Open type earphone

Abstract

The invention relates to an open-type earphone, and the earphone comprises a housing, a first end of the housing is internally provided with an installation cavity which is used for installing a first sound production unit, and a second end of the housing is internally provided with a battery compartment which is used for installing a battery; the first end is internally provided with a front sound cavity and a rear sound cavity of the first sound production unit, the shell is provided with a main sound outlet hole communicated with the front sound cavity and an auxiliary sound outlet hole communicated with the rear sound cavity, the main sound outlet hole is located outside the ear canal of a user in a wearing state and basically faces the ear of the user, and the auxiliary sound outlet hole is located outside the ear canal of the user in a wearing state. The orientations of the auxiliary sound outlet hole and the main sound outlet hole are different; the first sound production unit is used for outputting sound waves, the main sound outlet hole is used for outputting first sound waves in the sound waves, the auxiliary sound outlet hole is used for outputting second sound waves in the sound waves, the second sound waves are used for counteracting at least part of leaked sound waves, and the leaked sound waves comprise sound waves, leaked into the environment, in the first sound waves.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of audio playing, in particular to an open earphone. BACKGROUND

[0002] In recent years, audio devices such as earphones and headsets have developed greatly in technology, and there are more and more types of products, richer functions, and more and more superior performance. For example, in addition to traditional earphones, there are currently more types of earphones such as TWS (True Wireless Stereo earphones, true wireless stereo earphones), OWS (Open-Back Stereo earphones, open-back stereo earphones), and bone conduction earphones. These newly emerging earphone types have different advantages over traditional earphones, such as OWS earphones having the advantages of comfortable wearing and rich sound details. However, when wearing OWS earphones, the earphone does not completely fit the user's ear canal, and the gap between the two will cause the sound played by the earphone to leak into the environment, which will cause privacy leakage if there is private information in the sound. SUMMARY

[0003] To overcome the problems in the related art, the embodiments of the present disclosure provide an open earphone to solve the defects in the related art.

[0004] According to a first aspect of the embodiments of the present disclosure, an open earphone is provided, and the device comprises:

[0005] a housing, a mounting cavity is arranged in a first end of the housing for mounting a first sound generating unit, and a battery compartment is arranged in a second end of the housing for mounting a battery;

[0006] a connecting structure between the first end and the second end is at least partially arc-shaped and at least partially comprises an elastic material, and the elastic material changes the relative positions of the first end and the second end under an external force;

[0007] a front sound cavity and a rear sound cavity of the first sound generating unit are arranged in the first end, the housing is provided with a main sound outlet hole communicating with the front sound cavity and a secondary sound outlet hole communicating with the rear sound cavity, the main sound outlet hole is located outside the user's ear canal and substantially faces the user's ear in a wearing state, and the secondary sound outlet hole has a different orientation from the main sound outlet hole;

[0008] wherein the first sound generating unit is configured to output sound waves, the main sound outlet hole is configured to output first sound waves in the sound waves, and the secondary sound outlet hole is configured to output second sound waves in the sound waves, the second sound waves being configured to cancel at least part of the leaked sound waves, and the leaked sound waves comprising sound waves leaked to the environment from the first sound waves.

[0009] In a possible embodiment of the present disclosure, the open earphone further comprises a second sound generating unit arranged in the rear sound cavity, the second sound generating unit being configured to output a third sound wave at least towards the auxiliary sound outlet, the third sound wave and the second sound wave collectively canceling at least part of the leakage sound wave.

[0010] In a possible embodiment of the present disclosure, the second sound generating unit has the same sound source signal as the first sound generating unit.

[0011] In a possible embodiment of the present disclosure, the leakage sound wave and the third sound wave satisfy at least one of the following conditions:

[0012] The leakage sound wave and the third sound wave satisfy a phase and amplitude condition of mutual cancellation in a preset frequency band.

[0013] The leakage sound wave and the third sound wave satisfy a phase and amplitude condition of mutual cancellation in a preset direction.

[0014] In a possible embodiment of the present disclosure, the open earphone further comprises:

[0015] An audio control port configured to output an electrical signal.

[0016] An inverting unit electrically connected between the audio control port and the second sound generating unit, configured to invert the electrical signal and output the inverted electrical signal to the second sound generating unit, so that the second sound generating unit can generate the third sound wave.

