Bone conduction earphone and bone conduction earphone system thereof

Abstract

The invention discloses a bone conduction earphone and a bone conduction earphone system thereof, and relates to the technical field of bone conduction earphones, and the bone conduction earphone and the bone conduction earphone system thereof comprise a power supply module, a sound processing module and a connection module used for being connected with external equipment, the sound processing module comprises an audio input unit for receiving analog or digital audio signals from a microphone or other audio sources, the signal processing unit is used for processing the received audio signals; the vibration transmission unit is used for converting the processed audio signals into vibration signals and transmitting the vibration signals to auditory nerves of a user through skull bones; the signal processing unit comprises a noise reduction algorithm for reducing noise and a sound leakage prevention algorithm for reducing sound leakage of the bone conduction earphone; the noise reduction function and the sound leakage prevention function are achieved through the noise reduction algorithm and the sound leakage prevention algorithm respectively, and the noise reduction performance and the sound leakage prevention performance of the bone conduction earphone are improved.

Description

Technical Field

[0001] The present invention relates to the field of bone conduction earphones, and in particular to a bone conduction earphone and a bone conduction earphone system thereof. Background Art

[0002] Bone conduction headphones transmit sound to the skull through the vibration of the sound wave vibration unit, thus avoiding the traditional sound transmission path of the eardrum and ear canal; this sound transmission method presents an open experience, and there is no need to block the ear canal when in use, so sound leakage may occur; sound leakage means that sound is not only transmitted to the inner ear through the bones, but may also be transmitted to the surrounding environment through the air, which may affect the user's privacy protection and may also interfere with people around; bone conduction headphones in the prior art do not achieve noise reduction and sound leakage prevention functions by adopting noise reduction algorithms and sound leakage prevention algorithms respectively, and the noise reduction and sound leakage prevention performance of bone conduction headphones needs to be improved. Summary of the invention

[0003] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a bone conduction earphone and a bone conduction earphone system thereof, which realizes the input reception, signal processing and vibration transmission of audio signals by adopting an audio input unit, a signal processing unit and a vibration transmission unit, thereby meeting the transmission path requirements of the audio signal; and realizes the noise reduction function and the sound leakage prevention function respectively by adopting a noise reduction algorithm and a sound leakage prevention algorithm, thereby improving the noise reduction and sound leakage prevention performances of the bone conduction earphone.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: A bone conduction earphone system comprises a power module, a sound processing module and a connection module for connecting to an external device, wherein the power module is electrically connected to the sound processing module, and the sound processing module transmits signals to the connection module. The sound processing module comprises an audio input unit for receiving analog or digital audio signals from a microphone or other audio source, a signal processing unit for processing the received audio signal, and a vibration transmission unit for converting the processed audio signal into a vibration signal and transmitting it to the auditory nerve of the user through the skull. The audio signal passes through the audio input unit, the signal processing unit and the vibration transmission unit in sequence; the signal processing unit comprises a noise reduction algorithm for reducing noise and an anti-sound leakage algorithm for reducing sound leakage of the bone conduction earphone.

[0005] As a preferred solution: the anti-sound leakage algorithm includes the following steps: First, sound signal collection: First, the sound signal emitted by the vibration transmission unit is collected. The sound signal includes the sound that the earphone wants to transmit to the user and the sound leakage generated; Second, signal processing: Process the collected sound signals: the processing process includes signal analysis, filtering, and phase adjustment to generate an anti-phase sound wave that is opposite to the phase of the leaking sound wave; Third, generate an anti-phase sound wave: after the signal processing is completed, generate an anti-phase sound wave with a phase opposite to the leakage sound wave; this anti-phase sound wave will be sent to the speaker or vibration transmission unit of the headset to meet the leakage sound wave and cancel each other out; Fourth, sound output: The processed sound signal, including the original sound signal and the reverse sound wave, will be output to the user's ears.

[0006] As a preferred solution: the noise reduction algorithm includes the following steps: First, use a microphone to collect noise in the environment: the microphone converts the noise in the environment into an electrical signal, which is then converted into a digital signal by an analog-to-digital converter for subsequent digital signal processing; Second, model the environmental noise: use adaptive filters to estimate and track the characteristics of environmental noise, and obtain the noise model by monitoring the statistical characteristics and spectrum distribution information of the noise; Third, use the noise model to reduce or eliminate the noise from the original audio signal: use a digital filter to offset the noise component according to the parameters of the noise model.

