Feedback noise reduction method and device for earphone device, earphone device and storage medium

Abstract

The present invention discloses a feedback noise reduction method, device, headphone device and computer-readable storage medium for headphone equipment. The method is applied to a headphone device with an ultrasonic speaker configured internally, comprising: transmitting an ultrasonic signal through the ultrasonic speaker to perform distance measurement to calculate the distance parameters between the microphone, ultrasonic speaker and preset human ear tympanic membrane inside the headphone device; calculating the loudness attenuation parameters of the sound signal of the headphone device according to the distance parameters; compensating the cancellation signal output by the ultrasonic speaker according to the loudness attenuation parameters to perform feedback noise reduction of the headphone device. The present invention can correct the large difference between the reverse cancellation signal emitted by the speaker caused by the distance between the speaker, the microphone and the user's ear tympanic membrane and the noise signal actually received by the human ear tympanic membrane, thereby effectively improving the feedback noise reduction effect of the headphone device.

Description

Technical Field

[0001] The present invention relates to the field of earphone technology, and in particular to a feedback noise reduction method and device for an earphone device, an earphone device, and a computer-readable storage medium. Background Art

[0002] Nowadays, smart headphones have been widely popularized in the market, especially those with active noise reduction function, which have attracted the attention and popularity of many market users. The more important component of the active noise reduction function of headphones is feedback noise reduction. Figure 3 In the application scenario shown, feedback noise reduction is generally to set a microphone inside the headset to record the noise at the human ear, then modify the phase of the noise through a filter, and then emit reverse sound waves with opposite phases and equal amplitudes through the speaker of the headset to cancel the noise.

[0003] However, the above-mentioned feedback noise reduction requires that the distance between the microphone collecting noise and the eardrum and the speaker is as close as possible, so as to ensure to a large extent that the intensity of the reverse cancellation signal emitted by the speaker is consistent with the intensity of the noise signal originally reaching the human ear. However, since the diaphragm of the speaker in the existing headphone device vibrates when working, a certain space must be reserved between the speaker and the microphone, that is, the microphone cannot be infinitely close to the speaker; at the same time, the microphone itself, as a component inside the headphone device, cannot be infinitely close to the eardrum when the user uses the headphone device normally. In this way, there is a certain distance between the microphone, the eardrum and the speaker, which leads to a certain difference between the noise signal received by the microphone and the noise signal actually received by the eardrum. Furthermore, there is naturally a large difference between the reverse cancellation signal emitted by the speaker based on the noise collected by the microphone and the noise signal received by the eardrum.

[0004] In summary, during the feedback noise reduction process of existing headphone devices with active noise reduction function, due to the distance between the speaker, microphone and human eardrum in the headphone device, there will be a large difference between the cancellation signal emitted by the speaker and the noise signal received by the human eardrum, resulting in poor noise reduction effect. Summary of the invention

[0005] The main purpose of the present invention is to provide a feedback noise reduction method, device, headphone device and computer-readable storage medium for a headphone device, aiming to correct the large difference between the reverse cancellation signal emitted by the speaker and the noise signal actually received by the human eardrum caused by a certain distance between the speaker, microphone and user's eardrum in the headphone device, thereby effectively improving the feedback noise reduction effect of the headphone device.

[0006] To achieve the above object, the present invention provides a feedback noise reduction method for an earphone device, wherein the feedback noise reduction method for an earphone device is applied to an earphone device having an ultrasonic speaker configured therein, and the method comprises:

[0007] The ultrasonic speaker emits an ultrasonic signal to perform distance measurement, so as to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and a preset human eardrum;

[0008] Calculate a loudness attenuation parameter of a sound signal transmitted through the earphone device according to the distance parameter;

[0009] The cancellation signal output by the ultrasonic speaker is compensated according to the loudness attenuation parameter to perform feedback noise reduction on the headphone device.

