Noise reduction method and storage medium for Bluetooth headset noise reduction system

Abstract

The invention discloses a noise reduction method and storage medium of a Bluetooth headset noise reduction system, and relates to the field of acoustic technology, including: a microphone collects a signal of a normally played music signal mixed with residual noise, and obtains residual external noise sound waves after subtracting the normally played music signal; generates a reverse signal with the opposite phase and the same amplitude as the external noise sound wave; after the reverse signal is processed by a noise reduction chip, the sound wave signal and the external noise sound wave are superimposed and cancelled near the ear to obtain a normally played music signal; the reverse signal is transmitted by a feedback sensor, and the feedback sensor adjusts the transmission starting point of the reverse signal; an attenuation model from the feedback sensor to the noise reduction chip is established, and the reverse signal is compensated according to the attenuation model. By maintaining synchronization with the external noise sound wave and establishing an attenuation model from the feedback sensor to the noise reduction chip, the normally played music signal is obtained, so that the headset user has a good use experience.

Description

Technical Field

[0001] The present invention relates to the field of acoustic technology, and in particular to a noise reduction method and a storage medium for a Bluetooth headset noise reduction system. Background Art

[0002] As terminals, especially mobile terminals and Bluetooth functions, become more and more popular, and the technology becomes more and more mature, the application of Bluetooth headsets is becoming more and more extensive. At present, there are two methods for Bluetooth headset noise reduction: active noise reduction and passive noise reduction. The active noise reduction function is to generate reverse sound waves equal to the external noise through the noise reduction system to neutralize the noise, thereby achieving the effect of noise reduction. Active noise reduction headphones have noise reduction circuits that counteract external noise. Most of them adopt a larger head-mounted design, which can use earplug cotton and earphone shells to block external noise for the first round of sound insulation, and also to have sufficient space to install active noise reduction circuits and power supplies. Passive noise reduction headphones mainly form a closed space by surrounding the ears, or use sound insulation materials such as silicone earplugs to block external noise. Since the noise is not processed by the noise reduction circuit chip, it can generally only block high-frequency noise, and the noise reduction effect on low-frequency noise is not obvious.

[0003] The existing noise reduction methods lack the synchronization control of the reverse signal for eliminating noise and the noise. The time difference between the two will lead to insufficient noise reduction effect. In addition, when outputting the reverse signal, the attenuation of the sound wave is not considered. When the reverse signal reaches the noise reduction position, its intensity is inconsistent with the noise intensity, which will affect the noise reduction effect. Summary of the invention

[0004] In order to solve the above technical problems, a noise reduction method and storage medium for a Bluetooth headset noise reduction system are provided. The technical solution solves the problem that the existing noise reduction method proposed in the above background technology lacks synchronization control between the reverse signal for eliminating noise and the noise, and the time difference between the two will lead to insufficient noise reduction effect. In addition, when the reverse signal is output, the attenuation of the sound wave is not considered. When the reverse signal reaches the noise reduction position, its intensity is inconsistent with the noise intensity, which will affect the noise reduction effect.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A noise reduction method for a Bluetooth headset noise reduction system, comprising:

[0007] The microphone collects a signal mixed with the normally played music signal and the external noise sound wave, and obtains the external noise sound wave after subtracting the normally played music signal;

[0008] Analyze, identify, filter and invert the external noise sound waves to generate a reverse signal with the opposite phase and the same amplitude as the external noise sound waves;

[0009] After being processed by the noise reduction chip, the reverse signal is converted into a sound wave signal and sent out through the headphone speaker. The sound wave signal and the external noise sound wave are superimposed and canceled near the ear. The external noise sound wave in the signal mixed with the normal music signal is canceled out, and the normal music signal is obtained.