[0017] The first sound generating unit is electrically connected to the audio control port and configured to generate the first sound wave and the second sound wave based on the electrical signal.

[0018] In a possible embodiment of the present disclosure, the open earphone further comprises:

[0019] A first switching unit electrically connected between the audio control port and the first sound generating unit, configured to perform digital-to-analog conversion on the electrical signal output by the audio control port to obtain a first analog signal.

[0020] A second switching unit electrically connected between the inverting unit and the second sound generating unit, configured to perform digital-to-analog conversion on the inverted electrical signal output by the inverting unit to obtain a second analog signal.

[0021] In a possible embodiment of the present disclosure, the preset frequency band includes a frequency band corresponding to a voice call sound wave, or a frequency band with the maximum loudness among a plurality of frequency bands.

[0022] In a possible embodiment of the present disclosure, the second sound generating unit is arranged at a position away from the first sound generating unit in the rear sound cavity.

[0023] In a possible embodiment of the present disclosure, the first sound generating unit comprises a speaker unit; and / or, the second sound generating unit comprises a speaker unit.

[0024] In a possible embodiment of the present disclosure, the first end comprises a front wall, a back wall, and side walls connected to the front wall and the back wall respectively; the main sound outlet hole is arranged on the front wall, and the auxiliary sound outlet hole is symmetrically arranged on the back wall and / or the side wall.

[0025] In a possible embodiment of the present disclosure, the first sound generating unit is arranged in the mounting cavity close to the front wall.

[0026] In a possible embodiment of the present disclosure, the front wall of the shell is of a sound wave conducting material, and the back wall and the side wall are of a sound wave shielding material.

[0027] The technical scheme provided by the embodiments of the present disclosure can have the following beneficial effects:

[0028] The open earphone provided by the embodiments of the present disclosure can output the sound wave output by the first sound generating unit in the mounting cavity as the first sound wave through the main sound outlet hole communicating with the front sound cavity, and the first sound wave is used to transmit to the ear canal of the user, and at the same time inevitably leaks through the gap between the shell and the ear canal to form the leakage sound wave; and the sound wave output by the first sound generating unit can also be output as the second sound wave through the auxiliary sound outlet hole communicating with the back sound cavity, and since the front sound cavity and the back sound cavity are opposite in direction, the main sound outlet hole and the auxiliary sound outlet hole are different in direction, and the phase difference between the leakage sound wave and the second sound wave output by the auxiliary sound outlet hole is about 180°, therefore, the second sound wave output by the auxiliary sound outlet hole can suppress or even eliminate the leakage sound wave, that is, can offset the leakage sound wave, thereby avoiding the leakage of the private information in the leakage sound wave. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0030] Figure 1 is a schematic diagram of an OWS earphone according to an example embodiment of the present disclosure;

[0031] Figure 2 is a schematic diagram of an open earphone according to an example embodiment of the present disclosure;

[0032] Figure 3 is a schematic diagram of an open earphone according to an example embodiment of the present disclosure;

[0033] Figure 4 is a schematic diagram of a user in different directions according to an example embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0035] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0036] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining."

[0037] In recent years, audio devices such as headphones and headsets have made great technological progress, with more and more product types, richer functions and better performance. For example, in addition to traditional headphones, current audio devices have also seen the emergence of more types of headphones such as TWS (True Wireless Stereo earphones), OWS (Open-Back Stereo earphones), bone conduction headphones, and more. These newly emerging types of headphones have different advantages over traditional headphones. For example, OWS headphones have the advantages of being comfortable to wear and having rich sound details. However, TWS headphones do not fit completely with the user's ear canal when worn, and the gap between the two will cause the sound played by the headphones to leak into the environment. If there is privacy information in the sound, it will lead to privacy leakage.

[0038] The present invention provides an open-type earphone, which can be a TWS earphone, an accessory Figure 1The OWS earphone shown in the figure, and the like. As the name implies, the open earphone can be worn on the user's ear, and the open earphone can output sound waves into the user's ear canal when worn on the user's ear, that is, play audio. When the open earphone is worn on the user's ear, if there is a gap between the open earphone and the user's ear canal and pinna, it will cause sound leakage.

