Sound output device

Abstract

The present application discloses a sound output device. The sound output device includes: a vibration speaker configured to generate bone-conducted sound waves; and an air-conducted speaker configured to generate air-conducted sound waves. The sound output device is configured to output sound waves within a target frequency range, wherein the bone-conducted sound waves include the high-frequency portion of the target frequency range, and the air-conducted sound waves include the low-frequency portion of the target frequency range.

Description

Technical Field

[0001] The present application relates to the field of acoustics, and in particular to a sound output device. Background Art

[0002] Nowadays, wearable devices with acoustic output functions are constantly emerging and becoming popular. In particular, a way of listening with open ears (that is, without inserting acoustic devices into the ears or covering the ears) is increasingly being used in wearable devices because of its health and safety characteristics. This open-ear listening method can be achieved through air conduction or bone conduction. However, the air conduction method requires larger acoustic devices and structures, and will also cause more obvious sound leakage. The bone conduction method will produce stronger low-frequency vibrations, and will often cause a certain amount of sound leakage. These problems have a negative impact on the experience of this open-ear listening method, limiting the application of this method.

[0003] Therefore, it is necessary to provide a sound output device that improves the open-ear listening effect and the problem of sound leakage. Summary of the Invention

[0004] A brief overview of the present application is provided below to provide a basic understanding of certain aspects of the present application. It should be understood that this section is not intended to identify key or important portions of the present application, nor is it intended to limit the scope of the present application. Its purpose is simply to present certain concepts in a simplified form as a prelude to a more detailed description that will be discussed later.

[0005] The present application provides a sound output device that can generate and output bone conduction (abbreviated as "bone conduction") sound waves and air conduction (abbreviated as "air conduction") sound waves. It achieves various combinations of auditory and tactile stimulation by adjusting the acoustic characteristics (for example, phase, amplitude, and frequency band) of bone conduction sound waves and air conduction sound waves to improve listening effects and solve the problem of sound leakage, thereby enhancing the user experience.

[0006] One aspect of the present application provides a sound output device, which includes a vibration speaker configured to generate bone-conducted sound waves and an air-conducted speaker configured to generate air-conducted sound waves.

[0007] According to some embodiments of the present application, the sound output device is configured to output sound waves within a target frequency range, the bone-conducted sound waves include the high-frequency part of the target frequency range, and the air-conducted sound waves include the low-frequency part of the target frequency range.

[0008] According to some embodiments of the present application, the vibration speaker is further configured to generate low-frequency vibration waves that can be felt by the user's skin.

[0009] According to some embodiments of the present application, the bone-conducted sound wave includes a mid-frequency portion in the target frequency range, and the air-conducted sound wave includes a mid-frequency portion in the target frequency range.

[0010] According to some embodiments of the present application, the bone-conducted sound waves include the low-frequency part of the target frequency range, and the bone-conducted sound waves are superimposed on the air-conducted sound waves, so that the output of the sound output device at medium and low frequencies is greater than its output at medium and high frequencies.

[0011] According to some embodiments of the present application, the air-conducted sound wave includes a mid-frequency part in the target frequency range, the bone-conducted sound wave includes a low-frequency part and a mid-frequency part in the target frequency range, and the bone-conducted sound wave covers a wider frequency range than the air-conducted sound wave.

[0012] According to some embodiments of the present application, the air-conducted sound waves include a mid-frequency part and a high-frequency part in the target frequency range, and the bone-conducted sound waves include a mid-frequency part in the target frequency range. The air-conducted sound waves cover a wider frequency range than the bone-conducted sound waves.

[0013] According to some embodiments of the present application, the air-conducted sound waves and the bone-conducted sound waves include common sound-absorbing frequency sound waves.

[0014] According to some embodiments of the present application, the vibration speaker is coupled to the air conduction speaker through a mechanical structure, and the bone conduction sound waves are at least partially input into the air conduction speaker as an input signal.

[0015] According to some embodiments of the present application, the sound output device also includes: a signal processing module configured to generate a control signal, wherein the vibration speaker includes a vibration component, the vibration component is electrically connected to the signal processing module to receive the control signal, and generates the bone conduction sound wave based on the control signal, and the air conduction speaker includes a shell, the shell is coupled to the vibration component and generates the air conduction sound wave based on the bone conduction sound wave.

[0016] According to some embodiments of the present application, the connection between the shell and the vibration component is a rigid connection.

[0017] According to some embodiments of the present application, the shell is connected to the vibration component through an elastic member.

[0018] According to some embodiments of the present application, the sound output device is an earphone, wherein the earphone has a quadrilateral structure.

[0019] According to some embodiments of the present application, the shell includes a sound outlet hole, wherein the air-conducted sound waves are output from the inside of the shell to the outside of the shell through the sound outlet hole.

[0020] According to some embodiments of the present application, the air conduction speaker includes a tuning mesh, which covers the sound outlet to adjust the frequency of the air conduction sound waves.

[0021] According to some embodiments of the present application, the sound output device is a headset.

[0022] According to some embodiments of the present application, the sound outlet is oriented so as to face away from the temple when the sound output device is located at the user's temple.

[0023] According to some embodiments of the present application, the sound outlet is oriented toward the external auditory canal of the user when the sound output device is located at the user's temple.

[0024] According to some embodiments of the present application, the sound outlet is oriented toward behind the ear of the user when the sound output device is located at the user's temple.

[0025] According to some embodiments of the present application, the sound outlet is oriented toward the top of the user's head when the sound output device is located at the user's temple.

[0026] According to some embodiments of the present application, the sound output device also includes: a signal processing module configured to generate a control signal, wherein the vibration speaker includes a vibration component, the vibration component is electrically connected to the signal processing module to receive the control signal, and generates the bone-conducted sound wave based on the control signal, wherein the air-conducted speaker includes a shell, the shell is coupled to the vibration component, and generates the air-conducted sound wave under the action of the vibration component.

[0027] According to some embodiments of the present application, the vibration component includes: a magnetic circuit system configured to generate a first magnetic field; a vibration plate connected to the shell; and a coil connected to the vibration plate and electrically connected to the signal processing module, the coil receiving the control signal and generating a second magnetic field based on the control signal, the first magnetic field interacting with the second magnetic field so that the vibration plate generates the bone-conducted sound waves.

[0028] According to some embodiments of the present application, the air-conduction speaker further includes a diaphragm, which is connected to the magnetic circuit system and the shell, and the first magnetic field interacts with the second magnetic field so that the diaphragm generates the air-conducted sound waves.

[0029] According to some embodiments of the present application, the vibration plate and the shell define a cavity, and the magnetic circuit system and the vibration membrane are located in the cavity.

[0030] According to some embodiments of the present application, the shell includes a tuning hole, and the air conduction speaker includes a tuning mesh, and the tuning mesh covers the tuning hole.

[0031] According to some embodiments of the present application, the vibration plate includes a sound outlet hole, wherein the air-conducted sound waves are output from the inside of the shell to the outside of the shell through the sound outlet hole.

[0032] According to some embodiments of the present application, the air conduction speaker includes a tuning mesh covering the sound outlet.

[0033] According to some embodiments of the present application, the shell includes a sound outlet hole, wherein the air-conducted sound waves are output from the inside of the shell to the outside of the shell through the sound outlet hole.

[0034] According to some embodiments of the present application, the air conduction speaker includes a tuning mesh covering the sound outlet.

[0035] According to some embodiments of the present application, the magnetic circuit system is connected to the shell through a first elastic member.

[0036] According to some embodiments of the present application, the magnetic circuit system is connected to the vibration plate through a first elastic member, and the vibration plate is connected to the shell through a second elastic member.

[0037] According to some embodiments of the present application, the vibration component includes: a magnetic circuit system, configured to generate a first magnetic field; and a vibration plate, connected to the shell through an elastic member, wherein the air conduction speaker also includes: a diaphragm, connected to the shell; and a coil, connected to the diaphragm and electrically connected to the signal processing module, the coil receives the control signal and generates a second magnetic field based on the control signal, the first magnetic field interacts with the second magnetic field to cause the vibration plate to generate the bone conduction sound wave and the diaphragm to generate the air conduction sound wave.

[0038] According to some embodiments of the present application, the air conduction speaker includes a sound guide tube, which is connected to the sound outlet hole.

[0039] According to some embodiments of the present application, the sound guide tube is configured such that a phase of the air-conducted sound wave is opposite to a phase of sound leakage from the vibration plate.

[0040] According to some embodiments of the present application, the shell includes a tuning hole, and the air conduction speaker includes a sound guide tube, which is connected to the tuning hole.

[0041] According to some embodiments of the present application, the shell includes a tuning hole, and the air conduction speaker includes a passive diaphragm, which is connected in the tuning hole and is configured to vibrate under the action of the air conduction sound waves to generate air conduction sound waves.

[0042] According to some embodiments of the present application, the signal processing module includes: a bone conduction signal processing circuit, configured to generate a bone conduction control signal; and an air conduction signal processing circuit, configured to generate an air conduction control signal; the vibration speaker includes: a first vibration component, the first vibration component is electrically connected to the bone conduction signal processing circuit to receive the bone conduction control signal, and generates the bone conduction sound wave based on the bone conduction control signal; the air conduction speaker includes: a second vibration component, the second vibration component is electrically connected to the air conduction signal processing circuit to receive the air conduction control signal, and generates the air conduction sound wave based on the air conduction control signal.

[0043] According to some embodiments of the present application, the first vibration component includes: a magnetic circuit system, configured to generate a first magnetic field; a vibration plate, connected to the shell through an elastic member; and a first coil, connected to the vibration plate and electrically connected to the bone conduction signal processing circuit, the first coil receives the bone conduction control signal and generates a second magnetic field based on the bone conduction control signal, the first magnetic field interacts with the second magnetic field so that the vibration plate generates the bone conduction sound wave; the second vibration component includes: a diaphragm, connected to the shell; and a second coil, connected to the diaphragm and electrically connected to the air conduction signal processing circuit, the second coil receives the air conduction control signal and generates a third magnetic field based on the air conduction control signal, the first magnetic field interacts with the third magnetic field so that the diaphragm generates the air conduction sound wave.

[0044] According to some embodiments of the present application, the magnetic circuit system is connected to the housing via an elastic member.

[0045] According to some embodiments of the present application, the shell includes a sound outlet hole and a tuning hole, and the air conduction speaker has a first tuning mesh and a second tuning mesh, the first tuning mesh covers the sound outlet hole, and the second tuning mesh covers the tuning hole.

[0046] According to some embodiments of the present application, the bone conduction signal processing circuit includes a full-frequency signal processing module, which is configured to generate a bone conduction output signal based on the initial acoustic signal; the air conduction signal processing circuit includes: a frequency division module, which is configured to decompose the initial acoustic signal into a high-frequency component and a low-frequency signal component; a high-frequency signal processing module, which is coupled to the frequency division module and configured to generate a high-frequency output signal based on the high-frequency signal component; and a low-frequency signal processing module, which is coupled to the frequency division module and configured to generate a low-frequency output signal based on the low-frequency signal component.

[0047] According to some embodiments of the present application, the bone conduction signal processing circuit includes a first power amplifier, which is configured to amplify the bone conduction output signal into the bone conduction control signal; the air conduction signal processing circuit includes: a second power amplifier, which is configured to amplify the high-frequency output signal into a high-frequency air conduction control signal; and a third power amplifier, which is configured to amplify the low-frequency output signal into a low-frequency air conduction control signal.

[0048] According to some embodiments of the present application, the air conduction speaker includes: a high-frequency air conduction speaker, configured to generate high-frequency air conduction sound waves based on the high-frequency control signal; and a low-frequency air conduction speaker, configured to generate low-frequency air conduction sound waves based on the low-frequency control signal.

[0049] According to some embodiments of the present application, the air conduction signal processing circuit includes a signal synthesis module, which is coupled to the high-frequency signal processing module and the low-frequency signal processing module and is configured to synthesize the high-frequency output signal and the low-frequency output signal into an air conduction output signal.

[0050] According to some embodiments of the present application, the bone conduction signal processing circuit includes a first power amplifier, which is configured to amplify the bone conduction output signal into the bone conduction control signal, and the air conduction signal processing circuit includes a second power amplifier, which is configured to amplify the air conduction output signal into the air conduction control signal.

[0051] According to some embodiments of the present application, the signal processing module further includes: a microphone configured to collect an ambient noise signal; and a noise signal processing module coupled to the microphone and the air conduction signal processing circuit and configured to reduce noise on the air conduction output signal based on the ambient noise signal.