[0010] The reverse signal is transmitted by the feedback sensor, which adjusts the transmission starting point of the reverse signal to keep synchronization with the external noise sound wave;

[0011] Establish an attenuation model from the feedback sensor to the noise reduction chip;

[0012] The establishment of the attenuation model from the feedback sensor to the noise reduction chip comprises the following steps:

[0013] Acquire at least one first sound wave intensity of different external noise sound waves captured at the feedback sensor, and obtain at least one second sound wave intensity of different external noise sound waves at the noise reduction chip;

[0014] Match the first sound wave intensity with the second sound wave intensity and pair them into an array;

[0015] Plotting points for at least one set 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 plotting points;

[0016] According to the selected function model, the fitting function of the attenuation model is obtained by fitting;

[0017] According to the attenuation model, the reverse signal is compensated;

[0018] According to the attenuation model, compensating the reverse signal comprises the following steps:

[0019] Obtaining a fitting function of the attenuation model, and obtaining the third sound wave intensity of the external noise sound wave collected by the feedback sensor;

[0020] In the fitting function, the third sound wave intensity is taken as the value after attenuation, and the fourth sound wave intensity before attenuation corresponding to the third sound wave intensity is obtained;

[0021] Compensating the sound wave intensity of the noise-reduced reverse signal to the fourth sound wave intensity;

[0022] The feedback sensor transmits a compensated reverse signal.

[0023] Preferably, the step of obtaining the external noise sound wave by subtracting the normally played music signal comprises the following steps:

[0024] Capturing the vibration of the earphone itself, identifying the music signal transmitted by the earphone, and generating a first signal function of the music signal;

[0025] The microphone collects a signal mixed with a normally played music signal and an external noise sound wave, identifies the mixed signal, and generates a second signal function of the mixed signal;

[0026] The third signal function of the external noise sound wave is obtained by subtracting the second signal function from the first signal function, and the external noise sound wave is obtained according to the third signal function.

[0027] Preferably, generating a reverse signal with an opposite phase and the same amplitude as the external noise sound wave comprises the following steps:

[0028] The separated external noise sound wave is obtained, the external noise sound wave is digitized, converted into an electrical signal, sampled and quantized, and the sound wave function of the external noise sound wave is simulated according to the size of the electrical signal;

[0029] Within a preset time range, at least one amplitude of the sound wave function is collected, and the mean of all amplitudes is calculated to obtain an identified amplitude;

[0030] For the part of the sound wave function that exceeds the recognition amplitude, it is removed as an outlier and replaced with the recognition amplitude to complete the filtering of the external noise sound wave;

[0031] Make an image of the sound wave function, symmetrize it about the horizontal axis, obtain a new sound wave function, convert the new sound wave function into an electrical signal, and obtain a reverse signal based on the size of the electrical signal.

[0032] Preferably, the superposition and cancellation of the sound wave signal and the external noise sound wave near the ear comprises the following steps:

[0033] Output the sound wave signal near the ear and mix it with the signal mixed with the normally played music signal and the external noise sound wave;

[0034] The fourth signal function of the sound wave signal and the third signal function mixed in the mixed signal cancel each other out, and a normally played music signal is obtained.

[0035] Preferably, the feedback sensor adjusts the transmission starting point of the reverse signal to keep synchronization with the external noise sound wave, including the following steps:

[0036] The feedback sensor counts at least one preset time consumed in generating the reverse signal, and averages the at least one preset time to obtain an average preset time;

[0037] The feedback sensor absorbs the signal mixed with the normal playing music signal and the external noise sound wave, and temporarily stores the signal mixed with the normal playing music signal and the external noise sound wave for an average preset time;

[0038] When the average preset time is reached, the generated reverse signal is obtained, and the signal mixed with the normally played music signal and the external noise sound wave is transmitted with the reverse signal at the same transmission starting point.

[0039] Preferably, the feedback sensor absorbs the signal of the normal music signal and the external noise sound wave, and temporarily stores the signal of the normal music signal and the external noise sound wave for a preset time, which includes the following steps:

[0040] The feedback sensor generates a flip signal opposite to the signal mixed with the normal music signal and the external noise sound wave, and superimposes the signal, temporarily absorbing the signal mixed with the normal music signal and the external noise sound wave;

[0041] The second signal function is translated rightward in the coordinate system to obtain a fifth signal function, where the fifth signal function is a function of the second signal function delayed by an average preset time;

[0042] The feedback sensor outputs a sound wave according to a fifth signal function.