[0039] Please refer to the attached Figure 2 , which shows the structure of the open earphone, which only shows the position and connection relationship between the structures in the open earphone, and does not contain product structure, form, etc., that is, the attached figure does not limit the product structure, form, etc. For example, the structure, form, etc. of the open earphone can be adapted to the ergonomics of the user's wearing part.

[0040] As shown in the attached Figure 2 , the open earphone includes a housing and a first sound emitting unit. The first end of the housing is provided with a mounting cavity for mounting the first sound emitting unit, and the second end of the housing is provided with a battery compartment for mounting a battery; the connection structure between the first end and the second end is at least partially arc-shaped and at least partially includes an elastic material, which changes the relative position of the first end and the second end under the action of external force; it should be understood that the elastic material can maintain the natural state of the housing without receiving external force, that is, the relative position of the first end and the second end can remain unchanged, and the elastic material also has the ability to deform, that is, it can change shape under the action of external force and thus change the relative position of the first end and the second end to adapt to its use state, such as being in a clamping state to be worn on the user's ear, being in a retracted state to fit into the storage space of the earphone box, etc.

[0041] For example, the first end of the housing includes a front wall, a rear wall, and side walls connected to the front wall and the rear wall, respectively, and the front wall, the rear wall, and the side walls form a closed space, which is the mounting cavity in the housing. The first end is provided with a front sound cavity and a rear sound cavity of the first sound emitting unit. Optionally, the first sound emitting unit is arranged in the mounting cavity to divide the mounting cavity into a front sound cavity and a rear sound cavity, for example, the space between the first sound emitting unit and the front wall of the housing forms a front sound cavity, and the space between the first sound emitting unit and the rear wall of the housing forms a rear sound cavity. The first sound emitting unit is used to output sound waves, for example, it can be a loudspeaker unit, which can decode the sound source signal, convert the digital signal to the analog signal, and output the sound waves according to the processed sound source signal, that is, play the sound source signal.

[0042] The shell is provided with a main sound outlet hole communicating with the front sound cavity, which is located outside the user's ear canal in the wearing state and substantially faces the user's ear to output the first sound wave in the sound wave (i.e. the sound wave output by the first sound generating unit) to the user's ear canal; for example, the front wall of the shell faces the user's ear canal in the wearing state, and the main sound outlet hole is preferably arranged on the front wall of the shell to facilitate the transmission of the first sound wave into the user's ear canal. It should be understood that the present disclosure does not limit the number of main sound outlet holes; moreover, the main sound outlet hole is ideally directed towards the user's ear canal and has the best effect, but it is not necessarily completely directed towards the user's ear in each user's wearing state due to individual ear differences, etc., i.e. it is substantially directed towards the user's ear. For example, the front wall of the first end is a sound wave conducting material to facilitate the transmission of the sound wave output by the first sound generating unit to the outside of the shell and into the ear canal directed by the front wall; the rear wall and the side wall of the first end are sound wave shielding materials to avoid leakage of the sound wave output by the first sound generating unit. For another example, the first sound generating unit is arranged in the mounting cavity close to the front wall to facilitate the transmission of the sound wave output by the first sound generating unit to the user's ear canal through the main sound outlet hole on the front wall. It should be understood that there is a gap between the first sound generating unit and the front wall and the rear wall to ensure its vibration space, and its vibration direction can be front-back direction, and the sound wave transmission direction is front and back, i.e. it can transmit sound waves with the same amplitude and opposite phase forward and backward.

[0043] The shell has a gap with the user's ear canal, auricle and other body structures in the wearing state, so that part of the first sound wave output by the main sound outlet hole enters the user's ear canal, and part of it leaks directly or through reflection through the gap between the shell and the user's ear canal and auricle, forming a leakage sound wave. That is, the leakage sound wave is the sound wave in the first sound wave that leaks into the environment, such as the sound wave that does not enter the ear canal or the sound wave that enters the ear canal and is reflected out.

