earphones

Abstract

An embodiment of the present specification provides an earphone including a sound generating unit, an ear hook, and a microphone assembly, the ear hook being configured to mount the sound generating unit in a position near the ear canal so as not to block the ear canal opening, such that at least a portion of the sound generating unit is inserted into the cavity of the concha, the microphone assembly including at least a first microphone and a second microphone, the first microphone or the second microphone being provided in the sound generating unit or the ear hook, and the sound generating unit or the ear hook being provided with a first microphone, A first sound collection hole and a second sound collection hole corresponding to a first microphone and a second microphone are formed, an extension of a line connecting a projection of the first sound collection hole onto the user's sagittal plane and a projection of the second sound collection hole onto the sagittal plane has an intersection with a projection of the antihelix onto the sagittal plane, a distance between the projection of the first sound collection hole onto the sagittal plane and the projection of the second sound collection hole onto the sagittal plane is a first distance, a distance between the projection of the second sound collection hole onto the sagittal plane and the intersection is a second distance, and a ratio of the first distance to the second distance is 1.8 to 4.4.

Description

[Technical Field]

[0001] This application relates to the field of acoustics, and in particular to earphones.

[0002] This application claims priority to a Chinese patent application with application number 202211336918.4 filed on October 28, 2022, a Chinese patent application with application number 202223239628.6 filed on December 1, 2022, and a PCT application with application number PCT / CN2022 / 144339 filed on December 30, 2022, the entire contents of which are incorporated herein by reference. [Background technology]

[0003] With the development of audio output technology, audio devices (e.g., earphones) are widely applied in people's daily lives, and by using them together with electronic devices such as mobile phones and computers, users can enjoy an auditory feast. Summary of the Invention [Problem to be solved by the invention]

[0004] Typically, earphones are equipped with a microphone to pick up the user's voice. The microphone's sound pickup effect depends on the placement method on the earphone. Ensuring the sound output effect of the earphone and improving the microphone's sound pickup effect are issues that need to be resolved. [Means for solving the problem]

[0005] An earphone according to one embodiment of the present specification includes a sound generating unit, an ear hook configured to be worn in a position near the ear canal so as not to block the ear canal opening, so that at least a part of the sound generating unit is inserted into the cavity of the concha, and at least a first microphone and a second microphone, the first microphone or the second microphone being provided in the sound generating unit or the ear hook, and first microphones corresponding to the first microphone and the second microphone being provided in the sound generating unit or the ear hook, a microphone assembly in which a sound collection hole and a second sound collection hole are formed, wherein an extension of a line connecting a projection of the first sound collection hole onto the user's sagittal plane and a projection of the second sound collection hole onto the sagittal plane has an intersection with a projection of the antihelix onto the sagittal plane, a distance between the projection of the first sound collection hole onto the sagittal plane and a projection of the second sound collection hole onto the sagittal plane is a first distance, a distance between the projection of the second sound collection hole onto the sagittal plane and the intersection is a second distance, and a ratio of the first distance to the second distance is 1.8 to 4.4.

[0006] An earphone according to one embodiment of the present specification includes a sound generating unit, an ear hook configured to wear the sound generating unit at a position near the ear canal without blocking the ear canal opening so that at least a part of the sound generating unit covers the antihelix region, and at least a first microphone and a second microphone, the first microphone or the second microphone is provided in the sound generating unit or the ear hook, and a first sound collecting unit corresponding to the first microphone and the second microphone is provided in the sound generating unit or the ear hook, a microphone assembly in which a first sound collection hole and a second sound collection hole are formed, wherein an extension of a line connecting a projection of the first sound collection hole onto the sagittal plane of a user and a projection of the second sound collection hole onto the sagittal plane has an intersection point with a projection of the inner contour of the pinna onto the sagittal plane, a distance between the projection of the first sound collection hole onto the sagittal plane and the projection of the second sound collection hole onto the sagittal plane is a first distance, a distance between the projection of the second sound collection hole onto the sagittal plane and the intersection point is a second distance, and a ratio of the first distance to the second distance is 1.8 to 4.4.

[0007] The present application will be further illustrated by exemplary embodiments, which are not limiting and will be described in detail with reference to the drawings, in which like reference numerals indicate like structures. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of an exemplary ear in accordance with some embodiments of the present disclosure. [Figure 2] 1 is an exemplary schematic diagram of an earphone according to some embodiments of the present disclosure; FIG. [Figure 3] 1 is a schematic view showing how an earphone according to some embodiments of the present specification is worn when a sound generating unit of the earphone is inserted into the cavity of the concha. [Figure 4] FIG. 1 is a schematic diagram of an acoustic model of a similar cavity structure according to some embodiments herein. [Figure 5] FIG. 1 is an exemplary schematic diagram of an earphone according to some embodiments of the present disclosure. [Figure 6] 1 is an exemplary schematic diagram of an earphone according to some embodiments of the present disclosure; FIG. [Figure 7] 10A and 10B are schematic diagrams illustrating exemplary wearing of earphones according to some other embodiments of the present disclosure. [Figure 8] 1 is a schematic diagram of a coordinate system established based on the major and minor axis directions of an audio-producing unit, according to some embodiments herein. FIG. [Figure 9] 10A-10C are schematic diagrams of sound collection curves when the sound collection holes are located at different positions, according to some embodiments herein. [Figure 10] 10A-10C are schematic diagrams of sound collection curves when the sound collection holes are located at different positions, according to some other embodiments of the present disclosure. [Figure 11] 10A-10C are schematic diagrams of sound collection curves when the sound collection holes are located at different positions, according to some other embodiments of the present disclosure. [Figure 12] 10A-10C are schematic diagrams of sound collection curves when the sound collection holes are located at different positions, according to some other embodiments of the present disclosure. [Figure 13]10A-10C are schematic diagrams of sound collection curves when the sound collection holes are located at different positions, according to some other embodiments of the present disclosure. [Figure 14] 10A-10C are schematic diagrams of sound collection curves when the sound collection holes are located at different positions, according to some other embodiments of the present disclosure. [Figure 15A] FIG. 10 is an exemplary schematic diagram of an earphone according to some other embodiments of the present specification. [Figure 15B] FIG. 10 is an exemplary schematic diagram of an earphone according to some other embodiments of the present specification. [Figure 16A] FIG. 10 is a schematic diagram of an example coordinate system established based on an audio generation unit, according to some other embodiments herein. [Figure 16B] FIG. 10 is a schematic diagram of an example coordinate system established based on an audio generation unit, according to some other embodiments herein. [Figure 17] 1 is a schematic diagram of an exemplary positional relationship between a first sound collection hole, a second sound collection hole, and a user's mouth, according to some embodiments herein. FIG. [Figure 18] 10A and 10B are schematic diagrams illustrating exemplary wearing of earphones according to some other embodiments of the present disclosure. [Figure 19] 10A and 10B are schematic diagrams illustrating exemplary wearing of earphones according to some other embodiments of the present disclosure. [Figure 20] 10A and 10B are schematic diagrams illustrating exemplary wearing of earphones according to some other embodiments of the present disclosure. [Figure 21A] 10A and 10B are schematic diagrams illustrating exemplary wearing of earphones according to some other embodiments of the present disclosure. [Figure 21B] 10 is a schematic diagram of an included angle between a line connecting a first sound collection hole and a second sound collection hole and an outer surface of a sound generating unit according to some embodiments of the present disclosure; FIG. [Figure 22] FIG. 10 is an exemplary schematic diagram of an earphone according to some other embodiments of the present specification. [Figure 23] 10 is a schematic cross-sectional view illustrating an exemplary configuration of a sound generating section of an earphone according to some other embodiments of the present specification. FIG. [Figure 24]10A and 10B are schematic diagrams illustrating exemplary wearing of earphones according to some other embodiments of the present disclosure. [Figure 25A] FIG. 10 is a schematic diagram of a corresponding frequency response curve when the distance between the second projection point O and the intersection point C is 8 mm, according to some embodiments herein. [Figure 25B] FIG. 10 is a schematic diagram of a corresponding frequency response curve when the distance between the second projection point O and the intersection point C is 6 mm, according to some embodiments herein. [Figure 25C] FIG. 10 is a schematic diagram of a corresponding frequency response curve when the distance between the second projection point O and the intersection point C is 4 mm, according to some embodiments herein. [Figure 25D] FIG. 10 is a schematic diagram of a corresponding frequency response curve when the distance between the second projection point O and the intersection point C is 2 mm, according to some embodiments herein. [Figure 26] 10A and 10B are schematic diagrams illustrating exemplary wearing of earphones according to some other embodiments of the present disclosure. [Figure 27] 10A and 10B are schematic diagrams illustrating exemplary wearing of earphones according to some other embodiments of the present disclosure. [Figure 28A] 10A and 10B are schematic diagrams illustrating exemplary wearing of earphones according to some other embodiments of the present disclosure. [Figure 28B] 10 is a schematic diagram of an included angle between a line connecting a first sound collection hole and a second sound collection hole and an outer surface of a sound generating unit according to some embodiments of the present disclosure; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] In order to more clearly explain the technical means of the embodiments of the present application, the drawings necessary for the description of the embodiments will be briefly described below. Obviously, the drawings described below are only some examples or embodiments of the present application, and those skilled in the art can apply the present application to other similar scenes based on these drawings without any creative effort. Unless otherwise clear from the language environment or otherwise described, the same numbers in the drawings indicate the same structures or operations.

[0010] FIG. 1 is a schematic diagram of an exemplary ear according to some embodiments of the present disclosure. As shown in FIG. 1 , the ear 100 may include an external auditory canal 101, a cavity of the concha 102, a concha navicularis 103, a triangular fossa 104, an antihelix 105, a scapha 106, a helix 107, an earlobe 108, a crus of the helix 109, an outer contour 1013, and an inner contour 1014. For ease of explanation, the superior crus of the antihelix 1011, the inferior crus of the antihelix 1012, and the antihelix 105 are collectively referred to as the antihelical region in some embodiments. In some embodiments, the stability of the acoustic device can be achieved by supporting the acoustic device in one or more regions of the ear 100. In some embodiments, regions such as the external auditory canal 101, the cavity of the concha 102, the concha navicularis 103, and the triangular fossa 104 have certain depths and volumes in three-dimensional space, which can meet the needs of the acoustic device. For example, an acoustic device (e.g., an in-ear earphone) may be placed in the ear canal 101. In some embodiments, the acoustic device can be placed in a location other than the ear canal 101 of the ear 100. For example, the acoustic device can be placed in the concha scapha 103, the triangular fossa 104, the antihelix 105, the scaphoid fossa 106, the helix 107, or a combination thereof. In some embodiments, to improve comfort and reliability of the acoustic device, the acoustic device can be placed in a location such as the user's earlobe 108. By placing the acoustic device and transmitting sound in a location other than the ear canal 101 of the ear 100, the user's ear canal 101 can be "opened." When a user is wearing the acoustic device (earphone), the acoustic device does not block the user's ear canal 101, and the user can receive not only sound from the acoustic device but also sound from the environment (e.g., horns, bicycle bells, voices of people around them, traffic control, etc.), thereby reducing the likelihood of traffic accidents. In some embodiments, depending on the structure of the ear 100, the acoustic device may be designed to conform to the ear 100, allowing the sound generating portion of the acoustic device to be worn at different positions on the ear.For example, if the acoustic device is an earphone, the earphone may include a suspension structure (e.g., an ear hook) and an audio generating unit, and the audio generating unit and the suspension structure may be physically connected, and the suspension structure may conform to the shape of the pinna of the ear so that the entire or a portion of the audio generating unit is located in front of the crus helix 109 (e.g., area J surrounded by the dotted line in FIG. 1). Also, for example, when a user wears the earphone, the entire or a portion of the audio generating unit may contact the upper part of the ear canal 101 (e.g., a position where one or more parts such as the crus helix 109, the navicularis concha 103, the triangular fossa 104, the antihelix 105, the scapha 106, and the helix 107 are located). Also, for example, when a user is wearing earphones, the entire or partial structure of the sound generating unit may be located within a cavity formed by one or more parts of the ear (e.g., the concha scapula 102, the concha navicularis 103, the triangular fossa 104, etc.) (e.g., the area M1 surrounded by dotted lines in Figure 1, which includes at least the concha navicularis 103 and the triangular fossa 104, and the area M2 including at least the concha navicularis 102).

[0011] Because there may be individual differences among different users, ears have different shapes, sizes, and other dimensional differences. For ease of explanation and understanding, unless otherwise specified, this specification primarily uses an ear model having a "standard" shape and dimensions as a reference, and further describes the fitting method of an acoustic device to the ear model in different embodiments. For example, a simulator including a head and its (left and right) ears manufactured in accordance with ANSI:S3.36, S3.25, and IEC:60318-7 standards, such as GRAS KEMAR, HEAD Acoustics, B&K 4128 series, or B&K 5128 series, can be used as a reference for fitting an acoustic device, thereby representing the scene in which most users normally wear an acoustic device. Taking GRAS KEMAR as an example, the ear simulator may be any of GRAS 45AC, GRAS 45BC, GRAS 45CC, or GRAS 43AG. Taking HEAD Acoustics as an example, the ear simulator may be any of the HMS II.3, HMS II.3 LN, HMS II.3LN HEC, etc. In the examples herein, the measured data range is based on GRAS 45BC KEMAR. However, it should be understood that there may be differences between different head and ear models, and that for other models, the relevant data range may vary by ±10%. By way of example only, the reference ear may be characterized by a vertical axis dimension of the projection of the pinna onto the sagittal plane ranging from 55 to 65 mm, and a sagittal axis dimension of the projection of the pinna onto the sagittal plane ranging from 45 to 55 mm. The projection of the pinna onto the sagittal plane refers to the projection of the edge of the pinna onto the sagittal plane. The edge of the pinna includes at least the outer contour of the helix, the contour of the earlobe, the contour of the tragus, the intertragal notch, the antitragus, and the posterior auricular groove. Therefore, the descriptions "worn by a user," "in a worn state," and "in a worn state" in this application may also mean that the acoustic device described in this application is worn on the ear of the simulator.Naturally, taking into account the individual differences among different users, the structure, shape, size, thickness, etc. of one or more parts of the ear 100 can be differentiated to suit ears of different shapes and dimensions, and these differentiated designs can be expressed to suit different ears by having different ranges of numerical values ​​for the characteristic parameters of one or more parts of the acoustic device (e.g., the sound generating unit, ear hook, etc. described below).

[0012] In fields such as medicine and anatomy, three basic cutting planes of the human body, the sagittal plane, the coronal plane, and the horizontal plane, and three basic axes, the sagittal axis, the coronal axis, and the vertical axis, can be defined. The sagittal plane is a cutting plane perpendicular to the ground along the front-to-back direction of the body, dividing the human body into two parts, left and right. The coronal plane is a cutting plane perpendicular to the ground along the left-to-right direction of the body, dividing the human body into two parts, left and right. The horizontal plane is a cutting plane parallel to the ground along the up-down direction of the body, dividing the human body into two parts, top and bottom. Accordingly, the sagittal axis is an axis perpendicular to the coronal plane along the front-to-back direction of the body, the coronal axis is an axis perpendicular to the sagittal plane along the left-to-right direction of the body, and the vertical axis is an axis perpendicular to the horizontal plane along the up-down direction of the body. Furthermore, the anterior side of the ear as referred to in this application is the side of the ear facing the human face along the sagittal axis. When the ear of the simulator is viewed from the direction of the coronal axis of the human body, a schematic diagram of the anterior contour of the ear is obtained as shown in Figure 1.

[0013] The above description of the ear 100 is for illustrative purposes only and is not intended to limit the scope of the present application. Those skilled in the art can make various changes and modifications based on the description of the present application. For example, some structures of the acoustic device may shield part or all of the ear canal 101. These changes and modifications still fall within the scope of protection of the present application.

[0014] FIG. 2 is an exemplary schematic diagram of an earphone according to some embodiments of the present disclosure. As shown in FIG. 2, the earphone 10 may include an audio-generating unit 11 and a suspension structure 12. In some embodiments, the earphone 10 may be attached to a user's body (e.g., the head, neck, or upper torso of a human body) by the suspension structure 12, with the audio-generating unit 11 attached to the user's body. In some embodiments, the suspension structure 12 may be an earhook, with the audio-generating unit 11 connected to one end of the earhook, and the earhook configured to fit the user's ear. For example, the earhook may have an arc-shaped structure. In some embodiments, the suspension structure 12 may be a clamping structure that fits the user's auricle so as to be clamped to the user's auricle. In some embodiments, the suspension structure 12 may include, but is not limited to, an earhook, an elastic band, or the like, which can better fit the earphone 10 to the user and prevent it from falling off during use.

[0015] In some embodiments, the sound generating unit 11 may be worn on the user's body, and a speaker may be provided within the sound generating unit 11 to generate sound and input it to the user's ear 100. In some embodiments, the earphone 10 may be combined with a product such as glasses, headphones, a head-mounted display, or an AR / VR helmet, and in this case, the sound generating unit 11 may be worn near the user's ear 100 in a hanging or clamping manner. In some embodiments, the sound generating unit 11 may be ring-shaped, elliptical, polygonal (regular or irregular), U-shaped, V-shaped, semicircular, or the like so that it can be directly hung on the user's ear 100.

