auricle referred to in the embodiments of the present specification refers to the side of the auricle away from the head along the coronal axis direction, and correspondingly, the rear inner lateral surface of the auricle refers to the side of the auricle towards the head along the coronal axis direction. In some embodiments, the sound production part 11A is located on the side of the user's ear 100 along the sagittal axis direction towards the human facial area, that is, the sound production part 11A is located on the front side of the ear 100 towards the human facial area. Further, the sound production part 11A is internally provided with a diaphragm 112, and at least one sound outlet hole 1111 can be provided on the shell 111 of the sound production part 11A, which can be located on the side wall of the shell 111 of the sound production part 11A towards or close to the user's external auditory canal 101, and the diaphragm 112 can output sound to the user's external auditory canal 101 through the sound outlet hole 1111. In some embodiments, the sound production part 11 can have a long axis direction Y and a short axis direction Z perpendicular to the thickness direction X and orthogonal to each other. Wherein, the long axis direction Y can be defined as the direction with the largest extension size in the shape of the two-dimensional projection plane (for example, the projection of the sound production part 11 on the plane where the outer lateral surface is located, or the projection on the sagittal plane) of the sound production part 11 (for example, when the projection shape is a rectangle or an approximate rectangle, the long axis direction is the length direction of the rectangle or the approximate rectangle), and the short axis direction Z can be defined as the direction perpendicular to the long axis direction Y in the shape of the sound production part 11 projected on the sagittal plane (for example, when the projection shape is a rectangle or an approximate rectangle, the short axis direction is the width direction of the rectangle or the approximate rectangle). The thickness direction X can be defined as the direction perpendicular to the two-dimensional projection plane, for example, consistent with the direction of the coronal axis, both pointing to the left and right of the body. In some embodiments, the thickness direction X can also be defined as the direction of the sound production part 11 close to or away from the ear 100 in the wearing state. In some embodiments, when the sound production part 11 is in an inclined state in the wearing state, the long axis direction Y and the short axis direction Z are still parallel or approximately parallel to the sagittal plane, and the long axis direction Y can have a certain angle with the direction of the sagittal axis, that is, the long axis direction Y is also correspondingly inclined, and the short axis direction Z can have a certain angle with the direction of the vertical axis, that is, the short axis direction Z is also inclined, as shown in the wearing condition of the sound production part 11B in FIG. 2.In some embodiments, the whole or part of the housing 111 of the sound production part 11B can extend into the concha cavity 102, that is, the projection of the housing 111 of the sound production part 11B on the sagittal plane has an overlapping part with the projection of the concha cavity 102 on the sagittal plane. The specific content of the sound production part 11B can be referred to the content elsewhere in the specification, for example, Figure 4 and the corresponding specification content. In some embodiments, the sound production part 11 in the wearing state can also be in a horizontal state or an approximately horizontal state, as shown in the sound production part 11C of Figure 2 and Figure 3, the long axis direction Y can be consistent or approximately consistent with the direction of the sagittal axis, both pointing to the front-back direction of the body, and the short axis direction Z can be consistent or approximately consistent with the direction of the vertical axis, both pointing to the up-down direction of the body. It should be noted that the sound production part 11C in the wearing state in the approximately horizontal state can mean that the angle between the long axis direction Y of the sound production part 11C shown in Figure 2 and the sagittal axis is within a certain range (for example, not greater than 20°). In addition, the wearing position of the sound production part 11 is not limited to the sound production part 11A, the sound production part 11B and the sound production part 11C shown in Figure 2, as long as at least part of the sound production part 11 can be located in the area in front of the eardrum of the user's ear 100 or in the front-lateral area of the pinna. For example, the whole or part of the sound production part 11 can be located in front of the eardrum 109. For another example, the whole or part of the sound production part 11 can be in contact with the upper part of the external auditory canal 101 (for example, the position of one or more parts such as the eardrum 109, the concha crus 103, the triangular fossa 104, the antihelix 105, the scaphoid fossa 106, the helix 107, etc.). For another example, the whole or part of the sound production part 11 can be located in the cavity formed by one or more parts of the ear 100 (for example, the concha cavity 102, the concha crus 103, the triangular fossa 104, etc.).

[0037] In some embodiments, in the wearing state, the ear hook 12 includes a first part 121 and a second part 122 (as shown in Figure 5), the first part 121 is hung between the pinna of the user's ear and the head, and the second part 122 extends to the side of the pinna away from the head and connects the sound production part 11, so that the sound production part 11 is worn near the external auditory canal but does not block the auditory canal opening.

[0038] In some embodiments, the first part 121 of the ear hook 12 includes a containing bin 123. The processing circuit can be arranged in the containing bin 123, and the containing bin 123 can protect the processing circuit. In some embodiments, the containing bin 123 is located at the end of the first part 121 away from the sound production part 11, and the projection profile of the end of the ear hook 12 away from the sound production part 11 is the projection profile of the free end of the containing bin 123 on the sagittal plane of the user. In some embodiments, when the user wears the sound production device 10, the sound production part 11 and the containing bin 123 can be located on the front side and the back side of the pinna respectively.

[0039] To improve the stability of the sound production device 10 in the wearing state, the sound production device 10 can adopt any one or a combination of the following ways. First, at least part of the ear hook 12 is provided as a contoured structure that fits at least one of the rear side of the ear and the head, so as to increase the contact area of the ear hook 12 with the ear 100 and / or the head, thereby increasing the resistance of the sound production device 10 from falling off the ear 100. Second, at least part of the ear hook 12 is provided as an elastic structure, so as to have a certain amount of deformation in the wearing state, so as to increase the normal pressure of the ear hook 12 on the ear 100 and / or the head, thereby increasing the resistance of the sound production device 10 from falling off the ear 100. Third, at least part of the ear hook 12 is provided to abut against the head in the wearing state, so as to form a counterforce that presses the ear 100, so that the sound production part 11 is pressed against the front side of the ear, thereby increasing the resistance of the sound production device 10 from falling off the ear 100. Fourth, the sound production part 11 and the ear hook 12 are provided to clamp the area of the antihelix, the area of the concha cavity 102, etc. from both sides of the ear 100 in the wearing state, thereby increasing the resistance of the sound production device 10 from falling off the ear 100. Fifth, the sound production part 11 or the auxiliary structure connected thereto is provided to at least partially extend into the cavities such as the concha cavity 102, the cymba concha 103, the triangular fossa 104, and the scaphal 106, thereby increasing the resistance of the sound production device 10 from falling off the ear 100.

[0040] Exemplarily, in combination with FIG. 4, in the wearing state, the free end FE of the sound production part 11 can extend into the concha cavity 102. Among them, the sound production part 11 and the ear hook 12 can be provided to jointly clamp the aforementioned ear area from both sides of the ear area corresponding to the concha cavity 102, thereby increasing the resistance of the sound production device 10 from falling off the ear 100, and further improving the stability of the sound production device 10 in the wearing state. For example, the free end FE is pressed in the concha cavity 102 in the thickness direction X; for another example, the free end FE abuts in the concha cavity 102 in the long axis direction Y and the short axis direction Z.