[0044] The shell is provided with a sub sound hole in communication with the rear sound cavity, the sub sound hole is different from the main sound hole in orientation, for example, the sub sound hole is provided on the rear wall and / or the side wall of the first end, preferably on the side wall. The number of sub sound holes is not limited in the present disclosure, preferably, the sub sound holes are uniformly distributed on the side wall of the first end, for example, the sub sound holes are symmetrically arranged on the rear wall and / or the side wall of the first end (i.e. symmetric about the axis center of the shell, the axis of the shell is the axial centerline of the side wall of the shell). The leaked sound waves will be transmitted to the outside of the side wall of the first end, even the outside of the rear wall of the first end after leakage; the sub sound hole is used to output the second sound wave in the sound wave (i.e. the sound wave output by the first sound generating unit), because the orientation of the sub sound hole is different from that of the main sound hole, the phase of the second sound wave output in the sub sound hole is different from, even opposite to, the leaked sound wave (the leaked sound wave is formed by the leakage of the first sound wave), therefore, when the leaked sound wave meets the second sound wave output by the sub sound hole, the second sound wave output by the sub sound hole will suppress, even eliminate, the leaked sound wave, i.e. used to offset at least part of the leaked sound wave, thereby avoiding the leakage of private information in the leaked sound wave.

[0045] Next, the effect of the open earphone provided in the embodiment will be described in detail in combination with the principle of sound wave cancellation and suppression.

[0046] Two different sound waves superimposed together will cause sound interference, and the sound will change.

[0047] Suppose two sound waves are P1 and P2, the amplitude is P 1a , P 2a , the frequency is w, the phase is α1 and α2, and the time is t.

[0048] P1=P 1a cos(wt-α1)

[0049] P2=P 2a cos(wt-α2)

[0050] The average sound energy density E1 and E2 can be obtained by the amplitude:

[0051] E1=P 1a ^2 / 2ρ0c0 ^2

[0052] E2=P 1a ^2 / 2ρ0c0 ^2

[0053] Where 2ρ0c0 ^2 is a constant, ρ0 is air density, and c0 is sound speed.

[0054] The synthetic sound energy density E has:

[0055] E = E1 + E2 + P 1a P 2a cos α / ρ0c0 ^2

[0056] Wherein, α is the phase difference of the two sound waves.

[0057] As can be seen from the above formula, the sound energy density of the synthetic sound wave is mainly related to the phase difference of the two waves. When the amplitudes of the two waves are the same and the phases are opposite, the sound waves will cancel each other out.

[0058] The open earphone provided by the embodiments of the present disclosure can output the sound waves output by the first sound generating unit in the installation cavity as first sound waves through the main sound outlet hole communicating with the front sound cavity, and the first sound waves are used to transmit to the user's ear canal, and at the same time inevitably leak through the gap between the shell and the ear canal to form a leaked sound wave. The sound waves output by the first sound generating unit can also be output as second sound waves through the auxiliary sound outlet hole communicating with the rear sound cavity. Since the directions of the front and rear sound cavities are opposite, the phase difference between the leaked sound wave and the second sound wave output by the auxiliary sound outlet hole is about 180°. Therefore, the second sound wave output by the auxiliary sound outlet hole can suppress or even eliminate the leaked sound wave, that is, can cancel out the leaked sound wave, thereby avoiding the leakage of private information in the leaked sound wave.

[0059] In some embodiments of the present disclosure, the device further comprises a second sound generating unit arranged in the rear sound cavity, for example, the second sound generating unit comprises a loudspeaker unit. Please refer to FIG. 2, Figure 3 which exemplarily shows a structural schematic diagram of an open earphone provided with a second sound generating unit, which only shows the positions and connection relationships between the structures in the open earphone, and does not include product structures, forms, etc., that is, the drawings do not limit the product structures, forms, etc. For example, the structure and form of the open earphone can be adapted to the ergonomics of the user's wearing part.

[0060] As shown in FIG. 2, Figure 3 the second sound generating unit can be arranged in the rear sound cavity away from the first sound generating unit, for example, arranged at a position close to the rear wall of the first end, so as to avoid mutual interference between the two sound generating units. Preferably, the second sound generating unit is arranged in parallel with the first sound generating unit. It should be understood that there is a gap between the second sound generating unit and the front wall and the rear wall of the shell to ensure the vibration space thereof, and the vibration direction thereof can be the front-back direction, and the sound wave transmission direction is the front direction and the rear direction, that is, the sound waves with the same amplitude and opposite phases can be transmitted forward and backward.