[0016] As shown in FIGS. 1 and 2 , in some embodiments, when a user wears the earphone 10, at least a portion of the sound generating unit 11 may be located in the anterior region J of the user's ear 100 on the tragus side or in the anterior-lateral surface regions M1 and M2 of the pinna shown in FIG. 1 . Different wearing positions (11A, 11B, and 11C) of the sound generating unit 11 are exemplarily described below. Note that the anterior-lateral surface of the pinna referred to in the embodiments herein is the side facing away from the head along the coronal axis of the pinna, and correspondingly, the posteromedial surface of the pinna is the side facing the human head along the coronal axis of the pinna. In some embodiments, the sound generating unit 11A is located on the side of the user's ear 100 facing the human face region along the sagittal axis, i.e., the sound generating unit 11A is located in the anterior-lateral surface J of the human face region of the ear 100. Furthermore, a speaker may be provided in the housing of the sound generating unit 11A, and the housing of the sound generating unit 11A may be provided with at least one sound output hole (not shown in FIG. 2 ), and the sound output hole may be located on a side wall of the housing of the sound generating unit facing or close to the user's ear canal 101, and the speaker can output sound to the user's ear canal 101 through the sound output hole. In some embodiments, the speaker may include a diaphragm, and a cavity in the housing of the sound generating unit 11A is divided into at least a front cavity and a rear cavity by the diaphragm, and the sound output hole is acoustically coupled to the front cavity, and vibration of the diaphragm vibrates the air in the front cavity to generate air-conducted sound, and the air-conducted sound generated in the front cavity is transmitted to the outside through the sound output hole. In some embodiments, the housing of the sound generating unit 11 may further include one or more decompression holes, which may be located on a side wall of the housing adjacent to or opposite to the side wall where the sound emission hole is located, and the decompression holes are acoustically coupled to the rear cavity, so that vibration of the diaphragm vibrates the air in the rear cavity to generate air-conducted sound, and the air-conducted sound generated in the rear cavity is transmitted to the outside through the decompression holes.For example, in some embodiments, the speaker in the sound generating unit 11A can output sounds having a phase difference (e.g., opposite phases) through a sound output hole and a decompression hole, and the sound output hole may be located on a side wall of the housing of the sound generating unit 11A facing the user's ear canal 101, and the decompression hole may be located on a side of the housing of the sound generating unit 11A facing away from the user's ear canal 101. In this case, the housing acts as a baffle and increases the difference in acoustic distance from the sound output hole and the decompression hole to the ear canal 101, thereby increasing the intensity of the sound in the ear canal 101 and reducing the volume of sound leakage in the far field. In some embodiments, the sound generating unit 11 may have a major axis direction X and a minor axis direction Y that are perpendicular to the thickness direction Z and orthogonal to each other. The major axis direction X may be defined as the direction in which the extension dimension is greatest in the shape of a two-dimensional projection surface of the sound generating unit 11 (for example, a projection of the sound generating unit 11 onto a plane on which its outer surface is located, or a projection onto a sagittal plane) (for example, if the projection shape is rectangular or approximately rectangular, the major axis direction is the length direction of the rectangle or approximately rectangle), and the minor axis direction Y may be defined as the direction perpendicular to the major axis direction X in the projection shape of the sound generating unit 11 onto the sagittal plane (for example, if the projection shape is rectangular or approximately rectangular, the minor axis direction is the width direction of the rectangle or approximately rectangle). The thickness direction Z may be defined as the direction perpendicular to the two-dimensional projection surface, and for example, coincides with the direction of the coronal axis, both of which face the left-right direction of the body. In some embodiments, when the sound-generating unit 11 is inclined while worn, the major axis direction X and the minor axis direction Y remain parallel or approximately parallel to the sagittal plane. The major axis direction X may form a certain angle with the sagittal axis, i.e., the major axis direction X is also inclined accordingly. The minor axis direction Y may form a certain angle with the vertical axis, i.e., the minor axis direction Y is also inclined, resulting in a wearing state of the sound-generating unit 11B as shown in FIG. 2 . In some embodiments, the entire or partial structure of the sound-generating unit 11B may be inserted into the concha cavity, i.e., the projection of the sound-generating unit 11B onto the sagittal plane and the projection of the concha cavity onto the sagittal plane overlap. For specific details of the sound-generating unit 11B, please refer to other parts of this specification, such as FIG. 3 and the corresponding specification.In some embodiments, when worn, the sound generating unit 11 may be in a horizontal or nearly horizontal state. As shown in FIG. 2 , the long axis direction X may coincide with or nearly coincide with the sagittal axis, both of which point in the front-to-back direction of the body, and the short axis direction Y may coincide with or nearly coincide with the vertical axis, both of which point in the up-and-down direction of the body. Note that when worn, the sound generating unit 11C being in a nearly horizontal state may mean that the included angle between the long axis direction X of the sound generating unit 11C shown in FIG. 2 and the sagittal axis is within a specific range (e.g., 20° or less). Note that the wearing position of the sound generating unit 11 is not limited to the sound generating units 11A, 11B, and 11C shown in FIG. 2 , but may be any position that satisfies the region J, region M1, or region M2 shown in FIG. 1 . For example, the entire or partial structure of the sound generating unit 11 may be located in region J surrounded by a dotted line in FIG. 1 . Also, for example, the entire or partial structure of the sound generating unit may contact a position where one or more parts of the external auditory canal 100 are located, such as the crus helicalis 109, the concha navicularis 103, the triangular fossa 104, the antihelix 105, the scapha 106, and the helix 107. Furthermore, for example, the entire or partial structure of the sound generating unit 11 may be located within a cavity formed by one or more parts of the ear 100 (e.g., the cavity of the concha 102, the concha navicularis 103, and the triangular fossa 104) (e.g., the region M1 surrounded by the dotted line in Figure 1, which includes at least the concha navicularis 103 and the triangular fossa 104, and the region M2 including at least the cavity of the concha 102).

[0017] To improve the stability of the earphone 10 when worn, the earphone 10 can use any one of the following methods or a combination thereof. In method 1, at least a portion of the suspension structure 12 is configured as a contoured structure that fits to at least one of the posterior inner surface of the pinna and the head, thereby increasing the contact area between the suspension structure 12 and the ear and / or head and increasing the resistance of the acoustic device 10 to falling off from the ear. In method 2, at least a portion of the suspension structure 12 is configured as an elastic structure, which allows this portion to have a certain amount of deformation when worn, increasing the positive pressure applied by the suspension structure 12 to the ear and / or head and increasing the resistance of the earphone 10 to falling off from the ear. In method 3, at least a portion of the suspension structure 12 is configured to abut against the ear and / or head when worn, thereby generating a reaction force that presses against the ear and presses the sound generating unit 11 against the anterior outer surface of the pinna (e.g., areas M1 and M2 shown in FIG. 1 ), increasing the resistance of the earphone 10 to falling off from the ear. In method 4, the sound generating unit 11 and the suspension structure 12 are arranged to clamp the antihelical region, the region where the concha is located, etc. from both the anterior lateral surface and the posterior medial surface of the auricle when worn, thereby increasing the resistance of the earphone 10 to falling out of the ear. In method 5, the sound generating unit 11 or the structure connected thereto is arranged so that at least a portion is inserted into a cavity such as the concha cavity 102, the concha navicularis 103, the triangular fossa 104, or the scapha scapha 106, thereby increasing the resistance of the earphone 10 to falling out of the ear.

[0018] For example, as shown in FIG. 3 , when the earphone 10 is worn, the end FE (also referred to as the free end) of the sound generating unit 11 may be inserted into the cavity of the concha. Preferably, the sound generating unit 11 and the suspension structure 12 may be arranged to jointly sandwich the ear region corresponding to the cavity of the concha from both the front and rear of the ear region, in order to increase the resistance of the earphone 10 to falling out of the ear and further improve the stability of the earphone 10 when worn. For example, the end FE of the sound generating unit is pressed into the cavity of the concha in the thickness direction Z. Also, for example, the end FE abuts against the cavity of the concha in the major axis direction X and / or the minor axis direction Y (for example, abuts against the inner wall of the cavity of the concha that faces the end FE). Note that the end FE of the sound generating unit 11 is the end of the sound generating unit 11 that is arranged opposite the fixed end connected to the suspension structure 12, and is also referred to as the free end. The sound generating unit 11 may have a regular or irregular structure, but will be described here as an example to further explain the end FE of the sound generating unit 11. For example, if the sound generating unit 11 has a rectangular parallelepiped structure, the end wall surface of the sound generating unit 11 is a plane, and in this case, the end FE of the sound generating unit 11 is an end side wall of the sound generating unit 11 that is provided opposite the fixed end of the sound generating unit 11 that is connected to the hanging structure 12. Furthermore, if the sound generating unit 11 has a spherical, ellipsoidal, or irregular structure, the end FE of the sound generating unit 11 may be a specific region away from the fixed end that is obtained by cutting the sound generating unit 11 along the YZ plane (a plane formed by the minor axis direction Y and the thickness direction Z), and the ratio of the dimension of the specific region along the major axis direction X to the dimension of the sound generating unit along the major axis direction X may be 0.05 to 0.2.

[0019] By inserting at least a portion of the sound-generating unit 11 into the cavity of the concha, it is possible to increase the listening volume at the listening position (e.g., the opening of the ear canal), especially the listening volume for mid-low frequencies, while still maintaining a good effect of canceling sound leakage in the far field. Simply by way of illustrative example, when the entire or partial structure of the sound-generating unit 11 is inserted into the cavity of the concha 102, the sound-generating unit 11 and the cavity of the concha 102 form a structure similar to a cavity (hereinafter abbreviated as a "similar cavity structure"). In the embodiments of the specification, the "similar cavity structure" may be understood as a semi-enclosed structure surrounded by the side walls of the sound-generating unit 11 and the cavity of the concha 102 structure, and this semi-enclosed structure does not completely seal and isolate the listening position (e.g., the opening of the ear canal) from the external environment, but has a leaking structure (e.g., an opening, a gap, a tube, etc.) that acoustically communicates with the external environment. When a user wears the earphone 10, one or more sound output holes may be provided on a side of the housing of the sound generating unit 11 that is close to or facing the user's ear canal, and one or more decompression holes may be provided on another side wall of the housing of the sound generating unit 11 (for example, a side wall that is away from or facing away from the user's ear canal), where the sound output holes are acoustically coupled to the front cavity of the earphone 10, and the decompression holes may be acoustically coupled to the rear cavity of the earphone 10. Taking the sound generating unit 11 as an example, where the sound output from the sound output hole and the sound output from the decompression hole can be considered to be approximately two sound sources, where the sound phases of the two sound sources are opposite and form a dipole, the sound generating unit 11 and the inner wall corresponding to the cavity of the concha 102 form a similar cavity structure, the sound source corresponding to the sound output hole is located inside the similar cavity structure, and the sound source corresponding to the decompression hole is located outside the similar cavity structure, forming the acoustic model shown in FIG. 4, the similar cavity structure 402 may include a listening position and at least one sound source 401A. Here, "including" may indicate that at least one of the listening position and the sound source 401A is inside the similar cavity structure 402, or that at least one of the listening position and the sound source 401A is on the edge of the similar cavity structure 402.The listening position may be equivalent to the ear canal opening, an acoustic reference point of the ear, such as the ERP or DRP, or an entrance structure that guides the listener. Sound source 401B is located outside the analogous cavity structure 402, and anti-phase sound sources 401A and 401B form a dipole. The dipoles each radiate sound into the surrounding space, causing sound wave interference cancellation and achieving a sound leakage cancellation effect. Because the difference in acoustic distance between the two sounds is large at the listening position, the sound cancellation effect is not significant, and the sound heard at the listening position is louder than at other positions. Specifically, because sound source 401A is surrounded by the analogous cavity structure 402, most of the radiated sound reaches the listening position via direct or reflected radiation. In contrast, without the analogous cavity structure 402, most of the sound radiated from sound source 401A would not reach the listening position. Therefore, providing the analogous cavity structure 402 significantly increases the volume of the sound reaching the listening position. Furthermore, only a small portion of the anti-phase sound radiated from the anti-phase sound source 401B outside the analogous cavity structure 402 enters the analogous cavity structure 402 via the leakage structure 403 of the analogous cavity structure 402. This corresponds to the secondary sound source 401B' having an intensity significantly smaller than that of the sound source 401B and significantly smaller than that of the sound source 401A being generated in the leakage structure 403. The sound generated by the secondary sound source 401B' has a low effect of anti-phase cancellation with the sound source 401A within the cavity, thereby significantly increasing the listening volume at the listening position. Regarding sound leakage, when sound source 401A radiates sound to the outside through cavity leaking structure 402, this corresponds to the generation of secondary sound source 401A' in leaking structure 402. Most of the sound radiated from sound source 401A is output from leaking structure 403, and since the scale of similar cavity structure 402 is much smaller (at least one order of magnitude smaller) than the spatial scale for evaluating sound leakage, the intensity of secondary sound source 401A' is considered to correspond to the intensity of sound source 401A. The canceling effect of the sounds generated by secondary sound source 401A' and sound source 401B in the external space corresponds to the canceling effect of the sounds generated by sound source 401A and sound source 401B. In other words, the similar cavity structure still maintains a certain degree of sound leakage reduction effect.

[0020] In a specific application scenario, the outer wall surface of the housing of the sound generating unit 11 is usually flat or curved, and the contour of the user's concha has an uneven structure. By inserting a part or the entire structure of the sound generating unit 11 into the concha, a similar cavity structure that communicates with the outside is formed between the sound generating unit 11 and the contour of the concha. Furthermore, by providing sound emission holes on the housing of the sound generating unit toward the opening of the user's ear canal and close to the edge of the concha, and providing pressure reduction holes away from the opening of the ear canal of the sound generating unit 11 or away from the opening of the ear canal, the acoustic model shown in Figure 4 can be constructed, which allows the listening volume at the user's ear canal to be increased and sound leakage in the far field to be reduced when the user is wearing earphones.

[0021] FIG. 5 is an exemplary schematic diagram of an earphone according to some embodiments of the present disclosure.

[0022] As shown in FIG. 5 , earphone 10 includes an audio generating unit 11 and a suspension structure 12. In some embodiments, earphone 10's audio generating unit 11 may include a transducer and a housing for accommodating the transducer. The transducer is a device that receives an electrical signal, converts it into an audio signal, and outputs it. In some embodiments, when distinguished according to frequency, the transducer types may include a low-frequency (e.g., 30 Hz to 150 Hz) speaker, a mid-low frequency (e.g., 150 Hz to 500 Hz) speaker, a mid-high frequency (e.g., 500 Hz to 5 kHz) speaker, a high frequency (e.g., 5 kHz to 16 kHz) speaker, or a full-frequency (e.g., 30 Hz to 16 kHz) speaker, or any combination thereof. Here, low frequency, high frequency, etc., only represent a rough range of frequencies, and different application scenarios may have different division methods. For example, when a crossover frequency is determined, low frequency represents the frequency range below the crossover frequency, and high frequency represents the frequency range above the crossover frequency. The crossover frequency may be any value within the audible range of the human ear, such as 500 Hz, 600 Hz, 700 Hz, 800 Hz, 1000 Hz, etc.

[0023] In some embodiments, the transducer may include a single diaphragm. When the diaphragm vibrates, sound is emitted from the front and rear sides of the diaphragm. In some embodiments, a front cavity (not shown) for transmitting sound is provided in the housing at a position in front of the diaphragm. The front cavity is acoustically coupled to the sound emission hole, and sound from the front side of the diaphragm can be emitted from the sound emission hole via the front cavity. A rear cavity (not shown) for transmitting sound is provided in the housing at a position in back of the diaphragm. The rear cavity is acoustically coupled to the decompression hole, and sound from the rear side of the diaphragm can be emitted from the decompression hole via the rear cavity.

[0024] As shown in FIG. 5 , an ear hook will be described herein as an example of the suspension structure 12. In some embodiments, the ear hook may include a first portion 121 and a second portion 122 connected in sequence. In order to wear the sound generating unit 11 near the user's ear canal at a position that does not block the ear canal opening, the first portion 121 may be hung between the posterior medial surface of the user's pinna and the head, and the second portion 122 may extend to the anterior lateral surface of the pinna (the side of the pinna facing away from the head along the coronal axis) and be connected to the sound generating unit 11. In some embodiments, a sound emission hole may be formed in a side wall of the housing of the sound generating unit 11 facing the pinna to guide sound generated by the transducer out of the housing and transmit it to the user's ear canal. In some embodiments, when a user wears the earphone 10, at least a portion of the sound generating unit 11 can be inserted into the user's concha cavity (e.g., the position of the sound generating unit 11B relative to the ear shown in FIG. 2 ) to form the aforementioned similar cavity structure, thereby increasing the listening volume at the ear canal opening.

[0025] In some embodiments, the earphone 10 may further include a microphone for collecting an acoustic signal (e.g., user voice, environmental sound, etc.), and the microphone may be located in the earhook or the audio-generating unit, and the audio-generating unit or the earhook has a sound collection hole formed therein that is in acoustic communication with the microphone. In some embodiments, the earphone 10 may include a microphone assembly, and the microphone assembly may include a first microphone and a second microphone, and the first microphone and the second microphone can collect audio signals (e.g., user voice, environmental sound, etc.) at corresponding positions, respectively. In some embodiments, the first microphone and the second microphone may both be provided in the audio-generating unit 11. In some embodiments, the first microphone and the second microphone may both be provided in the earhook. In some embodiments, one of the first microphone and the second microphone may be provided in the earhook, and the other may be provided in the audio-generating unit 11. The following description will be given using Figure 5 as an example. As shown in Figure 5, a first microphone (not shown in Figure 5) is located within the ear hook, and the ear hook has a first sound collection hole 1191 that is acoustically connected to the first microphone, and a second microphone (not shown in Figure 5) is located within the sound generation unit 11, and the sound generation unit 11 has a second sound collection hole 1192 that is acoustically connected to the second microphone. When a user is wearing the earphones, neither the first sound collection hole 1191 nor the second sound collection hole 1192 is blocked, and it is possible to receive sound information when the user is speaking or external sound information.In some embodiments, the first sound collection hole 1191 and the second sound collection hole 1192 may have a two-hole structure, for example, the number of first sound collection holes 1191 is two, the first microphone corresponds to the two first sound collection holes 1191, and the two first sound collection holes 1191 are connected inside the ear hook or sound generating unit. When there are pressure fluctuations due to airflow speed in the external environment, by setting the first sound collection hole 1191 and the second sound collection hole 1192 to a two-hole structure, the pressure can be balanced outside the first sound collection hole 1191 and the second sound collection hole 1192 (the outer surface of the ear hook or sound generating unit where the sound collection holes are located) and then the pressure can be transmitted to the inside of the first sound collection hole 1191 and the second sound collection hole 1192. Because the inner central axes of the first sound collection hole 1191 and the second sound collection hole 1192 are perpendicular to the airflow direction, pressure fluctuations are reduced, and the resulting wind noise is correspondingly reduced. Therefore, providing the first microphone, the second microphone, the first sound collection hole 1191 acoustically communicating with the first microphone, and the second sound collection hole 1192 acoustically communicating with the second microphone can serve to reduce wind noise. In some embodiments, the first sound collection hole 1191 and the second sound collection hole 1192 may have a regular or irregular shape, such as a circular hole, a square hole, an elliptical hole, or a diamond hole. The shape of the first sound collection hole 1191 and the shape of the second sound collection hole 1192 may be the same or different.

[0026] FIG. 6 is an exemplary schematic diagram of an earphone in accordance with some embodiments of the present disclosure.