[0052] According to some embodiments of the present application, the signal processing module also includes: a first microphone, configured to collect an ambient noise signal; a noise signal processing module, coupled to the first microphone and configured to generate a noise reduction signal based on the ambient noise signal; and a fourth power amplifier, coupled to the noise signal processing module and configured to amplify the noise reduction signal. The air conduction speaker also includes: an auxiliary air conduction speaker, coupled to the fourth power amplifier and configured to output air conduction sound waves based on the amplified noise reduction signal.

[0053] According to some embodiments of the present application, the signal processing module further includes: a microphone, configured to collect sound signals from the area to be noise reduced and generate an error signal based on the sound signals; and a noise signal processing module, coupled to the microphone and the air conduction signal processing circuit, and configured to generate a feedback signal based on the error signal, wherein the feedback signal is used to reduce noise on the air conduction output signal.

[0054] According to some embodiments of the present application, the signal processing module further includes: a second microphone, configured to collect sound signals from the area to be noise reduced and generate an error signal based on the sound signals; and a noise signal feedback module, coupled to the second microphone and the noise signal processing module, and configured to generate a feedback signal based on the error signal, wherein the noise signal processing module is configured to generate a noise reduction signal based on the ambient noise signal and the feedback signal.

[0055] According to some embodiments of the present application, the signal processing module further includes: a sub-band decomposition module, configured to decompose the initial acoustic signal into multiple signal components, and the multiple signal components are respectively located in different sub-frequency bands; a vibration signal processing module, configured to generate multiple bone conduction output signals based on the multiple signal components, and the multiple bone conduction output signals are respectively located in the different frequency bands; and a sound signal processing module, configured to generate multiple air conduction output signals based on the multiple signal components, and the multiple air conduction output signals are respectively located in the different frequency bands; multiple first power amplifiers, coupled to the vibration signal processing module and configured to amplify the multiple bone conduction output signals into bone conduction control signals of corresponding frequency bands; and multiple second power amplifiers, coupled to the sound signal processing module and configured to amplify the multiple air conduction output signals into air conduction control signals of corresponding frequency bands.

[0056] According to some embodiments of the present application, the sound output device also includes: a plurality of vibration speakers, which are coupled one-to-one with the plurality of first power amplifiers and generate bone-conducted sound waves of corresponding frequency bands based on the bone conduction control signals of the corresponding frequency bands; and a plurality of air conduction speakers, which are coupled one-to-one with the plurality of second power amplifiers and generate air-conducted sound waves of corresponding frequency bands based on the air conduction control signals of the corresponding frequency bands.

[0057] Another aspect of the present application provides a sound output device, which includes: a signal processing module configured to generate a control signal; a shell; a magnetic circuit system configured to generate a first magnetic field; a vibration plate connected to the shell; a coil connected to the vibration plate and electrically connected to the signal processing module, the coil receiving the control signal and generating a second magnetic field based on the control signal, the first magnetic field interacting with the second magnetic field so that the vibration plate generates bone-conducted sound waves; a diaphragm, the diaphragm being connected to the magnetic circuit system and the shell, the first magnetic field interacting with the second magnetic field so that the diaphragm generates air-conducted sound waves.

[0058] According to some embodiments of the present application, the vibration plate and the shell define a cavity, and the magnetic circuit system and the vibration membrane are located in the cavity.

[0059] According to some embodiments of the present application, the shell includes a sound outlet hole and a tuning hole, and the sound output device includes a first tuning net and a second tuning net, the first tuning net covers the sound outlet hole, and the second tuning net covers the tuning hole.

[0060] According to some embodiments of the present application, the sound output device further includes: an elastic member connecting the magnetic circuit system to the housing.

[0061] According to some embodiments of the present application, the sound output device further includes: a first elastic member connecting the magnetic circuit system to the vibration plate; and a second elastic member connecting the vibration plate to the housing.

[0062] Another aspect of the present application provides a sound output device, which includes: a signal processing module configured to generate a control signal; a shell; a magnetic circuit system configured to generate a first magnetic field; a vibration plate connected to the magnetic circuit system; a diaphragm connected to the shell; a coil connected to the diaphragm and electrically connected to the signal processing module, the coil receiving the control signal and generating a second magnetic field based on the control signal, the first magnetic field interacting with the second magnetic field to cause the vibration plate to generate bone-conducted sound waves and the diaphragm to generate air-conducted sound waves.

[0063] According to some embodiments of the present application, the vibration plate and the shell define a cavity, and the magnetic circuit system, the vibration membrane and the coil are located in the cavity.

[0064] According to some embodiments of the present application, the shell includes a sound outlet hole and a tuning hole, and the sound output device includes a first tuning net and a second tuning net, the first tuning net covers the sound outlet hole, and the second tuning net covers the tuning hole.

[0065] Yet another aspect of the present application provides a sound output device, comprising: a bone conduction signal processing module configured to generate a bone conduction control signal; an air conduction signal processing module configured to generate an air conduction control signal; a housing; a magnetic circuit system configured to generate a first magnetic field; a vibration plate connected to the housing; a first coil connected to the vibration plate and electrically connected to the bone conduction signal processing module, the first coil receiving the bone conduction control signal and generating a second magnetic field based on the bone conduction control signal, the first magnetic field interacting with the second magnetic field to cause the vibration plate to generate the bone conduction sound wave; a diaphragm connected to the housing; and a second coil connected to the diaphragm and electrically connected to the air conduction signal processing module, the second coil receiving the air conduction control signal and generating a third magnetic field based on the air conduction control signal, the first magnetic field interacting with the third magnetic field to cause the diaphragm to generate the air conduction sound wave.

[0066] According to some embodiments of the present application, the vibration plate and the shell define a cavity, and the magnetic circuit system and the vibration membrane are located in the cavity.

[0067] According to some embodiments of the present application, the shell includes a sound outlet hole and a tuning hole, and the sound output device includes a first tuning net and a second tuning net, the first tuning net covers the sound outlet hole, and the second tuning net covers the tuning hole.

[0068] According to some embodiments of the present application, the sound output device further includes: an elastic member connecting the magnetic circuit system to the housing.

[0069] The sound output device of the present application can improve the listening effect and sound leakage problems of traditional sound output devices, thereby enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] The present application can be better understood by referring to the following description in conjunction with the accompanying drawings, in which the same or similar reference numerals are used throughout the drawings to represent the same or similar components. In the drawings:

[0071] Figure 1 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown;

[0072] Figure 2 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown;

[0073] Figure 3 A schematic diagram of a sound output device according to an embodiment of the present application is shown;

[0074] Figure 4 A schematic diagram of a sound output device according to an embodiment of the present application is shown;

[0075] Figure 5 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown;

[0076] Figure 6 A schematic diagram of a sound output device according to an embodiment of the present application is shown;

[0077] Figure 7 A schematic diagram of a sound output device according to an embodiment of the present application is shown;

[0078] Figure 8 shows a structural diagram of a sound output device provided according to an embodiment of the present application;

[0079] Figure 9 shows a structural diagram of a sound output device provided according to an embodiment of the present application;

[0080] Figure 10 A schematic diagram of a resonance system provided according to an embodiment of the present application is shown;

[0081] Figure 11 A schematic diagram showing the same driving force driving two resonant systems;

[0082] Figure 12 It shows the amplitude-frequency characteristics of two different resonant systems when driven by the same driving force;

[0083] Figure 13 It shows the phase-frequency characteristics of two different resonant systems driven by the same driving force;

[0084] Figure 14 A schematic diagram showing a pair of opposing driving forces driving two resonant systems;

[0085] Figure 15 It shows the amplitude-frequency characteristics of two different resonant systems when driven by the same driving force;

[0086] Figure 16 It shows the phase-frequency characteristics of two different resonant systems driven by the same driving force;

[0087] Figure 17A schematic diagram showing two resonant systems driven by different driving forces;

[0088] Figure 18 It shows the amplitude-frequency characteristics of two different resonant systems when driven by the same driving force;

[0089] Figure 19 It shows the amplitude-frequency characteristics of two different resonant systems when driven by the same driving force;

[0090] Figure 20 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown;

[0091] Figure 21 The figure shows the amplitude-frequency characteristics of bone-conducted sound waves and air-conducted sound waves provided according to the embodiments of the present application;

[0092] Figure 22 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown;

[0093] Figure 23 A schematic diagram showing different positions of the sound outlet;

[0094] Figure 24 The amplitude-frequency characteristics of air-conducted sound waves at different sound outlet positions are shown;

[0095] Figure 25 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown;

[0096] Figure 26 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown;

[0097] Figure 27 The amplitude-frequency characteristics of bone-conducted sound waves and air-conducted sound waves are shown;

[0098] Figure 28 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown;

[0099] Figure 29 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown;

[0100] Figure 30 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown;

[0101] Figure 31 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown;

[0102] Figure 32 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown;

[0103] Figure 33 A schematic diagram of a sound output device according to an embodiment of the present application is shown;

[0104] Figure 34 A schematic diagram of a sound output device according to an embodiment of the present application is shown;

[0105] Figure 35 shows the amplitude-frequency characteristics of the sound output device provided according to an embodiment of the present application;

[0106] Figure 36 shows the amplitude-frequency characteristics of the sound output device provided according to an embodiment of the present application;

[0107] Figure 37 shows the amplitude-frequency characteristics of the sound output device provided according to an embodiment of the present application;

[0108] Figure 38 shows the amplitude-frequency characteristics of the sound output device provided according to an embodiment of the present application;

[0109] Figure 39 The figure shows the amplitude-frequency characteristics of the sound when the sound output module provided by the embodiment of the present application is at different positions on the head;

[0110] Figure 40 The figure shows the amplitude-frequency characteristics of sound leakage of the sound output module provided in accordance with an embodiment of the present application;

[0111] Figure 41 The figure shows the amplitude-frequency characteristics of sound leakage of the vibration output module provided in accordance with an embodiment of the present application;

[0112] Figure 42 A schematic diagram showing the positional relationship of two dipole sound sources provided according to an embodiment of the present application is shown;

[0113] Figure 43 The figure shows the amplitude-frequency characteristics of two dipole sound sources at different spacings provided in accordance with an embodiment of the present application;

[0114] Figure 44 A schematic diagram showing the positional relationship of two dipole sound sources provided according to an embodiment of the present application is shown;

[0115] Figure 45 The figure shows the normal amplitude-frequency characteristics of two dipole sound sources provided in an embodiment of the present application at different amplitude ratios;

[0116] Figure 46 The figure shows the axial amplitude-frequency characteristics of two dipole sound sources provided in an embodiment of the present application at different amplitude ratios;

[0117] Figure 47A schematic diagram showing the positional relationship of two monopole sound sources provided according to an embodiment of the present application is shown;

[0118] Figure 48 The figure shows the amplitude-frequency characteristics of two monopole sound sources provided by an embodiment of the present application at different phase differences;

[0119] Figure 49 A schematic diagram showing the positional relationship of two dipole sound sources provided according to an embodiment of the present application is shown;

[0120] Figure 50 The figure shows the relationship between the normal angle and amplitude of two dipole sound sources at different frequencies provided by an embodiment of the present application;

[0121] Figure 51 The figure shows the relationship between the axial angle and amplitude of two dipole sound sources provided in an embodiment of the present application at different frequencies;

[0122] Figure 52 A schematic diagram showing the positional relationship of five monopole sound sources provided according to an embodiment of the present application is shown;

[0123] Figure 53 shows the amplitude distribution of five monopole sound sources at different frequencies provided according to an embodiment of the present application;

[0124] Figure 54 A schematic diagram showing the positional relationship of five monopole sound sources provided according to an embodiment of the present application is shown;

[0125] Figure 55 shows the amplitude distribution of five monopole sound sources at different phase differences provided according to an embodiment of the present application;

[0126] Figure 56 A schematic diagram showing the positional relationship of five monopole sound sources provided according to an embodiment of the present application is shown;

[0127] Figure 57 The figure shows the amplitude distribution of five monopole sound sources provided in an embodiment of the present application at different amplitude ratios;

[0128] Figure 58 Various combinations of bone-conducted sound waves and air-conducted sound waves provided in accordance with embodiments of the present application are shown;

[0129] Figure 59 The figure shows the positions of the vibration speaker and the air conduction speaker provided in the embodiment of the present application on the user's head;

[0130] Figure 60 shows the amplitude-frequency characteristics of sound leakage of the vibration speaker provided according to an embodiment of the present application; and

[0131] Figure 61 The figure shows the amplitude-frequency characteristics of sound leakage of the vibration speaker provided in an embodiment of the present application at different powers.

[0132] Those skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. DETAILED DESCRIPTION

[0133] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0134] The following description of exemplary embodiments of the present application is provided in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual embodiments are described in this specification. It should also be noted that, to avoid obscuring the present application with unnecessary detail, the accompanying drawings only illustrate device structures and / or processing steps that are closely related to the solutions according to the present application, while omitting other details that are not relevant to the present application.