[0007] As a preferred solution: the filter includes a finite impulse response filter and an infinite impulse response filter.

[0008] As a preferred solution: the connection module includes a wired connection unit that connects devices through a physical medium and a wireless connection unit that connects devices using a wireless communication unit, and the wireless communication unit includes Bluetooth, Wi-Fi and ultra-wideband.

[0009] As a preferred solution: the generation of reverse phase sound waves is: a reverse sound wave system is built into the bone conduction earphone, which can identify the leakage sound waves and simultaneously generate reverse phase sound waves opposite to the leakage sound to offset the leakage sound waves.

[0010] As a preferred solution: the vibration transmission unit is a vibrator, which uses piezoelectric ceramic material. The vibrator of the piezoelectric ceramic material serves as a vibration source, receives electrical signals from an audio device, and converts them into mechanical vibrations. The mechanical vibrations are directly transmitted to the user's inner ear by contacting the skin or bones, thereby realizing bone conduction of sound.

[0011] As a preferred solution: the vibration transfer unit includes a low-frequency piezoelectric vibrator for generating a low-frequency vibration signal and a high-frequency piezoelectric vibrator for generating a high-frequency vibration signal, which are connected to each other.

[0012] As a preferred solution: the power module includes a lithium battery and a charging interface, the charging interface is electrically connected to the lithium battery, and the charging interface includes Type-C and Micro USB.

[0013] A bone conduction earphone adopts the bone conduction earphone system.

[0014] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that the power supply module, the sound processing module and the connection module are used to realize the supply of power, sound processing and connection with external devices of the bone conduction earphones, thereby ensuring the functional effect of the bone conduction earphones; the input reception, signal processing and vibration transmission of audio signals are realized by adopting the audio input unit, the signal processing unit and the vibration transmission unit, thereby meeting the transmission path requirements of the audio signal; the noise reduction function and the sound leakage prevention function are respectively realized by adopting the noise reduction algorithm and the sound leakage prevention algorithm, thereby improving the noise reduction and sound leakage prevention performances of the bone conduction earphones.

[0015] In order to more clearly illustrate the structural features and effects of the present invention, it is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the principle of the sound leakage prevention algorithm of the present invention; Figure 2 Schematic diagram of the noise reduction algorithm principle of the present invention. DETAILED DESCRIPTION

[0017] The present invention Figure 1 As shown in FIG2 , a bone conduction earphone system includes a power module, a sound processing module and a connection module for connecting to an external device, wherein: The power module is electrically connected to the sound processing module, and the sound processing module transmits signals to the connection module. The sound processing module includes an audio input unit for receiving analog or digital audio signals from a microphone or other audio sources, a signal processing unit for processing the received audio signals, and a vibration transmission unit for converting the processed audio signals into vibration signals and transmitting them to the user's auditory nerve through the skull. The audio signal passes through the audio input unit, the signal processing unit and the vibration transmission unit in sequence; the signal processing unit includes a noise reduction algorithm for reducing noise and an anti-leakage algorithm for reducing sound leakage of bone conduction headphones.

[0018] The power module provides power to the sound processing module and the connection module; the sound processing module performs sound processing: the audio signal is input by the audio input unit, processed by the signal processing unit and transmitted to the vibration transmission unit, the vibration transmission unit converts the processed audio signal into a vibration signal and transmits it to the user through the skull; the signal processing unit performs noise reduction through a noise reduction algorithm and adopts an anti-leakage algorithm to reduce sound leakage; and the connection module is used to connect to an external device.

[0019] The power supply module, the sound processing module and the connection module are used to realize the supply of power, sound processing and connection with external devices of the bone conduction earphones, thereby ensuring the functional effect of the bone conduction earphones; the input reception, signal processing and vibration transmission of audio signals are realized by adopting the audio input unit, the signal processing unit and the vibration transmission unit, thereby meeting the transmission path requirements of the audio signal; the noise reduction function and the sound leakage prevention function are realized respectively by adopting the noise reduction algorithm and the sound leakage prevention algorithm, thereby improving the noise reduction and sound leakage prevention performance of the bone conduction earphones.