[0043] A storage medium stores a computer-readable program, which executes the noise reduction method of the Bluetooth headset noise reduction system when called.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] By maintaining synchronization with the external noise sound waves and establishing an attenuation model from the feedback sensor to the noise reduction chip, it is possible to ensure that the reverse signal used for noise reduction is consistent with the external noise sound waves in the time dimension during noise reduction, so that the two can cancel each other out as thoroughly as possible when superimposed and offset. At the same time, taking into account the attenuation from the feedback sensor to the noise reduction chip, the reverse signal is compensated and amplified so that the intensity of the reverse signal when transmitted to the feedback sensor is consistent with that of the external noise sound waves, so that they can cancel each other out as thoroughly as possible, thereby ensuring that the external noise sound waves in the signal mixed with the normally played music signal and the external noise sound waves can be completely removed, thereby obtaining the normally played music signal and allowing the headphone users to have a good user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A schematic diagram of a noise reduction method flow of a Bluetooth headset noise reduction system of the present invention;

[0047] Figure 2 This is a schematic diagram of the process of obtaining the external noise sound wave after subtracting the normally played music signal of the present invention;

[0048] Figure 3 It is a schematic diagram of the process of generating a reverse signal with a phase opposite to that of the external noise sound wave and the same amplitude according to the present invention;

[0049] Figure 4 It is a schematic diagram of the process of superposition and cancellation of the sound wave signal and the external noise sound wave near the ear of the present invention;

[0050] Figure 5 A schematic diagram of a flow chart of adjusting the transmission starting point of a reverse signal of the feedback sensor of the present invention to keep synchronization with external noise sound waves;

[0051] Figure 6 A schematic diagram of a flow chart showing that the feedback sensor of the present invention absorbs a signal mixed with a normally played music signal and an external noise sound wave, and temporarily stores the signal mixed with the normally played music signal and the external noise sound wave for a preset time;

[0052] Figure 7 A schematic diagram of the process of establishing an attenuation model from a feedback sensor to a noise reduction chip according to the present invention;

[0053] Figure 8 The figure is a flow chart of compensating reverse signals according to the attenuation model of the present invention. DETAILED DESCRIPTION

[0054] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0055] Reference Figure 1 As shown, a noise reduction method of a Bluetooth headset noise reduction system includes:

[0056] The microphone collects a signal mixed with the normally played music signal and the external noise sound wave, and obtains the external noise sound wave after subtracting the normally played music signal;

[0057] Analyze, identify, filter and invert the external noise sound waves to generate a reverse signal with the opposite phase and the same amplitude as the external noise sound waves;

[0058] After being processed by the noise reduction chip, the reverse signal is converted into a sound wave signal and sent out through the headphone speaker. The sound wave signal and the external noise sound wave are superimposed and canceled near the ear. The external noise sound wave in the signal mixed with the normal music signal is canceled out, and the normal music signal is obtained.

[0059] The reverse signal is transmitted by the feedback sensor, which adjusts the transmission starting point of the reverse signal to keep synchronization with the external noise sound wave;

[0060] An attenuation model from the feedback sensor to the noise reduction chip is established, and the reverse signal is compensated according to the attenuation model, and the feedback sensor transmits the compensated reverse signal;

[0061] The working process of the above noise reduction system is as follows:

[0062] Step 1: The microphone acquisition module collects a signal mixed with the normally played music signal and the external noise sound wave;

[0063] Step 2: The noise sound wave analysis module subtracts the normally played music signal to obtain the external noise sound wave. The noise sound wave analysis module analyzes, identifies, filters and inverts the external noise sound wave to generate a reverse signal with the opposite phase and the same amplitude as the external noise sound wave.

[0064] Step 3: The feedback sensor in the signal synchronization module adjusts the transmission starting point of the reverse signal to keep synchronization with the external noise sound wave;

[0065] Step 4: The attenuation model establishment module establishes an attenuation model from the feedback sensor to the noise reduction chip, the signal strength compensation module compensates the reverse signal according to the attenuation model, and the feedback sensor transmits the compensated reverse signal;

[0066] Step 5: The noise reduction processing module obtains the reverse signal after synchronization and compensation. After being processed by the noise reduction chip, the reverse signal is converted into a sound wave signal and emitted through the headphone speaker. The sound wave signal and the external noise sound wave are superimposed and canceled out near the ear. The external noise sound wave in the signal mixed with the normally played music signal and the external noise sound wave is canceled out to obtain a normally played music signal.