[0061] Preferably, the second sound generating unit is configured to output a third sound wave to at least the auxiliary sound outlet, so as to cancel the leaked sound wave formed by the sound wave output by the first sound generating unit.

[0062] Preferably, the equalization processor of the first sound generating unit and the equalization processor of the second sound generating unit are configured to process the sound source signal respectively, so that the leaked sound wave and the third sound wave (i.e. Figure 3 part of the interference sound wave in the leaked sound wave and the third sound wave) satisfy at least one of the following conditions: the phase and the amplitude of the leaked sound wave and the third sound wave in a preset frequency band satisfy a mutual cancellation condition, for example, the phase is opposite and the amplitude is the same; the phase and the amplitude of the leaked sound wave and the third sound wave in a preset direction satisfy a mutual cancellation condition, for example, the phase is opposite and the amplitude is the same.

[0063] When the leaked sound wave is transmitted in the gap between the shell and the ear canal and the auricle of the user, the path is narrow, small and winding, which will cause the phase and the amplitude of the leaked sound wave to be affected and deviate from the phase and the amplitude of the original sound wave emitted by the first sound generating unit, especially in some frequency bands (for example, high frequency).

[0064] Because the amplitude and the phase of the leaked sound wave are different in different frequency bands and different directions of the user, the critical frequency band (i.e. the preset frequency band) and the direction (i.e. the preset direction) can be selected for the suppression and cancellation of the leaked sound wave. That is, after the equalization processor of the first sound generating unit is configured, the leaked sound wave formed by the sound wave emitted by the first sound generating unit in the earphone wearing state can be simulated, and the transfer function of the leaked sound wave in different frequency bands and the transfer function of the leaked sound wave in different directions of the user can be detected, wherein the direction of the user can be the direction indicated by the angle as shown in FIG. 10. Figure 4 Further, the equalization processor of the second sound generating unit is configured based on the transfer function of the leaked sound wave in the preset frequency band and / or the preset direction, so that in the case of the same sound source signal, the phase and the amplitude of the leaked sound wave formed by the sound wave output by the first sound generating unit in the preset frequency band and / or the preset direction and the third sound wave output by the second sound generating unit satisfy a mutual cancellation condition, which enables the third sound wave output by the second sound generating unit to suppress and even cancel the leaked sound wave in the preset frequency band and / or the preset direction.

[0065] Preferably, the preset frequency band can be a frequency band corresponding to a voice call sound wave, because there is more private information in the voice call sound wave, and it is necessary to avoid leakage. Alternatively, the preset frequency band can be a frequency band with the largest loudness among multiple frequency bands, because the frequency band with the largest loudness has a higher possibility of being heard by others, and it is necessary to avoid leakage.

[0066] The preset direction can be configured according to actual needs. For example, the side of the user is easy to have other people, and therefore the preset direction can be set to the side of the user. Figure 4 The directions represented by 90° and -90° are shown.

[0067] Preferably, the open earphone further comprises an audio control port for outputting an electric signal, and an inverting unit electrically connected between the audio control port and the second sound generating unit, for inverting the electric signal and outputting the inverted electric signal to the second sound generating unit, so that the second sound generating unit can generate the third sound wave; wherein the first sound generating unit is electrically connected to the audio control port, for generating the first sound wave and the second sound wave based on the electric signal.

[0068] That is, the first sound generating unit directly generates sound waves based on the electric signal output by the audio control port, and forms the first sound wave when output through the main sound outlet and forms the second sound wave when output through the auxiliary sound outlet; and the second sound generating unit generates the third sound wave based on the inverted electric signal output by the inverting unit, so that the third sound wave is inverted with the leaked sound wave formed by the first sound wave.

[0069] Illustratively, the open earphone further comprises a first switching unit electrically connected between the audio control port and the first sound generating unit, for digital-to-analog switching of the electric signal output by the audio control port to obtain a first analog signal. The electric signal is completed digital-to-analog switching through the first switching unit, so as to facilitate the first sound generating unit to generate sound waves based on the analog signal.

[0070] Illustratively, the open earphone further comprises a second switching unit electrically connected between the inverting unit and the second sound generating unit, for digital-to-analog switching of the inverted electric signal output by the inverting unit to obtain a second analog signal. The electric signal is completed digital-to-analog switching through the first switching unit, so as to facilitate the second sound generating unit to generate sound waves based on the analog signal.