[0020] The anti-leakage algorithm includes the following steps: First, sound signal collection: First, the sound signal emitted by the vibration transmission unit is collected. The sound signal includes the sound that the earphone wants to transmit to the user and the sound leakage generated; Second, signal processing: Process the collected sound signals: the processing process includes signal analysis, filtering, and phase adjustment to generate an anti-phase sound wave that is opposite to the phase of the leaking sound wave; Third, generate an anti-phase sound wave: after the signal processing is completed, generate an anti-phase sound wave with a phase opposite to the leakage sound wave; this anti-phase sound wave will be sent to the speaker or vibration transmission unit of the headset to meet the leakage sound wave and cancel each other out; Fourth, sound output: The processed sound signal, including the original sound signal and the reverse sound wave, will be output to the user's ears.

[0021] Since the anti-phase sound waves and the leakage sound waves cancel each other out, the sound heard by the user will be clearer, while the leakage sound heard by people around will be greatly reduced.

[0022] The noise reduction algorithm includes the following steps: First, use a microphone to collect noise in the environment: the microphone converts the noise in the environment into an electrical signal, which is then converted into a digital signal by an analog-to-digital converter for subsequent digital signal processing; Second, model the environmental noise: use adaptive filters to estimate and track the characteristics of environmental noise, and obtain the noise model by monitoring the statistical characteristics and spectrum distribution information of the noise; Third, use the noise model to reduce or eliminate the noise from the original audio signal: use a digital filter to offset the noise component according to the parameters of the noise model.

[0023] The filter includes a finite impulse response filter and an infinite impulse response filter.

[0024] The generated reverse sound wave is: a reverse sound wave system is built into the bone conduction earphone, which can identify the leakage sound wave and simultaneously generate the reverse sound wave opposite to the leakage sound to cancel out the leakage sound wave.

[0025] The vibration transmission unit is a vibrator, which uses piezoelectric ceramic material. The vibrator of the piezoelectric ceramic material serves as a vibration source, receives electrical signals from the audio device, and converts them into mechanical vibrations. The mechanical vibrations are directly transmitted to the user's inner ear by contacting the skin or bones, thereby realizing bone conduction of sound.

[0026] The vibration transfer unit includes a low-frequency piezoelectric vibrator for generating a low-frequency vibration signal and a high-frequency piezoelectric vibrator for generating a high-frequency vibration signal, which are connected to each other.

[0027] Low-frequency piezoelectric vibrator: mainly responsible for generating low-frequency vibration signals; in bone conduction headphones, the low-frequency signal usually corresponds to the fundamental frequency part of the sound, which determines the basic characteristics of the tone and sound quality of the sound.

[0028] High-frequency piezoelectric vibrator: mainly responsible for generating high-frequency vibration signals; in bone conduction headphones, high-frequency signals usually correspond to the detailed parts of the sound, such as consonants, unvoiced sounds, etc., which determines the clarity and layering of the sound.

[0029] The working principle of the vibration transmission unit is: First, sound signal conversion: When the sound signal is transmitted through the audio input part of the bone conduction headset, the vibrator of the vibration transmission unit will receive the signal; Second, mechanical vibration generation: the vibrator generates mechanical vibration of corresponding frequency according to the received sound signal; Third, vibration transmission: the vibration is transmitted to the skull through the contact part between the earphone and the head; Fourth, auditory perception: The skull, as a medium for sound transmission, transmits the vibration further to the inner ear. The lymph fluid and auditory cells in the inner ear sense the vibration and convert it into nerve signals, which are finally interpreted as sound by the brain.

[0030] The connection module includes a wired connection unit that connects devices through a physical medium and a wireless connection unit that connects devices using a wireless communication unit. The physical medium includes cables and plug-ins; the wireless communication unit includes Bluetooth, Wi-Fi, and ultra-wideband.

[0031] The connection method of the wired connection unit is stable and reliable, but it is limited by the cable length and layout.

[0032] The connection method of the wireless connection unit is more flexible and convenient, and is suitable for scenarios that require mobile or remote transmission of audio signals.

[0033] The power module includes a lithium battery and a charging interface, the charging interface is electrically connected to the lithium battery, and the charging interface includes Type-C and Micro USB.

[0034] A bone conduction earphone adopts the bone conduction earphone system.

[0035] The method and principle of using the bone conduction earphone system are as follows: the power module provides power to the sound processing module and the connection module; the sound processing module performs sound processing: the audio signal is input by the audio input unit, and is transmitted to the vibration transmission unit after being processed by the signal processing unit. The vibration transmission unit converts the processed audio signal into a vibration signal and transmits it to the user through the skull; the signal processing unit performs noise reduction through a noise reduction algorithm and adopts an anti-leakage algorithm to reduce sound leakage; and the connection module is used to connect to an external device.