[0027] 5 and 6, in some embodiments, when the earphone 10 is worn, at least a portion of the sound generating unit 11 may be inserted into the user's cavity of the concha. In some embodiments, in order for the first microphone and the second microphone to have a good sound collection effect, a line connecting the first sound collection hole 1191 and the second sound collection hole 1192 may be directed toward the user's mouth. In some embodiments, in order to improve the sound collection effect when the first microphone collects sound emitted from the user's mouth, the first sound collection hole 1191 may be located closest to the mouth of the earphone 10 in the worn state. Because both the first sound collection hole 1191 and the second sound collection hole 1192 are close to the user's mouth, the sound emitted from the user's mouth is near-field sound for both the first microphone and the second microphone. Furthermore, because the distances between the first sound collecting hole 1191 and the second sound collecting hole 1192 and the user's mouth are different, there is a difference between the sound emitted from the user's mouth received by the first microphone and the second microphone (for example, the amplitude or phase of the sound is different). Noise from the environment can be regarded as far-field sound for the first microphone and the second microphone, and the noise received by the first microphone and the second microphone is almost the same (for example, the amplitude or phase of the sound is almost the same). Then, by subtracting the signal received by the second microphone from the signal received by the first microphone and then amplifying it, a good human voice effect can be obtained after noise removal.Based on this, in order to facilitate subsequent signal processing, it is necessary to set a certain distance between the first sound input hole 1191 and the second sound input hole 1192. When the earphone 10 is worn, at least a part of the sound generating unit 11 is inserted into the cavity of the concha. Therefore, on the premise that the first sound input hole 1191 is located close to the user's mouth and the distance between the first sound input hole 1191 and the second sound input hole 1192 is guaranteed, the second sound input hole 1192 may be close to the antihelix. As a result, when sound waves generated by the user's speech or external sound waves are transmitted to the antihelix, the antihelix causes a reflection effect on the sound waves. Especially within the frequency range of 3 kHz to 8 kHz, the sound received by the second microphone is louder than the sound received by the first microphone, which affects the subsequent noise reduction and sound collection effects. Based on the above issues, in some embodiments, the noise reduction and sound collection effects of the earphone can be ensured by adjusting the distance between the first sound collection hole 1191 and the second sound collection hole 1192 and the distance between the second sound collection hole 1192 and the edge of the user's antihelix. As shown in Fig. 6, when the earphone 10 is in a worn state, the first sound collection hole 1191 may have a first projection point P on the user's sagittal plane (e.g., the TS plane shown in Fig. 6), and the second sound collection hole 1192 may have a second projection point O on the user's sagittal plane. In some embodiments, to more clearly describe the positional relationship between the first sound collection hole 1191, the second sound collection hole 1192, and the antihelix of the user's pinna, the distance between the first sound collection hole 1191 and the second sound collection hole 1192 may be reflected by a first distance OP between a first projection point P of the first sound collection hole 1191 onto the sagittal plane and a second projection point O of the second sound collection hole 1192 onto the sagittal plane. In some embodiments, an extension of a line connecting the first projection point P of the first sound collection hole onto the user's sagittal plane and the second projection point O of the second sound collection hole onto the sagittal plane has an intersection point A with the projection of the user's antihelix onto the sagittal plane, and the distance between the second sound collection hole 1192 and the user's antihelix may be reflected by a second distance OA between the second projection point O of the second sound collection hole 1192 onto the sagittal plane and the intersection point A.The cavity of the concha is a recessed area below the crus helicalis, i.e., the edge of the cavity of the concha is composed of at least the lower sidewall of the crus helicalis, the contour of the tragus, the intertragic notch antitragus, the posterior auricular groove, and the contour of the antihelical body corresponding to the cavity of the concha. Based on this, in some embodiments, to ensure that the first microphone and the second microphone of the earphone 10 have good sound collection and noise reduction effects, the ratio of the first distance OP between the first projection point P and the second projection point O to the second distance OA between the second projection point O and the intersection point A may be 1.8 to 4.4. In order to reduce the influence of the antihelix on the second microphone, the distance between the second sound collecting hole 1192 and the antihelix is ​​increased, and the distance between the first sound collecting hole 1191 and the second sound collecting hole 1192 is also increased, thereby facilitating subsequent signal processing, and preferably, the ratio of the first distance OP between the first projection point P and the second projection point O to the second distance OA between the second projection point O and the intersection point A may be 2.5 to 3.8. Preferably, when the wearing position of the earphone does not change, in order to further reduce the influence of the antihelix on the second microphone, the distance between the second sound input hole 1192 and the antihelix is ​​increased, and the distance between the first sound input hole 1191 and the second sound input hole 1192 is also increased, thereby facilitating subsequent signal processing, and in some embodiments, the ratio of the first distance OP between the first projection point P and the second projection point O to the second distance OA between the second projection point O and the intersection point A may be 2.8 to 3.5. Considering the reduction of the influence of the antihelix on the second microphone and the ease of subsequent signal processing, the distance between the second sound collection hole 1192 and the antihelix may be further increased, and the distance between the first sound collection hole 1191 and the second sound collection hole 1192 may be further increased, and more preferably, the ratio of the first distance OP between the first projection point P and the second projection point O to the second distance OA between the second projection point O and the intersection point A may be 3.0 to 3.3.

[0028] In this specification, the first projection point P may be the centroid of the projection of the first sound collection hole 1191 onto the sagittal plane of the user, and similarly, the second projection point O may be the centroid of the projection of the second sound collection hole 1192 onto the sagittal plane of the user. When the dimensions of the first sound collection hole 1191 and the second sound collection hole 1192 are relatively small (for example, the diameter is smaller than 2 mm), the projections of the first sound collection hole 1191 and the second sound collection hole 1192 onto the sagittal plane can be considered to be approximately one point.

[0029] If the second sound input hole 1192 is close to the antihelix, when sound waves generated by the user's speech or external sound waves are transmitted to the antihelix, the antihelix will cause a reflection effect on the sound waves, causing the sound received by the second microphone to be louder than the sound received by the first microphone, especially within the frequency range of 3 kHz to 8 kHz, affecting subsequent noise reduction and sound collection effects. Also, due to the limited size of the sound generating unit 11, it is necessary to ensure that there is a large distance between the first sound input hole 1191 and the second sound input hole 1192. If the second sound input hole 1192 is far from the antihelix, the distance between the first sound input hole 1191 and the second sound input hole 1192 will be small, affecting subsequent signal processing. Based on this, in some embodiments, in order to ensure that there is a sufficient difference between the sound emitted from the user's mouth received by the first microphone and the second microphone, and to reduce the sound reinforcement effect at the second sound input hole 1192 due to the antihelix, the distance between the second projection point O of the second sound input hole 1192 onto the sagittal plane and the intersection point A may be 2 mm to 10 mm. In order to reduce the sound reinforcement effect at the second sound input hole 1192 due to the antihelix and improve the sound collection effect of the first microphone and the second microphone, the distance between the second sound input hole 1192 and the antihelix may be increased, and in some embodiments, the distance between the second projection point O and the intersection point A may be 4 mm to 10 mm. In order to further reduce the reflection effect of sound waves by the antihelix and further improve the sound collection effect of the first microphone and the second microphone, the distance between the second sound collection hole 1192 and the antihelix may be further increased, and preferably, the distance between the second projection point O and the intersection point A may be 6 mm to 10 mm. When the second sound collection hole 1192 is provided at a position far from the antihelix, the reflection of sound waves by the antihelix has almost no effect on the second sound collection hole 1192, and more preferably, the distance between the second projection point O and the intersection point A may be 8 mm to 10 mm.

[0030] If the distance between the first sound input hole 1191 and the second sound input hole 1192 is too small, the difference in amplitude and phase of the low-frequency audio signals received by the first microphone and the second microphone will be too small, increasing the difficulty of processing the subsequent low-frequency signals, so the distance between the first sound input hole 1191 and the second sound input hole 1192 must also not be too small.

[0031] In some embodiments, to ensure that the first microphone and the second microphone have a good sound collection effect and to facilitate subsequent signal processing, the distance between the first sound collection hole 1191 and the second sound collection hole 1192 may be 10 mm or more. In order to ensure the portability of the earphones and the comfort for users when wearing the earphones, the dimensions of the sound generation unit 11 itself should not be too large, and accordingly, the distance between the first sound collection hole 1191 and the second sound collection hole 1192 is limited by the dimensions of the sound generation unit 11, and in some embodiments, the distance between the first sound collection hole 1191 and the second sound collection hole 1192 is 50 mm or less. In some embodiments, taking into consideration the size limitations of the sound generating unit 11 itself, the good sound collection effect of the first and second microphones, and the ease of subsequent signal processing, the distance between the first sound collection hole 1191 and the second sound collection hole 1192 may be 10 mm to 50 mm. The distance between the first sound collection hole 1191 and the second sound collection hole 1192 here refers to the linear distance between the centers of the openings of the first sound collection hole 1191 and the second sound collection hole 1192 on the outer surface of the sound generating unit 11 or the ear hook 12 (for example, distance D12 shown in FIG. 5 ). Considering that an excessively large size of sound generating unit 11 affects the portability, wearing stability, and comfort of the earphones, the distance between first sound input hole 1191 and second sound input hole 1192 may be appropriately small to relatively reduce the size of sound generating unit 11, on the premise that the first and second microphones have good sound collection effects and subsequent signal processing is easy. Preferably, in some embodiments, the distance between first sound input hole 1191 and second sound input hole 1192 may be 20 mm to 47 mm. More preferably, the distance between first sound input hole 1191 and second sound input hole 1192 may be 27 mm to 32 mm so that there is a sufficient difference between the sound signals received by the first and second microphones and sound generating unit 11 has appropriate dimensions. As a specific example, the distance between first sound input hole 1191 and second sound input hole 1192 may be 26 mm.

[0032] In some embodiments, the distance between the first sound collection hole 1191 and the second sound collection hole 1192 may further be represented by the distance between a first projection point P of the first sound collection hole 1191 onto the sagittal plane and a second projection point O of the second sound collection hole 1192 onto the sagittal plane. If the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 is not parallel to the user's sagittal plane, there may be a certain difference between the distance between the first projection point P and the second projection point O, and specifically, the distance between the first sound collection hole 1191 and the second sound collection hole 1192 may be understood to be greater than the distance between the first projection point P and the second projection point O. With reference to the above description regarding the distance between the first sound input hole 1191 and the second sound input hole 1192, and taking into consideration the dimensional limitations of the sound generating unit 11 itself, the good sound collection effects of the first and second microphones, and the ease of subsequent signal processing, in some embodiments, the distance between the first projection point P of the first sound input hole 1191 onto the sagittal plane and the second projection point O of the second sound input hole 1192 onto the sagittal plane may be 8 mm to 48 mm. Preferably, the distance between the first projection point P of the first sound input hole 1191 onto the sagittal plane and the second projection point O of the second sound input hole 1192 onto the sagittal plane may be 18 mm to 45 mm. More preferably, the distance between the first projection point P of the first sound input hole 1191 onto the sagittal plane and the second projection point O of the second sound input hole 1192 onto the sagittal plane may be 25 mm to 30 mm.

[0033] In this wearing state, to facilitate subsequent signal processing, the distance between the first sound collection hole 1191 and the user's mouth (see point Q in FIG. 6) is smaller than the distance between the second sound collection hole 1192 and the user's mouth. As shown in FIG. 6, when the earphones 10 are in the wearing state, the first sound collection hole 1191 may have a first projection point P on the user's sagittal plane (e.g., the TS plane shown in FIG. 6), the second sound collection hole 1192 may have a second projection point O on the user's sagittal plane, and a third projection point Q represents the projection of the user's mouth (e.g., lips) onto the user's sagittal plane, and the user's mouth has the third projection point Q on the user's sagittal plane, and the distance between PQ is smaller than the distance between OQ.

[0034] In some embodiments, a line connecting a first projection point P of the first sound collection hole 1191 onto the user's sagittal plane and a second projection point O of the second sound collection hole 1192 onto the sagittal plane points approximately toward a third projection point Q of the user's mouth onto the sagittal plane. In this manner, a directivity algorithm can be constructed based on the sounds received by the first microphone and the second microphone to make the received user sound clearer. In some embodiments, a line PQ connecting the first projection point P and the third projection point Q may form a certain angle with a line OQ connecting the second projection point O and the third projection point Q. To ensure the directivity of the first sound collection hole 1191 and the second sound collection hole 1192, the included angle between PQ and OQ may be less than 30°. In some embodiments, the included angle between PQ and OQ may be 5° to 25°. Preferably, the included angle between PQ and OQ may be 8° to 15°. Illustratively, in some embodiments, the included angle between PQ and OQ may be 0°, 3°, 9°, 15°, etc.

[0035] 5, in some embodiments, the first sound collection hole 1191 may be provided in the second part 112 of the earhook (the part of the earhook that is close to the sound generating unit). Specifically, in some embodiments, the first sound collection hole 1191 may be provided near a connection point between the second part 122 of the earhook and the sound generating unit 11. For example, the first sound collection hole 1191 may be provided in the second part 122 of the earhook, or in the sound generating unit 11. In this specification, "the first sound collection hole 1191 may be provided near a connection point between the second part 122 of the earhook and the sound generating unit 11" may be understood to mean that the minimum distance between the first sound collection hole 1191 and the connection point is 4 mm or less. In some embodiments, the positional relationship between the first sound collection hole 1191, the earhook second portion 122, and the sound generating unit 11 may be further represented by the distance between the projection of the first sound collection hole 1191 onto the sagittal plane and the projection of the connection point onto the sagittal plane. For example, in some embodiments, the minimum distance between the projection of the first sound collection hole 1191 onto the sagittal plane and the projection of the connection point onto the sagittal plane may be 4 mm or less. When the user is wearing the earphones, the sound generating unit 11 is closer to the user's mouth, and in order to improve the sound collection effect of the first microphone, the minimum distance between the projection of the first sound collection hole 1191 onto the sagittal plane and the projection of the connection point onto the sagittal plane may preferably be 3 mm or less. In some embodiments, the first sound collection hole 1191 may be further provided at the connection point between the sound-generating unit 11 and the second earhook part 122. In this case, the first sound collection hole 1191 is closer to the user's mouth, improving the sound collection effect of the first microphone. In some embodiments, the sound-generating unit 11 and the second earhook part 122 may be independent structures, or may be connected by bonding, fitting, insertion, or other methods. The connection point between the sound-generating unit 11 and the second earhook part 122 may be the connection gap between them. The projection of the connection point between the sound-generating unit 11 and the second earhook part 122 onto the sagittal plane is the projection of the connection gap between them onto the sagittal plane.In some embodiments, the first sound collection hole 1191 is provided near the connection point between the sound generating unit 11 and the second part 122 of the earhook (for example, the first sound collection hole 1191 is provided in the second part 122 of the earhook), thereby ensuring that the first sound collection hole 1191 is close to the user and does not occupy the internal cavity space of the sound generating unit 11, which makes it easier to install the transducer and wire the internal circuitry, and effectively improves production efficiency.

[0036] In some embodiments, when the dimensions of first sound collection hole 1191 and second sound collection hole 1192 are small, they can be considered to be approximately one point. In some embodiments, when the dimensions of first sound collection hole 1191 and second sound collection hole 1192 are large, the distance between first sound collection hole 1191 and the connection point between sound generation unit 11 and second earhook part 122 may be understood as the minimum distance between the center of first sound collection hole 1191 and the connection point between sound generation unit 11 and second earhook part 122. Correspondingly, when the dimensions of first sound input hole 1191 are small, the projection of first sound input hole 1191 onto the sagittal plane can be considered to be approximately a single point, and the minimum distance between the projection of first sound input hole 1191 onto the sagittal plane and the projection of the connection point between sound generating unit 11 and second earhook part 122 onto the sagittal plane is the minimum distance between the projection point of first sound input hole 1191 onto the sagittal plane and the projection of said connection point onto the sagittal plane. When the dimensions of first sound input hole 1191 are large, the minimum distance between the projection of first sound input hole 1191 onto the sagittal plane and the projection of the connection point between sound generating unit 11 and second earhook part 122 onto the sagittal plane is the minimum distance between the centroid of the projection of first sound input hole 1191 onto the sagittal plane and the projection of said connection point onto the sagittal plane. Similarly, the distance between a sound collection hole and a certain side (e.g., inner side, upper side) of the sound generating unit 11 described elsewhere in this specification may be understood as the minimum distance from the center of the sound collection hole to the side of the sound generating unit 11.

[0037] It should be understood that the positions of the first sound collection hole 1191 and the second sound collection hole 1192 shown in Fig. 5 are merely illustrative. In some embodiments, the first sound collection hole 1191 and / or the second sound collection hole 1192 may be provided at other unobstructed positions. For example, in some embodiments, the first sound collection hole 1191 and the second sound collection hole 1192 may both be provided on the outer surface of the sound generation unit 11. Also, for example, in some embodiments, the first sound collection hole 1191 may be provided on the outer surface of the sound generation unit 11, and the second sound collection hole 1192 may be provided on the upper surface of the sound generation unit 11. In this specification, the inner surface of the sound generating unit 11 may be the surface of the earphone 10 closest to the user's head when worn (see inner surface IS in FIGS. 15A and 15B), and the upper surface of the sound generating unit 11 may be the surface of the earphone 10 farthest from the ground when worn (see upper surface US in FIGS. 15A and 15B). Correspondingly, the surface facing the inner surface can be considered the outer surface of the sound generating unit 10 (see outer surface OS in FIG. 15A), and the surface facing the upper surface can be considered the lower surface of the sound generating unit 10 (see lower surface LS in FIG. 15B). In some embodiments, each of the upper surface, lower surface, inner surface, and outer surface of the sound generating unit 11 may be flat and / or non-flat. Below, specific distribution positions of the first sound collection hole 1191 and the second sound collection hole 1192 will be described with reference to FIGS. 7 to 16B.

[0038] FIG. 7 is an exemplary schematic view of an earphone according to some other embodiments of the present disclosure.

[0039] As shown in Fig. 7, the shape of the projection of the sound generating unit 11 onto the sagittal plane may include a major axis direction X and a minor axis direction Y. Fig. 8 is a schematic diagram of an exemplary coordinate system established based on the projection of the sound generating unit onto the sagittal plane according to some embodiments of the present specification, in which a coordinate system is established with a major axis direction X and a minor axis direction Y, and the relative position of the first sound collection hole 1191 with respect to the sound generating unit 11 is represented by coordinates in the coordinate system, where the Y axis is parallel to the minor axis direction Y and is a tangent to the projection of the front side of the sound generating unit 11 onto the sagittal plane, and the X axis is parallel to the major axis direction X and is a tangent to the projection of the lower side of the sound generating unit 11 onto the sagittal plane. In some embodiments, the method for determining the position of the Y axis involves first determining the projection of the sound generating unit 11 onto the sagittal plane, finding a tangent (abbreviated as "tangent I") that is parallel to the short axis direction Y and is tangent to the projection of the rear side of the sound generating unit 11 onto the sagittal plane, determining the center of the projection of the diaphragm or magnetic circuit assembly within the sound generating unit 11 onto the sagittal plane, finding a line of symmetry of tangent I centered on that center, and defining the line of symmetry as the straight line on which the Y axis is located.

