CN117221783B - Noise reduction method of Bluetooth headset noise reduction system and storage medium - Google Patents
Noise reduction method of Bluetooth headset noise reduction system and storage medium Download PDFInfo
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Abstract
The invention discloses a noise reduction method and a storage medium of a Bluetooth headset noise reduction system, and relates to the technical field of acoustics, wherein a microphone collects a signal of mixing a normally played music signal with residual noise, and the residual external noise sound wave is obtained after subtracting the normally played music signal; the method comprises the steps of generating reverse signals with opposite phases and the same amplitude as external noise sound waves, enabling the sound wave signals and the external noise sound waves to be overlapped and cancelled near ears after the reverse signals are processed by a noise reduction chip, obtaining normally played music signals, enabling the reverse signals to be transmitted by a feedback sensor, enabling the feedback sensor to adjust a transmission starting point of the reverse signals, establishing an attenuation model from the feedback sensor to the noise reduction chip, and compensating the reverse signals according to the attenuation model. The synchronization with the external noise sound wave is kept, and the attenuation model from the feedback sensor to the noise reduction chip is built, so that the normally played music signal is obtained, and the earphone user obtains good use experience.
Description
Technical Field
The invention relates to the technical field of acoustics, in particular to a noise reduction method and a storage medium of a Bluetooth headset noise reduction system.
Background
With the increasing popularity of terminals, especially mobile terminals and bluetooth functions, the technology is also becoming mature, and the application of bluetooth headsets is also becoming widespread. At present, two methods for noise reduction of the Bluetooth headset are available, namely active noise reduction and passive noise reduction. The active noise reduction function is to generate reverse sound waves equal to external noise through a noise reduction system and neutralize the noise, so that the noise reduction effect is realized. The active noise reduction earphone is provided with a noise reduction circuit which is against external noise, most of the active noise reduction earphone adopts a head-wearing design with larger volume, the external noise can be blocked by utilizing structures such as earplug cotton, earphone shell and the like, the first round of sound insulation is carried out, and meanwhile, the active noise reduction circuit and a power supply are also arranged for having sufficient space. The passive noise reduction earphone mainly forms a closed space by surrounding ears, or adopts sound insulation materials such as a silica gel earplug and the like to block external noise. Because the noise is not processed by the noise reduction circuit chip, the noise can be generally isolated from high-frequency noise, and the noise reduction effect on low-frequency noise is not obvious.
The existing noise reduction method lacks of synchronous control of a reverse signal for eliminating noise and noise, and the noise reduction effect is insufficient due to the fact that time difference exists between the reverse signal and the noise, in addition, when the reverse signal is output, attenuation of sound waves is not considered, and when the reverse signal reaches a noise reduction position, the strength of the reverse signal is inconsistent with the strength of the noise, and the noise reduction effect is affected.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a noise reduction method and a storage medium for a noise reduction system of a bluetooth headset, which solves the problems that the existing noise reduction method provided in the above background art lacks synchronization control of a reverse signal for eliminating noise and noise, and the noise reduction effect is insufficient due to a time difference between the reverse signal and the noise, and in addition, when the reverse signal is output, attenuation of sound waves is not considered, and when the reverse signal reaches a noise reduction position, the intensity of the reverse signal is inconsistent with the intensity of the noise, so that the noise reduction effect is affected.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a noise reduction method of a Bluetooth headset noise reduction system comprises the following steps:
The microphone collects the signal of the mixture of the normally played music signal and the external noise sound wave, and the external noise sound wave is obtained after subtracting the normally played music signal;
analyzing, identifying, filtering and inverting the external noise sound wave to generate an inverted signal with opposite phase and same amplitude as the external noise sound wave;
The reverse signal is converted into an acoustic wave signal after being processed by the noise reduction chip, the acoustic wave signal and an external noise acoustic wave are sent out by the earphone loudspeaker, the acoustic wave signal and the external noise acoustic wave are overlapped and cancelled near the ear, and the external noise acoustic wave in the signal mixed by the normally played music signal and the external noise acoustic wave is cancelled, so that the normally played music signal is obtained;