[0036] The design focus of the present invention is that the power supply module, sound processing module and connection module are used to realize the supply of power, sound processing and connection with external devices of the bone conduction earphones, thereby ensuring the functional effect of the bone conduction earphones; the input reception, signal processing and vibration transmission of audio signals are realized by using an audio input unit, a signal processing unit and a vibration transmission unit, thereby meeting the transmission path requirements of the audio signal; the noise reduction function and the sound leakage prevention function are respectively realized by using a noise reduction algorithm and a sound leakage prevention algorithm, thereby improving the noise reduction and sound leakage prevention performances of the bone conduction earphones.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A bone conduction earphone system, characterized in that: It includes a power module, a sound processing module and a connection module for connecting to an external device. The power module is electrically connected to the sound processing module, and the sound processing module transmits signals to the connection module. The sound processing module includes an audio input unit for receiving analog or digital audio signals from a microphone or other audio sources, a signal processing unit for processing the received audio signals, and a vibration transmission unit for converting the processed audio signals into vibration signals and transmitting them to the user's auditory nerve through the skull. The audio signals pass through the audio input unit, the signal processing unit and the vibration transmission unit in sequence; the signal processing unit includes a noise reduction algorithm for reducing noise and an anti-leakage algorithm for reducing sound leakage of bone conduction headphones.

2. The bone conduction earphone system according to claim 1, characterized in that: The anti-leakage algorithm comprises the following steps: First, sound signal collection: First, the sound signal emitted by the vibration transmission unit is collected. The sound signal includes the sound that the earphone wants to transmit to the user and the sound leakage generated; Second, signal processing: Process the collected sound signals: the processing process includes signal analysis, filtering, and phase adjustment to generate an anti-phase sound wave that is opposite to the phase of the leaking sound wave; Third, generate an anti-phase sound wave: after the signal processing is completed, generate an anti-phase sound wave with a phase opposite to the leakage sound wave; this anti-phase sound wave will be sent to the speaker or vibration transmission unit of the headset to meet the leakage sound wave and cancel each other out; Fourth, sound output: The processed sound signal, including the original sound signal and the reverse sound wave, will be output to the user's ears.

3. The bone conduction earphone system according to claim 1, characterized in that: The noise reduction algorithm comprises the following steps: First, use a microphone to collect noise in the environment: the microphone converts the noise in the environment into an electrical signal, which is then converted into a digital signal by an analog-to-digital converter for subsequent digital signal processing; Second, model the environmental noise: use adaptive filters to estimate and track the characteristics of environmental noise, and obtain the noise model by monitoring the statistical characteristics and spectrum distribution information of the noise; Third, use the noise model to reduce or eliminate the noise from the original audio signal: use a digital filter to offset the noise component according to the parameters of the noise model.

4. The bone conduction earphone system according to claim 3, characterized in that: The filters include finite impulse response filters and infinite impulse response filters.

5. The bone conduction earphone system according to claim 1, characterized in that: The connection module includes a wired connection unit that connects devices through a physical medium and a wireless connection unit that connects devices using a wireless communication unit, and the wireless communication unit includes Bluetooth, Wi-Fi and ultra-wideband.

6. The bone conduction earphone system according to claim 2, characterized in that: The generating of the reverse phase sound wave is as follows: a reverse phase sound wave system is built into the bone conduction earphone, which can identify the leakage sound wave and simultaneously generate the reverse phase sound wave opposite to the leakage sound to offset the leakage sound wave.

7. The bone conduction earphone system according to claim 1, characterized in that: The vibration transmission unit is a vibrator, which uses piezoelectric ceramic material. The vibrator of the piezoelectric ceramic material serves as a vibration source, receives electrical signals from the audio device, and converts them into mechanical vibrations. The mechanical vibrations are directly transmitted to the user's inner ear by contacting the skin or bones, thereby realizing bone conduction of sound.

8. The bone conduction earphone system according to claim 7, characterized in that: The vibration transfer unit includes a low-frequency piezoelectric vibrator for generating a low-frequency vibration signal and a high-frequency piezoelectric vibrator for generating a high-frequency vibration signal, which are connected to each other.

9. The bone conduction earphone system according to claim 8, characterized in that: The power module includes a lithium battery and a charging interface, the charging interface is electrically connected to the lithium battery, and the charging interface includes Type-C and Micro USB.

10. A bone conduction headset, characterized in that: A bone conduction earphone system as described in any one of claims 1 to 9 is used.

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