[0041] FIG. 4 is an exemplary wearing schematic diagram of a sound production device according to some embodiments of the present specification, FIG. 5 is an exemplary projection schematic diagram of a sound production device in the sagittal plane of a user according to some embodiments of the present specification, and FIG. 6 is an exemplary structural schematic diagram of a sound production device in an unwearing state according to some embodiments of the present specification. Among them, the A' point, the B' point, the C' point, the D' point, the E' point, the P' point, the Q' point, the M' point, and the H' point in FIG. 5 are the projection points of the A point, the B point, the C point, the D point, the E point, the P point, the Q point, the M point, and the H point in FIG. 4 in the sagittal plane of the user, respectively.

[0042] In some embodiments, referring to FIGS. 4, 5 and 6, the sound generating portion 11 can have an inner side IS facing the ear in the thickness direction X in the wearing state and an outer side OS away from the ear, and a connecting surface connecting the inner side IS and the outer side OS. It should be noted that in the wearing state, the sound generating portion 11 can be provided in a circular, oval, rounded square, rounded rectangular shape, etc. observed in the direction of the coronal axis (i.e. the thickness direction X). Among them, when the sound generating portion 11 is provided in a circular, oval shape, etc., the connecting surface mentioned above can refer to the arc-shaped side of the sound generating portion 11; and when the sound generating portion 11 is provided in a rounded square, rounded rectangular shape, etc., the connecting surface mentioned above can include the lower side LS, the upper side US and the rear side RS mentioned below. Therefore, in order to facilitate description, the present embodiment will be exemplarily described by taking the sound generating portion 11 provided in a rounded rectangular shape as an example. Among them, the length of the sound generating portion 11 in the long axis direction Y can be greater than the width of the sound generating portion 11 in the short axis direction Z. As shown in FIG. 3, the sound generating portion 11 can have an upper side US away from the external auditory canal 101 in the short axis direction Z in the wearing state and a lower side LS facing the external auditory canal 101, and a rear side RS connecting the upper side US and the lower side LS, the rear side RS being located at one end of the long axis direction Y towards the back of the brain in the wearing state and at least partially located in the concha cavity 102. In some embodiments, the rear side RS of the sound generating portion 11 is the free end FE of the sound generating portion 11.

[0043] In some embodiments, the sound outlet hole 1111 can be provided on the inner side IS of the sound generating portion 11, and the pressure relief hole 1112 can be provided on the upper side US of the sound generating portion 11. In some embodiments, the centroid P point of the sound outlet hole 1111 can be used to represent the position of the sound outlet hole 1111, and the centroid Q point of the pressure relief hole 1112 can be used to represent the position of the pressure relief hole 1112, as shown in FIGS. 4-6. In some embodiments, the direction of the line PQ points to the user's ear canal opening to improve the directivity of the sound generating portion 11. In some embodiments, when the number of sound outlet holes 1111 is more than one, the P point can be understood as the centroid of the equivalent hole formed by the plurality of sound outlet holes 1111; when the number of pressure relief holes 1112 is more than one, the Q point can be understood as the centroid of the equivalent hole formed by the plurality of pressure relief holes 1112. In some embodiments, the position of the equivalent hole formed by a plurality of holes can be determined by sequentially connecting the center points of adjacent holes to form a polygon or polyhedron, and the centroid of the polygon or polyhedron is the center point of the equivalent hole, which can be used to represent the position of the equivalent hole.

[0044] In some embodiments, when the diaphragm 112 vibrates, the front and back sides of the diaphragm 112 can respectively serve as a sound wave generation structure, generating sound waves with equal amplitude and opposite phase. In some embodiments, the sound waves with equal amplitude and opposite phase can be respectively radiated outward through the sound hole 1111 and the pressure relief hole 1112, forming a double sound source, which can interfere destructively at a spatial point (for example, the far field), thereby reducing the far field leakage of the sound generating part 11.

[0045] Figure 7 is a schematic diagram of an example sound pressure level sound field distribution of a sound generating part according to some embodiments of the present specification. As shown in Figure 7, in the medium-low frequency range (for example, 50Hz-1kHz), the sound field distribution of the sound generating part 11 exhibits good double sound source directivity. That is, in the medium-low frequency range, the double sound source formed by the sound hole 1111 and the pressure relief hole 1112 of the sound generating part 11 outputs sound waves with opposite phases, and the sound field forms a distribution mode with two lobe structures in space. In the two opposite directions of the double sound source connection line (i.e., the two opposite directions on the connection line PQ, the 0° direction and the 180° direction in Figure 7), the sound pressure level is large, which is a high leakage area. In the direction perpendicular to the double sound source connection line (i.e., the vertical direction of the connection line PQ, the 90° direction and the 270° direction in Figure 7), the sound pressure level is small, which is a low leakage area.

[0046] In some embodiments, at least one of the one or more microphones is located on the first part 121 of the ear hook 12, for example, at the position of point A or point C shown in Figure 4. And the line connecting the at least one microphone and the sound hole 1111 passes through the user's auricle, for example, the line AP and the line CP shown in Figure 4 pass through the user's auricle. By separating the auricle between the sound hole 1111 and the microphone, the sound output by the sound generating part 11 is blocked by the auricle, reducing the sound received by the microphone, reducing the influence of the sound generating part 11 on the microphone, reducing the generation of echo, and at the same time the auricle can block the wind, reducing the wind noise received by the microphone, thereby improving the output effect of the sound generating device 10.

[0047] In some embodiments, the one or more microphones can include even only a first microphone (not shown in the figure), which can collect external environmental sound and generate a corresponding electrical signal. Based on the electrical signal processed by the processing circuit, the diaphragm 112 vibrates to generate sound.

[0048] In some embodiments, in order to reduce the influence of the sound output by the sound generating part 11 on the first microphone, to reduce the generation of echo and improve the output effect of the sound generating device 10, the sound output by the sound generating part 11 received by the first microphone can be reduced as much as possible. For example, the first microphone can be located at the position of point A.

[0049] In some embodiments, in addition to the method of setting a gap (auricle) between the first microphone and the sound production part 11, the sound outputted from the sound hole 1111 and the pressure relief hole 1112 of the sound production part 11 can be mutually cancelled at the first microphone, so as to reduce the sound outputted from the sound production part 11 collected by the first microphone, thereby reducing the generation of echo and improving the output effect of the sound production device 10. That is, the first microphone should be placed in the low sound leakage area of the sound production part 11, for example, near the 90° direction and the 270° direction in FIG. 7, so that the sound pressure level difference of the sound outputted from the sound hole 1111 and the pressure relief hole 1112 of the sound production part 11 at the first microphone is small (for example, less than 3 dB). In order to achieve this purpose, the distance from the first microphone to the centroid P point of the sound hole 1111 (i.e. the length of the line AP) and the distance from the first microphone to the centroid Q point of the pressure relief hole 1112 (i.e. the length of the line AQ) should be close or equal, so that the sound paths of the sound hole 1111 and the pressure relief hole 1112 to the first microphone are close, and the sound outputted from the sound hole 1111 and the pressure relief hole 1112 can be cancelled at the first microphone. In some embodiments, the ratio of the distance from the first microphone to the centroid P point of the sound hole 1111 (i.e. the length of the line AP) to the distance from the first microphone to the centroid Q point of the pressure relief hole 1112 (i.e. the length of the line AQ) ranges from 0.8 to 1.2. In some embodiments, in order to further reduce the generation of echo, the difference between the distance from the first microphone to the centroid P point of the sound hole 1111 (i.e. the length of the line AP) and the distance from the first microphone to the centroid Q point of the pressure relief hole 1112 (i.e. the length of the line AQ) can be less than 5 mm.