[0067] Reference Figure 2 As shown, after subtracting the normally played music signal, obtaining the external noise sound wave includes the following steps:

[0068] Capturing the vibration of the earphone itself, identifying the music signal transmitted by the earphone, and generating a first signal function of the music signal;

[0069] The microphone collects a signal mixed with a normally played music signal and an external noise sound wave, identifies the mixed signal, and generates a second signal function of the mixed signal;

[0070] The third signal function of the external noise sound wave is obtained by subtracting the second signal function from the first signal function, and the external noise sound wave is obtained according to the third signal function.

[0071] The noise reduction system in the noise reduction method of the Bluetooth headset noise reduction system is composed of a microphone acquisition module, a noise sound wave analysis module, a noise reduction processing module, an attenuation model establishment module, a signal strength compensation module and a signal synchronization module;

[0072] The music signal is transmitted through the earphone. Therefore, during transmission, it can be directly captured inside the earphone to obtain the first signal function, and the second signal function is collected at the microphone. The second signal function is a mixed signal. Therefore, the difference between the two is used to obtain the third signal function of the external noise sound wave. In this way, a reverse signal with the opposite phase and the same amplitude as the external noise sound wave can be generated.

[0073] Reference Figure 3 As shown, generating a reverse signal with the opposite phase and the same amplitude as the external noise sound wave includes the following steps:

[0074] The separated external noise sound wave is obtained, the external noise sound wave is digitized, converted into an electrical signal, sampled and quantized, and the sound wave function of the external noise sound wave is simulated according to the size of the electrical signal;

[0075] Within a preset time range, at least one amplitude of the sound wave function is collected, and the mean of all amplitudes is calculated to obtain an identified amplitude;

[0076] For the part of the sound wave function that exceeds the recognition amplitude, it is removed as an outlier and replaced with the recognition amplitude to complete the filtering of the external noise sound wave;

[0077] Make an image of the sound wave function, symmetric it about the horizontal axis, obtain a new sound wave function, convert the new sound wave function into an electrical signal, and obtain a reverse signal according to the size of the electrical signal;

[0078] Since the image of the external noise sound wave is symmetrical about the horizontal axis, when looking for the sound wave that can cancel each other out after superposition with the external noise sound wave, the image of the external noise sound wave is symmetrical about the horizontal axis to obtain a reverse signal. The value of the reverse signal at each point is the opposite of the value of the corresponding point of the external noise sound wave. Therefore, the superposition of the two is zero. Therefore, the reverse signal has an opposite phase and the same amplitude as the external noise sound wave.

[0079] Reference Figure 4 As shown, the superposition and cancellation of the sound wave signal and the external noise sound wave near the ear includes the following steps:

[0080] Output the sound wave signal near the ear and mix it with the signal mixed with the normally played music signal and the external noise sound wave;

[0081] The fourth signal function of the sound wave signal and the third signal function mixed in the mixed signal cancel each other out, and a normally played music signal is obtained.

[0082] Reference Figure 5 As shown, the feedback sensor adjusts the transmission starting point of the reverse signal to keep synchronization with the external noise sound wave, including the following steps:

[0083] The feedback sensor counts at least one preset time consumed in generating the reverse signal, and averages the at least one preset time to obtain an average preset time;

[0084] The feedback sensor absorbs the signal mixed with the normal playing music signal and the external noise sound wave, and temporarily stores the signal mixed with the normal playing music signal and the external noise sound wave for an average preset time;

[0085] When the average preset time is reached, the generated reverse signal is obtained, and the signal mixed with the normally played music signal and the external noise sound wave is transmitted with the reverse signal at the same transmission starting point.

[0086] Reference Figure 6 As shown, the feedback sensor absorbs the signal mixed with the normally played music signal and the external noise sound wave, and temporarily stores the signal mixed with the normally played music signal and the external noise sound wave for a preset time, including the following steps:

[0087] The feedback sensor generates a flip signal opposite to the signal mixed with the normal music signal and the external noise sound wave, and superimposes the signal, temporarily absorbing the signal mixed with the normal music signal and the external noise sound wave;

[0088] The second signal function is translated rightward in the coordinate system to obtain a fifth signal function, where the fifth signal function is a function of the second signal function delayed by an average preset time;

[0089] The feedback sensor outputs a sound wave according to a fifth signal function;