[0135] In summary, after reading this detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure may be presented by way of example only and may not be limiting. Although not expressly stated herein, those skilled in the art will understand that this application is intended to encompass various reasonable changes, improvements, and modifications to the embodiments. Such changes, improvements, and modifications are intended to be suggested by this disclosure and are within the spirit and scope of the exemplary embodiments of the present disclosure.

[0136] It should be understood that the term "and / or" used in this embodiment includes any or all combinations of one or more of the associated listed items. It should be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or intermediate elements can exist.

[0137] Similarly, it should be understood that when an element such as a layer, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may be present. In contrast, the term "directly" indicates the absence of intervening elements. It should also be understood that the terms "comprising," "including," "include," and / or "comprising," when used herein, indicate the presence of recited features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0138] It should also be understood that although the terms first, second, third, etc. may be used to describe various elements herein, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Therefore, without departing from the teachings of the present invention, the first element in some embodiments may be referred to as the second element in other embodiments. The same reference numerals or the same reference designators represent the same elements throughout the specification.

[0139] In addition, exemplary embodiments are described with reference to cross-sectional illustrations and / or planar illustrations that are idealized exemplary illustrations. Therefore, differences from the illustrated shapes due to, for example, manufacturing techniques and / or tolerances are foreseeable. Therefore, exemplary embodiments should not be interpreted as limited to the shapes of the regions shown herein, but should include deviations in shape due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have rounded or curved features. Therefore, the regions shown in the figures are schematic in nature, and their shapes are not intended to illustrate the actual shape of the region of the device nor to limit the scope of the exemplary embodiments.

[0140] Figure 1 FIG2 is a schematic diagram of a sound output device according to an embodiment of the present application. The sound output device 1 may include a signal processing module 2 and an output module 3 .

[0141] The signal processing module 2 can be configured to receive an initial acoustic signal from a signal source, process the initial acoustic signal, and output a corresponding control signal. The initial acoustic signal can be any acoustic analog signal directly collected from the external environment, for example, an analog signal (electronic signal or radio signal) obtained by directly collecting any perceptible mechanical vibration conducted by air or bone, or it can be any digital or analog signal (electronic signal or radio signal) converted from an acoustic signal imported from an external device. The output module 3 can be configured to output corresponding bone conduction sound waves and / or air conduction sound waves according to the control signal output by the signal processing module 2. In the present application, bone conduction sound waves refer to sound waves conducted by mechanical vibrations via bones into the ear (also known as "bone conduction sound"), and air conduction sound waves refer to sound waves conducted by mechanical vibrations via air into the ear (also known as "air conduction sound"). Low frequency may refer to the frequency range of approximately 20 Hz to 150 Hz, medium frequency may refer to the frequency range of approximately 150 Hz to 5 kHz, and high frequency may refer to the frequency range of approximately 5 kHz to 20 kHz. Low-mid frequency may refer to the frequency range of approximately 150 Hz to 500 Hz, and medium-high frequency may refer to the frequency range of 500 Hz to 5 kHz. Those skilled in the art will understand that the above frequency band distinctions are merely examples. The definitions of the above frequency bands may vary depending on different industries, application scenarios, and classification standards. For example, in some application scenarios, low frequency may refer to the frequency range of approximately 20 Hz to 80 Hz, low-mid frequency may refer to the frequency range of approximately 80 Hz to 160 Hz, medium frequency may refer to the frequency range of approximately 160 Hz to 1280 Hz, medium-high frequency may refer to the frequency range of approximately 1280 Hz to 2560 Hz, and high frequency may refer to the frequency range of approximately 2560 Hz to 20 kHz.

[0142] The output module 3 may further include a vibration speaker 31 and an air conduction speaker 32. The air conduction speaker 32 may refer to a speaker that outputs air-conducted sound waves, and the vibration speaker 31 may refer to a speaker that outputs sound waves conducted by a solid medium (such as bone-conducted sound waves). The vibration speaker 31 may be coupled to the signal processing module 2 and configured to generate bone-conducted sound waves according to the control signal. The air conduction speaker 32 may be coupled to the signal processing module 2 and configured to generate air-conducted sound waves according to the control signal. The vibration speaker 31 and the air conduction speaker 32 may be two independent functional devices, or they may be part of a single device that can perform multiple functions. In some embodiments, the signal processing module 2 may be integrated with the vibration speaker 31 and the air conduction speaker 32 or formed into one body.

[0143] Figure 2 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 2The embodiment shown is Figure 1 The illustrated embodiments are similar with the following differences.

[0144] The signal processing module 2 may further include a bone conduction signal processing circuit 21 and an air conduction signal processing circuit 22. Here, an air conduction signal may refer to an electrical signal related to air-conducted sound waves and / or causing the output of such air-conducted sound waves; a bone conduction signal may refer to an electrical signal related to bone-conducted sound waves and / or causing the output of such bone-conducted sound waves. The bone conduction signal processing circuit 21 may be configured to receive an initial acoustic signal from the signal source, process the initial acoustic signal, and output a corresponding bone conduction control signal. The air conduction signal processing circuit 22 may be configured to receive an initial acoustic signal from the signal source, process the initial acoustic signal, and output a corresponding air conduction control signal. The air conduction control signal refers to a signal that controls the generation and output of air-conducted sound waves; the bone conduction signal refers to a signal that controls the generation and output of bone-conducted sound waves.

[0145] The output module 3 may further include a vibration speaker 31 and an air conduction speaker 32. The vibration speaker 31 may be coupled to the bone conduction signal processing circuit 21 and configured to generate bone conduction sound waves according to the bone conduction control signal. The air conduction speaker 32 may be coupled to the air conduction signal processing circuit 22 and configured to generate air conduction sound waves according to the air conduction control signal. In some embodiments, the bone conduction signal processing circuit 21 may be integrated or formed as one body with the vibration speaker 31. In some embodiments, the air conduction signal processing circuit 22 may be integrated or formed as one body with the air conduction speaker 32.

[0146] In order to adjust the output characteristics of bone-conducted sound waves and air-conducted sound waves (for example, frequency, phase, amplitude, etc.), the corresponding control signals can be processed in the signal processing module 2 so that the output air-conducted sound waves and bone-conducted sound waves respectively contain specific frequency components. Alternatively, the structure of each component or the arrangement of each component can be set and optimized in the output module 3 so that the output air-conducted sound waves and bone-conducted sound waves respectively contain specific frequency components.

[0147] When the properties of the sound waves outputted are changed by adjusting the signal processing module 2, several filters / filter groups can be set to process the input signal to output a signal containing different frequency components, which is then outputted to the corresponding output module for sound (air conduction) or vibration (bone conduction). The filter / filter group includes but is not limited to analog filters, digital filters, passive filters, active filters, etc. In some embodiments, time domain processing methods such as dynamic range control (DRC), delay and reverberation can be set to further increase the richness and experience of the sound. In some embodiments, an active leakage reduction module can be set. In some embodiments, a feedback-free method can be adopted, that is, without the aid of a reference microphone to feedback the sound field information, the output module 3 directly outputs the anti-phase sound wave of a specific frequency band and the leakage sound wave superposition and cancellation. In some embodiments, a feedback method can also be adopted, that is, a reference microphone is placed in the sound field to obtain the sound field information at that point, and the anti-phase sound wave signal is adjusted to the signal processing module in real time, so that the leakage sound pressure is eventually reduced. In some embodiments, a beamforming module may be provided to control the amplitude and phase of the radiation of each bone conduction or air conduction unit (i.e., the vibration speaker 31 and the air conduction speaker 32) in the sound output device 1, so that the output sound is synthesized into a certain sound beam. The sound beam may be fan-shaped with a certain radiation angle, and may propagate in a manually controlled direction to achieve corresponding directivity, thereby obtaining the maximum sound pressure level near the human ear, while the sound pressure level at other locations in the sound field is relatively low, thereby reducing sound leakage. In some embodiments, the sound output device 1 may utilize 3D sound field reconstruction or local sound field control technology to reconstruct a more ideal, three-dimensional sound field, so that people can obtain a better immersive sound field experience.

[0148] Figure 3 A schematic diagram of a sound output device according to an embodiment of the present application is shown. As shown, the sound output device 1 may include a signal processing module 2, a vibration speaker 31, and an air conduction speaker 32. The signal processing module 2 may include a bone conduction signal processing circuit 21 and an air conduction signal processing circuit 22. The air conduction speaker 32 may include a high-frequency air conduction speaker 328 and a low-frequency air conduction speaker 329.

[0149] The bone conduction signal processing circuit 21 may include a full-frequency signal processing module 210. The full-frequency signal processing module 210 may be configured to generate a bone conduction output signal based on an initial acoustic signal (e.g., a signal collected from an external sound source or a signal imported from an external device). The full-frequency signal processing module 210 may include an equalizer 211, a dynamic range controller 212, a phase processor 213, and a first power amplifier 214. The equalizer 211 may be configured to perform separate gain or attenuation on the input signal (e.g., the initial acoustic signal) according to specific frequency bands. The dynamic range controller 212 may be configured to compress and amplify the input signal, for example, to make the sound softer or louder. The phase processor 213 may be configured to adjust the phase of the input signal. The power amplifier 204 may be configured to amplify the amplitude of the input signal. In some embodiments, the initial acoustic signal may be processed by the equalizer 211, the dynamic range controller 212, the phase processor 213, and / or the first power amplifier 214 to become the bone conduction control signal, which is used to control the vibration speaker 31 to generate bone-conducted sound waves.

[0150] An equalizer is a device used to adjust specific frequencies in a sound. A dynamic range controller is a device that controls the dynamic range of a signal. Dynamic range control is the adaptive adjustment of a signal's dynamic range. The dynamic range of a signal is the logarithmic ratio of the maximum signal amplitude to the minimum signal amplitude, specified in dB. Dynamic range control can be used to match the audio signal level to its environment, thereby protecting the AD converter from overload. A phase processor is an electronic sound processor used to filter a signal by creating a series of peaks and valleys in the frequency spectrum. The positions of the peaks and valleys of the affected waveform are often adjusted so that they vary over time, creating a sweeping effect.

[0151] The air conduction signal processing circuit 22 may include a frequency division module 221, a high-frequency signal processing module 222, a low-frequency signal processing module 223, a second power amplifier 224, and a third power amplifier 225. The frequency division module 221 may be configured to decompose the initial signal from the sound source into a high-frequency signal component and a low-frequency signal component. In some embodiments, the frequency division module 221 may also be configured to decompose the initial acoustic signal into signal components in three or more frequency bands. The high-frequency signal processing module 222 may be coupled to the frequency division module 221 and configured to generate a high-frequency output signal based on the high-frequency signal component. The high-frequency output signal, after being amplified by the second power amplifier 224, becomes a high-frequency air conduction control signal, thereby controlling the high-frequency air conduction speaker 328 to generate high-frequency air-conducted sound waves. In some embodiments, the high-frequency signal processing module 222 may include an equalizer 2221, a dynamic range controller 2222, and a phase processor 2223. The low-frequency signal processing module 223 may be coupled to the frequency division module 221 and configured to generate a low-frequency output signal based on the low-frequency signal component. The low-frequency output signal is amplified by the third power amplifier 225 to become a low-frequency air conduction control signal, thereby controlling the low-frequency air conduction speaker 329 to generate low-frequency air-conducted sound waves. In some embodiments, the low-frequency signal processing module 223 may include an equalizer 2231, a dynamic range controller 2232, and a phase processor 2233.

[0152] The signal processing module 2 of the above-described embodiment can enhance low frequencies and reduce high-frequency sound leakage. In some open-ear acoustic devices, such as bone conduction headphones, insufficient low-frequency sound and excessive high-frequency sound leakage often occur. To address this problem, the sound output device 1 can utilize a vibration output device (e.g., a vibration speaker) to output full-band vibration or bone-conducted sound (or vibrations that have been weakened to reduce the discomfort of low-frequency vibrations), allowing the user to hear through bone conduction or other means. Simultaneously, the sound output device 1 utilizes an air-conducted output device (e.g., an air-conducted speaker) to output air-conducted sound waves. The low-frequency components of these air-conducted sound waves can be used to enhance the user's low-frequency sound perception, while the high-frequency components can be used to attenuate high-frequency sound leakage. In other words, the high-frequency portion of the air-conducted sound waves can serve as a sound-cancelling frequency wave, at least partially attenuating the high-frequency portion of the bone-conducted sound waves. A frequency division module is also provided to divide the audio signal into a high-frequency signal and a low-frequency signal. The high-frequency signal undergoes amplitude and phase processing by the high-frequency signal processing module, resulting in an amplitude and phase that cancels out the high-frequency sound leakage. The low-frequency signal undergoes amplitude and phase processing in the low-frequency signal processing module, achieving the amplitude and phase necessary to enhance low-frequency sound effects. The processed high-frequency and low-frequency air conduction control signals are combined to form an air conduction control signal. After power amplification, the air conduction sound waves are output by the air conduction speaker. The high-frequency components of these air conduction control signals cancel out the sound leakage from the vibration speaker, while the low-frequency components enhance the low-frequency sound effects.