[0050] Please continue to refer to FIG. 7, the sound field of the sound production part 11 forms a distribution mode of two lobe structures in space, on two opposite directions of the double sound source connecting line (i.e. two opposite directions on the line PQ), the sound pressure level is large, which is a high sound leakage area; and in the direction perpendicular to the double sound source connecting line (i.e. the vertical direction of the line PQ), the sound pressure level is small, which is a low sound leakage area. In order to reduce the sound outputted from the sound production part 11 collected by the first microphone, the first microphone can be arranged in the low sound leakage area, that is, the first microphone can be arranged near the 90° direction or the 270° direction of the directivity of the sound field of the sound production part 11. In some embodiments, considering the structure and position of the ear hook 12 and the sound production part 11, when the sound hole 1111 is located at the 0° direction, the pressure relief hole 1112 is located at the 180° direction, and the first part 121 is located on the side of the 270° direction of the line connecting the pressure relief hole 1112 and the sound hole 1111, the first microphone can be arranged near the 270° direction.

[0051] FIG. 8A is a schematic diagram of the relative positions of the pressure relief hole, the sound outlet hole, and the first microphone, according to some embodiments of the present disclosure; FIG. 8B is a schematic diagram of the relative positions of the pressure relief hole, the sound outlet hole, and the first microphone from another perspective, according to some embodiments of the present disclosure. Please refer to FIGS. 5, 6, 8A, and 8B. The line PQ connecting the centroid P of the sound outlet hole 1111 and the centroid Q of the pressure relief hole 1112 has a midpoint M, and the line PQ has a vertical bisector plane S1 passing through the midpoint M. FIG. 8A is a perspective view from the free end FE of the sound production portion 11 toward the connection end of the sound production portion 11 and the ear hook 12, and FIG. 8B shows the relative positions of the first microphone (point A) and the vertical bisector plane S1.

[0052] In some embodiments, the angle between the line connecting the midpoint M and the first microphone (i.e., point A) and the vertical bisector plane S1 is -60°-60°, so that the first microphone is located in the low-leakage sound area of the sound production portion 11, reducing the sound of the sound production portion 11 collected by the first microphone, reducing the generation of echo, and improving the output effect of the sound production device 10. In some embodiments, in order to further reduce the echo, the angle between the line connecting the midpoint M and the first microphone (i.e., point A) and the vertical bisector plane S1 can be -30°-30°. In some embodiments, in order to further reduce the echo, the angle between the line connecting the midpoint M and the first microphone (i.e., point A) and the vertical bisector plane S1 can be -10°-10°.

[0053] In some embodiments, the positive or negative value of the angle between the line connecting the midpoint M and the first microphone (i.e., point A) and the vertical bisector plane S1 can indicate which side of the vertical bisector plane S1 the first microphone (i.e., point A) is located on. For example, please refer to FIG. 8B. When the first microphone is located on the side of the vertical bisector plane S1 close to the pressure relief hole 1112 (i.e., point Q), the first microphone can correspond to point A1, the projection of point A1 on the vertical bisector plane S1 is point A1', and the value of the angle (i.e., ∠A1MA1') between the line connecting the midpoint M and the first microphone (i.e., point A1) and the vertical bisector plane S1 can be positive. When the first microphone is located on the side of the vertical bisector plane S1 close to the sound outlet hole 1111 (i.e., point P), the first microphone can correspond to point A2, the projection of point A2 on the vertical bisector plane S1 is point A2', and the value of the angle (i.e., ∠A2MA2') between the line connecting the midpoint M and the first microphone (i.e., point A2) and the vertical bisector plane S1 can be negative. Of course, in other embodiments, the value of the angle between the line connecting the midpoint M and the first microphone and the vertical bisector plane S1 can be negative when the first microphone is located on the side of the vertical bisector plane S1 close to the pressure relief hole 1112, and the value of the angle between the line connecting the midpoint M and the first microphone and the vertical bisector plane S1 can be positive when the first microphone is located on the side of the vertical bisector plane S1 close to the sound outlet hole 1111.

[0054] In some embodiments, referring to FIG. 4, FIG. 5, and FIG. 6, in the wearing state, the free end FE of the sound generating part 11 can extend into the concha cavity and abut against the concha cavity, the side of the ear hook 12 close to the user's head has a first contact point D that contacts the user's head, and the side of the ear hook 12 close to the sound generating part 11 has a second contact point E that contacts the user's auricle, and the second contact point E can cooperate with the free end FE to achieve clamping of the sound generating device 10.

[0055] In some embodiments, the absolute value of the difference between the distance from the first microphone (i.e., point A) to the first contact point D (i.e., the length of line AD) and the distance from the first microphone (i.e., point A) to the second contact point E (i.e., the length of line AE) is less than 1 mm. That is, the absolute value of the difference between the lengths of line AD and line AE is less than 1 mm. Through the above arrangement, the distances from the first microphone to the first contact point D and the second contact point E can be similar, that is, the first microphone can be located near the perpendicular bisector of the line connecting the first contact point D and the second contact point E, and at this time the first microphone is simultaneously far away from the first contact point D and the second contact point E, so that the first microphone is far away from the user's head skin or auricle to reduce the echo generated by the user's head skin or auricle interfering with the first microphone. In some embodiments, in order to further enable the first microphone to simultaneously have a large distance from the first contact point D and the second contact point E, the first microphone can be arranged close to the perpendicular bisector of the line connecting the first contact point D and the second contact point E, and the absolute value of the difference between the lengths of line AD and line AE can be less than 0.8 mm. In some embodiments, in order to further enable the first microphone to be arranged close to the perpendicular bisector of the line connecting the first contact point D and the second contact point E, the absolute value of the difference between the lengths of line AD and line AE can be less than 0.5 mm.

[0056] FIG. 9 is a cross-sectional view of the ear hook at the first microphone according to some embodiments of the present specification. Referring to FIG. 9, D" is the projection point of the first contact point D on the cross-section, E" is the projection point of the second contact point E on the cross-section, and straight line L1 is the intersection of the perpendicular bisector of the line connecting the first contact point D and the second contact point E and the cross-section. In some embodiments, straight line L1 can be the projection of the perpendicular bisector of the line connecting D" and E" on the cross-section. As shown in FIG. 9, point A can be arranged close to straight line L1, and correspondingly, the first microphone is arranged close to the perpendicular bisector of the line connecting the first contact point D and the second contact point E.

[0057] Please refer to FIG. 4 and FIG. 5, in some embodiments, the ear hook 12 has an outermost end H point in the long axis direction Y of the sound production part 11. In some embodiments, the outer contour of the ear hook 12 has a tangent plane at the outermost end H point, which is perpendicular to the long axis direction Y, and the projection of the tangent plane on the user's sagittal axis is a straight line L2. That is, the straight line L2 is tangent to the ear hook 12 at the H point.