[0090] The reason for maintaining synchronization with the external noise sound waves is that if no adjustment is made, the reverse signal takes time to generate, while the external noise sound waves propagate directly without waiting time, and are directly superimposed and canceled. There will be a slight misalignment between the external noise sound waves and the reverse signal. These misalignments will cause the external noise sound waves and the reverse signal to cancel each other insufficiently, that is, some external noise sound waves will remain and will affect the normally played music signal. Therefore, when making synchronization adjustments, the signal mixed with the normally played music signal and the external noise sound wave is absorbed, and after an average preset time, the signal mixed with the normally played music signal and the external noise sound wave is output, wherein the average preset time is the time required for the reverse signal to be generated. Therefore, the synchronization between the external noise sound wave and the reverse signal can be guaranteed, so that the reverse signal can cancel the external noise sound wave in the signal mixed with the normally played music signal and the external noise sound wave to obtain a normally played music signal.

[0091] Reference Figure 7 As shown, establishing the attenuation model from the feedback sensor to the noise reduction chip includes the following steps:

[0092] Acquire at least one first sound wave intensity of different external noise sound waves captured at the feedback sensor, and obtain at least one second sound wave intensity of different external noise sound waves at the noise reduction chip;

[0093] Match the first sound wave intensity with the second sound wave intensity and pair them into an array;

[0094] Plotting points for at least one set 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 plotting points;

[0095] According to the selected function model, the fitting function of the attenuation model is obtained by fitting.

[0096] Reference Figure 8 As shown, according to the attenuation model, compensating the reverse signal includes the following steps:

[0097] Obtaining a fitting function of the attenuation model, and obtaining the third sound wave intensity of the external noise sound wave collected by the feedback sensor;

[0098] In the fitting function, the third sound wave intensity is taken as the value after attenuation, and the fourth sound wave intensity before attenuation corresponding to the third sound wave intensity is obtained;

[0099] Compensating the sound wave intensity of the noise-reduced reverse signal to the fourth sound wave intensity;

[0100] According to the fitting function of the attenuation model, the fourth sound wave intensity will attenuate to the third sound wave intensity when it is transmitted to the feedback sensor. Therefore, the intensity of the reverse signal is the third sound wave intensity. After the average preset time, the external noise sound wave will also be transmitted by the feedback sensor, and the external noise sound wave is also the third sound wave intensity. Therefore, since the two have the same intensity, they will cancel each other out at the feedback sensor and obtain a normal music signal.

[0101] A storage medium stores a computer-readable program, which executes the noise reduction method of the Bluetooth headset noise reduction system when called.

[0102] Furthermore, the present solution also proposes a storage medium on which a computer-readable program is stored. When the computer-readable program is called, the noise reduction method of the Bluetooth headset noise reduction system is executed.

[0103] It is understandable that the storage medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; an optical medium, such as a DVD; or a semiconductor medium, such as a solid state drive (SSD).

[0104] To sum up, the advantages of the present invention are: by maintaining synchronization with the external noise sound waves and establishing an attenuation model from the feedback sensor to the noise reduction chip, it is possible to ensure that the reverse signal used for noise reduction is consistent with the external noise sound waves in the time dimension during noise reduction, so that when the two are superimposed and offset, they can offset each other as thoroughly as possible. At the same time, considering the attenuation of the feedback sensor to the noise reduction chip, the reverse signal is compensated and amplified, so that the reverse signal is consistent with the intensity of the external noise sound waves when transmitted to the feedback sensor, so as to offset each other as thoroughly as possible, thereby ensuring that the external noise sound waves in the signal mixed with the normally played music signal and the external noise sound waves can be completely removed, thereby obtaining the normally played music signal, so that the headphone user has a good user experience.