[0153] Figure 4 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 4 The embodiment shown is Figure 3 The embodiment shown is similar, except that Figure 4 In the illustrated embodiment, the air conduction signal processing circuit 22 further includes a signal synthesis module 226. The signal synthesis module 226 can be coupled to the high-frequency signal processing module 222 and the low-frequency signal processing module 223 and configured to synthesize the high-frequency output signal and the low-frequency output signal into an air conduction output signal. The air conduction output signal can be amplified by the fifth power amplifier 228 into the air conduction control signal for controlling the air conduction speaker 32 to generate the air conduction sound waves.

[0154] Figure 5 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 5 The embodiment shown is Figure 4 The embodiments shown are basically similar, except that Figure 5 In the illustrated embodiment, the signal processing module 2 may further include a noise signal processing module 24 and a first microphone 25. The noise signal processing module 24 may be coupled to the first microphone 25 and the air conduction signal processing circuit 22. The first microphone 25 may be configured to collect ambient noise at a specific location (e.g., near a signal source) and output a noise signal. The noise signal processing module 24 may be configured to receive the noise signal and perform noise reduction on the air conduction output signal based on the noise signal. The air conduction control signal after noise reduction is output through an amplifier via an air conduction speaker, thereby achieving the technical effect of active noise reduction in a specific area.

[0155] Figure 6 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 6 The embodiment shown is Figure 5 The embodiments shown are basically similar, except that Figure 6 In the illustrated embodiment, the first microphone 25 can be configured to collect sound signals from the area to be noise-reduced (e.g., the area near the air conduction speaker 32) and output an error signal (e.g., for noise control). The noise signal processing module 24 can be configured to receive the error signal and perform noise reduction on the air conduction output signal based on the error signal to further adjust the air conduction sound wave signal to achieve noise control in the specific area.

[0156] Figure 7 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 7 The embodiment shown is Figure 5 The embodiments shown are basically similar, except that Figure 7In the illustrated embodiment, the noise signal processing module 24 is not coupled to the air conduction signal processing circuit 22, but rather to an independent fourth power amplifier 227. The noise reduction signal generated by the noise signal processing module 24 is processed by the fourth power amplifier 227 and then output through a separate auxiliary air conduction speaker 327. This noise reduction sound interacts with the sound output by other modules to achieve active noise control in a specific area.

[0157] Figure 8 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 8 The embodiment shown is Figure 7 The embodiments shown are basically similar, except that Figure 8 In the illustrated embodiment, the signal processing module 2 may further include a noise signal feedback module 27 and a second microphone 28. The second microphone 28 may be configured to collect sound signals from the area to be noise reduced (e.g., the area near the air conduction speaker 32) and output an error signal (e.g., for noise control). The noise signal feedback module 27 may be coupled to the noise signal processing module 24 and configured to receive the error signal and generate a feedback signal based on the error signal. The noise signal processing module 24 may be configured to generate a noise reduction signal based on the noise signal and the feedback signal to reduce the noise of the air conduction output signal. The noise reduction signal may be output through the auxiliary air conduction speaker 327 via the fourth power amplifier 227 to achieve noise control in a specific area. The noise control is achieved by combining the two modes of feedforward and feedback.

[0158] Figure 9A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. The signal processing module 2 may include a sub-band decomposition module 120, a vibration signal processing module 121, a sound signal processing module 122, multiple first power amplifiers 123, and multiple second power amplifiers 124. The sub-band decomposition module 120 may be configured to decompose an initial acoustic signal from a sound into multiple signal components, each of which is located in a different frequency band. The vibration signal processing module 121 may be configured to generate multiple bone conduction output signals based on the multiple signal components, each of which is located in the different frequency bands. The sound signal processing module 122 may be configured to generate multiple air conduction output signals based on the multiple signal components, each of which is located in the different frequency bands. Multiple first power amplifiers 123 may be coupled to the vibration signal processing module 121 and configured to amplify each of the multiple bone conduction output signals into bone conduction control signals of the corresponding frequency bands. Multiple second power amplifiers 124 can be coupled to the sound signal processing module 122 and configured to amplify the multiple air conduction output signals into air conduction control signals of corresponding frequency bands. The sound output device 1 can include multiple vibration speakers 31 and multiple air conduction speakers 32. The multiple vibration speakers 31 can be coupled to the multiple first power amplifiers 123 in a one-to-one correspondence and generate bone conduction sound waves of corresponding frequency bands based on the bone conduction control signals of corresponding frequency bands. The multiple air conduction speakers 32 can be coupled to the multiple second power amplifiers 124 in a one-to-one correspondence and generate air conduction sound waves of corresponding frequency bands based on the air conduction control signals of corresponding frequency bands.

[0159] This embodiment allows for processing of vibration and sound output requirements in different frequency bands. The processed sub-band signals can be output via a power amplifier and corresponding vibration speakers or sound output modules to achieve bone conduction and air conduction sound wave output effects in different frequency bands. In some embodiments, the processed sub-band signals can also be synthesized and then output via a power amplifier and corresponding one or more vibration speakers and air conduction speakers to achieve the corresponding effects.

[0160] In an embodiment in which the characteristics of the output sound waves are changed by adjusting the output module 3, the structures of the vibration speaker 31 (i.e., the vibration output module) and the air conduction speaker 32 (i.e., the sound output module) can be adjusted respectively to ensure that the output bone-conducted sound waves (i.e., vibration) and air-conducted sound waves (i.e., sound) contain specific frequency components.

[0161] Figure 10 The schematic diagram of the resonance system provided according to the embodiment of the present application is shown. The resonance system can be described by a mass spring damping model. A more complex resonance system can be considered to be composed of multiple mass spring damping systems in series and parallel. Figure 2As shown, the motion of the system can be described by the following differential equation:

[0162]

[0163] Where M is the mass of the system, R is the damping of the system, K is the elastic coefficient of the system, F is the driving force, and x is the displacement of the system. Solving the above equations gives the resonant frequency of the system:

[0164]

[0165] Calculating the frequency bandwidth at half power point, the system quality factor Q is:

[0166]

[0167] In the case of multiple resonant systems, the vibration characteristics (amplitude-frequency response, phase-frequency response, transient response, etc.) of each resonant system may be the same or different. For example, each resonant system may be driven by the same driving force or by different driving forces. In some embodiments, the vibration speaker 31 or the air conduction speaker 32 may be a single resonant system or a complex resonant system composed of multiple resonant systems. In one embodiment, the output module 3 may include multiple vibration speakers 31 and / or multiple air conduction speakers 32.

[0168] Figure 11 A schematic diagram showing the same driving force driving two resonant systems is shown. In this application, this diagram corresponds to the following situation: the control signal of the signal processing module 2 can generate a driving force to simultaneously drive the vibration speaker 31 and the air conduction speaker 32 to generate bone conduction sound and air conduction sound waves, respectively.

[0169] For bone conduction sound, the frequency and bandwidth can be changed by adjusting the above parameters. For example, by increasing the mass of the resonant system and reducing the system elastic coefficient (such as setting a reed with a lower elastic coefficient, using a material with a lower Young's modulus for the vibration transmission structure, reducing the thickness of the vibration transmission structure, etc.), its resonant frequency can be adjusted to the medium and low frequency bands, so that it outputs vibrations in the medium and low frequency bands. Conversely, by reducing the mass of the resonant system and increasing the system elastic coefficient (such as setting a reed with a higher elastic coefficient, using a material with a higher Young's modulus for the vibration transmission structure, increasing the thickness of the vibration transmission structure, for example, setting a rib plate / rib structure on the vibration transmission structure), its resonant frequency can be adjusted to the medium and high frequency bands, so that it outputs vibrations in the medium and high frequency bands. For example, the system quality factor Q can be adjusted by adjusting the system damping, that is, the bandwidth of the output vibration can be adjusted. Furthermore, a composite vibration module with multiple resonant systems can be provided, and each resonant system can adjust its resonant frequency and quality factor Q separately. By connecting each resonant system in series or in parallel, the center frequency and bandwidth of the output vibration of the composite vibration module can be adjusted.

[0170] For air-conducted sound waves, the center frequency can be adjusted by adjusting the mass and elastic coefficient of the resonant system, and the bandwidth of the output air-conducted sound waves can be adjusted by adjusting the system damping. In some embodiments, one or more acoustic structures (e.g., an acoustic cavity, an acoustic tube, an acoustic hole, a tuning hole, a tuning mesh, a tuning cotton, a passive diaphragm, and / or a combination thereof) can be provided to adjust the frequency component of the output air-conducted sound waves. For example, the elastic coefficient of the system can be adjusted by adjusting the volume of the acoustic cavity (e.g., if the acoustic cavity volume increases, the system elastic coefficient decreases; if the acoustic cavity volume decreases, the system elastic coefficient increases). In some embodiments, an acoustic tube or an acoustic hole structure can be provided to adjust the mass and damping of the system (e.g., the longer the acoustic tube or hole and the smaller the cross-sectional area, the greater the acoustic mass and the lower the acoustic damping; and vice versa). In some embodiments, acoustically resistive materials (tuning holes, meshes, cotton, etc.) can be provided in the path through which the air-conducted sound waves are transmitted to adjust the system damping. In some embodiments, a passive diaphragm structure can be provided to enhance the output of low-frequency air-conducted sound waves. In some embodiments, a sound-conducting tube / inverted port structure can be provided to adjust the phase of the air-conducted sound wave output in addition to the amplitude and frequency band. In some embodiments, an array of multiple air-conduction speakers can be provided. In some embodiments, the output amplitude, frequency band, and phase of each air-conduction speaker can be adjusted to achieve a sound field with a specific spatial distribution across the entire array.

[0171] The user can also adjust the output characteristics of bone conduction sound and / or air conduction sound waves by adjusting the amplitude, frequency, and phase of the control signal. The user can also adjust the output characteristics of bone conduction sound and / or air conduction sound waves by adjusting the control signal and the parameters of the resonance system simultaneously.

[0172] Figure 12 The amplitude-frequency characteristics of two different resonant systems driven by the same driving force are shown. Figure 13 The figure shows the phase-frequency characteristics of two different resonant systems when they are driven by the same driving force. As shown in the figure, the first resonant system and the second resonant system have different resonant frequencies. Correspondingly, the phase-frequency responses of the two resonant systems are also different. In particular, in the frequency band between the two resonant frequencies, the phase difference between the two resonant systems is 180 degrees, that is, they are in anti-phase. Therefore, when the two resonant systems are output as vibration speakers 31 or air conduction speakers 32 respectively, the vibrations of the two resonant systems will cancel each other out in this frequency band. As shown in the amplitude-frequency response curve of the total output in the figure, it has a clear omission in the frequency band between the two resonant frequencies.

[0173] Figure 14A schematic diagram shows a pair of opposing driving forces driving two resonant systems. In this application, this diagram corresponds to the following situation: the control signal from signal processing module 2 can generate a pair of opposing driving forces, driving vibration speaker 31 and air conduction speaker 32, respectively, to produce bone-conducted sound and air-conducted sound waves. For example, in a dynamic coil configuration, the action and reaction forces of the coil force and the magnetic circuit force can be used as the driving forces.

[0174] Figure 15 The amplitude-frequency characteristics of two different resonant systems driven by the same driving force are shown. Figure 16 The figure shows the phase-frequency characteristics of two different resonant systems when they are driven by the same driving force. As shown in the figure, the first resonant system and the second resonant system have different resonant frequencies and phase-frequency responses respectively. In particular, in the frequency band between the two resonant frequencies, the two resonant systems have the same phase, but in other frequency bands, the phase difference between the two is 180 degrees, that is, anti-phase. Therefore, when the two resonant systems are output as vibration speakers 31 or air conduction speakers 32 respectively, the vibrations of the two resonant systems will appear to increase and cancel each other in different frequency bands. As shown in the amplitude-frequency response curve of the total output in the figure, the two vibrations are superimposed and increased in the frequency band between the two resonant frequencies, and superimposed and canceled in other frequency bands. The cancellation is particularly significant in the low frequency band.