[0058] In some embodiments, the outermost end H point can also be determined by other methods. For example, a reference point (such as the centroid of the sound production part 11) can be taken as the origin, the long axis direction Y can be taken as the horizontal axis, and the other direction (such as the short axis direction Z) can be taken as the vertical axis to establish a coordinate system, and the simulation curve of the outer contour of the ear hook 12 can be introduced, and then the point with the minimum horizontal coordinate on the simulation curve can correspond to the outermost point H point.

[0059] In some embodiments, the distance (i.e. the length of the line AH) between the first microphone (i.e. point A) and the outermost end (i.e. point H) can be not greater than 2mm, so that the first microphone can be away from the inner contour of the ear hook 12 close to the user's pinna in the wearing state, thereby making the first microphone away from the user's pinna and reducing the echo caused by the user's ear to the first microphone, and improving the output effect of the sound production device 10. In some embodiments, in order to further make the first microphone away from the user's ear and reduce the interference of the user's ear to the first microphone, the distance (i.e. the length of the line AH) between the first microphone and the outermost end can be not greater than 1.5mm. In some embodiments, in order to further make the first microphone away from the user's head skin and reduce the echo, the distance (i.e. the length of the line AH) between the first microphone and the outermost end can be not greater than 1mm.

[0060] If the cross-sectional area of the ear hook 12 near the point A is very small, the distance between the point A and the back of the pinna or the head skin will be too small due to the abutment between the ear hook 12 and the back of the pinna or the head skin in the wearing state, which will affect the sound pickup effect of the first microphone. In order to avoid the above problems, the cross-sectional area of the ear hook 12 at the position of the first microphone should meet certain conditions. Please refer to FIG. 9, the first microphone is arranged at the first position (i.e. point A) of the ear hook 12, and the cross-sectional area of the ear hook 12 at the first position is 75mm 2 ~ 250mm 2 , so that the ear hook 12 has sufficient structural strength while the first microphone can be away from the user's ear, reducing the echo and improving the output effect of the sound production device 10. In some embodiments, in order to further ensure that the ear hook 12 has sufficient structural strength, the cross-sectional area of the ear hook 12 at the first position is 100mm 2 ~ 200mm 2 . In some embodiments, in order to make the first microphone further away from the user's ear and head skin, the cross-sectional area of the ear hook 12 at the first position can be 125mm 2 ~ 175mm2 .

[0061] In some embodiments, the cross-sectional shape of the ear hook 12 can be circular, i.e. the ear hook 12 as a whole can be cylindrical, so that the ear hook 12 is round and has no edges, improving the wearing comfort of the ear hook 12. In some embodiments, in order to keep the first microphone away from the skin of the user's ear and head and reduce echo, the radius of the cross-section of the ear hook 12 at the first position can be 5mm-7mm.

[0062] In some embodiments, the first microphone (i.e. point A) can be arranged in the accommodation cavity 123, which can protect the first microphone. In addition, compared with the size of other positions on the ear hook 12, the size of the accommodation cavity 123 is larger, which can keep the first microphone away from the skin of the user's ear and head, reduce echo, and improve the output effect of the sound production device 10.

[0063] In some embodiments, referring to FIG. 6, the ear hook 12 includes an ear hook plane S2. In some embodiments, the ear hook plane S2 is a plane formed by the three outermost convex points on the ear hook 12, i.e. the plane that supports the ear hook 12 when the ear hook 12 is freely placed (i.e. not subject to external forces). For example, when the ear hook 12 is freely placed on a horizontal plane, the horizontal plane supports the ear hook 12, and the horizontal plane 12 can be regarded as the ear hook plane S2. In other embodiments, the ear hook plane S2 can also refer to a plane formed by a bisector that bisects or approximately bisects the ear hook 12 along the length extension direction thereof. In the wearing state, the ear hook 12 can be approximately regarded as being in contact with the head, and the ear hook plane S2 can be approximately equivalent to the contact surface of the ear hook 12 with the user's head. The distance from the first microphone to the ear hook plane S2 can reflect the distance from the first microphone to the user's head. If the distance from the first microphone to the ear hook plane S2 is too small, the skin of the user's head can interfere with the first microphone, produce echo, and affect the output effect of the sound production device 10. In some embodiments, the distance from the first microphone (i.e. point A) to the ear hook plane S2 is greater than 10mm.

[0064] In some embodiments, in order to further reduce echo, the distance from the first microphone to the ear hook plane S2 can be greater than 12mm. In some embodiments, in order to further reduce echo, the distance from the first microphone to the ear hook plane S2 can be greater than 15mm.

[0065] In some embodiments, the one or more microphones can include a microphone array formed by at least two microphones, for example, including a second microphone (not shown in the figures) and a third microphone (not shown in the figures), the second microphone and the third microphone can respectively collect ambient sound and respectively generate corresponding electrical signals. The processing circuit can identify and further process (for example, amplify) the sound in a specific direction range (for example, the direction indicated by the line connecting the two microphones) according to the electrical signals collected by the microphone array. In the embodiments of the present application, B point can be used to represent the position of the second microphone, and C point can be used to represent the position of the third microphone, as shown in Figures 3, 4 and 5.

[0066] Please refer to Figures 3, 4 and 5, in some embodiments, the second microphone (i.e. B point) and the third microphone (i.e. C point) are both arranged on the ear hook 12, the second microphone (i.e. B point) is located in front of the third microphone (i.e. C point), and the line (i.e. line CP) connecting the third microphone (i.e. C point) and the sound outlet hole 1111 (i.e. P point) passes through the user's auricle, so that the sound output by the sound generating part 11 is blocked by the auricle, reducing the sound output by the sound generating part 11 received by the third microphone, reducing the generation of echo, at the same time, the auricle can block the wind, reducing the wind noise received by the third microphone, thereby improving the output effect of the sound generating device 10. Wherein, the front side refers to the direction from the back of the user's head to the user's face.

[0067] In order to reduce the sound output by the sound generating part 11 collected by the second microphone and the third microphone, and to reduce the echo, the sound generating part 11 can be designed to have a directional sound field, that is, to have a larger output in the direction from the sound generating part 11 to the user's ear canal, and to have a smaller sound leakage in other directions. For example, the sound field of the sound generating part 11 can be designed to have a heart-shaped directivity, and the directivity direction is the direction from the sound generating part 11 to the user's ear canal (for example, the direction from the centroid Q point of the pressure relief hole 1112 to the centroid P point of the sound outlet hole 1111).

[0068] Fig. 10 is a schematic diagram of an exemplary internal structure of the sound generating portion according to some embodiments of the present disclosure. Referring to Fig. 10, in some embodiments, the sound generating portion 12 can include a first diaphragm 112-1 and a second diaphragm 112-2, the first diaphragm 112-1 outputs sound through a sound hole 1111, and the second diaphragm 112-2 outputs sound through a pressure relief hole 1112. In some embodiments, the processing circuit can process the electrical signals generated by the second microphone and the third microphone respectively, and the first diaphragm 112-1 and the second diaphragm 112-2 can generate sound respectively according to the processed electrical signals. For example, the processed electrical signal of the second microphone can be used as the excitation of the first diaphragm 112-1, so that the first diaphragm 112-1 generates sound corresponding to the electrical signal output by the second microphone; and the processed electrical signal of the third microphone can be used as the excitation of the second diaphragm 112-2, so that the second diaphragm 112-2 generates sound corresponding to the electrical signal output by the third microphone.