the reverse signal is transmitted by a feedback sensor, and the feedback sensor adjusts the transmission starting point of the reverse signal and keeps synchronism with the external noise sound wave;
establishing an attenuation model from the feedback sensor to the noise reduction chip;
the method for establishing the attenuation model from the feedback sensor to the noise reduction chip comprises the following steps of:
Acquiring at least one first sound wave intensity of different external noise sound waves captured at a feedback sensor, and acquiring at least one second sound wave intensity of different external noise sound waves at a noise reduction chip;
corresponding the first sound wave intensity and the second sound wave intensity, and pairing the first sound wave intensity and the second sound wave intensity into an array;
Conducting dotting on at least one group of first sound wave intensity and second sound wave intensity in a coordinate system, and selecting a function model for simulation according to an image obtained by dotting;
fitting according to the selected function model to obtain a fitting function of the attenuation model;
compensating the reverse signal according to the attenuation model;
Said compensating the inverse signal according to the attenuation model comprises the steps of:
obtaining a fitting function of the attenuation model, and obtaining third sound wave intensity of the external noise sound waves collected by the feedback sensor;
in the fitting function, taking the third sound wave intensity as a value after attenuation, and obtaining fourth sound wave intensity before attenuation corresponding to the third sound wave intensity;
Compensating the sound wave intensity of the reverse signal after noise reduction to fourth sound wave intensity;
The feedback sensor transmits the compensated reverse signal.
Preferably, the step of subtracting the music signal normally played to obtain the external noise sound wave includes the following steps:
Capturing vibration of the earphone, identifying and obtaining a music signal transmitted by the earphone, and generating a first signal function of the music signal;
the microphone collects the signals of the music signals normally played and the external noise sound waves, identifies the mixed signals and generates a second signal function of the mixed signals;
And the second signal function and the first signal function are subjected to difference to obtain a third signal function of the external noise sound wave, and the external noise sound wave is obtained according to the third signal function.
Preferably, the generating the reverse signal with the same amplitude and the opposite phase to the external noise sound wave comprises the following steps:
The separated external noise sound wave is obtained, the external noise sound wave is digitally processed and converted into an electric signal, sampling and quantization are carried out, and the sound wave function of the external noise sound wave is simulated according to the size of the electric signal;
collecting at least one amplitude of the acoustic wave function within a preset time range, and calculating the average value of all the amplitudes to obtain an identification amplitude;
Removing the part exceeding the identification amplitude in the acoustic wave function as an abnormal value, and replacing the abnormal value by using the identification amplitude to finish filtering the external noise acoustic wave;
And (3) making an image of the acoustic wave function, and carrying out symmetry on the image about a transverse axis to obtain a new acoustic wave function, converting the new acoustic wave function into an electric signal, and obtaining a reverse signal according to the size of the electric signal.
Preferably, the superposition cancellation of the acoustic wave signal and the external noise acoustic wave near the ear comprises the following steps:
outputting sound wave signals near ears, and mixing the sound wave signals with the signals of the normally played music signals and the external noise sound waves;
And the fourth signal function of the sound wave signal and the third signal function doped in the mixed signal cancel each other out to obtain a normally played music signal.
Preferably, the feedback sensor adjusts a transmission start point of the reverse signal, and maintains synchronism with the external noise sound wave, including the steps of:
The feedback sensor counts at least one preset time consumed by reverse signal generation, and average preset time is obtained by averaging the at least one preset time;
the feedback sensor absorbs the signal mixed by the normally played music signal and the external noise sound wave, and temporarily stores the signal mixed by the normally played music signal and the external noise sound wave to the average preset time;
when the average preset time is reached, the generated reverse signal is obtained, and the signal mixed by the normally played music signal and the external noise sound wave and the reverse signal are transmitted at the same transmission starting point.