[0175] Figure 17 A schematic diagram showing two resonant systems driven by different driving forces is shown. In the present application, this diagram corresponds to the following situation: the signal processing module 2 may include a bone conduction signal processing circuit 21 and an air conduction signal processing circuit 22. The bone conduction control signal from the bone conduction signal processing circuit 21 generates one driving force to drive the vibration speaker 31 to produce bone-conducted sound waves, and the air conduction control signal from the air conduction signal processing circuit 22 generates another driving force to drive the air conduction speaker 32 to produce air-conducted sound waves. For example, in a dynamic coil configuration, different coils can be used to drive the vibration speaker 31 and the air conduction speaker 32 respectively.

[0176] In some embodiments, the user can achieve various output effects by adjusting the amplitude of each control signal at the same frequency, the amplitude at different frequencies, and the phase. For example, the magnitude of the corresponding driving force can be adjusted by adjusting the amplitude of the corresponding bone conduction control signal or the air conduction control signal. For example, the driving force can have a specific amplitude-frequency characteristic by adjusting the amplitude of the corresponding bone conduction control signal or the air conduction control signal in different frequency bands, thereby making the output bone conduction sound and air conduction sound waves have specific amplitude-frequency characteristics. For example, the driving force can have a specific phase-frequency characteristic by adjusting the phase of the corresponding bone conduction control signal or the air conduction control signal in different frequency bands, thereby making the output bone conduction sound and air conduction sound waves have specific phase-frequency characteristics. Through the above-mentioned adjustment method, the total output of the system can have different amplitude-frequency characteristics and phase-frequency characteristics.

[0177] In some embodiments, the magnitude of the driving force converted from the signal can be adjusted by adjusting the electromechanical conversion coefficient of the corresponding output module. For example, in a moving coil configuration, the electromechanical conversion coefficient can be adjusted by adjusting the magnetic field strength, coil impedance, coil wire length, etc.; in a moving iron configuration, the electromechanical conversion coefficient can be adjusted by adjusting the magnetic field strength, coil impedance, coil turns, coil shape, armature elasticity, etc.

[0178] In some embodiments, the amplitude-frequency and phase-frequency characteristics of the output can be adjusted by adjusting the mass, elasticity, and damping of the mechanical vibration module in the output module. For example, the amplitude-frequency and phase-frequency characteristics of the output can be adjusted by adjusting the acoustic structure (e.g., the acoustic cavity, acoustic conduit, tuning hole, tuning net, etc.) in the sound output module.

[0179] Figure 18 The figure shows the amplitude-frequency characteristics of two different resonant systems driven by the same driving force. By adjusting the phase of the output of different resonant systems, the output phase can be enhanced within a specific frequency band.

[0180] Figure 19 The figure shows the amplitude-frequency characteristics of two different resonant systems driven by the same driving force. By adjusting the phase of the outputs of the different resonant systems, they can produce an output cancellation effect within a specific frequency band.

[0181] Figure 20 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown.

[0182] The vibration speaker 31 may include a vibration component 310. The vibration component 310 can be electrically connected to the signal processing module to receive the control signal and generate the bone conduction sound wave based on the control signal. For example, the vibration component 310 can be any element (e.g., a vibration motor, an electromagnetic vibration device, etc.) that converts an electrical signal (e.g., a control signal from the signal processing module 2) into a mechanical vibration signal, wherein the signal conversion method includes but is not limited to: electromagnetic (moving coil type, moving iron type, magnetostrictive type), piezoelectric type, electrostatic type, etc. The internal structure of the vibration component 310 can be a single resonance system or a composite resonance system. The vibration component 310 can perform a first mechanical vibration according to the control signal, wherein the first mechanical vibration generates a bone conduction sound wave 5. The vibration component 310 may include a contact portion, which is used to fit the user's head skin when the user wears the sound output device 1, thereby conducting the bone conduction sound wave 5 to the user's cochlea via the user's skull.

[0183] The air conduction speaker 32 may include a housing 320. The housing 320 may be coupled to the vibration assembly 310 and generate air conduction sound waves 6 based on the bone conduction sound waves 5. The housing 320 may be connected to the vibration assembly 310 via a connector 33. The housing 320 may serve as a secondary resonant system for the first mechanical vibration. On the one hand, the housing 320 itself may serve as a mechanical system that can generate a second mechanical vibration under the excitation (actuation) of the first mechanical vibration; on the other hand, after the second mechanical vibration is conducted into the air to form sound (i.e., air conduction sound waves 6), the interior space of the housing 320 may serve as a resonant chamber to amplify the sound. In some embodiments, the response of the housing 320 to the first mechanical vibration may be adjusted by adjusting the connector 33 between the housing 320 and the vibration assembly 310, that is, the acoustic effect of the housing 320 may be adjusted by adjusting the connector 33. For example, the connector 33 may be rigid. The connector 33 may also be flexible. For example, the connector 33 may be an elastic member, such as a spring or a spring. Because systems with different elastic coefficients respond differently to the same frequency input, the amplitude of the second mechanical vibration to different frequency excitations can be adjusted by changing the elastic coefficient of the connector 33 and / or the elastic coefficient and mass of the housing 320. In some embodiments, the sound output device is an earphone. For ease of explanation, Figure 20 The earphones shown are quadrilateral in structure. Of course, the earphones may also have other shapes, such as cylindrical, ordinary earplug shape, and other shapes suitable for the internal structure of the ear canal, etc.

[0184] In summary, Figure 2 The sound output device shown can directly output bone-conducted sound waves to the outside when the vibration component 310 is working, such as outputting bone-conducted sound to the human body by fitting the human skin. At the same time, the first mechanical vibration generated by the vibration component 310 is transmitted to the shell 320 through the connecting member, so that the shell 320 also has a certain vibration, that is, the second mechanical vibration. The second vibration can be used as a sound source of air-conducted sound waves to radiate sound to the outside world, thereby realizing that a device outputs bone-conducted sound waves and air-conducted sound waves at the same time. Furthermore, the bone-conducted sound waves and air-conducted sound waves output by the sound output device come from the same driving source, so the bone-conducted sound waves (or first mechanical vibrations) and air-conducted sound waves (or second mechanical vibrations) output by it are correlated.

[0185] Figure 21 Shown Figure 20The amplitude-frequency characteristics of the bone-conducted sound waves and the air-conducted sound waves of the structure shown. As can be seen from the figure, the spectrum of the output bone-conducted sound waves is related to the spectrum of the air-conducted sound waves, and the positions of the resonance peaks correspond to each other. However, since the bone-conducted sound waves are generated by the vibration speaker 31, and the air-conducted sound waves are generated by the secondary resonant system being subjected to the first mechanical vibration, their responses in amplitude to the excitation signal of the same frequency are different. Figure 21 As shown in the amplitude-frequency characteristics of bone-conducted sound waves and air-conducted sound waves, the bone-conducted sound waves output by the sound output device have a greater amplitude output than the air-conducted sound waves in the frequency ranges of approximately 0 Hz to 23 Hz and above approximately 1300 Hz. In the frequency range of 23 Hz to 1300 Hz, the amplitude of the air-conducted sound waves output by the sound output device is greater than that of the bone-conducted sound waves.

[0186] Since the human voice and the sound of musical instruments are basically concentrated between 20Hz-5KHz. Therefore, if this interval is taken as the target frequency range, the target frequency range can be divided into three frequency intervals: low frequency, medium frequency, and high frequency. For example, as mentioned above, low frequency can refer to the frequency band of approximately 20Hz to 150Hz, medium frequency can refer to the frequency band of approximately 150Hz to 5KHz, high frequency can refer to the frequency band of approximately 5KHz to 20KHz, medium-low frequency can refer to the frequency band of approximately 150Hz to 500Hz, and medium-high frequency refers to the frequency band of 500Hz to 5KHz. Those skilled in the art will understand that the distinction between the above frequency bands is only given as an example. The definition of the above frequency bands may change with different industries, different application scenarios and different classification standards. For example, in some other application scenarios, low frequency refers to the frequency band of roughly 20Hz to 80Hz, mid-low frequency may refer to the frequency band of roughly 80Hz-160Hz, mid-frequency may refer to the frequency band of roughly 160Hz to 1280Hz, mid-high frequency may refer to the frequency band of roughly 1280Hz-2560Hz, and high frequency band may refer to the frequency band of roughly 2560Hz to 120KHz.

[0187] For the same control signal from the signal processing module 2, the air-conducted sound wave has a larger amplitude output in the low-frequency range, while the bone-conducted sound wave has a larger amplitude output in the high-frequency range. In the intermediate frequency range, with 1.3 Hz as the boundary, the amplitude of the air-conducted sound wave output by the sound output device can be greater than or less than the amplitude of the bone-conducted sound wave. Of course, the above description of the sound wave output is limited to Figure 20 Changing the design of the sound output device can change the distribution of its bone-conducted sound waves and air-conducted sound waves.

[0188] Therefore, by adjusting the shape, position, and rigidity of various components of the sound output device, the device can adjust the output amplitude of bone-conducted and air-conducted sound waves at different frequency bands within the target frequency range, thereby creating different output sound effects. For example, in bone conduction headphones, air-conducted sound waves can supplement bone-conducted sound waves, enhancing the user's overall acoustic experience.

[0189] In the following description, this application will introduce different design solutions of the sound output device respectively.

[0190] Figure 22 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 22 Zhongyu Figure 20 Elements with the same reference numerals have the same or similar structures and will not be described in detail here.

[0191] In this embodiment, the housing 320 also includes a sound outlet 322. Air-conducted sound waves 6 are output from the inside of the housing 320 to the outside of the housing 320 through the sound outlet 322. The air conduction speaker 32 also includes a tuning mesh 323 covering the sound outlet 322. The tuning mesh 323 can be used to adjust the frequency of the air-conducted sound waves 6. In some embodiments, the housing 320 may define a cavity 319 to accommodate a portion of the vibration component 310. In some embodiments, the sound outlet 322 may be a tuning hole that guides the air-conducted sound waves generated by the first mechanical vibration of the vibration component 310 inside the housing 320 due to the vibration of the air outside the housing 320, and interacts with the air-conducted sound waves generated by the vibration of the housing 320 itself (i.e., the second mechanical vibration) to form a comprehensive air-conducted sound wave output. In some embodiments, the housing 320 may include multiple sound outlets 322. The user can adjust the air-conducted sound wave output by adjusting the number, position, size and / or shape of the sound outlets 322.

[0192] Figure 23 Schematic diagram showing different positions of the sound outlet. In some embodiments, the sound outlet 322 can be oriented so that when the sound output device is located at the user's temple, it faces away from the temple. In some embodiments, the sound outlet 322 can be oriented so that when the sound output device is located at the user's temple, it faces toward the user's external auditory canal. In some embodiments, the sound outlet 322 can be oriented so that when the sound output device is located at the user's temple, it faces behind the user's ear. In some embodiments, the sound outlet 322 can be oriented so that when the sound output device is located at the user's temple, it faces toward the top of the user's head.

[0193] Figure 24The figure shows the amplitude-frequency characteristics of air-conducted sound waves at different sound outlet positions. As shown, assume the sound output device is placed slightly above and in front of the ear, with its vibration speaker in contact with the head to output vibrations. Placing sound outlets at different locations on the housing will result in different air-conducted sound waves reaching the ear. Compared to the case without sound outlets, placing sound outlets on the back of the housing (position P1) increases the high-frequency content of the air-conducted sound reaching the ear while reducing the mid-frequency content. Placing sound outlets on the side of the housing, facing the ear (position P2), significantly increases the mid- and high-frequency components of the air-conducted sound waves reaching the ear, improving the overall acoustic volume and the quality of voice communication. Placing sound outlets on the side of the housing, facing behind the ear (position P3), increases the mid- and high-frequency content of the air-conducted sound waves reaching the ear, but the increase is not as significant as when the holes are drilled directly toward the ear. Placing sound outlets on the side of the housing, facing the top of the head (position P4), only slightly increases the volume of the air-conducted sound waves reaching the ear, but the effect is not significant. Furthermore, the position of the sound outlet is not limited to the above-mentioned single position, but may also be a combination of multiple positions, and the number of the sound outlet may be one or more than one.

[0194] Therefore, by adjusting the position of the sound output device's sound outlet on the housing 320, the amplitude-frequency characteristics of the sound output device's air-conducted sound waves can be adjusted. Adjusting the design of the sound output device can also alter the distribution of its bone-conducted and air-conducted sound waves. For example, in bone conduction headphones, air-conducted sound waves can supplement bone-conducted sound waves, enhancing the user's overall acoustic experience.