[0040] As shown in FIG. 8 , on the Y-axis, 1X may represent the line Y=1, 2X may represent the line Y=2, 3X may represent the line Y=3, and 4X may represent the line Y=4. Similarly, on the X-axis, Y1 may represent the line X=1, Y2 may represent the line X=2, and Y3 may represent the line X=3. In some embodiments, the coordinates of a point in the coordinate system may be expressed as YX. For example, on the line Y=2, since the line Y=2 is parallel to the X-axis and the value of Y=2 does not change, the coordinates of a point on this line may be uniformly expressed as 2X. When X takes different values, different positions, such as positions 21, 22, and 23, can be obtained. As shown in FIGS. 7 and 8 , in some embodiments, the sound generating unit 11 may be divided into four equal parts along the major axis direction X and the sound generating unit 11 may be divided into four equal parts along the minor axis direction Y. In some embodiments, the sound generating unit 11 may be divided into other numbers of equal parts in the long axis direction X and the short axis direction Y. Hereinafter, the sound collection situation when the first sound collection hole 1191 is located at different positions will be described based on this coordinate system.

[0041] 9 is a schematic diagram of sound collection curves when the first sound collection hole is located at different positions according to some embodiments of the present specification. As shown in FIG. 9, when Y=1, the coordinate along the X-axis direction on the line Y=1 can be uniformly expressed as 1X, and when X takes different values, corresponding positions, such as position 11, position 12, position 13, position 14, etc., can be determined. As shown in FIG. 9 , in order to ensure that the first microphone has a good sound collection effect, that the second sound collection hole can maintain a specific distance from the first sound collection hole, and that the second sound collection hole is as far away from the antihelix as possible, the ratio of the distance in the long axis direction X between the first projection point P of the first sound collection hole 1191 onto the sagittal plane and the projection of the anterior surface of the sound generating unit 11 onto the sagittal plane to the dimension along the long axis direction X of the projection of the sound generating unit 11 onto the sagittal plane may be 0.75 or less, that is, when the sound generating unit 11 is divided into four equal parts along the long axis direction X, the first projection point P is located in the region X≦3. In order to bring first sound collection hole 1191 closer to the user's mouth and improve the sound collection effect of the first microphone, preferably, the ratio of the distance in the major axis direction X between first projection point P of first sound collection hole 1191 on the sagittal plane and the projection of the front side surface of sound generation unit 11 on the sagittal plane to the dimension of the projection of sound generation unit 11 on the sagittal plane along the major axis direction X may be 0.5 or less. More preferably, in order to bring first sound collection hole 1191 closer to the user's mouth and improve the sound collection effect of the first microphone, the ratio of the distance in the major axis direction X between first projection point P of first sound collection hole 1191 on the sagittal plane and the projection of the front side surface of sound generation unit 11 on the sagittal plane to the dimension of the projection of sound generation unit 11 on the sagittal plane along the major axis direction X may be 0.3 or less.More preferably, in order to bring the first sound collection hole 1191 closer to the user's mouth and improve the sound collection effect of the first microphone, the ratio of the distance in the long axis direction X between the first projection point P of the first sound collection hole 1191 onto the sagittal plane and the projection of the front side of the sound generating unit 11 onto the sagittal plane to the dimension along the long axis direction X of the projection of the sound generating unit 11 onto the sagittal plane may be 0.2 or less. By arranging the first sound collection hole 1191 at a position close to the front side of the sound generating unit, there are more options for the position of the second sound collection hole 1192, and it is possible to ensure that the second sound collection hole can maintain a specific distance from the first sound collection hole and be as far away from the antihelix as possible. Based on the above considerations, more preferably, the ratio of the distance in the major axis direction X between the first projection point P of the first sound input hole 1191 on the sagittal plane and the projection of the front side surface of the sound generating unit 11 on the sagittal plane to the dimension along the major axis direction X of the projection of the sound generating unit 11 on the sagittal plane may be 0.1 or less. Even more preferably, in some embodiments, the first sound input hole 1191 may be located on the front side surface of the sound generating unit 11. In this case, the first sound input hole 1191 is closer to the user's mouth in the horizontal direction, and the sound collection effect of the first microphone is better. Note that, for ease of understanding, the distance in the major axis direction X between the first projection point P of the first sound input hole 1191 on the sagittal plane and the projection of the front side surface of the sound generating unit 11 on the sagittal plane may be the distance between the first projection point P and the Y axis, i.e., the distance between the first projection point P and a tangent line along the minor axis direction Y that is tangent to the projection of the front side surface of the sound generating unit 11 on the sagittal plane.

[0042] FIG. 10 is a schematic diagram of sound collection curves when the first sound collection hole is located at different positions according to some other embodiments of the present specification. As shown in FIG. 10, when X=1, the coordinate along the Y-axis direction on the line X=1 may be uniformly represented as Y1. When Y takes on different values, corresponding positions, for example, positions 11, 21, 31, and 41, can be determined. FIG. 10 shows the sound collection situations of the first microphones located at positions 11, 21, 31, and 41, respectively. As can be seen from FIG. 10, the smaller the Y-axis coordinate of Y1, the closer the microphone is to the user's mouth, and the better the sound collection effect of the microphone.

[0043] Based on this, in some embodiments, in order for the first microphone to have a good sound collection effect, the ratio of the distance in the short axis direction Y between the first projection point P of the first sound collection hole 1191 onto the sagittal plane and the projection of the lower surface of the sound generating unit onto the sagittal plane to the dimension along the short axis direction Y of the projection of the sound generating unit 11 onto the sagittal plane may be 1 or less. When the first sound collection hole 1191 and the second sound collection hole 1192 are simultaneously positioned on the sound generating unit 11, if the first sound collection hole 1191 is positioned at the maximum distance from the upper surface or front surface of the sound generating unit in the long axis direction X, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 will not face the user's mouth, which will affect the sound collection effect. In consideration of this, preferably, the ratio of the distance in the short axis direction Y between the first projection point P of the first sound collection hole 1191 onto the sagittal plane and the projection of the lower surface of the sound generating unit onto the sagittal plane to the dimension in the short axis direction Y of the projection of the sound generating unit 11 onto the sagittal plane may be 0.5 or less; that is, when the sound generating unit is divided into four equal parts along the short axis direction Y, the first projection point P is positioned in an area Y≦2. More preferably, in order to bring the first sound collection hole 1191 closer to the user's mouth and improve the sound collection effect of the first microphone, in some embodiments, the ratio of the distance in the short axis direction Y between the first projection point P of the first sound collection hole 1191 onto the sagittal plane and the projection of the lower surface of the sound generating unit 11 onto the sagittal plane to the dimension along the short axis direction Y of the projection of the sound generating unit 11 onto the sagittal plane may be 0.4 or less. Preferably, the ratio of the distance in the minor axis direction Y between the first projection point P of the first sound collection hole 1191 on the sagittal plane and the projection of the lower surface of the sound generating unit 11 on the sagittal plane to the dimension of the projection of the sound generating unit 11 on the sagittal plane along the minor axis direction Y may be 0.3 or less, and by providing the first sound collection hole 1191 at a position close to the lower surface of the sound generating unit, it is possible to provide more options for the position of the second sound collection hole 1192, ensure that the second sound collection hole can maintain a specific distance from the first sound collection hole, and ensure that the line connecting the first sound collection hole and the second sound collection hole can be more accurately directed toward the user's mouth. Based on the above considerations, more preferably, the ratio of the distance in the minor axis direction Y between the first projection point P of the first sound collection hole 1191 on the sagittal plane and the projection of the lower surface of the sound generating unit 11 on the sagittal plane to the dimension of the projection of the sound generating unit 11 on the sagittal plane along the minor axis direction Y may be 0.1 or less.More preferably, the first sound collection hole 1191 may be located on the lower surface of the sound generating unit 11. In this case, the first sound collection hole 1191 is closer to the user's mouth in the vertical direction, and the sound collection effect of the first microphone is better. For ease of understanding, the distance in the minor axis direction Y between the first projection point P of the first sound collection hole 1191 onto the sagittal plane and the projection of the lower surface of the sound generating unit 11 onto the sagittal plane may be the distance between the first projection point P and the X axis, i.e., the distance between the first projection point P and a tangent line along the major axis direction X and tangent to the projection of the lower surface of the sound generating unit 11 onto the sagittal plane.

[0044] FIG. 11 is a schematic diagram of sound collection curves when the second sound collection hole is located at different positions according to some other embodiments of the present specification. As shown in FIG. 11, when Y=4, the coordinate along the X-axis direction of the line Y=4 may be uniformly expressed as 4X. When X takes on different values, corresponding positions, such as positions 41, 42, 43, and 44, can be determined. FIG. 11 shows the sound collection conditions at positions 41, 42, 43, and 44. As can be seen from FIG. 11, in the case of 4X, as X increases, the distance from the second sound collection hole to the user's antihelix decreases, and the influence of reflection from the antihelix increases. For example, when X is large, the sound collection of the second microphone in the frequency band above 3 kHz increases significantly, and therefore, there is a change rule that the sound collection of the second microphone differs around 3 kHz. In other words, if the second sound collection hole 1192 is located close to the antihelix, the sound collection effect of the second sound collection hole 1192 above 3 kHz will be stronger than that of the first sound collection hole 1191, and the sound collection effect of the first microphone and the second microphone on the sound from the user's mouth will be reduced.

[0045] FIG. 12 is a schematic diagram of sound collection curves when sound collection holes are located at different positions according to some other embodiments of the present disclosure. As shown in FIG. 12, the sound collection effect of the microphone at position 21 is higher than the sound collection effects of the microphones at positions 33, 34, 43, and 44. In some embodiments, the first sound collection hole 1191 may be located at position 21, and the second sound collection hole 1192 may be located at position 33, 34, 43, or 44. In this case, the sound collection effect of the first sound collection hole 1191 across the entire frequency band is better than that of the second sound collection hole 1192. When the second sound collection hole 1192 is located at position 33 or 34, the sound collection effect of the second sound collection hole 1192 is good and closely matches the sound collection curve of the first sound collection hole 1191. After processing the signals from the first and second microphones, the sound from the user's mouth can be acquired across a wider frequency band. When the second sound collecting hole 1192 is located at position 43 or 44, the distance between the second sound collecting hole 1192 and the first sound collecting hole 1191 is large, which is more advantageous for noise reduction. After processing the signals of the first microphone and the second microphone, a clearer voice of the user's mouth can be obtained in the low frequency range.

[0046] FIG. 13 is a schematic diagram of sound collection curves when sound collection holes are located at different positions according to some other embodiments of the present disclosure. As shown in FIG. 13, the sound collection situations of microphones at positions 11 and 14 are shown. The sound collection effect of the microphone at position 11 is better across the entire frequency band than the microphone at position 14. In some embodiments, a first sound collection hole 1191 may be located at position 11, and a second sound collection hole 1192 may be located at position 14. In this case, the sound collection effects of the first sound collection hole 1191 and the second sound collection hole 1192 are both good. After processing the signals from the first microphone and the second microphone, the sound from the user's mouth can be acquired across a wider frequency band.

[0047] FIG. 14 is a schematic diagram of sound collection curves when sound collection holes are located at different positions according to some other embodiments of the present disclosure. As shown in FIG. 14, the sound collection situations of microphones at positions 31 and 43 are shown. The sound collection effect of the microphone at position 31 is better across the entire frequency band than the microphone at position 43. In some embodiments, a first sound collection hole 1191 may be located at position 31, and a second sound collection hole 1192 may be located at position 43. In this case, the sound collection effects of the first sound collection hole 1191 and the second sound collection hole 1192 are both good. After processing the signals from the first microphone and the second microphone, the sound from the user's mouth can be acquired across a wider frequency band.

[0048] In some embodiments, the projection of the sound generating unit 11 onto the sagittal plane may be racetrack-shaped, with an intersection between extension lines of two sides of the racetrack projection that are closest to the mouth (i.e., the projections of the lower and front sides of the sound generating unit 11), and this intersection is defined as a fourth projection point (for example, the intersection point G of the X-axis and the Y-axis shown in FIG. 7 , the origin of the XY coordinate system shown in FIG. 8 ). In order to position the first sound collection hole 1191 as close as possible to the user's mouth, the distance between the first projection point P of the first sound collection hole 1191 onto the sagittal plane and the fourth projection point needs to satisfy a predetermined condition. The greater this distance, the greater the distance between the first projection point P and the intersection point G shown in FIG. 7 or the origin of the XY coordinate system shown in FIG. 8 . Correspondingly, the distance between the first sound collection hole 1191 and the user's mouth becomes greater, and the sound collection effect of the first microphone becomes worse. Based on this, in some embodiments, to ensure the sound collection effect of the first microphone, the distance between the first projection point P and the fourth projection point may be 5 mm or less. To improve the sound collection effect of the first microphone, the first sound collection hole 1191 may be provided at a position closer to the user's mouth on the sound generation unit 11, and in some embodiments, the distance between the first projection point P and the fourth projection point may be 3 mm or less. In some embodiments, to further improve the sound collection effect of the first microphone, the distance between the first projection point P and the fourth projection point may be 1 mm or less, and here, the first sound collection hole 1191 is closer to the position of the user's mouth. Note that the projection of the sound generation unit 11 onto the sagittal plane is not limited to the racetrack shape described above and may be other regular (e.g., rectangular, elliptical, circular, etc.) or irregular shapes, as long as the first sound collection hole 1191 is provided at a position close to the user's mouth or at a position close to the origin of the XY coordinate system.

[0049] 15A and 15B are exemplary schematic structural diagrams of earphones according to some other embodiments of the present specification.

[0050] 15A and 15B, in some embodiments, the first sound collection hole 1191 may be located on the lower side surface LS or the front side surface CE of the sound generating unit 11. FIGS. 16A and 16B are schematic diagrams of an exemplary coordinate system established based on the sound generating unit according to some other embodiments of the present specification. Specifically, as shown in FIG. 16A, when the first sound collection hole 1191 is located on the front side surface CE of the sound generating unit 11, the coordinate of the first sound collection hole 1191 in the major axis direction X of the sound generating unit 11 is 0, and the positional relationship between the first sound collection hole 1191 and the sound generating unit 11 may be represented by a YZ coordinate system, in which the Z axis is the thickness direction of the sound generating unit 11 and is perpendicular to the major axis direction X and the minor axis direction Y of the sound generating unit 11. 16B , when the first sound collection hole 1191 is located on the lower side surface LS of the sound generating unit 11, the coordinate of the first sound collection hole 1191 in the short-axis direction Y of the sound generating unit 11 is 0, and the positional relationship between the first sound collection hole 1191 and the sound generating unit 11 may be represented by an XZ coordinate system. A larger value of Z indicates that the first sound collection hole 1191 is farther from the inner side surface of the sound generating unit 11, a larger value of X indicates that the first sound collection hole 1191 is farther from the front side surface of the sound generating unit 11, and a larger value of Y indicates that the first sound collection hole 1191 is farther from the lower side surface of the sound generating unit 11.

[0051] If the first sound collection hole 1191 is too close to the inner surface of the sound generating unit 11 (for example, smaller than 2 mm), not only may the first sound collection hole 1191 be blocked by the user's ear while wearing the earphone, but the first microphone may also collect noise caused by friction between the user's ear and the sound generating unit 11. Considering this, it can be seen that the distance between the first sound collection hole 1191 and the inner surface of the sound generating unit 11 should not be too close, regardless of whether the first sound collection hole 1191 is located on the underside or front side of the sound generating unit 11. Furthermore, if the two ears and mouth of the human body are considered to be three points in space, the three points form an approximately isosceles triangular area, and in order to insert the sound generating unit 11 into the concave cavity of the concha when the earphones are worn, the sound generating unit 11 must be arranged at an angle; that is, if the line connecting any two points on the outer surface of the sound generating unit 11 does not point toward the triangular area and the first sound collection hole 1191 is too close to the outer surface of the sound generating unit 11 (for example, the distance between the outer surface is less than 2 mm), even if the second sound collection hole 1192 is arranged on the outer surface of the sound generating unit 11, it cannot be guaranteed that the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 will point toward the user's mouth. Based on this, in some embodiments, when the first sound collection hole 1191 is located on the underside or front side of the sound generating unit 11, in order to ensure the sound collection effect of the first sound collection hole 1191 and that the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 faces the area in front of the user, the ratio of the distance in the thickness direction Z of the sound generating unit between the first sound collection hole 1191 and the inner surface of the sound generating unit 11 to the dimension of the sound generating unit 11 along its thickness direction Z may be 0.25 to 0.7. Preferably, the ratio of the distance in the thickness direction Z of the sound generating unit 11 between the first sound collection hole 1191 and the inner surface of the sound generating unit 11 to the dimension of the sound generating unit 11 along the thickness direction Z may be 0.25 to 0.65, and here, by locating the first sound collection hole 1191 at a position relatively far from the inner surface of the sound generating unit 11, the influence of noise caused by friction between the sound generating unit 11 and the ear can be reduced, and here, by reducing the distance from the first sound collection hole 1191 to the outer surface of the sound generating unit 11, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be directed toward the user's mouth.More preferably, the ratio of the distance between first sound collection hole 1191 and the inner surface of sound generating unit 11 in the thickness direction Z of the sound generating unit to the dimension of sound generating unit 11 along the thickness direction Z may be 0.3 to 0.6. More preferably, the ratio of the distance between first sound collection hole 1191 and the inner surface of sound generating unit 11 in the thickness direction Z of the sound generating unit to the dimension of sound generating unit 11 along the thickness direction Z may be 0.3 to 0.4, and by further reducing the distance from first sound collection hole 1191 to the outer surface of sound generating unit 11, the line connecting first sound collection hole 1191 and second sound collection hole 1192 can be more accurately directed toward the user's mouth. In some embodiments, the inner surface of the sound generating unit 11 has a curved shape, and in this case, the distance in the thickness direction Z of the sound generating unit between the first sound input hole 1191 and the inner surface of the sound generating unit 11 may be equivalent to the distance between the center of the first sound input hole 1191 and a tangent plane to the inner surface of the sound generating unit 11, and the tangent plane to the inner surface of the sound generating unit 11 is a plane that is parallel to the major axis direction X and the minor axis direction Y and is tangent to the inner surface.

[0052] In some embodiments, the first sound collection hole 1191 may be provided on the earhook (for example, at a position on the earhook closest to the user's mouth), and correspondingly, in order to ensure the directionality of the line connecting the second sound collection hole 1192 and the first sound collection hole 1191, when the first sound collection hole 1191 is provided on the earhook, the second sound collection hole 1192 may be provided near the connection point between the upper surface and the front surface of the sound generating unit 11. In some embodiments, the structure or shape of the earhook of the earphone 10 can be changed to meet the position requirements necessary for forming the second sound collection hole 1192, thereby ensuring that the line connecting the second sound collection hole 1192 and the first sound collection hole 1191 is approximately directed toward the user's mouth and ensuring that the distance between the second sound collection hole 1192 and the first sound collection hole 1191 is greater than a predetermined requirement.