Preferably, the feedback sensor absorbs the signal mixed by the music signal and the external noise sound wave which are normally played, and temporarily stores the signal mixed by the music signal and the external noise sound wave which are normally played until a preset time, wherein the method comprises the following steps:
The feedback sensor generates a turnover signal opposite to a signal mixed by a normally played music signal and an external noise sound wave to be overlapped, and temporarily absorbs the signal mixed by the normally played music signal and the external noise sound wave;
Translating the second signal function rightward in the coordinate system to obtain a fifth signal function, wherein the fifth signal function is a function of delay average preset time of the second signal function;
the feedback sensor outputs sound waves according to a fifth signal function.
A storage medium having stored thereon a computer readable program which when invoked performs the noise reduction method of the bluetooth headset noise reduction system described above.
Compared with the prior art, the invention has the beneficial effects that:
Through keeping synchronicity with the external noise sound wave and establishing the attenuation model from the feedback sensor to the noise reduction chip, the inverse signal for noise reduction and the external noise sound wave can be guaranteed to be consistent in the time dimension when noise is reduced, so that the inverse signal and the external noise sound wave can be offset mutually as thoroughly as possible when superposition is offset, meanwhile, the inverse signal is compensated and amplified by considering the attenuation condition from the feedback sensor to the noise reduction chip, so that the intensity of the inverse signal transmitted to the feedback sensor is consistent with that of the external noise sound wave, the inverse signal is offset mutually as thoroughly as possible, and external noise sound wave in the signal mixed by the normally played music signal and the external noise sound wave is completely removed, and accordingly the normally played music signal is obtained, and a headset user obtains good use experience.
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Fig. 1 is a schematic flow chart of a noise reduction method of a noise reduction system of a bluetooth headset according to the present invention;
FIG. 2 is a schematic flow chart of obtaining an external noise sound wave after subtracting a normally played music signal;
FIG. 3 is a schematic diagram of a reverse signal flow for generating a sound wave with opposite phase and same amplitude as an external noise sound wave according to the present invention;
FIG. 4 is a schematic diagram of the flow of the superposition cancellation of the sound wave signal and the external noise sound wave near the ear;
FIG. 5 is a schematic diagram of a flow for adjusting a transmission start point of a reverse signal and maintaining synchronism with an external noise sound wave by a feedback sensor according to the present invention;
FIG. 6 is a schematic diagram of a feedback sensor of the present invention absorbing a signal mixed by a normally played music signal and an external noise sound wave, and temporarily storing the signal mixed by the normally played music signal and the external noise sound wave to a preset time;
FIG. 7 is a schematic flow chart of the method for establishing the attenuation model from the feedback sensor to the noise reduction chip;
FIG. 8 is a schematic diagram of a compensation inversion signal flow according to the attenuation model of the present invention.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.