[0195] Figure 25 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 25 Zhongyu Figure 20 Elements with the same reference numerals have the same or similar structures and will not be described in detail here.

[0196] The vibration speaker 131 may include a vibration component 1310. The vibration component 1310 may be electrically connected to the signal processing module to receive the control signal and generate bone-conducted sound waves 5 based on the control signal. The vibration component 1310 may perform a first mechanical vibration in accordance with the control signal, wherein the first mechanical vibration generates the bone-conducted sound waves 5.

[0197] The vibration assembly 1310 may further include a magnetic circuit system 1311, a vibration plate 1312, and a coil 1313. The magnetic circuit system 1311 may be configured to generate a first magnetic field. Specifically, the magnetic circuit system 1311 may include a magnetic gap 1317 and be configured to generate the first magnetic field in the magnetic gap 1317. The vibration plate 1312 may be connected to the housing 1320 of the air conduction speaker 32. The coil 1313 may be mechanically connected to the vibration plate 1312 and electrically connected to the signal processing module. The coil 1313 may be placed in the magnetic gap 1317. The coil 1313 receives the control signal and generates a second magnetic field based on the control signal. Due to the interaction between the first magnetic field and the second magnetic field, the coil 1313 is subjected to a force F, which excites the vibration plate 1312 to vibrate, thereby generating bone-conducted sound waves 5. The vibration plate 1312 may include a sound outlet 1314.

[0198] The air conduction speaker 32 may include a housing 1320, a diaphragm 1321, a first tuning mesh 1322, and a second tuning mesh 1323. The housing 1320 may be connected to the diaphragm 1312 to define a cavity 1319 that accommodates the magnetic circuit system 1311 and the diaphragm 1321. The housing 1320 may include a tuning hole 1324. The diaphragm 1321 may be connected to the magnetic circuit system 1311 and the housing 1320. Due to the interaction between the first magnetic field and the second magnetic field, the magnetic circuit system 1311 is also subjected to a corresponding reaction force -F, which excites the diaphragm 1321 to vibrate, thereby generating air-conducted sound waves 6. The air-conducted sound waves 6 may be output from the interior of the housing 1320 (i.e., the cavity 1319) to the exterior of the housing 1320 through the sound outlet 1314. The first tuning mesh 1322 may cover the sound outlet 1314 to adjust the frequency of the air-conducted sound waves 6. The second tuning mesh 1323 can cover the tuning hole 1324 to adjust the pressure inside the housing 1320, thereby adjusting the frequency of the air-conducted sound wave 6. In some embodiments, there can be multiple sound outlet holes 1314. In some embodiments, there can be multiple tuning holes 1324.

[0199] By adjusting the stiffness of the vibration plate 1312 and / or the housing 1320 (e.g., structural dimensions, material elastic modulus, special mechanical structures such as ribs and ribs), the output characteristics of the bone-conducted sound waves 5 can be adjusted. The output characteristics of the air-conducted sound waves 6 can be adjusted by adjusting the shape, elastic modulus, and damping of the diaphragm 1321. The output characteristics of the air-conducted sound waves 6 can be adjusted by adjusting the number, position, size, and / or shape of the sound output holes 1314 and / or the tuning holes 1324.

[0200] Figure 26 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 26 The embodiment shown is Figure 25 The embodiment shown is similar, except that Figure 26In the illustrated embodiment, the sound outlet 1314 is located on the housing 1320 rather than on the vibration plate 1312 .

[0201] Figure 27 The amplitude-frequency characteristics of bone-conducted sound waves and air-conducted sound waves are shown. As shown in the figure, in some embodiments, the resonant frequency of the output bone-conducted sound waves can be increased to a high frequency by increasing the stiffness of the vibration plate and the shell, and the resonant frequency of the output air-conducted sound waves can be controlled at a low frequency by adjusting the magnetic circuit quality, the elastic coefficient of the diaphragm, setting tuning holes, etc. Bone-conducted sound waves can make people hear through bone conduction, and air-conducted sound waves can make people hear through traditional air conduction. Bone-conducted sound waves and air-conducted sound waves of different frequency bands can complement each other and enhance the user's listening experience. It allows users to hear enough low frequencies without feeling strong low-frequency vibrations. At the same time, bone-conducted sound waves also enhance the user's perception of high frequencies.

[0202] Figure 28 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 28 The embodiment shown and Figure 26 The embodiment shown is similar, except that Figure 28 In the illustrated embodiment, the magnetic circuit system 1311 is connected to the housing 1320 via a first elastic member 1315. By connecting the magnetic circuit system 1311 and the housing 1320 via the first elastic member 1315, a portion of the vibration generated by the magnetic circuit system 1311 is output to the housing 1320 and combines with the vibration of the vibration plate 1312 to produce bone-conducted sound waves. Another portion of the vibration generated by the magnetic circuit system 1311 excites the diaphragm 1321 to produce air-conducted sound waves. By adjusting the elastic modulus of the first elastic member 1315, at least two resonance peaks can be generated within the audible range of the human ear, achieving a wider frequency range of bone-conducted sound waves.

[0203] Figure 29 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 29 The embodiment shown is Figure 26 The embodiment shown is similar, except that Figure 29In the illustrated embodiment, the magnetic circuit system 1311 is connected to the vibration plate 1312 via a first elastic member 1315, and the vibration plate 1312 is connected to the housing 1320 via a second elastic member 1316. In this embodiment, the magnetic circuit system 1311 is not connected to the housing 1320. In some embodiments, the vibration plate 1312 may have an "I"-shaped cross-section, the upper portion of the vibration plate 1312 may be located outside the cavity 1319, and the lower portion of the vibration plate 1312 may be located inside the cavity 1319. In some embodiments, the magnetic circuit system 1311 may be connected to the middle portion of the vibration plate 1312 via the elastic member 1315. By adjusting the elastic coefficients of the first elastic member 1315 and / or the second elastic member 1316, at least three resonance peaks may be generated within the audible range of the human ear, thereby achieving the output of a wider frequency bone-conducted sound wave.

[0204] Figure 30 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 30 The embodiment shown is Figure 26 The embodiment shown is similar, except that Figure 30 In the illustrated embodiment, the vibration assembly 1310 may further include a magnetic circuit system 1311 and a vibration plate 1312 rigidly connected to each other, the vibration plate 1312 being connected to the housing 1320 via a second elastic member 1316, and the air conduction speaker 32 may include a coil 1313 and a diaphragm 1321 connected to each other. In this embodiment, the coil 1313 is not connected to the vibration plate 1312. In this embodiment, because the system composed of the coil 1313 and the diaphragm 1321 has a relatively small mass, a wide-band air-conducted sound wave output can be achieved. Furthermore, because the mass of the magnetic circuit system 1311, the vibration plate 1312, and the second elastic member 1316 is relatively large, a low-frequency bone-conducted sound wave output can be achieved by adjusting the elastic coefficient of the second elastic member 1316.

[0205] Figure 31 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 31 The embodiment shown is Figure 26 The embodiment shown is similar, except that Figure 31 In the illustrated embodiment, the first tuning mesh 1322 is not provided, and the air conduction speaker 32 may include a sound guide tube 1326. The sound guide tube 1326 may be connected to the housing 1320 and communicate with the sound outlet 1314. The sound guide tube 1326 is configured to adjust the phase of the air-conducted sound waves 6 and / or change the propagation direction of the air-conducted sound waves 6, thereby adjusting the output quality of the air-conducted sound waves 6 and enhancing the output effect of the air-conducted sound waves 6. For example, by directing the air-conducted sound waves 6 toward the ear through the sound guide tube 1326, the volume of the air-conducted sound waves heard by the human ear can be increased.

[0206] Figure 32A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 32 The embodiment shown is Figure 26 The embodiment shown is similar, except that Figure 32 In the illustrated embodiment, the second tuning mesh 1323 is not provided, and the air conduction speaker 32 may include a sound guide tube 1326, which may be connected to the housing 1320 and communicate with the tuning hole 1324. By providing the sound guide tube 1326 at a location other than a sound output hole (such as the tuning hole 1324), the phase of the air-conducted sound wave 6 can be adjusted. The air-conducted sound wave 7 guided by the sound guide tube 1326 is superimposed with the air-conducted sound wave 6 output from the sound output hole 1314, thereby achieving control over the final air-conducted sound wave.

[0207] Figure 33 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown. Figure 33 The embodiment shown is Figure 26 The embodiment shown is similar, except that Figure 33 In the illustrated embodiment, the second tuning mesh 1323 is not provided, and the air conduction speaker 32 may include a passive diaphragm 1327, which may be mechanically connected to the tuning hole 1324. When the vibration plate 1312 vibrates to generate bone-conducted sound waves, the air pressure within the housing 1320 may change and / or vibrate accordingly. By covering the passive diaphragm 1327 at locations other than the sound-emitting holes (such as the tuning hole 1324), the vibration of the passive diaphragm 1327 caused by the pressure difference between the inside and outside of the housing 1320 can also radiate secondary air-conducted sound waves 7 to the outside world (i.e., the bone-conducted sound waves cause the air pressure inside the housing to change, thereby stimulating the vibration of the passive diaphragm to generate secondary air-conducted sound waves 7). By superimposing the secondary air-conducted sound waves 7 with the air-conducted sound waves 6 output from the sound-emitting holes 1314, the resulting air-conducted sound waves can be regulated.

[0208] Figure 34 A schematic diagram of a sound output device provided according to an embodiment of the present application is shown.

[0209] The vibration speaker 31 may include a first vibration assembly 2310 and an elastic member 2318. The first vibration assembly 2310 may be electrically connected to the bone conduction signal processing circuit 21 to receive the bone conduction control signal and generate bone conduction sound waves 5 based on the bone conduction control signal. The first vibration assembly 2310 may include a magnetic circuit system 2311, a vibration plate 2312, and a first coil 2313. The magnetic circuit system 2311 may be connected to the housing 2320 of the air conduction speaker 32 via the elastic member 2318. The magnetic circuit system 2311 may be configured to generate a first magnetic field. Specifically, the magnetic circuit system 2311 may include a first magnetic gap 2317 and a second magnetic gap 2328 and may be configured to generate the first magnetic field within the first magnetic gap 2317 and the second magnetic gap 2328. The vibration plate 2312 may be connected to the housing 2320. The first coil 2313 may be mechanically connected to the vibration plate 2312 and electrically connected to the bone conduction signal processing circuit 21. The first coil 2313 may be disposed in the first magnetic gap 2317. The first coil 2313 receives the bone conduction control signal and generates a second magnetic field based on the bone conduction control signal. Due to the interaction between the first magnetic field and the second magnetic field, the first coil 2313 is subjected to a force F1, thereby exciting the vibration plate 2312 to vibrate, thereby generating bone conduction sound waves 5. The vibration plate 2312 may include a sound outlet hole 2314.

[0210] The air conduction speaker 32 may include a housing 2320, a second vibration assembly 2316, a first tuning mesh 2322, and a second tuning mesh 2323. The housing 2320 may be connected to the vibration plate 2312 to define a cavity 2319 that accommodates the magnetic circuit system 2311 and the diaphragm 2321. The second vibration assembly 2316 may be electrically connected to the air conduction signal processing circuit 22 to receive the air conduction control signal and generate air-conducted sound waves 6 based on the air conduction control signal. The second vibration assembly 2316 may include a diaphragm 2321 and a second coil 2327. The diaphragm 2321 may be connected to the housing 2320 and to the second coil 2327. The second coil 2327 may be electrically connected to the air conduction signal processing circuit 22. The second coil 2327 may be disposed in a second magnetic gap 2328. The second coil 2327 receives the air conduction control signal and generates a third magnetic field based on the air conduction control signal. Due to the interaction between the first magnetic field and the third magnetic field, the second coil 2327 is subjected to a force F2, which excites the diaphragm 2321 to vibrate, generating air-conducted sound waves 6. The air-conducted sound waves 6 can be output from the interior of the housing 2320 (i.e., the cavity 2319) to the exterior of the housing 2320 through the sound outlet 2314. The first tuning mesh 2322 can cover the sound outlet 2314 to adjust the frequency of the air-conducted sound waves 6. The second tuning mesh 2323 can cover the tuning hole 2324 to adjust the pressure inside the housing 2320, thereby adjusting the frequency of the air-conducted sound waves 6. In some embodiments, there may be multiple sound outlet holes 2314. In some embodiments, there may be multiple tuning holes 2324.