[0105] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A noise reduction method for a Bluetooth headset noise reduction system, characterized in that: include: The microphone collects a signal mixed with the normally played music signal and the external noise sound wave, and obtains the external noise sound wave after subtracting the normally played music signal; Analyze, identify, filter and invert the external noise sound waves to generate a reverse signal with the opposite phase and the same amplitude as the external noise sound waves; After being processed by the noise reduction chip, the reverse signal is converted into a sound wave signal and sent out through the headphone speaker. The sound wave signal and the external noise sound wave are superimposed and canceled near the ear. The external noise sound wave in the signal mixed with the normal music signal is canceled out, and the normal music signal is obtained. The reverse signal is transmitted by the feedback sensor, which adjusts the transmission starting point of the reverse signal to keep synchronization with the external noise sound wave; Establish an attenuation model from the feedback sensor to the noise reduction chip; According to the attenuation model, the reverse signal is compensated; The feedback sensor transmits a compensated reverse signal; Among them, establishing the attenuation model from the feedback sensor to the noise reduction chip includes the following steps: Acquire at least one first sound wave intensity of different external noise sound waves captured at the feedback sensor, and obtain at least one second sound wave intensity of different external noise sound waves at the noise reduction chip; Match the first sound wave intensity with the second sound wave intensity and pair them into an array; Plotting points for at least one set 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 plotting points; According to the selected function model, the fitting function of the attenuation model is obtained by fitting; According to the attenuation model, compensating the reverse signal includes the following steps: Obtaining a fitting function of the attenuation model, and obtaining the third sound wave intensity of the external noise sound wave collected by the feedback sensor; In the fitting function, the third sound wave intensity is taken as the value after attenuation, and the fourth sound wave intensity before attenuation corresponding to the third sound wave intensity is obtained; The sound wave intensity of the reverse signal after noise reduction is compensated to the fourth sound wave intensity.

2. The noise reduction method of a Bluetooth headset noise reduction system according to claim 1, characterized in that: The step of obtaining the external noise sound wave after subtracting the normally played music signal comprises the following steps: Capturing the vibration of the earphone itself, identifying the music signal transmitted by the earphone, and generating a first signal function of the music signal; The microphone collects a signal mixed with a normally played music signal and an external noise sound wave, identifies the mixed signal, and generates a second signal function of the mixed signal; The third signal function of the external noise sound wave is obtained by subtracting the second signal function from the first signal function, and the external noise sound wave is obtained according to the third signal function.

3. The noise reduction method of a Bluetooth headset noise reduction system according to claim 2, characterized in that: The generating of a reverse signal having an opposite phase and the same amplitude as the external noise sound wave comprises the following steps: The separated external noise sound wave is obtained, and the external noise sound wave is digitally processed. During the digital processing, the external noise sound wave is converted into an electrical signal, sampled and quantized, and the sound wave function of the external noise sound wave is simulated according to the size of the electrical signal; Within a preset time range, at least one amplitude of the sound wave function is collected, and the mean of all amplitudes is calculated to obtain an identified amplitude; For the part of the sound wave function that exceeds the recognition amplitude, it is removed as an outlier and replaced with the recognition amplitude to complete the filtering of the external noise sound wave; Make an image of the sound wave function, symmetrize it about the horizontal axis, obtain a new sound wave function, convert the new sound wave function into an electrical signal, and obtain a reverse signal based on the size of the electrical signal.

4. The noise reduction method of a Bluetooth headset noise reduction system according to claim 3, characterized in that: The superposition and cancellation of the sound wave signal and the external noise sound wave near the ear comprises the following steps: Output the sound wave signal near the ear and mix it with the signal mixed with the normally played music signal and the external noise sound wave; The fourth signal function of the sound wave signal and the third signal function in the mixed signal cancel each other out, thereby obtaining a normally played music signal.

5. The noise reduction method of a Bluetooth headset noise reduction system according to claim 4, characterized in that: The feedback sensor adjusts the transmission starting point of the reverse signal to keep synchronization with the external noise sound wave, including the following steps: The feedback sensor counts at least one preset time consumed in generating the reverse signal, and averages the at least one preset time to obtain an average preset time; The feedback sensor absorbs the signal mixed with the normal playing music signal and the external noise sound wave, and temporarily stores the signal mixed with the normal playing music signal and the external noise sound wave for an average preset time; When the average preset time is reached, the generated reverse signal is obtained, and the signal mixed with the normally played music signal and the external noise sound wave is transmitted with the reverse signal at the same transmission starting point.

6. A storage medium having a computer-readable program stored thereon, characterized in that: When the computer-readable program is called, the noise reduction method of the Bluetooth headset noise reduction system according to any one of claims 1 to 5 is executed.

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