Referring to fig. 1, a noise reduction method of a noise reduction system of a bluetooth headset includes:
The microphone collects the signal of the mixture of the normally played music signal and the external noise sound wave, and the external noise sound wave is obtained after subtracting the normally played music signal;
analyzing, identifying, filtering and inverting the external noise sound wave to generate an inverted signal with opposite phase and same amplitude as the external noise sound wave;
The reverse signal is converted into an acoustic wave signal after being processed by the noise reduction chip, the acoustic wave signal and an external noise acoustic wave are sent out by the earphone loudspeaker, the acoustic wave signal and the external noise acoustic wave are overlapped and cancelled near the ear, and the external noise acoustic wave in the signal mixed by the normally played music signal and the external noise acoustic wave is cancelled, so that the normally played music signal is obtained;
the reverse signal is transmitted by a feedback sensor, and the feedback sensor adjusts the transmission starting point of the reverse signal and keeps synchronism with the external noise sound wave;
Establishing an attenuation model from the feedback sensor to the noise reduction chip, compensating the reverse signal according to the attenuation model, and transmitting the compensated reverse signal by the feedback sensor;
The noise reduction system has the following working processes:
the method comprises the steps that firstly, a microphone acquisition module acquires a signal of mixing a normally played music signal with an external noise sound wave;
the noise sound wave analysis module subtracts the normally played music signal to obtain an external noise sound wave, and analyzes, identifies, filters and inverts the external noise sound wave to generate an inverted signal with opposite phase and same amplitude as the external noise sound wave;
step three, a feedback sensor in the signal synchronization module adjusts a transmission starting point of a reverse signal and keeps synchronism with external noise sound waves;
The attenuation model building module builds an attenuation model from the feedback sensor to the noise reduction chip, and the signal strength compensation module compensates the reverse signal according to the attenuation model, and the feedback sensor transmits the compensated reverse signal;
And fifthly, the noise reduction processing module obtains a synchronous and compensated reverse signal, the reverse signal is converted into an acoustic wave signal after being processed by the noise reduction chip, the acoustic wave signal is sent out through the earphone loudspeaker, the acoustic wave signal and the external noise acoustic wave are overlapped and eliminated near the ears, and the external noise acoustic wave in the signal mixed by the normally played music signal and the external noise acoustic wave is counteracted, so that the normally played music signal is obtained.
Referring to fig. 2, subtracting the music signal normally played to obtain the external noise sound wave includes the following steps:
Capturing vibration of the earphone, identifying and obtaining a music signal transmitted by the earphone, and generating a first signal function of the music signal;
the microphone collects the signals of the music signals normally played and the external noise sound waves, identifies the mixed signals and generates a second signal function of the mixed signals;
And the second signal function and the first signal function are subjected to difference to obtain a third signal function of the external noise sound wave, and the external noise sound wave is obtained according to the third signal function.
The noise reduction system in the noise reduction method of the Bluetooth headset noise reduction system consists of a microphone acquisition module, a noise sound wave analysis module, a noise reduction processing module, an attenuation model building module, a signal intensity compensation module and a signal synchronization module;
The music signal is transmitted through the earphone, so that during transmission, the music signal can be directly captured by the inside of the earphone to obtain a first signal function, the microphone is used for collecting and obtaining a second signal function, and the second signal function is a mixed signal, so that the difference between the first signal function and the second signal function is used for obtaining a third signal function of an external noise sound wave, and therefore a reverse signal with the same amplitude and the opposite phase of the external noise sound wave can be generated.
Referring to fig. 3, generating an inverse signal of the same amplitude in phase with an external noise sound wave includes the steps of:
The separated external noise sound wave is obtained, the external noise sound wave is digitally processed and converted into an electric signal, sampling and quantization are carried out, and the sound wave function of the external noise sound wave is simulated according to the size of the electric signal;
collecting at least one amplitude of the acoustic wave function within a preset time range, and calculating the average value of all the amplitudes to obtain an identification amplitude;
Removing the part exceeding the identification amplitude in the acoustic wave function as an abnormal value, and replacing the abnormal value by using the identification amplitude to finish filtering the external noise acoustic wave;
making an image of the acoustic wave function, and symmetrically obtaining a new acoustic wave function about a transverse axis, converting the new acoustic wave function into an electric signal, and obtaining a reverse signal according to the size of the electric signal;
Because the images of the external noise sound waves are symmetrical about the transverse axis, when the sound waves which can be mutually offset after being overlapped with the external noise sound waves are found, the images of the external noise sound waves are symmetrical about the transverse axis, reverse signals are obtained, the values of the reverse signals at each point are opposite to the values of the corresponding points of the external noise sound waves, the reverse signals are overlapped to be zero, and therefore the reverse signals and the external noise sound waves are opposite in phase and same in amplitude.