[0069] Fig. 11 is a schematic diagram of the directivity of the sound generating portion according to some embodiments of the present disclosure; and Fig. 12 is a schematic diagram of the sound pressure level sound field distribution of the sound generating portion according to some embodiments of the present disclosure.

[0070] Referring to Figs. 11 and 12, in some embodiments, the sound generating portion 11 shown in Fig. 11 is in a wearing state, wherein point P represents the sound hole 1111 through which the first diaphragm 112-1 outputs sound, and point Q represents the pressure relief hole 1112 through which the second diaphragm 112-2 outputs sound. In some embodiments, the sound hole 1111 and the pressure relief hole 1112 radiate sound in a directionally manner in the far field of the sound generating device 10, and the absolute value of the difference between the sound pressure levels of the sound generating device 10 at two far field positions in a specific direction and the opposite direction thereof within a target frequency range is not less than 6 dB. The line connecting the sound hole 1111 and the pressure relief hole 1112 (i.e., the line QP) defines the specific direction.

[0071] In some embodiments, the directivity of the far-field radiation of the sound production device 10 refers to that the output sound direction of the sound production device 10 is within a specified direction range, i.e., the far-field radiation of the sound production device 10 within the specified direction range is significantly greater than that outside the specified direction range. In some embodiments, in the wearing state, the direction K1 (i.e., the direction from the Q point to the P point) and the directions (e.g., the direction K2, the direction K3) near the direction K1, which are from the pressure relief hole 1112 (i.e., the Q point) to the sound outlet hole 1111 (i.e., the P point), are the directions pointing to the ear canal entrance of the user's external ear canal. That is, in the wearing state, the sound outlet hole 1111 is closer to the ear canal entrance of the user's ear. The direction K1' and the directions (e.g., the direction K2', the direction K3') near the direction K1', which are from the sound outlet hole 1111 (i.e., the P point) to the pressure relief hole 1112 (i.e., the Q point), are the directions in which the sound production part 11 faces away from the ear canal entrance of the user. In some embodiments, in the wearing state and / or the non-wearing state, the direction K1 (i.e., the direction from the Q point to the P point) and the directions near the direction K1, which are from the pressure relief hole 1112 (i.e., the Q point) to the sound outlet hole 1111 (i.e., the P point), can constitute the above-mentioned specified direction range. The far-field radiation of the sound production device 10 in the direction K1 and the directions near the direction K1 is significantly greater than that in other direction ranges (e.g., the direction range perpendicular to the direction K1 and the directions near the direction K1, the direction range opposite to the direction K1 and the directions near the direction K1, etc.). In some embodiments, the directivity of the sound production device 10 can be manifested as that the absolute value of the difference between the sound pressure levels at two corresponding far-field positions in a specific direction and the opposite direction of the sound production device 10 is not less than 6 dB. In the wearing state, the specific direction can be the direction in which the sound production device 10 (the sound production part 11) faces away from the ear canal entrance of the user, and the opposite direction can be the direction in which the sound production device 10 (the sound production part 11) points to the external ear canal of the user. In some embodiments, the specific direction can be the direction K1' and the directions near the direction K1', which are from the sound outlet hole 1111 (i.e., the P point) to the pressure relief hole 1112 (i.e., the Q point); the opposite direction of the specific direction can be the direction K1 (i.e., the direction from the Q point to the P point) and the directions near the direction K1, which are from the pressure relief hole 1112 (i.e., the Q point) to the sound outlet hole 1111 (i.e., the P point). In some embodiments, the directions near the direction K1' can be understood as the directions having an included angle of less than 60° with the direction K1'. It should be noted that, for the purpose of conveniently understanding the directivity, only the sound outlet hole 1111 and the pressure relief hole 1112 are exemplarily described herein. When the sound production part 11 of the sound production device 10 has more different hole parts, the P point can be understood as the centroid of the equivalent hole part formed by the plurality of sound outlet holes 1111, and the Q point can be understood as the centroid of the equivalent hole part formed by the plurality of pressure relief holes 1112.

[0072] In some embodiments, the first diaphragm 112-1 and the second diaphragm 112-2 are not synchronized in vibration, and the first sound generated by the first diaphragm 112-1 and the second sound generated by the second diaphragm 112-2 have a phase difference, so that the first sound and the second sound can be superimposed and enhanced on the side of the sound generating part 11 facing the user's external auditory canal, and superimposed and cancelled on the side of the sound generating part 11 away from the user's external auditory canal, so that the sound field of the sound generating part 11 (sound generating device 10) has a cardioid directivity.

[0073] In some embodiments, the far-field radiation of the sound generating device 10 has a cardioid directivity, which can be manifested as: in a specified direction range, the absolute value of the sound pressure level difference of the far-field radiation sound of the sound generating device 10 in at least one pair of opposite directions is not less than 6dB, so that the user's ear canal can receive a larger volume, and the user can obtain a clear listening effect. Among them, the at least one pair of opposite directions can respectively fall within the above-mentioned specified direction range and its opposite direction range. In some embodiments, the at least one pair of opposite directions can include the above-mentioned specific direction and its opposite direction. That is, the above-mentioned specific direction and its opposite direction can be respectively included in the above-mentioned specified direction range and its opposite direction range. In some embodiments, the above-mentioned at least one pair of opposite directions includes a pair of opposite directions corresponding to the line connecting the sound outlet hole 1111 (i.e. P point) and the pressure relief hole 1112 (i.e. Q point). The cardioid directivity of the sound generating device 10 can be manifested as the sound field intensity of a pair of opposite or nearly opposite directions in the above-mentioned specified direction range and its opposite direction range has a large difference. Exemplarily, the above-mentioned pair of opposite or nearly opposite directions can refer to one direction near the direction K1' pointing from the sound outlet hole 1111 (i.e. P point) to the pressure relief hole 1112 (i.e. Q point), and the other direction near the direction K1 pointing from the pressure relief hole 1112 (i.e. Q point) to the sound outlet hole 1111 (i.e. P point). For example, the direction K1' can be opposite or nearly opposite to the direction K1, the direction K2, and the direction K3.

[0074] In some embodiments, in order to improve the listening effect of the user, the sound generating device 10 can have a cardioid directivity in the frequency range sensitive to the human ear, such as near 3kHz or near 3.5kHz. The target frequency range can be 1kHz-4kHz.

[0075] Please refer to FIG. 11 and FIG. 12, in the cardioid directivity of the sound field of the sound generating part 11, the maximum point of the sound field is near the 0° direction, and the minimum point of the sound field is near the 180° direction. In some embodiments, the line connecting the centroid of the sound outlet hole 1111 (i.e. P point) and the centroid of the pressure relief hole 1112 (i.e. Q point) (i.e. line PQ) is located on the straight line of the 0° direction and the 180° direction.