[0010] Optionally, the loudness attenuation parameter of the sound signal of the headphone device includes: the loudness attenuation amount of the sound transmitted by the ultrasonic speaker to the microphone, and the loudness loss amount of the sound transmitted by the ultrasonic speaker to the preset human ear drum;

[0011] The step of compensating the cancellation signal output by the ultrasonic speaker according to the loudness attenuation parameter to perform feedback noise reduction on the headphone device comprises:

[0012] Compensating for propagation loss of the cancellation signal output by the ultrasonic speaker according to the loudness attenuation amount, and compensating for loudness loss of the cancellation signal output by the ultrasonic speaker according to the loudness loss amount;

[0013] The noise reduction compensation amount of the cancellation signal output by the ultrasonic speaker is determined according to the compensated propagation loss and the loudness loss, and the ultrasonic speaker outputs the cancellation signal according to the noise reduction compensation amount to perform feedback noise reduction on the headphone device.

[0014] Optionally, the loudness attenuation parameter of the sound signal transmitted by the headphone device includes: a loudness attenuation amount of the sound transmitted by the ultrasonic speaker to the microphone, and the step of calculating the loudness attenuation parameter of the sound signal transmitted by the headphone device according to the distance parameter includes:

[0015] Simulating the propagation condition of the sound signal according to the distance parameter and the preset angle parameter;

[0016] Outputting a sound signal based on the propagation condition in a preset simulated human ear environment to perform a propagation test;

[0017] The loudness attenuation of the sound transmitted from the ultrasonic speaker to the microphone is calculated based on the propagation test.

[0018] Optionally, the loudness attenuation parameter of the sound signal of the earphone device includes: the loudness loss amount of the sound propagated by the ultrasonic speaker to the preset human ear drum, and the step of calculating the loudness attenuation parameter of the sound signal propagated by the earphone device according to the distance parameter further includes:

[0019] In the propagation test, a first intensity of the sound signal received by the microphone is detected, and a second intensity of the sound signal received by the preset human eardrum is detected;

[0020] The loudness loss amount of the sound transmitted by the ultrasonic speaker to the preset human ear drum is calculated according to the first intensity and the second intensity.

[0021] Optionally, the preset human ear tympanic membrane includes: a human ear tympanic membrane in a simulated human ear and a tympanic membrane of an actual user's ear;

[0022] The step of transmitting an ultrasonic signal through the ultrasonic speaker to perform distance measurement to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and a preset human eardrum comprises:

[0023] When it is determined that the earphone device is worn on the simulated human ear, the ultrasonic speaker emits an ultrasonic signal to perform distance measurement to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and the eardrum of the human ear;

[0024] Alternatively, when it is determined that the headphone device is worn on the ear of the actual user, the ultrasonic signal is emitted by the ultrasonic speaker to perform distance measurement to calculate the distance parameters between the microphone inside the headphone device, the ultrasonic speaker and the eardrum of the ear of the actual user.

[0025] Optionally, the step of calculating and obtaining distance parameters between a microphone inside the earphone device, the ultrasonic speaker, and a preset human eardrum comprises:

[0026] In the distance measurement, the angle information of the ultrasonic speaker emitting the ultrasonic signal is detected, and the first time information of the ultrasonic signal being transmitted to the microphone after being reflected by the preset human eardrum is detected;

[0027] The distance parameters between the microphone, the ultrasonic speaker and the preset human ear membrane are calculated according to the angle information, the first time information and the second time information when the ultrasonic signal is directly transmitted to the microphone.

[0028] Optionally, the method further comprises:

[0029] The ultrasonic speaker emits an ultrasonic signal to adjust the angle of the ultrasonic speaker, and based on the ultrasonic speaker after the angle adjustment, the step of measuring the distance by emitting an ultrasonic signal through the ultrasonic speaker is performed to obtain the distance parameters between the microphone inside the headphone device, the ultrasonic speaker and a preset human eardrum.

[0030] To achieve the above object, the present invention further provides a feedback noise reduction device for an earphone device, wherein the feedback noise reduction device for an earphone device is applied to an earphone device having an ultrasonic speaker configured therein, and the device comprises:

[0031] A distance measurement module, used for measuring the distance by transmitting an ultrasonic signal through the ultrasonic speaker, so as to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and a preset human eardrum;

[0032] an attenuation calculation module, used to calculate a loudness attenuation parameter of a sound signal transmitted through the earphone device according to the distance parameter;

[0033] The noise reduction module is used to compensate the cancellation signal output by the ultrasonic speaker according to the loudness attenuation parameter to perform feedback noise reduction of the headphone device.