Referring to fig. 4, the superposition cancellation of the acoustic wave signal and the external noise acoustic wave near the ear includes the steps of:
outputting sound wave signals near ears, and mixing the sound wave signals with the signals of the normally played music signals and the external noise sound waves;
And the fourth signal function of the sound wave signal and the third signal function doped in the mixed signal cancel each other out to obtain a normally played music signal.
Referring to fig. 5, the feedback sensor adjusts a transmission start point of a reverse signal, and maintains synchronism with an external noise sound wave, comprising the steps of:
The feedback sensor counts at least one preset time consumed by reverse signal generation, and average preset time is obtained by averaging the at least one preset time;
the feedback sensor absorbs the signal mixed by the normally played music signal and the external noise sound wave, and temporarily stores the signal mixed by the normally played music signal and the external noise sound wave to the average preset time;
when the average preset time is reached, the generated reverse signal is obtained, and the signal mixed by the normally played music signal and the external noise sound wave and the reverse signal are transmitted at the same transmission starting point.
Referring to fig. 6, the feedback sensor absorbs the signal mixed by the music signal and the external noise sound wave, and temporarily stores the signal mixed by the music signal and the external noise sound wave until a preset time, the method includes the following steps:
The feedback sensor generates a turnover signal opposite to a signal mixed by a normally played music signal and an external noise sound wave to be overlapped, and temporarily absorbs the signal mixed by the normally played music signal and the external noise sound wave;
Translating the second signal function rightward in the coordinate system to obtain a fifth signal function, wherein the fifth signal function is a function of delay average preset time of the second signal function;
The feedback sensor outputs sound waves according to a fifth signal function;
the synchronization with the external noise sound wave is maintained because if no adjustment is made, the external noise sound wave is directly transmitted without waiting time due to the time required for generating the reverse signal, and is directly overlapped and offset, and the external noise sound wave and the reverse signal can generate tiny offset, and the offset can cause insufficient offset between the external noise sound wave and the reverse signal, namely, partial external noise sound wave remains, and the music signal which is normally played is influenced, so that when the synchronization adjustment is made, the signal which is mixed by the music signal which is normally played and the external noise sound wave is absorbed, and the signal which is mixed by the music signal which is normally played and the external noise sound wave is output after the average preset time is equal to the time required for generating the reverse signal, and therefore, the synchronization of the external noise sound wave and the reverse signal can be ensured, and the reverse signal can offset the external noise sound wave in the signal which is mixed by the normal play music signal and the external noise sound wave, and the music signal which is normally played is obtained.
Referring to fig. 7, the method for establishing the attenuation model from the feedback sensor to the noise reduction chip includes the following steps:
Acquiring at least one first sound wave intensity of different external noise sound waves captured at a feedback sensor, and acquiring at least one second sound wave intensity of different external noise sound waves at a noise reduction chip;
corresponding the first sound wave intensity and the second sound wave intensity, and pairing the first sound wave intensity and the second sound wave intensity into an array;
Conducting dotting on at least one group of first sound wave intensity and second sound wave intensity in a coordinate system, and selecting a function model for simulation according to an image obtained by dotting;
and fitting according to the selected function model to obtain a fitting function of the attenuation model.
Referring to fig. 8, according to the attenuation model, compensating the reverse signal includes the steps of:
obtaining a fitting function of the attenuation model, and obtaining third sound wave intensity of the external noise sound waves collected by the feedback sensor;
in the fitting function, taking the third sound wave intensity as a value after attenuation, and obtaining fourth sound wave intensity before attenuation corresponding to the third sound wave intensity;
Compensating the sound wave intensity of the reverse signal after noise reduction to fourth sound wave intensity;
According to the fitting function of the attenuation model, the fourth sound wave intensity is attenuated to the third sound wave intensity when being transmitted to the feedback sensor, so that the intensity of the reverse signal is the third sound wave intensity, and after the average preset time, the external noise sound wave is also transmitted by the feedback sensor, and the external noise sound wave is also the third sound wave intensity, so that the intensity is consistent, and the intensity is mutually offset at the feedback sensor, so that the music signal which is normally played is obtained.