[0076] To reduce the sound outputted by the sound generating part 11 collected by the second microphone and the third microphone, and to reduce the generation of echo, the second microphone and the third microphone can be arranged in a low leakage area, i.e. the second microphone and the third microphone can be arranged near the 180° direction of the cardioid directivity of the sound field of the sound generating part 11. In some embodiments, considering the structure and position of the ear hook 12 and the sound generating part 11, the second microphone (i.e. point B) and the third microphone (i.e. point C) are arranged on the ear hook 12 on the side of the sound generating part 11 pointing from the sound hole 1111 (i.e. point P) to the pressure relief hole 1112 (i.e. point Q), i.e. the second microphone (i.e. point B) and the third microphone (i.e. point C) are arranged on the ear hook 12 on the upper side of the sound generating part 11. In some embodiments, the included angle (i.e. ∠BMQ) between the line connecting the second microphone (i.e. point B) and the midpoint M and the line (i.e. line PQ) connecting the centroid of the sound hole 1111 (i.e. point P) and the centroid of the pressure relief hole 1112 (i.e. point Q) is 0°-30°. In some embodiments, the included angle (i.e. ∠CMQ) between the line connecting the third microphone (i.e. point C) and the midpoint M and the line (i.e. line PQ) connecting the centroid of the sound hole 1111 (i.e. point P) and the centroid of the pressure relief hole 1112 (i.e. point Q) is -30°-0°.

[0077] In some embodiments, to further reduce echo, the included angle (i.e. ∠BMQ) between the line connecting the second microphone and the midpoint M and the line connecting the centroid of the sound hole 1111 and the centroid of the pressure relief hole 1112 can be 0°-20°. In some embodiments, to further reduce echo, the included angle (i.e. ∠BMQ) between the line connecting the second microphone and the midpoint M and the line connecting the centroid of the sound hole 1111 and the centroid of the pressure relief hole 1112 can be 0°-10°.

[0078] In some embodiments, to further reduce echo, the included angle (i.e. ∠CMQ) between the line connecting the third microphone and the midpoint M and the line connecting the centroid of the sound hole 1111 and the centroid of the pressure relief hole 1112 can be -20°-0°. In some embodiments, to further reduce echo, the included angle (i.e. ∠CMQ) between the line connecting the third microphone and the midpoint M and the line connecting the centroid of the sound hole 1111 and the centroid of the pressure relief hole 1112 can be -10°-0°.

[0079] In some embodiments, the positive or negative of the values of the two angles can represent which side of the line connecting the center of the sound outlet hole 1111 and the center of the pressure relief hole 1112 (i.e., the line PQ) the corresponding microphone is located. Specifically, please refer to FIG. 4, when the second microphone (i.e., point B) is located on the side of the line PQ pointing to the user's face (e.g., the side away from the free end FE), the value of the included angle between the line connecting the second microphone and the midpoint M and the line connecting the center of the sound outlet hole 1111 and the center of the pressure relief hole 1112 can be positive; when the third microphone (i.e., point C) is located on the side of the line PQ pointing to the back of the user's head (e.g., the side towards the free end FE), the value of the included angle between the line connecting the third microphone and the midpoint M and the line connecting the center of the sound outlet hole 1111 and the center of the pressure relief hole 1112 can be negative. Of course, in other embodiments, the second microphone can be located on the side of the line PQ pointing to the back of the user's head when the value of the included angle between the line connecting the second microphone and the midpoint M and the line connecting the center of the sound outlet hole 1111 and the center of the pressure relief hole 1112 is negative; the third microphone can be located on the side of the line PQ pointing to the user's face when the value of the included angle between the line connecting the third microphone and the midpoint M and the line connecting the center of the sound outlet hole 1111 and the center of the pressure relief hole 1112 is positive.

[0080] It should be noted that the second microphone (i.e., point B), the third microphone (i.e., point C), the center P of the sound outlet hole 1111, and the center Q of the pressure relief hole 1112 can be coplanar or not coplanar, and the included angle ∠BMQ corresponding to the second microphone and the included angle ∠CMQ corresponding to the third microphone can be measured in different planes, respectively.

[0081] In addition, please refer to FIG. 4 and FIG. 5, by arranging the second microphone and the third microphone on both sides of the line connecting the center of the sound outlet hole 1111 and the center of the pressure relief hole 1112, the line connecting the second microphone and the third microphone can be directed to the front of the user, so as to better collect the sound emitted by the user's conversation object.

[0082] Referring to FIG. 5, the projection of the ear hook 12 on the sagittal plane of the user includes an outer contour, i.e., the curve J1J2, and an inner contour, i.e., the curve J3J4. Among them, the J1 point is the intersection of the outer contour of the ear hook 12 and the sound generating part 11, the J3 point is the intersection of the inner contour of the ear hook 12 and the sound generating part 11, the J2 point is the end point of the outer contour of the ear hook 12 at one end of the accommodation bin 123 close to the free end of the ear hook 12, and the J4 point is the end point of the inner contour of the ear hook 12 at one end of the accommodation bin 123 close to the free end of the ear hook 12. In some embodiments, in the short axis direction Z of the projection of the sound generating part 11 on the sagittal plane, the outer contour curve J1J2 can have an extreme point N point. In some embodiments, a reference coordinate system can be established with a reference point (for example, the centroid of the sound generating part 11) as the origin, the long axis direction Y as the horizontal axis, and the short axis direction Z as the vertical axis, and the outer contour curve J1J2 of the ear hook 12 is analyzed in the reference coordinate system to determine the extreme point N point of the outer contour curve J1J2 of the ear hook 12 in the short axis direction Z.

[0083] In some embodiments, the projection B' point of the second microphone on the sagittal plane of the user and the projection C' point of the third microphone on the sagittal plane of the user can be located on the two sides of the extreme point N point of the outer contour of the ear hook 12, respectively, so that the line connecting the second microphone and the third microphone can point to the front of the user, so as to better collect the sound emitted by the conversation object in front of the user.

[0084] In some embodiments, the second microphone (i.e., the B point) can be located on the front side of the user's pinna. That is, the second microphone is located on the side of the user's pinna facing the user's face, so that the second microphone is not blocked by the user's pinna (as shown in FIG. 4), so as to improve the pickup effect of the second microphone on the sound of the external environment. In addition, the second microphone located on the front side of the user's pinna can be close to the user's face, so as to better collect the sound emitted by the conversation object in front of the user.

[0085] In some embodiments, in the wearing state, the projection B' point of the second microphone on the sagittal plane of the user is located outside the projection of the user's pinna on the sagittal plane, so that the second microphone is not blocked by the user's pinna, so as to improve the pickup effect of the second microphone on the sound of the external environment.

[0086] Since the second microphone is located on the front side of the user's pinna, the second microphone (i.e., the B point) and the centroid P point of the sound hole 1111 are not connected through the pinna, the sound hole 1111 and the second microphone are not blocked by the pinna, and the sound output by the sound hole 1111 can be directly transmitted to the second microphone. In order to minimize the sound output by the sound generating part 11 received by the second microphone, the second microphone should be arranged in the low sound leakage area of the sound field of the sound generating part 11.