[0053] In some embodiments, the second sound collection hole 1192 may be provided on a side of the sound generating unit 11 that does not form the cavity of the concha and the auxiliary cavity. In some embodiments, the second sound collection hole 1192 may be provided on at least one of the upper surface US, the lower surface LS, and the outer surface OS of the sound generating unit 11, and the first sound collection hole 1191 and the second sound collection hole 1192 are both provided to avoid components (e.g., a speaker, a main control circuit board, etc.) inside the housing of the sound generating unit 11. For example, the second sound collection hole 1192 may be provided on any one of the upper surface US, the lower surface LS, and the outer surface OS of the sound generating unit 11. Furthermore, for example, the second sound collection hole 1192 may be provided at a connection point between any two of the upper surface US, the lower surface LS, and the outer surface OS of the sound generating unit 11. In some embodiments, in order to achieve a large gap between the first sound collection hole 1191 and the second sound collection hole 1192 and to achieve the directivity of the line connecting the first sound collection hole 1191 and the second sound collection hole 1192, the first sound collection hole 1191 is typically provided diagonally. For example, the first sound collection hole 1191 is provided in the lower left corner and the second sound collection hole 1192 is provided in the upper right corner as shown in FIG. 6. To more clearly explain the distribution positions of the second sound collection holes 1192, the description will be made with reference to the upper side US, lower side LS, and rear side FE of the sound generation unit 11, respectively. In some embodiments, the second sound collection hole 1192 may be located on the outer side OS of the sound generation unit 11. In some embodiments, to prevent the distance between the second sound input hole 1192 and the user's antihelix from being too small and affecting sound collection quality, the distance d6 between the second sound input hole 1192 and the rear side surface FE may be 8 mm to 12 mm. Preferably, the distance d6 between the second sound input hole 1192 and the rear side surface FE is 9 mm to 10 mm. To prevent the line connecting the first sound input hole 1191 and the second sound input hole 1192 from being unable to point toward the user's mouth, the distance between the second sound input hole 1192 and the upper side surface US or the lower side surface LS of the sound generating unit 11 should not be too large or too small. The distance d5 between the second sound input hole 1192 and the upper side surface US of the sound generating unit 11 may be 1 mm to 3 mm, or the distance d8 between the second sound input hole 1192 and the lower side surface LS may be 4 mm to 8 mm.Preferably, in some embodiments, distance d5 between second sound collection hole 1192 and upper side surface US may be 2 mm to 2.5 mm, or distance d8 between second sound collection hole 1192 and lower side surface LS may be 6 mm to 8 mm. To prevent the distance between second sound collection hole 1192 and first sound collection hole 1191 from being too small, in some embodiments, distance d7 between second sound collection hole 1192 and front side surface CE is 8 mm to 12 mm. Note that in this specification, the distances from second sound collection hole 1192 to the upper, front, rear, and lower sides of sound generating unit 11 may refer to the distances from the center of the opening of second sound collection hole 1192 on the outer surface of the housing of sound generating unit 11 to the upper, front, rear, and lower sides of sound generating unit 11. When the side surface (e.g., upper, front, rear, or lower surface) of sound generating unit 11 is flat, the distance is the distance from the center of the opening of second sound collection hole 1192 on the outer surface of the housing of sound generating unit 11 to the plane. When the side surface of sound generating unit 11 is curved, the distance may be the distance from the center of the opening of second sound collection hole 1192 on the outer surface of the housing of sound generating unit 11 to the tangent plane of the curved surface. In this specification, the tangent plane corresponding to the upper side of the sound generating unit 11 may be a plane that is parallel to the XZ plane (or coordinate system) shown in FIG. 16B and tangent to the upper side of the sound generating unit 11; similarly, the tangent plane corresponding to the lower side of the sound generating unit 11 may be a plane that is parallel to the XZ plane (or coordinate system) shown in FIG. 16B and tangent to the lower side of the sound generating unit 11; the tangent plane corresponding to the front side of the sound generating unit 11 may be a plane that is parallel to the YZ plane (or coordinate system) shown in FIG. 16A and tangent to the front side of the sound generating unit 11; and the tangent plane corresponding to the rear side of the sound generating unit 11 may be a plane that is parallel to the XZ plane (or coordinate system) shown in FIG. 16A and tangent to the rear side of the sound generating unit 11.

[0054] 17 is a schematic diagram of an example positional relationship between a first sound collection hole, a second sound collection hole, and a user's mouth according to some embodiments of the present disclosure. As shown in FIG. 17, in some embodiments, the first sound collection hole 1191 and the second sound collection hole 1192 have a good sound collection effect, so that the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 may be directed toward the user's mouth. As shown in FIG. 17, point O represents the position of the second sound collection hole 1192, point P and point P' represent two different positions of the first sound collection hole 1191, respectively, and point Q represents the position of the user's mouth. In some embodiments, the included angle between a line connecting first sound collection hole 1191 and second sound collection hole 1192 and a line connecting first sound collection hole 1191 and user's mouth Q is about 150°, i.e., the magnitude of angle OPQ and / or angle OP'Q is about 150°. By way of example only, in some embodiments, the magnitude of angle OPQ or angle OP'Q may be 140° to 180°, i.e., first sound collection hole 1191, second sound collection hole 1192 and user's mouth may be located on approximately the same straight line.

[0055] FIG. 18 is an exemplary schematic view of an earphone according to some other embodiments of the present disclosure.

[0056] When the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 faces the user's face (for example, when it is located in the midpoint between the sagittal axis S and the vertical axis T in FIG. 18 ), the first microphone and the second microphone can have a good sound collection effect, and when the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 faces the area between the user's mouth and the end point of the base of the mandible, the sound collection effect of the first microphone and the second microphone is relatively good. Based on this, in some embodiments, to improve the sound collection effect of the earphone 10, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 may face or approximately face the area between the user's mouth and the end point of the base of the mandible. In some embodiments, the end point of the base of the mandible may be the point on the user's mandible that is farthest from the user's ear.

[0057] As shown in FIG. 18, when the earphones 10 are worn, the end point of the base of the user's mandible may have a fifth projection point Q' on the user's sagittal plane, and the centroid of the projection of the user's auditory canal opening onto the sagittal plane (for example, the dotted line area 1015 in FIG. 18) is B. Because at least a portion of the sound generating unit 11 of the earphones 10 needs to be inserted into the user's concha cavity when worn, the line connecting the fifth projection point Q' and the centroid B of the projection of the user's auditory canal opening onto the sagittal plane may reflect to some extent the relative positional relationship between the sound generating unit 11 and the end point of the base of the user's mandible.

[0058] 18 , the first sound collection hole 1191 may have a first projection point P on the user's sagittal plane, and the second sound collection hole 1192 may have a second projection point O on the user's sagittal plane. In some embodiments, in order for the first sound collection hole 1191 and the second sound collection hole 1192 to have good directivity, i.e., so that the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 faces the area between the user's mouth and the end point of the base of the mandible, the included angle θ1 between the line connecting the first projection point P and the second projection point O and the line connecting the fifth projection point Q′ and the centroid B of the projection of the user's auditory canal opening onto the sagittal plane may be 45° or less. In some embodiments, the angle θ1 between the line connecting the first projection point P and the second projection point O and the line connecting the fifth projection point Q' and the centroid B of the projection of the user's ear canal opening onto the sagittal plane may be 6° to 35°, in which case the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be oriented toward the area near the user's mouth. Preferably, the angle θ1 between the line connecting the first projection point P and the second projection point O and the line connecting the fifth projection point Q' and the centroid B of the projection of the user's ear canal opening onto the sagittal plane may be 10° to 25°, in which case the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be oriented toward the user's mouth more accurately.

[0059] When a line connecting the first projection point P of the first sound collection hole 1191 onto the sagittal plane and the second projection point O of the second sound collection hole 1192 onto the sagittal plane faces the area between the user's mouth and the end point of the base of the mandible, the first microphone and the second microphone can have a good sound collection effect. Here, the distribution positions of the first projection point P and the second projection point O will be further described with reference to the user's vertical axis. Furthermore, as shown in FIG. 18, the line connecting the first projection point P and the second projection point O faces the area between the user's mouth and the end point of the base of the mandible, so as to better capture the sound when the user speaks. Correspondingly, here, the line connecting the first projection point P and the second projection point O has a corresponding critical direction, for example, has a sagittal axis S and a vertical axis T as shown in FIG. 18, and when the line connecting the first projection point P and the second projection point O is in the coordinate system ST, the sound collection effect of the first microphone and the second microphone collecting the sound when the user speaks can be ensured. 18, when the mouth is located below and to the left of the ear and the line connecting the first projection point P and the second projection point O faces the upper left, upper, lower right, upper right, or right of the ear, the sound signal obtained by the first microphone and the second microphone when the user speaks is very small, so that the line connecting the first projection point P and the second projection point O facing the left side of the ear is a critical direction, and the line connecting the first projection point P and the second projection point O facing the lower side of the ear is also a critical direction. Based on the above explanation, the critical direction referred to in the embodiments of this specification may be understood to be used to represent the critical value to which the line connecting the first projection point P and the second projection point O (or the line connecting the first sound collection hole 1191 and the second sound collection hole 1192) faces. 18, when the line connecting the first projection point P and the second projection point O faces between the two critical directions, the first microphone and the second microphone can have good directivity, where the two critical directions are represented by the user's sagittal axis S and vertical axis T. Based on this, in some embodiments, the included angle θ2 between the line connecting the first projection point P and the second projection point O and the user's vertical axis may be less than 90°.In order to improve the sound collection effect of the first and second microphones when collecting the user's voice when the user speaks by directing the line connecting the first and second projection points P and O to a region close to the user's mouth or the end point of the base of the mandible, in some embodiments, the included angle θ2 between the line connecting the first and second projection points P and O and the user's vertical axis may be in the range of 20° to 80°. Preferably, the included angle θ2 between the line connecting the first and second projection points P and O and the user's vertical axis may be in the range of 40° to 70°, and in this case, the line connecting the first and second projection points P and O is directed to the region close to the user's mouth or the end point of the base of the mandible. Preferably, the included angle θ2 between the line connecting the first projection point P and the second projection point O and the user's vertical axis may be in the range of 42° to 65°, and in this case, the line connecting the first projection point P and the second projection point O can be more accurately directed toward the user's mouth area.

[0060] FIG. 19 is an exemplary schematic view of an earphone according to some other embodiments of the present disclosure.

[0061] To further explain the distribution positions of the first sound collection hole 1191 and the second sound collection hole 1192 on the earphones, the following description will be given with reference to the user's coronal axis R. If the angle between the coronal axis and the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 is too small, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be considered to be pointing approximately to the left or right side of the human head, which will result in poor performance in capturing the user's voice when the microphone is speaking. If the angle between the coronal axis and the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 is too large, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 will be pointing directly at the user's head, which will similarly result in poor performance in capturing the user's voice when the microphone is speaking. To ensure that the line connecting the first sound collecting hole 1191 and the second sound collecting hole 1192 can face as far forward as possible from the face of the human body, the included angle between the line connecting the first sound collecting hole 1191 and the second sound collecting hole 1192 and the user's coronal axis (for example, the R axis in FIG. 18 , which is perpendicular to the user's sagittal plane (ST plane)) may be −30° to −135°, thereby ensuring that the line connecting the first sound collecting hole 1191 and the second sound collecting hole 1192 can face the front region of the face of the human body. For more information on the included angle between the line connecting the first sound collecting hole 1191 and the second sound collecting hole 1192 and the user's coronal axis, please refer to FIG. 19 and its related explanations.

[0062] 19 shows the relative relationship between a user's head and the coronal axis and sagittal axis corresponding to the user, where reference numeral 20 may represent the user's head and reference numeral 21 may represent the user's ears. As shown in Fig. 19, in some embodiments herein, the coronal axis direction shown in Fig. 19 may be used as a reference, and rays L3 and L4 may represent the critical directions of the line connecting the first sound collecting hole 1191 and the second sound collecting hole 1192. That is, when the direction of the line connecting the first sound collecting hole 1191 and the second sound collecting hole 1192 is between rays L3 and L4, the line connecting the first sound collecting hole 1191 and the second sound collecting hole 1192 can face the front of the user's face. In some embodiments, the included angle α1 between the radial line L3 and the coronal axis R is approximately 30°, and the included angle α2 between the radial line L4 and the sagittal axis S is approximately 45°, and based on this, the included angle α3 between the line connecting the first sound input hole 1191 and the second sound input hole 1192 and the user's coronal axis R may be -30° to -135°. Preferably, the included angle between the line connecting the first sound input hole 1191 and the second sound input hole 1192 and the user's coronal axis may be -50° to -125°, and in this case, the line connecting the first sound input hole 1191 and the second sound input hole 1192 faces areas near the left and right of the user's mouth. More preferably, the angle between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the user's coronal axis may be -90° to -115°, in which case the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 faces the user's mouth area. When the angle between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the user's coronal axis is -90°, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 is parallel to the user's sagittal plane. Note that the angle here is determined with the clockwise direction being positive.

[0063] FIG. 20 is an exemplary schematic view of an earphone according to some other embodiments of the present disclosure.

[0064] As shown in FIG. 20, the first sound collection hole 1191 may have a first projection point P on the user's sagittal plane, and the second sound collection hole 1192 may have a second projection point O on the user's sagittal plane, and the included angle between the line connecting the first projection point P and the second projection point O and the long axis direction X of the shape of the projection of the sound generation unit 11 onto the sagittal plane may be expressed as θ3. When the earphone 10 is worn, the position of the sound generation unit 11 relative to the ear can be considered to remain unchanged, and in this case, the angle θ4 formed by the line connecting the fifth projection point Q' of the end point of the base of the user's mandible onto the user's sagittal plane and the centroid B of the projection of the user's auditory canal opening onto the sagittal plane, and the long axis direction X of the shape of the sound generation unit 11 projected onto the sagittal plane can be considered to remain almost unchanged, and it can be understood that the closer the angle θ3 is to θ4, the better the directivity of the line connecting the first sound collection hole 1191 and the second sound collection hole 1192. Based on this, in some embodiments, the sound collection effect of the first sound collection hole 1191 and the second sound collection hole 1192 can be adjusted by controlling the angle formed by the line connecting the first projection point P and the second projection point O and the long axis direction X of the shape of the sound generation unit 11 projected onto the sagittal plane.

[0065] As shown in FIG. 20 , the sagittal axis S and the vertical axis T may represent the critical direction of the line connecting the first projection point P and the second projection point O with respect to the long axis direction X of the shape of the projection of the sound generating unit 11 onto the sagittal plane. In other words, when the line connecting the first projection point P and the second projection point O is on the coordinate system ST, the sound collection effect of the first microphone and the second microphone in collecting the sound when the user speaks can be ensured. Specifically, in some embodiments of the present specification, when the earphone 10 is worn, the included angle β1 between the long axis direction X and the sagittal axis S may be approximately 20°, the included angle β2 between the long axis direction X and the vertical axis T may be approximately 45°, and the included angle θ4 between the line connecting the fifth projection point Q' of the end point of the base of the user's mandible onto the user's sagittal plane and the centroid B of the projection of the user's auditory canal opening onto the sagittal plane and the long axis direction X of the shape of the projection of the sound generating unit 11 onto the sagittal plane may be 50° to 75°. 20 , the negative direction of the long axis direction X is defined as 0° and the counterclockwise direction is defined as positive. The angle θ3 formed by the line connecting the first projection point P and the second projection point O and the long axis direction X of the shape of the sound generating unit 11 projected onto the sagittal plane may be 20° to 135°. Preferably, the angle θ3 formed by the line connecting the first projection point P and the second projection point O and the long axis direction X of the shape of the sound generating unit 11 projected onto the sagittal plane may be 45° to 70°. In this case, the line connecting the first projection point P and the second projection point O can be oriented more accurately toward the area from the user's mouth to the end point of the base of the mandible.

[0066] Fig. 21A is an exemplary schematic diagram of an earphone according to some other embodiments of the present specification. Fig. 21B is a schematic diagram of an included angle between a line connecting a first sound collection hole and a second sound collection hole and an outer surface of a sound generating unit according to some embodiments of the present specification.

[0067] 21A and 21B , in some embodiments, the angle formed between a line connecting first sound collection hole 1191 and second sound collection hole 1192 and the outer surface of sound generating unit 11 may be represented as θ5. In some embodiments, the outer surface of sound generating unit 11 may be flat, and in this case, the angle formed between the line connecting first sound collection hole 1191 and second sound collection hole 1192 and the outer surface is the angle formed between the line connecting first sound collection hole 1191 and second sound collection hole 1192 and the plane. In some embodiments, the outer surface of sound generating unit 11 may be curved, and the angle formed between the line connecting first sound collection hole 1191 and second sound collection hole 1192 and the outer surface is the angle formed between the line connecting first sound collection hole 1191 and second sound collection hole 1192 and the plane tangent to the curved surface of the outer surface. An example will be described in which the outer surface is flat. In some embodiments, the outer surface of the sound generating unit 11 may be represented by four points M1, M2, M3, and M4 on the outer surface. In some embodiments, the first sound input hole 1191 and the second sound input hole 1192 may be located on the same side or different sides of the sound generating unit 11. For example, in some embodiments, the first sound input hole 1191 and the second sound input hole 1192 may both be located on the outer surface of the sound generating unit 11. Furthermore, for example, in some embodiments, the first sound input hole 1191 may be located on the front side of the sound generating unit 11, and the second sound input hole 1192 may be located on the outer surface of the sound generating unit 11. Furthermore, for example, in some embodiments, the first sound input hole 1191 may be located on the lower side of the sound generating unit 11, and the second sound input hole 1192 may be located on the outer surface of the sound generating unit 11.

[0068] 21B, the first sound collection hole 1191 has a projection point M5 on the outer surface M1M2M3M4, and the second sound collection hole 1192 has a projection point M6 on the outer surface M1M2M3M4. The included angle θ5 between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the outer surface of the sound generating unit 11 may be the included angle between the line connecting the projection point M5 and the projection point M6 and the line connecting the first sound collection hole 1191 and the second sound collection hole 1192.

[0069] The included angle θ5 may reflect the relative positional relationship between the first sound collection hole 1191 and the second sound collection hole 1192 in the thickness direction of the sound generating unit 11, and may also be understood to reflect to some extent the directionality of the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 with respect to the user's mouth. In some embodiments, in order to ensure that the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 has good directivity and therefore the first sound collection hole 1191 and the second sound collection hole 1192 have good sound collection effects, the included angle θ5 between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the outer surface of the sound generating unit 11 may be controlled to be 0° to 60°, in which case the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be directed approximately toward the front area of ​​the user's face, thereby allowing the first microphone and the second microphone to have good sound collection effects. In some embodiments, in order to improve the sound collection effect of the first microphone and the second microphone, the included angle θ5 between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the outer surface of the sound generation unit 11 may be 10° to 50°, and in this case, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be oriented approximately toward the areas near the left and right of the user's mouth. Preferably, in order to further improve the sound collection effect of the first microphone and the second microphone, the included angle θ5 between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the outer surface of the sound generation unit 11 may be 25° to 38°, and in this case, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be oriented toward the user's mouth.