A storage medium having stored thereon a computer readable program which when invoked performs the noise reduction method of the bluetooth headset noise reduction system described above.
Still further, the present disclosure also provides a storage medium having a computer readable program stored thereon, where the computer readable program executes the noise reduction method of the bluetooth headset noise reduction system described above when called.
It is understood that the storage medium may be a magnetic medium such as a floppy disk, a hard disk, a magnetic tape, an optical medium such as a DVD, or a semiconductor medium such as a solid state disk SolidStateDisk, SSD, etc.
In summary, the invention has the advantages that the synchronization with the external noise sound wave is maintained, and the attenuation model from the feedback sensor to the noise reduction chip is established, so that the inverse signal for noise reduction and the external noise sound wave are kept consistent in the time dimension during noise reduction, and can be offset mutually as thoroughly as possible during superposition offset, meanwhile, the inverse signal is compensated and amplified by considering the attenuation condition from the feedback sensor to the noise reduction chip, so that the intensity of the inverse signal transmitted to the feedback sensor is consistent with that of the external noise sound wave, and the inverse signal is offset mutually as thoroughly as possible, and the external noise sound wave in the signal mixed by the normally played music signal and the external noise sound wave is completely removed, so that the normally played music signal is obtained, and a good using experience is obtained for an earphone user.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A noise reduction method for a noise reduction system of a bluetooth headset, comprising:
The microphone collects the signal of the mixture of the normally played music signal and the external noise sound wave, and the external noise sound wave is obtained after subtracting the normally played music signal;
analyzing, identifying, filtering and inverting the external noise sound wave to generate an inverted signal with opposite phase and same amplitude as the external noise sound wave;
The reverse signal is converted into an acoustic wave signal after being processed by the noise reduction chip, the acoustic wave signal and an external noise acoustic wave are sent out by the earphone loudspeaker, the acoustic wave signal and the external noise acoustic wave are overlapped and cancelled near the ear, and the external noise acoustic wave in the signal mixed by the normally played music signal and the external noise acoustic wave is cancelled, so that the normally played music signal is obtained;
the reverse signal is transmitted by a feedback sensor, and the feedback sensor adjusts the transmission starting point of the reverse signal and keeps synchronism with the external noise sound wave;
establishing an attenuation model from the feedback sensor to the noise reduction chip;
compensating the reverse signal according to the attenuation model;
the feedback sensor transmits the compensated reverse signal;
the method for establishing the attenuation model from the feedback sensor to the noise reduction chip comprises the following steps of:
Acquiring at least one first sound wave intensity of different external noise sound waves captured at a feedback sensor, and acquiring at least one second sound wave intensity of different external noise sound waves at a noise reduction chip;
corresponding the first sound wave intensity and the second sound wave intensity, and pairing the first sound wave intensity and the second sound wave intensity into an array;
Conducting dotting on at least one group of first sound wave intensity and second sound wave intensity in a coordinate system, and selecting a function model for simulation according to an image obtained by dotting;
fitting according to the selected function model to obtain a fitting function of the attenuation model;
wherein compensating the inverse signal according to the attenuation model comprises the steps of:
obtaining a fitting function of the attenuation model, and obtaining third sound wave intensity of the external noise sound waves collected by the feedback sensor;
in the fitting function, taking the third sound wave intensity as a value after attenuation, and obtaining fourth sound wave intensity before attenuation corresponding to the third sound wave intensity;
And compensating the sound wave intensity of the reverse signal after noise reduction to fourth sound wave intensity.