[0211] In summary, by adjusting the different positions of the sound output holes of the sound output device on the shell, adjusting the stiffness of the vibration plate and the shell, adjusting the magnetic circuit quality, the elastic coefficient of the diaphragm, setting the tuning holes, etc., the frequency range and amplitude of the air-conducted sound waves and bone-conducted sound waves output by the sound output device can be adjusted. Bone-conducted sound waves can make people hear through bone conduction, and air-conducted sound waves can make people hear through traditional air conduction. Bone-conducted sound waves and air-conducted sound waves of different frequency bands can complement each other and enhance the user's overall acoustic experience.

[0212] for example Figure 35 The figure shows an amplitude-frequency characteristic of a sound output device according to an embodiment of the present application. As shown in the figure, for example, the bone-conducted sound waves and the air-conducted sound waves contain different frequency components, which can achieve the technical effect of complementing each other in frequency bands.

[0213] In some embodiments, air-conducted sound waves contain mid- and low-frequency components, while bone-conducted sound waves contain mid- and high-frequency components. Users can hear mid- and low-frequency sounds through air conduction, and mid- and high-frequency sounds through bone conduction. By supplementing the low-frequency sound with air-conducted sound waves, good sound quality (especially low frequencies) can be maintained while avoiding the intense vibrations associated with low-frequency bone-conducted sound waves.

[0214] In some embodiments, the sound output device is configured to output sound waves within a target frequency range, the bone-conducted sound waves include a high-frequency portion of the target frequency range, and the air-conducted sound waves include a low-frequency portion of the target frequency range.

[0215] In some embodiments, the bone-conducted sound waves may include a mid-frequency portion in the target frequency range, and the air-conducted sound waves may include a mid-frequency portion in the target frequency range.

[0216] In some embodiments, air-conducted sound waves contain mid-to-high frequency components, while bone-conducted sound waves contain mid-to-low frequency components. Because users are more sensitive to mid-to-high frequency sounds, and their skin is generally more sensitive to low-frequency mechanical vibrations, these output modes can provide prompts to users simultaneously through hearing and touch, achieving dual-mode prompts / alerts.

[0217] In some embodiments, the vibration speaker is further configured to generate low-frequency vibration waves that are perceptible to the user's skin.

[0218] In some embodiments, the user can adjust the parameters of the corresponding signal processing module (e.g., bone conduction signal processing module, air conduction signal processing module) and / or output module (e.g., vibration speaker, air conduction speaker) to make the air conduction sound waves and bone conduction sound waves contain the required frequency band components respectively.

[0219] Figure 36 Another amplitude-frequency characteristic of the sound output device provided according to an embodiment of the present application is shown. As shown in the figure, for example, bone-conducted sound waves and air-conducted sound waves contain the same frequency components, which can enhance the technical effect of a certain frequency band.

[0220] In some embodiments, bone-conducted sound waves (vibration) and air-conducted sound waves (sound) contain the same frequency components in the low- and mid-frequency ranges. This combination of components can achieve a higher mid- and low-frequency output than a higher- and mid-frequency output. The human ear's hearing threshold / equal-loudness curve exhibits a higher mid- and low-frequency response, while a lower mid- and high-frequency response indicates that the human ear is more sensitive to mid- and high-frequency sounds. This output mode, where the mid- and low-frequency response is higher than the mid- and high-frequency response, effectively compensates for the weakening of low- and mid-frequency sounds caused by the human hearing threshold, resulting in a balanced sound experience across all frequency bands.

[0221] In some embodiments, the bone-conducted sound waves may include the low-frequency portion of the target frequency range, and the bone-conducted sound waves may be superimposed with the air-conducted sound waves, so that the output of the sound output device at mid-low frequencies is greater than its output at mid-high frequencies.

[0222] In some embodiments, air-conducted sound waves include mid- and low-frequency components, while bone-conducted sound waves include components across a wider frequency range than air-conducted sound waves. This allows bone-conducted listening, enhancing mid- and low-frequency components and improving sound quality without increasing the strong mechanical vibrations of mid- and low-frequency components, ensuring comfort and safety.

[0223] In some embodiments, bone-conducted sound waves contain mid- and low-frequency components, and air-conducted sound waves contain components with a wider frequency band than bone-conducted sound waves. By adding appropriate mid- and low-frequency vibrations, users can gain a tactile sensation while having an auditory sensation, thereby enhancing the listening experience.

[0224] In some embodiments, the air-conducted sound wave includes a mid-frequency portion in the target frequency range, the bone-conducted sound wave includes a low-frequency portion and a mid-frequency portion in the target frequency range, and the bone-conducted sound wave covers a wider frequency range than the air-conducted sound wave.

[0225] Figure 37 Another amplitude-frequency characteristic of a sound output device provided according to an embodiment of the present application is shown. As shown in the figure, for example, the air-conducted sound waves and the bone-conducted sound waves contain the same frequency components in the mid- and high-frequency bands. The same frequency components can be sound waves with mute frequencies. That is, when the same frequency components of the air-conducted sound waves and the bone-conducted sound waves are opposite in phase, mid- and high-frequency sound leakage can be weakened. In addition, when the same frequency components of the air-conducted sound waves and the bone-conducted sound waves are in phase, mid- and high-frequency sound leakage can be enhanced.

[0226] In some embodiments, the air-conducted sound waves include mid- and high-frequency components, and the bone-conducted sound waves include components with a wider frequency band than the air-conducted sound waves. The air-conducted sound waves can be used as a sound source for anti-phase cancellation to offset the mid- and high-frequency sound leakage caused by the bone-conducting device.

[0227] In some embodiments, the air-conducted sound waves may include a common sound-absorbing frequency sound wave with the bone-conducted sound waves, the air-conducted sound waves may include a mid-frequency part and a high-frequency part in the target frequency range, and the bone-conducted sound waves may cover a wider frequency range than the air-conducted sound waves.

[0228] Figure 38 Another amplitude-frequency characteristic of the sound output device provided according to an embodiment of the present application is shown.

[0229] In some embodiments, bone-conducted sound waves contain mid- and high-frequency components, while air-conducted sound waves contain components with a wider frequency band than bone-conducted sound waves, thereby enhancing mid- and high-frequency sounds. In particular, for specific air-conducted open-ear solutions, bone-conducted sound waves can be used to compensate for the shortcomings of air-conducted sound waves in the mid- and high-frequency ranges (e.g., due to acoustic structure or vibration segmentation).

[0230] In some embodiments, the air-conducted sound waves may include a mid-frequency portion and a high-frequency portion in the target frequency range, the bone-conducted sound waves may include a mid-frequency portion in the target frequency range, and the air-conducted sound waves may cover a wider frequency range than the bone-conducted sound waves.

[0231] In some embodiments, the output of sound (air conduction) and vibration (bone conduction) can be completed by independent modules / devices. In addition to the corresponding signal processing and the characteristics of the individual modules / devices themselves, the factors affecting their output effects include the location of the modules / devices and the interactions / influences between the modules / devices, which will also affect the final output effects.

[0232] For sound output modules / devices (e.g., air conduction speakers), the boundary conditions surrounding their location can affect the output of the module / device. For example, if a sound output module is placed near a human head, the sound it outputs will be affected by the shape of the head, facial features, and auricles.

[0233] Figure 39 The figure shows the amplitude-frequency characteristics of the sound when the sound output module provided by the embodiment of the present application is in different positions on the head. As shown in the figure, the sound output by the sound output module placed at different positions near the human head is affected by the above-mentioned boundaries in different ways, resulting in different sounds transmitted to the human ear. The sound output from the sound source is relatively flat in all frequency bands, but after being placed at different positions on the head, the sound transmitted to the ear is affected by different boundaries on the sound transmission path and undergoes different changes, causing the sound transmitted to the ear to have peak and valley changes in the mid- and high-frequency bands.

[0234] In some embodiments, when the sound output device is worn by a user, one or more air-conduction speakers of the sound output device may be located behind the user's head, on top of the head, on the forehead, on the bridge of the nose, behind the ear, on top of the ear and / or in front of the ear.

[0235] Due to the influence of different boundaries, the sound source can diffuse into the surrounding space, the sound field established in the surrounding space, and the sound leakage will also be different.

[0236] Figure 40 The amplitude-frequency characteristics of sound leakage from a sound output module according to an embodiment of the present application are shown. As shown in the figure, in the sound leakage spectrum relative to the sound source in an unobstructed free field, placing the sound source at different positions on the head will affect the sound leakage to the outside world, resulting in changes in the spectrum of the sound leakage. This change also occurs primarily in the mid- and high-frequency bands.

[0237] For vibration output modules / devices (e.g., vibration speakers), since they require contact with the user to transmit vibration, different contact locations between the module / device and the user will provide different vibration experiences. The vibration output of the module / device is affected by the tissue mechanical properties at the location of the contact, the pressure and pressure distribution of the contact surface, and the direction of vibration.

[0238] Some vibration output modules / devices will output sound into the surrounding space when in operation, and the output sound will also be affected by the surrounding boundary conditions.

[0239] Figure 41 The amplitude-frequency characteristics of the sound leakage of the vibration output module provided in accordance with the embodiment of the present application are shown. Taking the vibration output module / device attached to different positions of the human head as an example, as shown in the figure, the sound diffused to the surrounding space / the sound field established in the surrounding space / the sound leakage will also be different at different positions. Compared with the sound leakage of the vibration output module / device under the condition of free field without attachment, when the vibration output module / device is attached to different positions of the human head, the sound leakage changes significantly in the middle and high frequency bands, that is, the sound leakage in the middle frequency band decreases, and the sound leakage in the high frequency band increases.

[0240] In some embodiments, when the sound output device is worn by the user, one or more vibration speakers of the sound output device may be located on the user's mastoid process, back of the head, top of the head, forehead, bridge of the nose, behind the ear, top of the ear and / or in front of the ear.

[0241] The outputs of each module / device can interact / influence each other. The user's final experience is the result of the combined effects of each module / device. The relevant factors between each module / device will affect their interaction.

[0242] The spacing between modules / devices can affect the amplitude and phase of the output of one module / device reaching another module / device, and also affect the amplitude and phase of the output of each module / device at a certain point in space, ultimately affecting the overall output effect.

[0243] Figure 42 A schematic diagram showing the positional relationship of two dipole sound sources provided according to an embodiment of the present application is shown. Figure 43 The figure shows the amplitude-frequency characteristics of two dipole sound sources at different distances, according to an embodiment of the present application. As shown in the figure, taking two dipole sound sources at a certain distance as an example, the sound sources have the same amplitude and opposite phases. As the distance between the two sources changes, the sound energy / volume output to the outside world changes. Under this condition, as the distance between the two sound sources increases, the sound volume output to the outside world increases.

[0244] The amplitude of each module / device directly affects the amplitude of its output at a specific location in space, which in turn affects the interaction between the outputs of each module / device. Furthermore, because the output of each module / device forms a specific sound field distribution in space, the impact of the module / device amplitude will vary at different locations in space.

[0245] Figure 44 A schematic diagram showing the positional relationship of two dipole sound sources provided according to an embodiment of the present application is shown. Figure 45 The normal amplitude-frequency characteristics of two dipole sound sources provided in an embodiment of the present application at different amplitude ratios are shown. Figure 46 The axial amplitude-frequency characteristics of two dipole sound sources provided in accordance with an embodiment of the present application at different amplitude ratios are shown. As shown in the figure, taking two dipole sound sources with a certain spacing, a certain relative angle, and opposite phases to each other as an example, when the amplitude of one sound source changes relative to the amplitude of the other sound source, the sound field generated in the space will change. Among them, at the position of the perpendicular bisector of the line connecting the two sound sources (normal), as the amplitude ratio of one sound source relative to the amplitude of the other sound source changes from small to large, the sound pressure level at this position also increases. At the position of the extended line of the line connecting the two sound sources (axial), as the amplitude ratio of one sound source relative to the amplitude of the other sound source changes from small to large, the sound pressure level at this position decreases.

[0246] The phase of each module / device itself can directly affect the phase of its output to a certain point in space, thereby affecting the interaction results of the outputs of each module / device.

[0247] Figure 47 A schematic diagram showing the positional relationship of two monopole sound sources provided according to an embodiment of the present application is shown. Figure 48 The figure shows the amplitude-frequency characteristics of two monopole sound sources at different phase differences according to an embodiment of the present application. As shown in the figure, taking two monopole sound sources with a certain spacing and the same amplitude as an example, when the phase difference between the two sound sources changes, the energy / volume output to the outside world will change. As the phase difference between the two gradually approaches 180°, the output energy / volume gradually decreases (the sound pressure level decreases). At the same time, the amplitude of the reduction in low frequency is greater than the amplitude of the reduction in high frequency.

[0248] The output of some modules / devices themselves has directivity / spatial anisotropy of output. Therefore, the spatial position and posture of the module / device with such characteristics will affect the sound field distribution it establishes in space, and thus affect the overall output effect.