[0070] In some embodiments, in order to improve the sound collection effect of the first sound collection hole 1191 and the second sound collection hole 1192, the first sound collection hole 1191 and the second sound collection hole 1192 need to have large area dimensions. In some embodiments, the diameter of the first sound collection hole and the second sound collection hole may be larger than 0.8 mm. In some embodiments, in order to further improve the sound collection effect of the first sound collection hole 1191 and the second sound collection hole 1192, the diameter of the first sound collection hole and the second sound collection hole may be larger than 0.85 mm. In some embodiments, the diameter of the first sound collection hole and the second sound collection hole may be 0.9 mm.

[0071] In some embodiments, the area dimensions of the first sound collection hole 1191 and the second sound collection hole 1192 should not be too large to improve the dustproof and waterproof effects of the first sound collection hole 1191 and the second sound collection hole 1192. Based on this, in some embodiments, the diameters of the first sound collection hole 1191 and the second sound collection hole 1192 may be 0.8 mm to 3 mm to simultaneously ensure the sound collection effect and dustproof and waterproof performance of the first sound collection hole 1191 and the second sound collection hole 1192. For example, in some embodiments, the diameters of the first sound collection hole 1191 and the second sound collection hole 1192 may be 0.8 mm to 2.5 mm to further improve the dustproof and waterproof performance of the first sound collection hole 1191 and the second sound collection hole 1192. Preferably, in order to further improve the sound collection effect and dustproof and waterproof performance of first sound collection hole 1191 and second sound collection hole 1192, the diameter of first sound collection hole 1191 and second sound collection hole 1192 may be 0.85 mm to 1.5 mm. Note that in this specification, first sound collection hole 1191 and second sound collection hole 1192 may have the same or different hole diameters. When first sound collection hole 1191 and / or second sound collection hole 1192 have an irregular shape, the diameter may be understood as the maximum inner diameter or the average inner diameter.

[0072] In some embodiments, if the depth of the first sound collection hole 1191 and the second sound collection hole 1192 is too large (e.g., greater than 8 mm), sound may be lost in the process of being transmitted to the first microphone and the second microphone, and mid- to high-frequency sounds may become sharper. Therefore, in order to ensure the sound collection effect of the first sound collection hole 1191 and the second sound collection hole 1192, the depth of the first sound collection hole 1191 and / or the second sound collection hole 1192 may be less than 4 mm. In some embodiments, the depth of the first sound collection hole 1191 and the second sound collection hole 1192 may be the distance from the opening to the corresponding microphone. In some embodiments, when the first microphone and the second microphone are provided in close contact with the housing, the depth of the first sound collection hole 1191 and the second sound collection hole 1192 may be equal to the thickness of the housing. For example, in some embodiments, the depth of the first sound collection hole 1191 and the second sound collection hole 1192 may both be less than 2.5 mm in order to further reduce sound loss during transmission to the first microphone and the second microphone and improve the sound collection effect of mid- to high-frequency sounds.

[0073] In some embodiments, the depths of the first sound collection hole 1191 and the second sound collection hole 1192 may be the same to maintain the sound collection effect of the first sound collection hole 1191 and the second sound collection hole 1192. If the depths of the first sound collection hole 1191 and the second sound collection hole 1192 do not match, some sound will propagate an extra distance and the responses to noise of the first sound collection hole 1191 and the second sound collection hole 1192 will not match, which will affect the noise reduction effect and call quality of the earphone 10.

[0074] In some embodiments, a dustproof and waterproof mesh may be further provided on the first sound collection hole 1191 and the second sound collection hole 1192. The first sound collection hole 1191 and the second sound collection hole 1192 may be sealed with, for example, a silicone rubber sleeve and double-sided tape.

[0075] In some embodiments, by designing a corresponding adjustment algorithm for the earphone 10, the earphone 10 can obviously improve low-frequency sounds at low volume and maintain the same sound at high volume, thereby avoiding damage to the speaker caused by popping sounds. By setting the adjustment algorithm, the user can autonomously adjust the sound effects of the earphone.

[0076] FIG. 22 is an exemplary schematic diagram of an earphone according to some other embodiments of the present specification.

[0077] As shown in FIG. 22 , in some embodiments, the sound generating unit 11 may further include at least one sound output hole (e.g., sound output hole 111a) and at least one decompression hole (e.g., decompression hole 111c), where the sound output hole 111a is provided on the inner surface of the sound generating unit 11 and the decompression hole 111c is provided on the lower surface of the sound generating unit 11. In some embodiments, the decompression hole 111c may be further located on any one of the upper surface, front surface, rear surface, and outer surface of the sound generating unit. In some embodiments, to prevent the sound guided from the sound output hole 111a and the decompression hole 111c from generating echoes in the first sound input hole 1191 and the second sound input hole 1192, the distances between the first sound input hole 1191 and the decompression hole 111c and the sound output hole 111a need to satisfy a certain relationship.

[0078] As shown in FIG. 22 , in some embodiments, the distance between the first sound input hole 1191 and the decompression hole 111c may be represented as d1, and the distance between the first sound input hole 1191 and the sound output hole 111a may be represented as d2. In some embodiments, the first sound input hole 1191, which mainly collects sound, may be located near an acoustic null (e.g., in an area where sound leakage between the sound output hole 111a and the decompression hole 111c is canceled out) to reduce interference with the first microphone of the speaker. Specifically, in some embodiments, to locate the first sound input hole 1191 near an acoustic null, the difference between d1 and d2 may be less than 10 mm. The smaller the difference between d1 and d2, the more sufficiently sound leakage between the sound output hole 111a and the decompression hole 111c is canceled out. In some embodiments, the difference between d1 and d2 may be less than 6 mm. Preferably, the difference between d1 and d2 may be less than 4 mm to further reduce the interference of the speaker with the first microphone.

[0079] FIG. 23 is a schematic cross-sectional view illustrating an exemplary configuration of a sound generating unit of an earphone according to some other embodiments of the present specification.

[0080] 23 , in some embodiments, a first acoustic resistive mesh 1193 may be provided at a first sound collection hole 1191, and a second acoustic resistive mesh 1194 may be provided at a second sound collection hole 1192. The first acoustic resistive mesh 1193 and the second acoustic resistive mesh 1194 may have a structure that has a certain acoustic resistance but does not completely block sound propagation, and in some embodiments, the first acoustic resistive mesh 1193 and / or the second acoustic resistive mesh 1194 may include gauze mesh and / or steel mesh. In some embodiments, the first acoustic resistive mesh 1193 and the second acoustic resistive mesh 1194 may be fixed to the first sound collection hole 1191 and the second sound collection hole 1192, respectively, by double-sided tape or adhesive. In some embodiments, the first acoustic resistance mesh 1193 and the second acoustic resistance mesh 1194 can improve the waterproof and dustproof performance of the first sound collection hole 1191 and the second sound collection hole 1192.

[0081] 23 , in some embodiments, the distance between the first acoustic resistive mesh 1193 and the outer surface of the housing of the sound generating unit 11 where the first acoustic resistive mesh 1193 is located may be represented as d3, and the distance between the second acoustic resistive mesh 1194 and the outer surface of the housing of the sound generating unit 11 where the second acoustic resistive mesh 1194 is located may be represented as d4. Note that in this specification, d3 and d4 may be the same or different. For example, when the distances d3 and d4 are the same, the propagation efficiency of sound passing through the first sound collection hole 1191 and the second sound collection hole 1192 is approximately the same, ensuring the sound collection effects of the first microphone and the second microphone. For example, in some embodiments, the distance d3 between the first acoustic resistive mesh 1193 and the outer surface of the housing of the sound generating unit 11 may be 0.5 mm to 2 mm, and the distance d4 between the second acoustic resistive mesh 1194 and the outer surface of the housing of the sound generating unit 11 may be 0.5 mm to 2 mm. In some embodiments, the distance d3 between the first acoustic resistive mesh 1193 and the outer surface of the housing of the sound generating unit 11 may be 0.5 mm to 1.5 mm, and the distance d4 between the second acoustic resistive mesh 1194 and the outer surface of the housing of the sound generating unit 11 may be 0.5 mm to 1.5 mm.

[0082] In some embodiments, in order to make the frequency response of the audio received by the first microphone and the second microphone relatively flat and to improve the signal-to-noise ratio of the audio received by the first microphone and the second microphone, the first acoustic resistive mesh 1193 and the second acoustic resistive mesh 1194 need to have a certain acoustic resistance, for example an acoustic resistance greater than 45 Mrayls. For example, as the acoustic resistance of the first acoustic resistive mesh 1193 and the second acoustic resistive mesh 1194 increases, the corresponding resonant frequency of the first microphone or the second microphone moves to a lower frequency, and the peak value of the resonant peak gradually becomes gentler. In addition, in order to ensure the sound propagation efficiency at the first sound collection hole 1191 and the second sound collection hole 1192 and guarantee the sound collection effect of the first microphone and the second microphone, the acoustic resistance values ​​of the first acoustic resistive mesh 1193 and the second acoustic resistive mesh 1194 should not be too large. Based on this, in some embodiments, in order to ensure the sound collection effect of the first sound collection hole 1191 and the second sound collection hole 1192, the acoustic resistance of the first acoustic resistive mesh 1193 and the second acoustic resistive mesh 1194 may be 45 Mrayls to 320 Mrayls. Preferably, the acoustic resistance of the first acoustic resistive mesh 1193 and the second acoustic resistive mesh 1194 may be 80 Mrayls to 260 Mrayls, which ensures that the frequency response of the sound received by the first or second microphone is relatively flat, the quality of the sound signal collected by the first or second microphone is relatively high, and the first or second microphone has relatively high sensitivity to the sound signal. More preferably, the acoustic resistance of the first acoustic resistive mesh 1193 and the second acoustic resistive mesh 1194 may be 120 Mrayls to 200 Mrayls, which ensures that the first or second microphone has high sensitivity to the sound signal, and the frequency response of the sound received by the first or second microphone is flatter, improving the quality of the sound signal collected by the first or second microphone.Here, the acoustic resistance of the first acoustic resistance mesh 1193 and the second acoustic resistance mesh 1194 may be measured using an ultrasonic echo measurement method, or may be determined by the product of the density of the acoustic resistance mesh and the speed of sound.

[0083] The denser the holes in the acoustic resistive mesh, the greater the acoustic resistance corresponding to the acoustic resistive mesh, which results in a more pronounced suppression effect on the user's voice from the user's mouth and a smaller intensity of the sound collected by the microphone. Based on this, the parameters of the first acoustic resistive mesh 1193 and the second acoustic resistive mesh 1194 (e.g., mesh density, hole size, thickness, etc.) may be designed so that the first acoustic resistive mesh 1193 and the second acoustic resistive mesh 1194 have a predetermined acoustic resistance range.

[0084] For example, in some embodiments, the first acoustic resistive mesh 1193 and / or the second acoustic resistive mesh 1194 may include a plurality of holes, and the hole diameter of each mesh may be in the range of 15 μm to 51 μm. Preferably, in some embodiments, in order to ensure the waterproof and dustproof performance of the first sound collection hole 1191 and the second sound collection hole 1192 while also achieving sound propagation efficiency, the hole diameter of each hole of the first acoustic resistive mesh 1193 and the second acoustic resistive mesh 1194 may be controlled to 18 μm to 44 μm.

[0085] In some embodiments, the porosity of the first acoustically resistive mesh 1193 and / or the second acoustically resistive mesh 1194 may be in the range of 11% to 18%, where the term "porosity" may be understood as the ratio of the hole area of ​​the acoustically resistive mesh to the total area of ​​the acoustically resistive mesh, and the larger the porosity, the more holes there are in a unit area for a given hole size, and the smaller the acoustic resistance of the acoustically resistive mesh. In some embodiments, the porosity of the first acoustically resistive mesh 1193 and / or the second acoustically resistive mesh 1194 may be 11% to 18% to set the acoustic resistance of the first acoustically resistive mesh 1193 and / or the second acoustically resistive mesh 1194 to 45 Mrayls to 320 Mrayls. Similarly, in some embodiments, the thickness of the first acoustically resistive mesh 1193 and / or the second acoustically resistive mesh 1194 may be in the range of 55 μm to 108 μm, so as to provide an acoustic resistance of the first acoustically resistive mesh 1193 and / or the second acoustically resistive mesh 1194 of 45 Mrayls to 320 Mrayls.

[0086] FIG. 24 is an exemplary schematic view of an earphone according to some other embodiments of the present disclosure.

[0087] 24, in some embodiments, when the earphone 10 is in a worn state, at least a portion of the sound generating unit 11 may cover the user's antihelical region (e.g., the position of the triangular fossa, the superior crus of the antihelical, the inferior crus of the antihelical, or the antihelical, the position of the sound generating unit 11C relative to the ear shown in FIG. 2). Similarly, in some embodiments, in order to ensure that the first microphone and the second microphone have a good sound collection effect, in this worn state, the line connecting the first sound collecting hole 1191 and the second sound collecting hole 1192 may be directed toward the user's mouth.

[0088] In some embodiments, in order to improve the sound collection effect when the first microphone collects sound emitted from the user's mouth, the first sound collection hole 1191 may be located in a position close to the mouth of the earphone 10 in a wearing state in which at least a portion of the sound generation unit 11 covers the antihelix region of the user (hereinafter abbreviated as the second wearing state). As with the wearing method in which at least a portion of the sound generation unit 11 is inserted into the cavity of the concha of the user, in order to facilitate subsequent signal processing, the wearing method of the earphone 10 also requires a certain distance between the first sound collection hole 1191 and the second sound collection hole 1192 when at least a portion of the sound generation unit 11 covers the antihelix region of the user. Furthermore, when the earphone 10 is worn with at least a portion of the sound generating unit 11 covering the antihelix region of the user, at least a portion of the sound generating unit 11 abuts against the inner wall of the user's pinna (e.g., the inner contour 1014). Therefore, on the premise that the first sound input hole 1191 is located close to the user's mouth and that there must be a certain distance between the first sound input hole 1191 and the second sound input hole 1192, the second sound input hole 1192 may be close to the inner contour 1014. As a result, when sound waves generated by the user's speech or external sound waves are transmitted to the inner contour 1014, the inner contour 1014 may cause a reflection effect on the sound waves. In particular, within the frequency range of 3 kHz to 4 kHz, the sound received by the second microphone will be louder than the sound received by the first microphone, affecting the subsequent noise reduction and sound collection effects. Based on the above issues, in some embodiments, the noise reduction and sound collection effects of the earphone can be ensured by adjusting the distance between the first sound collection hole 1191 and the second sound collection hole 1192 and the distance between the second sound collection hole 1192 and the inner contour 1014 of the user's pinna. As shown in Fig. 24, when the earphone 10 is in the second wearing state, the first sound collection hole 1191 may have a first projection point P on the user's sagittal plane (e.g., the TS plane shown in Fig. 24), and the second sound collection hole 1192 may have a second projection point O on the user's sagittal plane.In some embodiments, in order to more clearly explain the positional relationship between the first sound collection hole 1191, the second sound collection hole 1192 and the inner contour 1014 of the user's pinna, the distance between the first sound collection hole 1191 and the second sound collection hole 1192 may be represented by a first distance OP between a first projection point P of the first sound collection hole 1191 onto the sagittal plane and a second projection point O of the second sound collection hole 1192 onto the sagittal plane. In some embodiments, an extension of a line connecting a first projection point P of the first sound collection hole onto the user's sagittal plane and a second projection point O of the second sound collection hole onto the sagittal plane, and a projection of the inner contour 1014 of the user's pinna onto the sagittal plane, has an intersection point C, and the distance between the second sound collection hole 1192 and the inner contour 1014 of the pinna may be represented by a second distance OC between the second projection point O of the second sound collection hole 1192 onto the sagittal plane and the intersection point C. In some embodiments, to ensure that the first microphone and the second microphone of the earphone 10 have good sound collection and noise reduction effects in the second wearing state, the ratio of the first distance OP between the first projection point P and the second projection point O to the second distance OC between the second projection point O and the intersection point C may be 1.8 to 4.4. In order to reduce the influence of the inner contour of the pinna on the second microphone, the distance between the second sound collection hole 1192 and the inner contour of the pinna is increased, and the distance between the first sound collection hole 1191 and the second sound collection hole 1192 is also increased, thereby facilitating subsequent signal processing, and preferably, the ratio of the first distance OP between the first projection point P and the second projection point O to the second distance OC between the second projection point O and the intersection point C may be 2.5 to 3.8. Preferably, when the wearing position of the earphone does not change, in order to further reduce the influence of the inner contour of the pinna on the second microphone, the distance between the second sound collection hole 1192 and the inner contour of the pinna is increased, and the distance between the first sound collection hole 1191 and the second sound collection hole 1192 is also increased, thereby facilitating subsequent signal processing, and in some embodiments, the ratio of the first distance OP between the first projection point P and the second projection point O to the second distance OC between the second projection point O and the intersection point C may be 2.8 to 3.5.Considering the reduction of the influence of the inner contour of the pinna on the second microphone and the ease of subsequent signal processing, the distance between the second sound collection hole 1192 and the inner contour of the pinna may be further increased, and the distance between the first sound collection hole 1191 and the second sound collection hole 1192 may be further increased, and more preferably, the ratio of the first distance OP between the first projection point P and the second projection point O to the second distance OC between the second projection point O and the intersection point C may be 3.0 to 3.3.

[0089] In some embodiments, if the second sound input hole 1192 is close to the inner contour 1014 of the pinna, when sound waves generated by the user's speech or external sound waves are transmitted to the inner contour 1014 of the pinna, the inner contour 1014 of the pinna may cause a reflection effect on the sound waves, causing the sound received by the second microphone to be louder than the sound received by the first microphone, especially in the frequency range of 3 kHz to 8 kHz, thereby affecting subsequent noise reduction and sound collection effects. Also, due to the limited size of the sound generating unit 11, it is necessary to ensure that there is a large distance between the first sound input hole 1191 and the second sound input hole 1192. If the second sound input hole 1192 is far from the inner contour 1014 of the pinna, the distance between the first sound input hole 1191 and the second sound input hole 1192 will be small, which will affect subsequent signal processing.

[0090] 25A-25D are schematic diagrams of corresponding frequency response curves for different distances between the second projection point O and the intersection point C according to some embodiments herein.