[0087] Since the line connecting the third microphone and the centroid P of the sound outlet hole 1111 passes through the auricle, the sound output by the sound production unit 11 is blocked by the auricle, and the third microphone receives less sound output by the sound production unit 11. The third microphone can be arranged in the low-leakage area of the sound field of the sound production unit 11.

[0088] In some embodiments, the angle between the line connecting the second microphone and the midpoint M and the line connecting the centroid of the sound outlet hole 1111 and the centroid of the pressure relief hole 1112 (i.e., ∠BMQ) can be greater than the angle between the line connecting the third microphone and the midpoint M and the line connecting the centroid of the sound outlet hole 1111 and the centroid of the pressure relief hole 1112 (i.e., ∠CMQ), as shown in FIG. 4, so that the second microphone is arranged in the low-leakage area of the sound field of the sound production unit 11, and the third microphone can be arranged in the area with greater sound leakage of the sound field of the sound production unit 11.

[0089] In some embodiments, referring to FIG. 4, in the wearing state, the angle α between the line connecting the second microphone and the third microphone (i.e., the line BC) and the user's sagittal axis can be -30°-30°, so that the line connecting the second microphone and the third microphone points to the front of the user, so as to better collect the sound emitted by the dialogue object located in front of the user. In some embodiments, in order to improve the collection effect of the second microphone and the third microphone on the sound emitted by the user's dialogue object, the angle α between the line connecting the second microphone and the third microphone (i.e., the line BC) and the user's sagittal axis can be -10°-10°. In some embodiments, in order to further improve the collection effect of the second microphone and the third microphone on the sound output by the sound source located in front of the user, the angle α between the line connecting the second microphone and the third microphone (i.e., the line BC) and the user's sagittal axis can be -5°-5°.

[0090] In some embodiments, the positive or negative value of the angle α between the line connecting the second microphone and the third microphone (i.e., the line BC) and the user's sagittal axis can represent the orientation of the line CB connecting the second microphone and the third microphone. For example, when the value of the angle α is positive, the direction from the point C to the point B is the upper front direction, i.e., the direction pointing to the top of the user's head and the front of the user; when the value of the angle α is negative, the direction from the point C to the point B is the lower front direction, i.e., the direction pointing to the user's mouth and the front of the user.

[0091] In some embodiments, please refer to FIG. 2 and FIG. 4, the long axis direction Y of the sound emitting part 11 and the sagittal axis of the user can be parallel or inclined or perpendicular. The angle between the line connecting the second microphone and the third microphone (i.e. the line CB) and the long axis direction Y of the sound emitting part 11 can also reflect the directivity of the line connecting the second microphone and the third microphone (i.e. the line CB). In some embodiments, the angle β between the line connecting the second microphone and the third microphone (i.e. the line CB) and the long axis direction Y of the sound emitting part 11 is -30°-30°, so that the line connecting the second microphone and the third microphone points to the front of the user, so as to better collect the sound emitted by the conversation object in front of the user. It should be noted that when the sound emitting part 11 is in different position states (corresponding to different inclination angles γ of the long axis direction Y of the sound emitting part 11 relative to the sagittal axis), the range of the angle β between the line connecting the second microphone and the third microphone (i.e. the line CB) and the long axis direction Y of the sound emitting part 11 can be different. For example, when the sound emitting part 11 is in the position shown by the sound emitting part 11C in FIG. 2, the long axis direction Y is parallel to the sagittal axis, and at this time the angle β between the line connecting the second microphone and the third microphone (i.e. the line CB) and the long axis direction Y of the sound emitting part 11 can be -30°-30°; when the sound emitting part 11 is in the position shown by the sound emitting part 11A in FIG. 2, the long axis direction Y is perpendicular to the sagittal axis, and at this time the angle β between the line connecting the second microphone and the third microphone (i.e. the line CB) and the long axis direction Y of the sound emitting part 11 can be 60°-120°. Specifically, the angle β between the line connecting the second microphone and the third microphone (i.e. the line CB) and the long axis direction Y of the sound emitting part 11 is determined by the inclination angle γ of the long axis direction Y relative to the sagittal axis, when γ is positive, it means that the long axis direction Y is inclined upward relative to the sagittal axis, and at this time the value of β is the angle α minus the angle γ, wherein the angle α is -30°-30°; when γ is negative, it means that the long axis direction Y is inclined downward relative to the sagittal axis, and at this time the value of β is the angle α plus the angle γ, wherein the angle α is -30°-30°.

[0092] In some embodiments, the distance between the second microphone and the third microphone (i.e. the length of the line BC) can be 5mm-20mm, so that there is no auricle isolation between the second microphone and the third microphone, at the same time, the sound emitted by the conversation object in front of the user reaches the second microphone and the third microphone with a time difference, so that the sound collected by the second microphone and the sound collected by the third microphone have a large phase difference and a small amplitude difference, so as to facilitate differential processing and improve the collection effect of the sound emitted by the conversation object in front of the user.

[0093] If the distance between the second microphone and the third microphone is too small, the time difference between the sound signals received by the second microphone and the third microphone is too small, the phase difference between the sounds received by the second microphone and the third microphone is small, the differential processing effect is poor, and the collection effect is not ideal. If the distance between the second microphone and the third microphone is too large, the second microphone and the third microphone are isolated by the pinna, so that there is a large phase difference and a large amplitude difference between the sound collected by the second microphone and the sound collected by the third microphone, the differential processing is difficult, the effect is poor, and the collection effect is poor.

[0094] In some embodiments, in order to further reduce the amplitude difference between the sound signals collected by the second microphone and the third microphone, the distance between the second microphone and the third microphone (i.e. the length of the line BC) can be 10mm-15mm. In some embodiments, in order to further increase the phase difference between the sound signals collected by the second microphone and the third microphone, the distance between the second microphone and the third microphone (i.e. the length of the line BC) can be 12mm-13mm.

[0095] In some embodiments, referring to FIG. 5, compared with the inner contour of the ear hook 12 (i.e. the curve J3J4), the projection B' point of the second microphone on the sagittal plane and the projection C' point of the third microphone on the sagittal plane are both close to the outer contour (i.e. the curve J1J2). That is, on the ear hook 12, the second microphone and the third microphone are both arranged on the side of the ear hook 12 away from the pinna of the user, so that the second microphone and the third microphone can be away from the skin of the user's head, reduce the interference of the user's skin, reduce the echo, and improve the output effect of the sound generating device 10.

[0096] The above has described the basic concept, and it is obvious that the above detailed disclosure is only an example for the person skilled in the art, and does not constitute a limitation on the present application. Although it is not explicitly stated here, the person skilled in the art can make various modifications, improvements and corrections to the present application. Such modifications, improvements and corrections are suggested in the present application, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the present application.

[0097] Meanwhile, specific words are used in the present application to describe the embodiments of the present application. As "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "one alternative embodiment" mentioned in different places in the specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be properly combined.

[0098] For simplicity and to facilitate understanding of one or more embodiments of the application, a description of an embodiment of the application is sometimes divided into multiple parts, each part being presented in a single claim, drawing, or description of an embodiment. Such division into parts is not to be understood as requiring that the claimed application be limited to embodiments that include each feature presented in each part.