[0071] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses or adaptive changes of this disclosure that follow, in general, the principles of the disclosure and include known equivalents or substitutions without departing from the scope of the disclosure. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the disclosure are indicated by the following claims.

[0072] It should be understood that the present disclosure is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the claims that follow.

Claims

1. An open earphone, characterized by, The open earphone comprises: a shell, a mounting cavity is arranged in a first end of the shell, and a first sound generating unit is mounted in the mounting cavity; a battery compartment is arranged in a second end of the shell, and a battery is mounted in the battery compartment; a connecting structure between the first end and the second end is at least partially arc-shaped, and at least partially comprises an elastic material, and the elastic material changes the relative positions of the first end and the second end under an external force; a front sound cavity and a rear sound cavity of the first sound generating unit are arranged in the first end, the shell is provided with a main sound outlet hole communicating with the front sound cavity and a secondary sound outlet hole communicating with the rear sound cavity, the main sound outlet hole is located outside an ear canal of a user and substantially faces an ear of the user in a wearing state, and the secondary sound outlet hole is different from the main sound outlet hole in orientation; wherein the first sound generating unit is configured to output sound waves, the main sound outlet hole is configured to output first sound waves in the sound waves, and the secondary sound outlet hole is configured to output second sound waves in the sound waves, and the second sound waves are configured to cancel at least part of leaked sound waves, and the leaked sound waves comprise sound waves leaked from the first sound waves to the environment.

2. Open earphone according to claim 1, characterized in that The open earphone further comprises a second sound generating unit arranged in the rear sound cavity, the second sound generating unit has the same sound source signal as the first sound generating unit, and the second sound generating unit is configured to output third sound waves at least towards the secondary sound outlet hole, and the third sound waves and the second sound waves jointly cancel at least part of the leaked sound waves.

3. Open earphone according to claim 2, characterized in that The second sound generating unit has the same sound source signal as the first sound generating unit.

4. The open headphone of claim 2, wherein, The leaked sound waves and the third sound waves satisfy at least one of the following conditions: the leaked sound waves and the third sound waves satisfy a mutual cancellation condition in a preset frequency band in terms of phase and amplitude; the leaked sound waves and the third sound waves satisfy a mutual cancellation condition in a preset direction in terms of phase and amplitude.

5. The open headphone of claim 4, wherein, The open earphone further comprises: an audio control port configured to output an electrical signal; an inverting unit electrically connected between the audio control port and the second sound generating unit, configured to invert the electrical signal and output the inverted electrical signal to the second sound generating unit, so that the second sound generating unit can generate the third sound waves; wherein the first sound generating unit is electrically connected to the audio control port and is configured to generate the first sound waves and second sound waves based on the electrical signal.

6. The open headphone of claim 5, wherein, The open earphone further comprises: a first switching unit electrically connected between the audio control port and the first sound generating unit, configured to perform digital-to-analog conversion on the electrical signal output by the audio control port to obtain a first analog signal; a second switching unit electrically connected between the inverting unit and the second sound generating unit, configured to perform digital-to-analog conversion on the inverted electrical signal output by the inverting unit to obtain a second analog signal.

7. The open headphone of claim 4, wherein, The preset frequency band comprises a frequency band corresponding to a voice call sound wave, or a frequency band with the maximum loudness in a plurality of frequency bands.

8. The open headphone of claim 2, wherein, The second sound generating unit is arranged in the rear sound cavity away from the first sound generating unit.

9. The open headphone of claim 2, wherein, The first sound generating unit comprises a loudspeaker unit; and / or, the second sound generating unit comprises a loudspeaker unit.

10. The open headphone of claim 1, wherein, The first end comprises a front wall, a back wall, and side walls connected to the front wall and the back wall respectively; the main sound outlet is arranged on the front wall, and the auxiliary sound outlets are symmetrically arranged on the back wall and / or the side walls.

11. The open headphone of claim 10, wherein, The first sound production unit is arranged in the mounting cavity close to the front wall.

12. The open headphone of claim 10, wherein, The front wall of the shell is made of sound wave conducting material, and the back wall and the side walls are made of sound wave shielding material.

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