[0091] 25A, curves 2501 and 2502 are schematic diagrams of the frequency response curves of the first microphone and the second microphone, respectively, when the first distance OP between the first projection point P and the second projection point O is 20 mm, the second distance OC between the second projection point O and the intersection point C is 8 mm, and the second sound collection hole 1192 is located on the upper surface of the sound generation unit 11. As can be seen from Fig. 25A, when the second sound collection hole 1192 is located on the upper surface of the sound generation unit 11 and the second distance OC between the second projection point O and the intersection point C is 8 mm, the sound collection of the first microphone is better than that of the second microphone across the entire frequency band, and the sound responses of the first microphone and the second microphone are the same, so the overall sound collection situation is relatively ideal.

[0092] 25B, curves 2503 and 2504 are schematic diagrams of the frequency response curves of the first microphone and the second microphone, respectively, when the first distance OP between the first projection point P and the second projection point O is 20 mm and the second distance OC between the second projection point O and the intersection point C is 6 mm, and similar to the scene shown in FIG. 25A, the second sound collection hole 1192 is located on the upper surface of the sound generation unit 11. As can be seen from FIG. 25B, when the second sound collection hole 1192 is located on the upper surface of the sound generation unit 11 and the second distance OC between the second projection point O and the intersection point C is 6 mm, the difference in amplitude between the sound collected by the first microphone and the second microphone in the frequency band of 4k or more is small, which may affect the sound collection effect of the entire microphone assembly on the sound from the user's mouth and may result in a loss of high-frequency components.

[0093] 25C, curves 2505 and 2506 are schematic diagrams of the frequency response curves of the first microphone and the second microphone, respectively, when the first distance OP between the first projection point P and the second projection point O is 20 mm, and the second distance OC between the second projection point O and the intersection point C is 4 mm, and similar to the scenes shown in FIGS. 25A and 25B, the second sound collection hole 1192 is located on the upper surface of the sound generation unit 11. As can be seen from FIG. 25C, when the second sound collection hole 1192 is located on the upper surface of the sound generation unit 11 and the second distance OC between the second projection point O and the intersection point C is 4 mm, the difference in sound collection amplitude in the 2.2k to 4k frequency band of the sound collected by the first microphone and the second microphone is significantly reduced, further narrowing the frequency band of sound that can be successfully collected.

[0094] 25D, curves 2507 and 2508 are schematic diagrams of the frequency response curves of the first microphone and the second microphone, respectively, when the first distance OP between the first projection point P and the second projection point O is 20 mm and the second distance OC between the second projection point O and the intersection point C is 2 mm. As in the scenes shown in FIGS. 25A to 25C, the second sound collection hole 1192 is located on the upper surface of the sound generation unit 11. As can be seen from FIG. 25D, when the second sound collection hole 1192 is located on the upper surface of the sound generation unit 11 and the second distance OC between the second projection point O and the intersection point C is 2 mm, there is almost no difference in the sound collection amplitude values ​​before and after the frequency band of 2.2 kHz or higher collected by the first microphone and the second microphone, which seriously affects the sound collection effect of the microphone assembly on the sound from the user's mouth.

[0095] In some embodiments, to ensure that the first and second microphones have good sound collection and noise reduction effects, the distance between the second projection point O of the second sound input hole 1192 onto the sagittal plane and the intersection point C may be 2 mm to 10 mm. Exemplarily, to reduce the sound wave reflection effect caused by the inner contour 1014 of the pinna and improve the sound collection effect of the first and second microphones, the distance from the second sound input hole 1192 to the inner contour 1014 of the pinna may be increased, and in some embodiments, the distance between the second projection point O and the intersection point C may be 4 mm to 10 mm. To further reduce the sound wave reflection effect caused by the inner contour 1014 of the pinna and further improve the sound collection effect of the first and second microphones, the distance from the second sound input hole 1192 to the inner contour 1014 of the pinna may be further increased, and preferably, the distance between the second projection point O and the intersection point C may be 6 mm to 10 mm. When the second sound collection hole 1192 is located far from the inner contour 1014 of the pinna, the reflection of sound waves by the inner contour 1014 of the pinna has almost no effect on the second sound collection hole 1192, and more preferably, the distance between the second projection point O and the intersection point C may be 8 mm to 10 mm.

[0096] Note that the above explanation has been given mainly for the case where the second sound collection hole 1192 is located on the upper surface of the sound generating unit 11, but when the second sound collection hole 1192 is provided on the outer surface of the sound generating unit 11, the second sound collection hole 1192 is basically on the same plane as the user's helix, so the distance between the second projection point O and the intersection point C does not have a significant impact on the sound collection effect of the second microphone, and in this case, it is sufficient to ensure that the user's helix is ​​not significantly higher than the position where the second sound collection hole 1192 is located.

[0097] Furthermore, as shown in Fig. 24, to facilitate subsequent signal processing, in the second wearing state, the distance between the first sound collection hole 1191 and the user's mouth (see point Q in Fig. 24) is smaller than the distance between the second sound collection hole 1192 and the user's mouth. As shown in Fig. 24, when the earphone 10 is in the second wearing state, the first sound collection hole 1191 may have a first projection point P on the user's sagittal plane (e.g., the TS plane shown in Fig. 24), the second sound collection hole 1192 may have a second projection point O on the user's sagittal plane, and a third projection point Q represents the projection of the user's mouth (e.g., lips) onto the user's sagittal plane, and the user's mouth has the third projection point Q on the user's sagittal plane, and the distance between PQ is smaller than the distance between OQ.

[0098] In some embodiments, a line connecting a first projection point P of the first sound input hole 1191 onto the user's sagittal plane and a second projection point O of the second sound input hole 1192 onto the sagittal plane points approximately toward a third projection point Q of the user's mouth onto the sagittal plane. In this manner, a directivity algorithm can be constructed based on the sounds received by the first microphone and the second microphone to make the received user sound clearer. In some embodiments, a line PQ connecting the first projection point P and the third projection point Q may form a certain angle with a line OQ connecting the second projection point O and the third projection point Q. To ensure the directivity of the first sound input hole 1191 and the second sound input hole 1192, the included angle between PQ and OQ may be less than 30°. In some embodiments, the included angle between PQ and OQ may be between 0° and 25°. Preferably, the included angle between PQ and OQ may be 5° to 20°. Illustratively, in some embodiments, the included angle between PQ and OQ may be 0°, 3°, 9°, 15°, etc.

[0099] If the distance between the first sound collection hole 1191 and the second sound collection hole 1192 is too small, it becomes more difficult to process low-frequency signals (mainly because the phase difference of the low-frequency signals is small), making it difficult to achieve accurate calculations, and therefore the distance between the first sound collection hole 1191 and the second sound collection hole 1192 must not be too small either. For the distance between the first sound collection hole 1191 and the second sound collection hole 1192, please refer to the contents elsewhere in this specification, for example, Figure 7 and the corresponding contents, and a description thereof will be omitted here.

[0100] FIG. 26 is an exemplary schematic view of an earphone according to some other embodiments of the present disclosure.

[0101] As shown in FIG. 26, when the earphone 10 is in the second wearing state, the end point of the base of the user's mandible may have a fifth projection point Q' on the user's sagittal plane, the centroid of the projection of the user's auditory canal opening onto the sagittal plane (for example, the dotted area 1015 in FIG. 26) is B, and the line connecting the fifth projection point Q' and the centroid B of the projection of the user's auditory canal opening onto the sagittal plane may reflect to some extent the relative positional relationship between the sound generating unit 11 and the end point of the base of the user's mandible.

[0102] 26 , the first sound collection hole 1191 may have a first projection point P on the user's sagittal plane, and the second sound collection hole 1192 may have a second projection point O on the user's sagittal plane. In some embodiments, in order for the first sound collection hole 1191 and the second sound collection hole 1192 to have good directivity, i.e., so that the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 faces the area between the user's mouth and the end point of the base of the mandible, the included angle θ6 between the line connecting the first projection point P and the second projection point O and the line connecting the fifth projection point Q′ and the centroid B of the projection of the user's auditory canal opening onto the sagittal plane may be 45° or less. In some embodiments, when the earphone 10 is in the second wearing state, the angle θ6 between the line connecting the first projection point P and the second projection point O and the line connecting the fifth projection point Q' and the centroid B of the projection of the user's ear canal opening onto the sagittal plane may be 6° to 35°, in which case the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be oriented toward the area near the user's mouth. Preferably, the angle θ6 between the line connecting the first projection point P and the second projection point O and the line connecting the fifth projection point Q' and the centroid B of the projection of the user's ear canal opening onto the sagittal plane may be 10° to 25°, in which case the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be oriented more accurately toward the user's mouth.

[0103] 26 , the sagittal axis S and the vertical axis T may represent the critical direction of the line connecting the first sound collection hole 1191 and the second sound collection hole 1192. In other words, in some embodiments of the present specification, in order to ensure the sound collection effect of the first microphone and the second microphone collecting the sound when the user speaks, the direction of the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 may be between the sagittal axis S and the vertical axis T. The line connecting the first projection point P and the second projection point O may form a certain included angle θ7 with the user's vertical axis. The included angle θ7 may reflect the directivity of the line connecting the first sound input hole 1191 and the second sound input hole 1192. Based on this, in some embodiments, in order to ensure the sound collection effect of the first sound input hole 1191 and the second sound input hole 1192, the included angle θ7 between the line connecting the first projection point P and the second projection point O and the user's vertical axis may be in the range of 20° to 80°, in which case the line connecting the first projection point P and the second projection point O faces a region close to the user's mouth or the end point of the base of the mandible. Preferably, the included angle θ7 between the line connecting the first projection point P and the second projection point O and the user's vertical axis may be in the range of 40° to 70°, in which case the line connecting the first projection point P and the second projection point O faces a region close to the user's mouth or the end point of the base of the mandible. Preferably, the included angle θ7 between the line connecting the first projection point P and the second projection point O and the user's vertical axis may be in the range of 42° to 65°, and in this case, the line connecting the first projection point P and the second projection point O can be more accurately directed toward the user's mouth area.

[0104] FIG. 27 is an exemplary schematic view of an earphone according to some other embodiments of the present disclosure.

[0105] 27 , the projection of the sound generating unit 11 onto the sagittal plane may include a major axis direction X and a minor axis direction Y, where the major axis direction X may be the extension direction of the length of the sound generating unit 11 and the minor axis direction Y may be the extension direction of the height (or width) of the sound generating unit 11. When the earphone 10 is in the second wearing state, the first sound collection hole 1191 may have a first projection point P on the user's sagittal plane, and the second sound collection hole 1192 may have a second projection point O on the user's sagittal plane, and the included angle between the line connecting the first projection point P and the second projection point O and the major axis direction X of the shape of the projection of the sound generating unit 11 onto the sagittal plane may be represented as θ8. In some embodiments, the sound collection effect of the first sound collection hole 1191 and the second sound collection hole 1192 can be controlled by controlling the angle formed between the line connecting the first projection point P and the second projection point O and the long axis direction X of the shape of the sound generation unit 11 projected onto the sagittal plane.

[0106] 27 , the sagittal axis S and the vertical axis T may represent the critical direction of the line connecting the first projection point P and the second projection point O with respect to the long axis direction X of the shape of the projection of the sound generation unit 11 onto the sagittal plane. In other words, in some embodiments of the present specification, in order to ensure the sound collection effect of the first microphone and the second microphone collecting the sound when the user speaks, the direction of the line connecting the first projection point P and the second projection point O may be between the sagittal axis S and the vertical axis T. In some embodiments, the negative direction of the long axis direction X shown in FIG. 27 may be set to 0°, and the counterclockwise direction may be set to positive, and the angle formed by the line connecting the first projection point P and the second projection point O and the long axis direction X of the shape of the projection of the sound generation unit 11 onto the sagittal plane may be represented. Specifically, in some embodiments of the present specification, in order for the first microphone and the second microphone to have a good sound collection effect, the angle θ8 formed by the line connecting the first projection point P and the second projection point O and the major axis direction X of the shape of the sound generating unit 11 projected onto the sagittal plane may be −45° to 45°. Preferably, the angle θ8 formed by the line connecting the first projection point P and the second projection point O and the major axis direction X of the shape of the sound generating unit 11 projected onto the sagittal plane may be −25° to 30°, and in this case, the line connecting the first projection point P and the second projection point O can be directed toward a region near the region from the user's mouth to the end point of the base of the mandible. More preferably, the angle θ8 formed by the line connecting the first projection point P and the second projection point O and the major axis direction X of the shape of the sound generating unit 11 projected onto the sagittal plane may be -20° to 25°, in which case the line connecting the first projection point P and the second projection point O can be more accurately directed toward the area from the user's mouth to the end of the base of the mandible. Note that in some embodiments, the earphones may further be in the wearing state shown in Fig. 28A, in which case the upper surface or the lower surface of the sound generating unit is approximately parallel to the horizontal direction, and in which case the angle formed by the line connecting the first projection point P and the second projection point O and the major axis direction X of the shape of the sound generating unit 11 projected onto the sagittal plane may be 0° to 90°.

[0107] Similar to the wearing method in which at least a portion of the sound generating unit 11 is inserted into the user's cavity of the concha, in some embodiments, the wearing method of the earphone 10 is such that when at least a portion of the sound generating unit 11 covers the user's antihelical region, in order to ensure that the line connecting the first sound collecting hole 1191 and the second sound collecting hole 1192 has good directionality, the included angle between the line connecting the first sound collecting hole 1191 and the second sound collecting hole 1192 and the user's coronal axis (for example, the R axis in Figure 27, where the R axis is perpendicular to the user's sagittal plane (ST plane)) may be -30° to -135°. Preferably, the angle between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the user's coronal axis may be -50° to -125°, and in this case, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 faces the areas near the left and right of the user's mouth. More preferably, the angle between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the user's coronal axis may be -90° to -115°, and in this case, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 faces the area of ​​the user's mouth. When the included angle between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the user's coronal axis is -90°, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 is parallel to the user's sagittal plane.

[0108] In some embodiments, when the earphone 10 is in the second wearing state, a coordinate system may be established with the long axis direction X, short axis direction Y, and thickness direction Z of the sound generating unit 11, and the relative positions of the first sound collection hole 1191 and / or the second sound collection hole 1192 with respect to the sound generating unit 11 may be represented by coordinates in the coordinate system. For example, the distance from the first sound collection hole 1191 and / or the second sound collection hole 1192 to the inner surface of the sound generating unit 11 may be represented by a Z value in the coordinate system, the distance from the first sound collection hole 1191 and / or the second sound collection hole 1192 to the front side surface of the sound generating unit 11 may be represented by an X value in the coordinate system, and the distance from the first sound collection hole 1191 and / or the second sound collection hole 1192 to the lower side surface of the sound generating unit 11 may be represented by a Y value in the coordinate system. In some embodiments, a larger value of Z in the coordinate system may indicate that the first sound collection hole 1191 is farther away from the inner surface of the sound generating unit 11, a larger value of X may indicate that the first sound collection hole 1191 is farther away from the front surface of the sound generating unit 11, and a larger value of Y may indicate that the first sound collection hole 1191 is farther away from the lower surface of the sound generating unit 11.

[0109] Similar to the wearing mode in which at least a part of the sound generating unit 11 is inserted into the user's cavity of the concha, in some embodiments, when the earphone 10 is in the second wearing mode, in order for the first microphone to have a good sound collection effect, the ratio of the distance in the long axis direction X between the first projection point P of the first sound collecting hole 1191 onto the sagittal plane and the projection of the front side of the sound generating unit 11 onto the sagittal plane to the dimension along the long axis direction X of the projection of the sound generating unit 11 onto the sagittal plane may be 0.75 or less, that is, when the sound generating unit 11 is divided into four equal parts along the long axis direction X, the first projection point P is located in the region of X≦3. In order to bring first sound collection hole 1191 closer to the user's mouth and improve the sound collection effect of the first microphone, preferably, the ratio of the distance in the major axis direction X between first projection point P of first sound collection hole 1191 on the sagittal plane and the projection of the front side surface of sound generation unit 11 on the sagittal plane to the dimension of the projection of sound generation unit 11 on the sagittal plane along the major axis direction X may be 0.5 or less. More preferably, in order to bring first sound collection hole 1191 closer to the user's mouth and improve the sound collection effect of the first microphone, the ratio of the distance in the major axis direction X between first projection point P of first sound collection hole 1191 on the sagittal plane and the projection of the front side surface of sound generation unit 11 on the sagittal plane to the dimension of the projection of sound generation unit 11 on the sagittal plane along the major axis direction X may be 0.3 or less. More preferably, in order to bring the first sound collection hole 1191 closer to the user's mouth and improve the sound collection effect of the first microphone, the ratio of the distance in the long axis direction X between the first projection point P of the first sound collection hole 1191 onto the sagittal plane and the projection of the front side of the sound generating unit 11 onto the sagittal plane to the dimension along the long axis direction X of the projection of the sound generating unit 11 onto the sagittal plane may be 0.2 or less. By arranging the first sound collection hole 1191 at a position close to the front side of the sound generating unit, there are more options for the position of the second sound collection hole 1192, and it is possible to ensure that the second sound collection hole can maintain a specific distance from the first sound collection hole and be as far away from the antihelix as possible. Based on the above considerations, more preferably, the ratio of the distance in the long axis direction X between the first projection point P of the first sound collection hole 1191 onto the sagittal plane and the projection of the front side of the sound generating unit 11 onto the sagittal plane to the dimension along the long axis direction X of the projection of the sound generating unit 11 onto the sagittal plane may be 0.1 or less.More preferably, in some embodiments, the first sound collection hole 1191 may also be located on the front side of the sound generating unit 11, in which case the first sound collection hole 1191 is closer to the user's mouth in the horizontal direction, and the sound collection effect of the first microphone is better.