[0099] Some embodiments use numerical values to describe components, quantities of attributes. It should be understood that such numerical values used in the description of embodiments are, in some examples, modified by the adjectives "about," "approximately," or "substantially." Unless otherwise stated, "about," "approximately," or "substantially" indicate that the described numerical value allows for a variation of ±20%. Accordingly, numerical values used in the specification and claims of some embodiments are approximations. Variation in these values is a result of reasonable measurement precision and variation in the manufacture and measurement of the respective components. In some embodiments, numerical values should be considered to be defined with the specified degree of accuracy and with the understanding that the numerical values are to be rounded to the ordinary place value as appropriate to the individual circumstances. Although the numerical ranges and parameters setting forth the broad scope of some embodiments of the application are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. The numerical values set forth in the specific examples are provided to be as precise as reasonably possible. However, some variations may occur depending on the standard variation and measurement of these values will depend on each individual embodiment.

[0100] Each patent, patent application, patent publication, and other material, such as articles, books, specifications, publications, documents, and the like, referenced herein are hereby incorporated by reference in their entirety for the teachings relevant to the sentence and / or paragraph in which the reference is made. Discrepancies between applications, if any, are intended to be resolved in favor of the claims in the later applications in the event of inconsistencies between this application and later application files. Note that if there is a discrepancy between the definitions, descriptions, and / or terminology used in this application and that used in the incorporated by reference reference, the definitions, descriptions, and / or terminology used in this application shall control.

[0101] Finally, it should be understood that the embodiments described herein are merely exemplary of the application. Other variations of the embodiments described herein can also be possible. Accordingly, alternative configurations of the embodiments described herein are considered to be within the scope of the present application. Accordingly, the embodiments of the present application are not to be considered as limited to the examples described herein.

Claims

1. A sound production device, comprising: a sound production unit comprising a housing and a diaphragm disposed in the housing, two sides of the diaphragm being provided with a front cavity and a back cavity respectively in the housing, the front cavity being acoustically coupled with a sound outlet hole provided on the housing, the sound outlet hole being disposed towards an external ear canal of a user, the back cavity being acoustically coupled with a pressure relief hole provided on the housing; an ear hook comprising a first portion and a second portion, the first portion being hung between an auricle of the user and a head of the user, the second portion extending to a side of the auricle of the user away from the head of the user and connecting the sound production unit, for placing the sound production unit in a position near the external ear canal of the user but not blocking an ear canal opening of the user; one or more microphones disposed on the ear hook and configured to collect ambient sound to generate corresponding electrical signals; a processing circuit configured to amplify the electrical signals generated by the microphones and send the processed electrical signals to the sound production unit, the sound production unit generating sound under the action of the electrical signals; wherein at least one of the one or more microphones is located on the first portion of the ear hook, and a line connecting the at least one microphone and the sound outlet hole passes through the auricle of the user.

2. The sound production device of claim 1, wherein, The one or more microphones comprise a first microphone, a ratio of a distance from the first microphone to a centroid of the sound outlet hole to a distance from the first microphone to a centroid of the pressure relief hole ranges from 0.8 to 1.

2.

3. The generating device of claim 1, wherein, The one or more microphones comprise a first microphone, a line connecting a centroid of the sound outlet hole and a centroid of the pressure relief hole has a midpoint and a vertical bisector plane defined through the midpoint, an included angle between a line connecting the midpoint and the first microphone and the vertical bisector plane ranges from -60° to 60°.

4. The sound production device of claim 1, wherein, The one or more microphones comprise a first microphone, the first portion comprises a first contact point in contact with the head of the user and a second contact point in contact with the auricle of the user, an absolute value of a difference between a distance from the first microphone to the first contact point and a distance from the first microphone to the second contact point is less than 1 mm.

5. The sound production device of claim 1, wherein, The one or more microphones comprise a first microphone, the ear hook has an outermost end in a long axis direction of the sound production unit, the outermost end being a tangent point of an outer tangent plane of an outer contour of the ear hook perpendicular to the long axis direction of the sound production unit, a distance from the first microphone to the outermost end is not greater than 2 mm.

6. The sound production device of claim 1, wherein, The one or more microphones include a first microphone disposed at a first position of the earhook, the earhook having a cross-sectional area of 75mm 2 ~ 250mm 2 at the first position.

7. The sound production device of claim 1, wherein, The one or more microphones comprise a first microphone, the first portion of the ear hook comprises a receiving cavity, the processing circuit and the first microphone are both disposed in the receiving cavity.

8. The sound production device of claim 1, wherein, The one or more microphones comprise a first microphone, a distance from the first microphone to an ear hook plane of the ear hook is greater than 10 mm.

9. The sound production device of claim 1, wherein, The one or more microphones comprise a second microphone and a third microphone, the second microphone and the third microphone are both disposed on the ear hook, the second microphone is located in front of the third microphone, and a line connecting the third microphone and the sound outlet hole passes through the auricle of the user.

10. The sound production device of claim 9, wherein, The projection of the ear hook on the sagittal plane of the user includes an outer contour, the outer contour has an extreme point in the direction of the short axis of the projection of the sound production part on the sagittal plane, and the projections of the second microphone and the third microphone on the sagittal plane are located on the two sides of the extreme point, respectively.

11. The sound production device of claim 9, wherein, The second microphone is located in front of the pinna of the user.

12. The sound production device of claim 9, wherein, In the wearing state, the projection of the second microphone on the sagittal plane of the user is located outside the projection of the pinna of the user on the sagittal plane of the user.

13. The sound production device of claim 9, wherein, In the wearing state, the angle between the line connecting the second microphone and the third microphone and the sagittal axis of the user is -10°-10°.

14. The sound production device of claim 9, wherein, The angle between the line connecting the second microphone and the third microphone and the direction of the long axis of the sound production part is -30°-30°.

15. The sound production device of claim 9, wherein, The distance between the second microphone and the third microphone is 5mm-20mm.

16. The sound production device of claim 9, wherein, The projection of the ear hook on the sagittal plane of the user includes an outer contour and an inner contour, and compared with the inner contour, the projections of the second microphone and the third microphone on the sagittal plane are arranged close to the outer contour.

17. The sound production device of claim 9, wherein, The sound hole and the pressure relief hole present directivity to the sound radiated by the sound production device to the far field, and the absolute value of the difference between the sound pressure levels of the sound production device at two far field positions in a specific direction and the opposite direction of the specific direction in a target frequency range is not less than 6dB, and the line connecting the sound hole and the pressure relief hole defines the specific direction.

18. The sound production device of claim 17, wherein, The line connecting the centroid of the sound hole and the centroid of the pressure relief hole has a midpoint, the angle between the line connecting the second microphone and the midpoint and the line connecting the centroid of the sound hole and the centroid of the pressure relief hole is 0°-30°.

19. The sound production device of claim 17, wherein, The line connecting the centroid of the sound hole and the centroid of the pressure relief hole has a midpoint, the angle between the line connecting the third microphone and the midpoint and the line connecting the centroid of the sound hole and the centroid of the pressure relief hole is -30°-0°.

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