2. The noise reduction method of a noise reduction system of a bluetooth headset according to claim 1, wherein the subtracting the music signal normally played to obtain the external noise sound wave comprises the following steps:
Capturing vibration of the earphone, identifying and obtaining a music signal transmitted by the earphone, and generating a first signal function of the music signal;
the microphone collects the signals of the music signals normally played and the external noise sound waves, identifies the mixed signals and generates a second signal function of the mixed signals;
And the second signal function and the first signal function are subjected to difference to obtain a third signal function of the external noise sound wave, and the external noise sound wave is obtained according to the third signal function.
3. The noise reduction method of a noise reduction system of a bluetooth headset according to claim 2, wherein the generating of the reverse signal of the same amplitude in phase with the sound wave of the external noise comprises the steps of:
The method comprises the steps of obtaining separated external noise sound waves, carrying out digital processing on the external noise sound waves, converting the external noise sound waves into electric signals during digital processing, sampling and quantizing, and simulating an acoustic function of the external noise sound waves according to the size of the electric signals;
collecting at least one amplitude of the acoustic wave function within a preset time range, and calculating the average value of all the amplitudes to obtain an identification amplitude;
Removing the part exceeding the identification amplitude in the acoustic wave function as an abnormal value, and replacing the abnormal value by using the identification amplitude to finish filtering the external noise acoustic wave;
And (3) making an image of the acoustic wave function, and carrying out symmetry on the image about a transverse axis to obtain a new acoustic wave function, converting the new acoustic wave function into an electric signal, and obtaining a reverse signal according to the size of the electric signal.
4. A noise reduction method of a noise reduction system of a bluetooth headset according to claim 3, wherein the superposition cancellation of the sound wave signal and the external noise sound wave in the vicinity of the ear comprises the steps of:
outputting sound wave signals near ears, and mixing the sound wave signals with the signals of the normally played music signals and the external noise sound waves;
And the fourth signal function of the sound wave signal and the third signal function in the mixed signal cancel each other out to obtain a normally played music signal.
5. The noise reduction method of a noise reduction system of a bluetooth headset according to claim 4, wherein the feedback sensor adjusts a transmission start point of a reverse signal, and maintains synchronization with an external noise sound wave, comprising the steps of:
The feedback sensor counts at least one preset time consumed by reverse signal generation, and average preset time is obtained by taking an average value of the at least one preset time;
the feedback sensor absorbs the signal mixed by the normally played music signal and the external noise sound wave, and temporarily stores the signal mixed by the normally played music signal and the external noise sound wave to the average preset time;
when the average preset time is reached, the generated reverse signal is obtained, and the signal mixed by the normally played music signal and the external noise sound wave and the reverse signal are transmitted at the same transmission starting point.
6. A storage medium having a computer readable program stored thereon, wherein the computer readable program when invoked performs the noise reduction method of the bluetooth headset noise reduction system according to any one of claims 1-5.
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| CN100531450C (en) * | 2005-03-22 | 2009-08-19 | 东莞理工学院 | Feedback Active Noise Canceling Headphones |
| CN102300140B (en) * | 2011-08-10 | 2013-12-18 | 歌尔声学股份有限公司 | Speech enhancing method and device of communication earphone and noise reduction communication earphone |
| US20180025719A1 (en) * | 2015-02-09 | 2018-01-25 | Shenzhen Aerospace Golden Shine Technology Co., Ltd | Low-Power-Consumption Active Noise-Reduction In-Ear Music Earphone and Method for Noise Reduction |
| CN111565343A (en) * | 2020-05-18 | 2020-08-21 | 歌尔科技有限公司 | Audio compensation method, system and device for digital noise reduction and earphone |
| CN114928785B (en) * | 2022-04-28 | 2025-01-21 | 歌尔股份有限公司 | Feedback noise reduction method and device for earphone device, earphone device and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113596661A (en) * | 2021-07-28 | 2021-11-02 | 维沃移动通信有限公司 | Earphone, feedback noise reduction method and device |
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