[0110] In some embodiments, in order for the first microphone to have a good sound collection effect, the ratio of the distance in the short-axis direction Y between the first projection point P of the first sound collection hole 1191 on the sagittal plane and the projection of the lower surface of the sound generating unit 11 on the sagittal plane to the dimension along the short-axis direction Y of the projection of the sound generating unit 11 on the sagittal plane to the dimension along the short-axis direction Y of the projection of the sound generating unit 11 on the sagittal plane may be 0.5 or less, that is, when the sound generating unit is divided into four equal parts along the short-axis direction Y, the first projection point P is located in a region where Y≦2. More preferably, in order to bring the first sound collection hole 1191 closer to the user's mouth and improve the sound collection effect of the first microphone, in some embodiments, the ratio of the distance in the short-axis direction Y between the first projection point P of the first sound collection hole 1191 on the sagittal plane and the projection of the lower surface of the sound generating unit 11 on the sagittal plane to the dimension along the short-axis direction Y of the projection of the sound generating unit 11 on the sagittal plane to the dimension along the short-axis direction Y of the projection of the sound generating unit 11 on the sagittal plane to the dimension Preferably, the ratio of the distance in the minor axis direction Y between the first projection point P of the first sound collection hole 1191 on the sagittal plane and the projection of the lower surface of the sound generating unit 11 on the sagittal plane to the dimension of the projection of the sound generating unit 11 on the sagittal plane along the minor axis direction Y may be 0.3 or less, and by providing the first sound collection hole 1191 at a position close to the lower surface of the sound generating unit, it is possible to provide more options for the position of the second sound collection hole 1192, ensure that the second sound collection hole can maintain a specific distance from the first sound collection hole, and ensure that the line connecting the first sound collection hole and the second sound collection hole can be more accurately directed toward the user's mouth. Based on the above considerations, more preferably, the ratio of the distance in the minor axis direction Y between the first projection point P of the first sound collection hole 1191 on the sagittal plane and the projection of the lower surface of the sound generating unit 11 on the sagittal plane to the dimension of the projection of the sound generating unit 11 on the sagittal plane along the minor axis direction Y may be 0.1 or less. More preferably, the first sound collection hole 1191 may be located on the lower surface of the sound generating unit 11, in which case the first sound collection hole 1191 is closer to the user's mouth in the vertical direction, and the sound collection effect of the first microphone is better.

[0111] Similar to a wearing method in which at least a portion of the sound generating unit 11 is inserted into the user's cavity of the concha, in some embodiments, as a wearing method of the earphone 10, when at least a portion of the sound generating unit 11 covers the antihelix region of the user, the first sound collecting hole 1191 may be located on the underside or front side of the sound generating unit 11. In some embodiments, if the first sound collecting hole 1191 is too close to the inner surface of the sound generating unit 11 (for example, smaller than 2 mm), not only may the first sound collecting hole 1191 be blocked by the user's ear during wearing, but the first microphone may also collect noise caused by friction between the user's ear and the sound generating unit 11. On the other hand, when the first sound collecting hole 1191 is located on the underside or front side of the sound generating unit 11, the greater the distance between the first sound collecting hole 1191 and the inner surface of the sound generating unit 11, the lower the volume of the sound from the user's mouth received by the first sound collecting hole 1191. Therefore, in some embodiments, in order to simultaneously ensure the sound collection effect of the first sound collection hole 1191 and the volume of the sound from the user's mouth, the ratio of the distance in the thickness direction Z of the sound generating unit 11 between the first sound collection hole 1191 and the inner surface of the sound generating unit 11 to the dimension of the sound generating unit 11 along the thickness direction Z may be 0.25 to 0.7. For example, in some embodiments, the ratio of the distance in the thickness direction Z of the sound generating unit 11 between the first sound collection hole 1191 and the inner surface of the sound generating unit 11 to the dimension of the sound generating unit 11 along the thickness direction Z may be 0.25 to 0.65, and here, by locating the first sound collection hole 1191 at a position relatively far from the inner surface of the sound generating unit 11, the influence of noise caused by friction between the sound generating unit 11 and the ear can be reduced, and here, by reducing the distance from the first sound collection hole 1191 to the outer surface of the sound generating unit 11, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be directed toward the user's mouth. Preferably, the ratio of the distance in the thickness direction Z of the sound generating unit 11 between the first sound collection hole 1191 and the inner surface of the sound generating unit 11 to the dimension of the sound generating unit 11 along its thickness direction Z may be 0.3 to 0.65, and here, by further reducing the distance from the first sound collection hole 1191 to the outer surface of the sound generating unit 11, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be more accurately directed toward the user's mouth.

[0112] 27 , in some embodiments, a projection (or an extension of the projection) of the front side of the sound generating unit 11 onto the user's sagittal plane may have an intersection point G with a projection (or an extension of the projection) of the lower side of the sound generating unit 11 onto the user's sagittal plane. The greater the distance between the first projection point P of the first sound collection hole 1191 onto the sagittal plane and the intersection point G, the greater the distance between the first projection point P and the user's mouth, indicating a poorer sound collection effect of the first microphone. Based on this, in some embodiments, to ensure the sound collection effect of the first microphone, the distance between the first projection point P and the intersection point G may be 5 mm or less. In some embodiments, the distance between the first projection point P and the fourth projection point may be 3 mm or less. In order to improve the sound collection effect of the first microphone, the first sound collection hole 1191 may be provided at a position closer to the user's mouth of the sound generating unit 11, and in some embodiments, in order to further improve the sound collection effect of the first microphone, the distance between the first projection point and the fourth projection point may be 1 mm or less, where the first sound collection hole 1191 is closer to the user's mouth.

[0113] Similar to a wearing method in which at least a portion of the sound generating unit 11 is inserted into the user's cavity of the concha, in some embodiments, when the wearing method of the earphone 10 is such that at least a portion of the sound generating unit 11 covers the antihelix region of the user, the second sound collection hole 1192 may be provided on the side of the sound generating unit 11 that does not form an auxiliary cavity with the user's antihelix. For example, the second sound collection hole 1192 may be provided on the upper surface US, lower surface LS, outer surface OS, etc. of the sound generating unit 11. In some embodiments, the second sound collection hole 1192 may be located on the outer surface OS of the sound generating unit 11. In some embodiments, to prevent the distance between the second sound input hole 1192 and the user's auricle from being too small and affecting the sound collection quality of the earphone 10, the distance between the second sound input hole 1192 and the upper surface US of the sound generating unit 11 may be 1 mm to 3 mm, and the distance between the second sound input hole 1192 and the rear surface FE (also referred to as the end FE of the sound generating unit 11) may be 8 mm to 12 mm. Preferably, in some embodiments, the distance between the second sound input hole 1192 and the upper surface US may be 2 mm to 2.5 mm, and the distance between the second sound input hole 1192 and the rear surface FE may be 9 mm to 10 mm. In some embodiments, the distance between the position of the second sound input hole 1192 and the upper surface US may be 2.47 mm, and the distance between the second sound input hole 1192 and the rear surface FE may be 9.96 mm. Similarly, to prevent the distance between second sound input hole 1192 and first sound input hole 1191 from being too small, in some embodiments, the distance between second sound input hole 1192 and front side surface CE may be 8 mm to 12 mm. Preferably, the distance between second sound input hole 1192 and front side surface CE may be 8.5 mm to 12 mm. In some embodiments, the distance between second sound input hole 1192 and lower side surface LS may be 4 mm to 8 mm. Preferably, the distance between second sound input hole 1192 and lower side surface LS may be 6 mm to 8 mm. Note that in this specification, the distances from second sound input hole 1192 to the upper, front, rear, and lower sides of sound generating unit 11 may refer to the distances from the center of the opening of second sound input hole 1192 on the outer surface of the housing of sound generating unit 11 to the upper, front, rear, and lower sides of sound generating unit 11.When the side surface (e.g., upper, front, rear, or lower surface) of sound generating unit 11 is flat, the distance may be the distance from the center of the opening of second sound collection hole 1192 on the outer surface of the housing of sound generating unit 11 to the flat surface. When the side surface of sound generating unit 11 is curved, the distance may be the distance from the center of the opening of second sound collection hole 1192 on the outer surface of the housing of sound generating unit 11 to a tangent plane corresponding to the curved surface.

[0114] Fig. 28A is an exemplary schematic diagram of an earphone according to some other embodiments of the present disclosure, and Fig. 28B is a schematic diagram of an included angle between a line connecting a first sound collection hole and a second sound collection hole and an outer surface of a sound generating unit according to some embodiments of the present disclosure.

[0115] 28A and 28B , in some embodiments, when the earphone 10 is used in the second wearing mode, the angle between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the outer surface of the sound generating unit 11 may be represented as θ9. In some embodiments, the outer surface of the sound generating unit 11 may be flat, and in this case, the angle between the line connecting the first sound collection hole and the second sound collection hole and the outer surface is the angle between the line connecting the first sound collection hole and the second sound collection hole and the plane. In some embodiments, the outer surface of the sound generating unit 11 may be curved, and the angle between the line connecting the first sound collection hole and the second sound collection hole and the outer surface is the angle between the line connecting the first sound collection hole and the second sound collection hole and a plane tangent to the curved surface of the outer surface. An example will be described in which the outer surface is flat. In some embodiments, the outer surface of the sound generating unit 11 may be represented by four points M1, M2, M3, and M4 on the outer surface. In some embodiments, the first sound input hole 1191 and the second sound input hole 1192 may be located on the same side or different sides of the sound generating unit 11. For example, the first sound input hole 1191 and the second sound input hole 1192 may both be located on the outer surface of the sound generating unit 11. Furthermore, for example, the first sound input hole 1191 may be located on the front side of the sound generating unit 11, and the second sound input hole 1192 may be located on the outer surface of the sound generating unit 11. Furthermore, for example, in some embodiments, the first sound input hole 1191 may be located on the lower side of the sound generating unit 11, and the second sound input hole 1192 may be located on the outer surface of the sound generating unit 11.

[0116] 28B , in some embodiments, the first sound collection hole 1191 has a projection point M7 on the outer surface M1M2M3M4, and the second sound collection hole 1192 may be located on the outer surface of the sound generating unit 11 (i.e., located within the plane M1M2M3M4). The included angle θ9 between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the outer surface of the sound generating unit 11 may be the included angle formed by the line connecting the projection point M7 and the second sound collection hole 1192 and the line connecting the first sound collection hole 1191 and the second sound collection hole 1192. In some embodiments, when the second sound collection hole 1192 is not located on the outer surface of the sound generating unit 11, the second sound collection hole 1192 may have a projection point M8 (not shown) on the outer surface M1M2M3M4, and the included angle θ9 between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the outer surface of the sound generating unit 11 may be the included angle between the line connecting the projection point M7 and the projection point M8 and the line connecting the first sound collection hole 1191 and the second sound collection hole 1192.

[0117] The included angle θ9 may reflect the relative positional relationship between the first sound collection hole 1191 and the second sound collection hole 1192 in the thickness direction of the sound generating unit 11, and may also be understood to reflect to some extent the directionality of the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 with respect to the user's mouth. Based on this, in some embodiments, in order to ensure that the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 has good directivity and therefore the first sound collection hole 1191 and the second sound collection hole 1192 have a good sound collection effect, the included angle θ9 between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the outer surface of the sound generating unit 11 may be controlled to be 0° to 60°, in which case the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be directed approximately toward the front area of ​​the user's face, thereby allowing the first microphone and the second microphone to have a good sound collection effect. For example, in some embodiments, in order to improve the sound collection effect of the first microphone and the second microphone, the included angle θ9 between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the outer surface of the sound generation unit 11 may be 10° to 40°, and in this case, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be oriented approximately toward the areas near the left and right of the user's mouth. Preferably, in order to further improve the sound collection effect of the first microphone and the second microphone, the included angle θ9 between the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 and the outer surface of the sound generation unit 11 may be 25° to 38°, and in this case, the line connecting the first sound collection hole 1191 and the second sound collection hole 1192 can be oriented toward the user's mouth.

[0118] For more details regarding the second wearing method, reference may be made to the content described elsewhere in this specification (e.g., the content regarding the wearing method in which at least a portion of the sound generating unit is not inserted into the user's concha) without contradiction, and further description will be omitted here.

[0119] Although the basic concepts have been described above, it will be apparent to those skilled in the art that the above detailed disclosure is merely illustrative and does not limit the present application. Although not expressly described herein, those skilled in the art may make various changes, improvements, and modifications to the present application. These changes, improvements, and modifications are intended to be suggested by the present application and therefore remain within the spirit and scope of the exemplary embodiments of the present application.

[0120] Additionally, certain terms are used herein to describe embodiments of the present application. For example, "one embodiment," "one embodiment," and / or "some embodiments" refer to particular features, structures, or characteristics associated with at least one embodiment of the present application. Therefore, it is emphasized and understood that the appearances of "one embodiment," "one embodiment," or "one alternative embodiment" more than once in various parts of this specification do not necessarily all refer to the same embodiment. Furthermore, particular features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

[0121] Similarly, in the foregoing description of embodiments of the present application, various features may be grouped together in a single embodiment, drawing, or description for the purpose of simplifying the description of the present application and facilitating an understanding of one or more embodiments of the present application. However, this method of disclosure should not be interpreted as reflecting an intention that the present subject matter requires more features than are recited in each claim. Rather, an embodiment may include fewer than all features of a single embodiment disclosed above.

[0122] Finally, it should be understood that the embodiments described herein merely illustrate the principles of the embodiments of the present application. Other variations may also be within the scope of the present application. Thus, by way of example, not limitation, alternative configurations of the embodiments of the present application may be considered consistent with the teachings of the present application. Accordingly, the embodiments of the present application are not limited to the embodiments explicitly introduced and described herein. The specific embodiments described herein are merely illustrative, and one or more technical features in the specific embodiments are optional or optional and are not required technical features that constitute the inventive concept of the present application. In other words, the scope of protection of the present application covers the specific embodiments and is much broader than them. [Explanation of symbols]

[0123] 100 ears 101 External auditory canal 102 Concha cavity 103 Concha navicular 104 Triangular fossa 105 Antihelix 106 Scaphoid fossa 107 Earrings 108 Earlobe 109 Helical foot 1013 Outer contour 1014 Inner contour 10. Earphones 11. Sound generation section 12 Hanging structure 11A Mounting position 11B Mounting position 11C Mounting position 401A sound source 401B sound source 402 Similar cavity structure 403 Leakage Structure 401A' Secondary sound source 401B' Secondary sound source 121 First Part 122 Second Part 1191 First sound collection hole 1192 Second sound collection hole 1015 dotted area 20 heads 21 Ears 111a Sound emission hole 111c Decompression hole 1193 First Acoustic Resistance Mesh 1194 Second Acoustic Resistance Mesh

Claims

1. a sound generating unit; an ear hook configured to be worn at a position near the ear canal so as not to block the ear canal opening, so that at least a part of the sound generating unit is inserted into the cavity of the concha; a microphone assembly including at least a first microphone and a second microphone, the first microphone or the second microphone being provided in the sound generating unit or the ear hook, and a first sound collecting hole and a second sound collecting hole corresponding to the first microphone and the second microphone, respectively, being formed in the sound generating unit or the ear hook; an extension of a line connecting a projection of the first sound collection hole onto a user's sagittal plane and a projection of the second sound collection hole onto the sagittal plane has an intersection with a projection of an antihelix onto the sagittal plane, a distance between the projection of the first sound collection hole onto the sagittal plane and a projection of the second sound collection hole onto the sagittal plane is a first distance, a distance between the projection of the second sound collection hole onto the sagittal plane and the intersection is a second distance, and a ratio of the first distance to the second distance is 1.8 to 4.

4.

2. The earphone of claim 1 , wherein the second distance is between 2 mm and 10 mm.

3. The earphone of claim 1 , wherein the first distance is between 10 mm and 50 mm.

4. The earphone according to any one of claims 1 to 3, wherein the ear hook is hung between the user's auricle and head, a portion of the ear hook close to the sound generating unit extends toward the anterior outer surface of the auricle and is connected to the sound generating unit, the first sound collection hole is located in the portion of the ear hook close to the sound generating unit, and the minimum distance between a projection of the first sound collection hole onto the sagittal plane and a projection of a connection point between the sound generating unit and the portion of the ear hook close to the sound generating unit onto the sagittal plane is 4 mm or less.

5. The earphone according to any one of claims 1 to 3, wherein the shape of the projection of the sound generating unit onto the sagittal plane includes a major axis direction and a minor axis direction, and the ratio of the distance in the major axis direction between the projection of the first sound collection hole onto the sagittal plane and the projection of the front side of the sound generating unit onto the sagittal plane to the dimension along the major axis direction of the projection of the sound generating unit onto the sagittal plane is 0.75 or less.

6. 6. The earphone according to claim 5, wherein a ratio of a distance in the minor axis direction between a projection of the first sound collection hole onto the sagittal plane and a projection of the lower surface of the sound generating unit onto the sagittal plane to a dimension along the minor axis direction of the projection of the sound generating unit onto the sagittal plane is 0.5 or less.

7. The earphone according to any one of claims 1 to 3, wherein the first sound collection hole is located on a lower surface or a front surface of the sound generating unit, and a ratio of a distance between the first sound collection hole and an inner surface of the sound generating unit in a thickness direction of the sound generating unit to a dimension of the sound generating unit along the thickness direction is 0.25 to 0.

4.

8. The earphone according to any one of claims 1 to 3, wherein the second sound collection hole is located on an outer surface of the sound generating unit, and the distance from the second sound collection hole to an upper surface of the sound generating unit is 1 mm to 3 mm.

9. The earphone according to claim 8, wherein the distance from the second sound collection hole to the front side surface of the sound generating unit is 8 mm to 12 mm.

10. The earphone according to any one of claims 1 to 3, wherein an included angle between a line connecting a projection of the first sound collection hole onto the sagittal plane and a projection of the second sound collection hole onto the sagittal plane and a line connecting a centroid of a projection of the end point of the base of the user's mandible onto the sagittal plane and a projection of the auditory canal opening onto the sagittal plane is 45° or less.

11. The earphone according to any one of claims 1 to 3, wherein an included angle between a line connecting a projection of the first sound collection hole onto the sagittal plane and a projection of the second sound collection hole onto the sagittal plane and a vertical axis of the user is within a range of 40° to 70°.

12. The earphone according to claim 1, wherein an included angle between a line connecting the first sound collection hole and the second sound collection hole and the outer surface is between 0° and 60°.

13. The earphone according to any one of claims 1 to 3, wherein an included angle between a line connecting the projection of the first sound collection hole onto the sagittal plane and the projection of the second sound collection hole onto the sagittal plane and a long axis direction of the shape of the projection of the sound generation unit onto the sagittal plane is 20° to 135°.

14. 4. The earphone according to claim 1, further comprising a sound output hole and a decompression hole, wherein a difference between a distance from the first sound collection hole to the sound output hole and a distance from the first sound collection hole to the decompression hole is less than 10 mm.

15. a sound generating unit; an ear hook configured to be worn at a position near the ear canal without blocking an ear canal opening so that at least a portion of the sound generating unit covers an antihelix region; a microphone assembly including at least a first microphone and a second microphone, the first microphone or the second microphone being provided in the sound generating unit or the ear hook, and a first sound collecting hole and a second sound collecting hole corresponding to the first microphone and the second microphone, respectively, being formed in the sound generating unit or the ear hook; an extension of a line connecting a projection of the first sound collection hole onto a user's sagittal plane and a projection of the second sound collection hole onto the sagittal plane has an intersection point with a projection of an inner contour of the auricle onto the sagittal plane, a distance between the projection of the first sound collection hole onto the sagittal plane and the projection of the second sound collection hole onto the sagittal plane is a first distance, a distance between the projection of the second sound collection hole onto the sagittal plane and the intersection point is a second distance, and a ratio of the first distance to the second distance is 1.8 to 4.4.

Images