[0249] Figure 49 A schematic diagram showing the positional relationship of two dipole sound sources provided according to an embodiment of the present application is shown. Figure 50The relationship between the normal angle and amplitude of two dipole sound sources provided in an embodiment of the present application at different frequencies is shown. Figure 51 The relationship between the axial angle and amplitude of two dipole sound sources at different frequencies provided in accordance with an embodiment of the present application is shown. As shown in the figure, taking two dipole sound sources with a certain distance and opposite phases as an example, when the polar axis directions of the two sound sources are different, the sounds output outward are also different. The angle formed between the polar axis direction and the line connecting the two sound sources is taken as the rotation angle, and the rotation angles of the two sound sources are complementary. As the rotation angle changes, the sound pressure level / volume at different positions in space is different. At the position of the perpendicular bisector of the line connecting the two sound sources (normal), the sound pressure level has a maximum value at a rotation angle of about 80° and a minimum value at about 165°. At the position of the extended line of the line connecting the two sound sources (axial), the sound pressure level has a minimum value at a rotation angle of about 90°.

[0250] Each module / device has a specific spatial arrangement, which also produces a sound field with a special distribution.

[0251] Figure 52 A schematic diagram showing the positional relationship of five monopole sound sources provided according to an embodiment of the present application is shown. Figure 53 The figure shows the amplitude distribution of five monopole sound sources at different frequencies provided by an embodiment of the present application. As shown in the figure, taking five monopole sound sources arranged at equal intervals according to a plane quadratic curve as an example, a focus of the sound field can be generated near the focus of the quadratic curve, where the sound pressure level / volume reaches a maximum. The effect of this sound focusing is different for signals of different frequencies, and the focusing effect becomes more obvious as the frequency increases. This focusing effect also makes the output of the entire module have spatial directionality.

[0252] When the modules / devices have a specific spatial arrangement, the output phase difference between the modules / devices can affect the shape of the entire sound field and the spatial directivity of the entire module output.

[0253] Figure 54 A schematic diagram showing the positional relationship of five monopole sound sources provided according to an embodiment of the present application is shown. Figure 55 The figure shows the amplitude distribution of five monopole sound sources at different phase differences according to an embodiment of the present application. As shown in the figure, the five monopole sound sources are arranged at equal intervals along a quadratic curve, and the output phase of each sound source increases (or decreases) by an angle θ along the quadratic curve. As the angle θ changes, the focal position of the sound field changes. As the angle θ increases from 0° to 90°, the position of the sound field focal point moves in the direction of phase lag.

[0254] When the modules / devices have a specific spatial arrangement, the output amplitudes between the modules / devices will affect the shape of the entire sound field and the spatial directivity of the entire module output.

[0255] Figure 56 A schematic diagram showing the positional relationship of five monopole sound sources provided according to an embodiment of the present application is shown.

[0256] Figure 57 The figure shows the amplitude distribution of five monopole sound sources at different amplitude ratios provided in accordance with an embodiment of the present application. As shown in the figure, the five monopole sound sources are arranged at equal intervals along the quadratic curve, and the output amplitude of each sound source increases (or decreases) proportionally with a along the distributed quadratic curve. When the ratio a changes, the effect of sound focusing changes. The smaller the proportional coefficient a (the larger the amplitude difference between modules / devices), the worse the focusing effect, and the focal position moves toward the direction of the sound source with a larger amplitude. At the same time, when the amplitude ratio a changes, the pointing direction of the output of the entire module changes, and it deflects toward the direction of the sound source with a larger amplitude.

[0257] In some embodiments, the sound output device may include a plurality of air conduction speakers arranged at equal intervals along a quadratic curve. In some embodiments, the sound output device may include a plurality of vibration speakers arranged at equal intervals along a quadratic curve.

[0258] Figure 58 Various combinations of bone-conducted sound waves and air-conducted sound waves provided according to the embodiments of the present application are shown.

[0259] Vibration and sound can affect people's sense of touch and hearing respectively. The feeling they give people is stronger than that of only touch or only hearing, and produces unique feelings. Figure 58 As shown in (a), it is a working mode in which vibration and sound are output alternately, which can play the role of enhancing prompts or alarms. Compared with only vibration prompts or only sound prompts, this mode of alternating vibration and sound output can stimulate people's tactile and auditory perception and achieve a strong prompt effect. In some embodiments, the vibration is in the 1Hz-500Hz frequency band, and the sound is in the 1kHz-5kHz frequency band. Figure 58As shown in (b), it is a working mode in which vibration and sound are output simultaneously, which can stimulate people's tactile and auditory feelings at the same time, and also has a strong prompting effect. It can also be set so that the vibration changes with the change of sound (or the sound changes with the change of vibration), to enhance the human body's feelings through touch and hearing. For example, when playing games or watching movies, the sound of explosions is accompanied by corresponding vibration signals to enhance the user's feelings. In the scene of sound source localization, the vibration pattern is changed as the sound source positioning changes (for example, the vibration amplitude or frequency is changed) to prompt the sound source positioning; in VR / AR devices, the vibration pattern is changed as the vision and hearing change, and the immersion is enhanced through the fusion of vision, hearing and touch. Since vibration and sound trigger different receptors of the user respectively, the two feelings (touch and hearing) are clearly distinguishable. The two different feelings of touch and hearing can be used to represent different states to achieve the transmission of information. As Figure 58 As shown in (c) in the figure, the sound state (stimulating hearing) can be represented as state "0", and the vibration state (stimulating tactile sense) can be represented as state "1". The intermittent output of sound or vibration can form a string of binary information to realize the transmission of information. Figure 58 As shown in (d) in the figure, the sound state and the vibration state can be represented as "." and "—" in Morse code respectively, so that information can be transmitted through Morse code.

[0260] Figure 59 The positions of the vibration speaker and the air conduction speaker provided in an embodiment of the present application on the user's head are shown. Figure 60 The figure shows the amplitude-frequency characteristics of sound leakage of the vibration speaker provided according to the embodiment of the present application. Figure 61 The figure shows the amplitude-frequency characteristics of sound leakage at different power levels of a vibration speaker provided according to an embodiment of the present application. As shown in the figure, the vibration output module (e.g., a vibration speaker) outputs vibrations by attaching to the human head or outputs sound through bone conduction. At the same time, because the vibration output module drives the surrounding air to vibrate, air-conduction sound leakage occurs, affecting the user experience.

[0261] A sound output module is added on the basis of the vibration output module, and the air-conducted sound waves output by the sound output module interact with the air-conducted leakage sound generated by the vibration output module to reduce the leakage sound.

[0262] By adjusting the phase and amplitude of the sound output module (for example, an air conduction speaker), the effect of reducing external sound leakage can also be adjusted. Taking the case where the vibration output module is placed in front of the ear as an example, adjusting the phase of the sound output module so that the sound it outputs is in phase with the sound leakage of the vibration module, the sound leakage of the entire device will increase; adjusting the phase of the sound output module so that the sound it outputs is in phase opposite to the sound leakage of the vibration module, the sound leakage of the entire device will be reduced. Affected by the distance between the two modules, sound leakage reduction is only achieved in a specific frequency band.

[0263] By adjusting the signal amplitude of the sound output module, you can also adjust the amplitude of the sound output module, thereby affecting the effectiveness of reducing external sound leakage. If the output sound amplitude is too small, the sound cancellation effect is not obvious. If the output sound amplitude is too large, the output sound dominates the leakage sound component and fails to effectively reduce the leakage sound. Only when the output sound amplitude is comparable to the leakage sound amplitude can the leakage sound be effectively reduced.

[0264] In some embodiments, an augmented reality (AR) / virtual reality (VR) device includes a sound output device as described above. For example, one or more sound and vibration output modules may be provided on the AR / VR device to provide auditory and tactile input to the user. Combined with the visual input of the AR / VR device, the user's sense of immersion can be enhanced. In particular, a set of sound and vibration output modules may be provided on each of the user's left and right ears, which may provide the user with stereo sound effects while providing corresponding vibration patterns. In particular, an array of sound and vibration output modules may be provided on the eye mask or headband of the AR / VR device to achieve directional sound output, and the vibration output module array may also be used to provide spatial positioning prompts. For example, the output of the sound output module array may be controlled based on the user's movement and rotation signals obtained by sensors (three-axis accelerometer, gyroscope, etc.) to enable the user to locate the user through hearing. The vibration pattern of the vibration output module array may also be controlled to provide the user with information such as distance, angle, and force.

Claims

1. A sound output device, characterized in that: include: A signal processing module and a vibration speaker, the signal processing module including a bone conduction signal processing circuit and an air conduction signal processing circuit, the bone conduction signal processing circuit including a full-frequency signal processing module, the full-frequency signal processing module being configured to generate a bone conduction control signal based on an initial acoustic signal, the vibration speaker being configured to generate a bone conduction sound wave based on the bone conduction control signal, the air conduction signal processing circuit including a frequency division module, and a high-frequency signal processing module and a low-frequency signal processing module coupled to the frequency division module, the frequency division module being configured to decompose the initial acoustic signal into at least a high-frequency signal component and a low-frequency signal component; the high-frequency signal component, after amplitude and phase processing by the high-frequency signal processing module, having an amplitude and phase that cancel the high frequency of the bone conduction sound wave; After the low-frequency signal component is processed in terms of amplitude and phase by the low-frequency signal processing module, it has the low-frequency amplitude and phase that enhance the bone-conducted sound wave.

2. The sound output device according to claim 1, wherein The sound output device further includes an air conduction speaker, wherein the air conduction speaker includes: a high-frequency air conduction speaker configured to generate high-frequency air-conducted sound waves based on the processed high-frequency signal component; and The low-frequency air conduction speaker is configured to generate low-frequency air-conducted sound waves based on the processed low-frequency signal component.

3. The sound output device according to claim 1, wherein The sound output device also includes an air conduction speaker, and the air conduction signal processing circuit includes a signal synthesis module. The signal synthesis module is coupled to the high-frequency signal processing module and the low-frequency signal processing module, and is configured to synthesize an air conduction control signal based on the processed high-frequency signal component and the processed low-frequency signal component. The air conduction speaker is configured to generate air conduction sound waves based on the air conduction control signal.

4. The sound output device according to claim 3, wherein: The signal processing module further includes: A first microphone is configured to collect an ambient noise signal, The noise signal processing module is coupled to the first microphone and the air conduction signal processing circuit, and is configured to perform noise reduction on the air conduction control signal according to the ambient noise signal.

5. The sound output device according to claim 4, characterized in that The signal processing module further includes: a second microphone configured to collect a sound signal from the area to be noise reduced and generate an error signal based on the sound signal; and a noise signal feedback module, coupled to the second microphone and the noise signal processing module, and configured to generate a feedback signal according to the error signal, The noise signal processing module is configured to generate a noise reduction signal according to the ambient noise signal and the feedback signal.

6. The sound output device according to claim 3, wherein: The vibration speaker includes a magnetic circuit system, a vibration plate, a first coil, and an elastic member, wherein the magnetic circuit system is configured to generate a first magnetic field, the first coil is connected to the vibration plate, and is placed in a first magnetic gap of the magnetic circuit system, and the air conduction speaker includes a housing, a diaphragm, and a second coil, the diaphragm is connected to the housing, the second coil is connected to the diaphragm and is placed in a second magnetic gap of the magnetic circuit system, and the magnetic circuit system is connected to the housing via the elastic member; wherein the first coil is electrically connected to the bone conduction signal processing circuit to receive the bone conduction control signal and generate a second magnetic field based on the bone conduction control signal, and the first magnetic field interacts with the second magnetic field to enable the vibration plate to generate bone conduction sound waves; and The second coil is electrically connected to the air conduction signal processing circuit to receive the air conduction control signal, and generates a third magnetic field based on the air conduction control signal. The first magnetic field interacts with the third magnetic field to cause the diaphragm to generate air-conducted sound waves.

7. The sound output device according to claim 6, characterized in that The vibration plate is connected to the housing.

8. The sound output device according to claim 6, wherein: The shell includes a sound outlet hole and a tuning hole located on opposite sides of the diaphragm, and the air-conducted sound waves are output to the outside of the shell through the sound outlet holes.

9. The sound output device according to claim 8, characterized in that The sound output device includes a first tuning net and a second tuning net. The first tuning net covers the sound outlet to adjust the frequency of the air-conducted sound waves. The second tuning net covers the tuning hole to adjust the pressure inside the shell, thereby adjusting the frequency of the air-conducted sound waves.

10. The sound output device according to claim 8, wherein The sound outlet is oriented to face away from the temple or toward the external auditory canal of the user when the sound output device is worn on the temple of the user.

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