[0034] Each functional module of the feedback noise reduction device of the headphone device of the present invention implements the steps of the feedback noise reduction method of the headphone device described above when running.

[0035] To achieve the above-mentioned purpose, the present invention also provides an earphone device, comprising: a memory, a processor, and a feedback noise reduction program of the earphone device stored in the memory and executable on the processor, wherein the feedback noise reduction program of the earphone device, when executed by the processor, implements the steps of the feedback noise reduction method of the earphone device as described above.

[0036] In addition, to achieve the above-mentioned purpose, the present invention also proposes a computer-readable storage medium, on which a feedback noise reduction program of a headphone device is stored. When the feedback noise reduction program of the headphone device is executed by a processor, the steps of the feedback noise reduction method of the headphone device as described above are implemented.

[0037] In the present invention, in the feedback noise reduction link of the headphone device in active noise reduction, first, an ultrasonic signal is emitted by an ultrasonic speaker configured inside the headphone device to perform distance measurement, so as to calculate the distance parameters among the microphone inside the headphone device, the ultrasonic speaker and the preset human ear drum based on the distance measurement; then, the headphone device further calculates the loudness attenuation parameter of the sound signal propagating the headphone device according to the distance parameter; finally, the cancellation signal output by the ultrasonic speaker is compensated according to the loudness attenuation parameter, so as to perform feedback noise reduction of the headphone device for the noise received by the preset human ear drum.

[0038] Compared with the feedback noise reduction method of traditional headphone devices, the present invention configures an ultrasonic speaker inside the headphone device to emit an ultrasonic signal for distance measurement, thereby determining the loudness attenuation parameter of the sound signal propagating the current headphone device based on the measured distance between the ultrasonic speaker, the microphone and the human ear drum, so as to compensate the ultrasonic speaker for the cancellation signal of the noise signal received by the human ear drum based on the loudness attenuation parameter. In this way, the present invention can achieve real-time measurement of the distance parameters between the ultrasonic speaker, the microphone and the human ear drum by configuring an ultrasonic speaker inside the headphone device, so as to correct the large difference between the reverse cancellation signal emitted by the speaker caused by the distance between the speaker, the microphone and the user's ear drum based on the measured distance parameter and the noise signal actually received by the human ear drum, thereby effectively improving the feedback noise reduction effect of the headphone device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of a flow chart of an embodiment of a feedback noise reduction method for an earphone device of the present invention;

[0040] Figure 2 A schematic diagram of an application scenario of feedback noise reduction in the technical background of the feedback noise reduction method of the headphone device of the present invention;

[0041] Figure 3 A schematic diagram of an application scenario of distance measurement through an ultrasonic speaker according to an embodiment of a feedback noise reduction method for an earphone device of the present invention;

[0042] Figure 4 A schematic diagram of an application scenario of a compensation cancellation signal involved in an embodiment of a feedback noise reduction method for an earphone device of the present invention;

[0043] Figure 5 It is a schematic diagram of functional modules of a preferred embodiment of the feedback noise reduction device of the headphone device of the present invention.

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0046] Reference Figure 1 , Figure 1 It is a flow chart of a first embodiment of a feedback noise reduction method for a headphone device of the present invention.

[0047] The embodiment of the present invention provides an embodiment of a feedback noise reduction method for an earphone device. It should be noted that although a logical order is shown in the flow chart, in some cases, the steps shown or described may be performed in an order different from that shown here.

[0048] In this embodiment, the feedback noise reduction method of the headphone device provided by the present invention can be specifically applied to a headphone device configured with an ultrasonic speaker inside. The feedback noise reduction method of the headphone device of the present invention includes:

[0049] Step S10: transmitting an ultrasonic signal through the ultrasonic speaker to perform distance measurement, so as to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and a preset human eardrum;

[0050] In this embodiment, when the headphone device is started to run and execute the active noise reduction function, in the feedback noise reduction link, one or more ultrasonic signals are emitted through the internally configured ultrasonic speaker to perform a distance measurement operation, thereby calculating the distance parameters between the ultrasonic speaker, the microphone in the headphone device, and the preset human eardrum based on the relevant parameters of the distance measurement.

[0051] It should be noted that, in the present embodiment, the microphone in the headphone device can specifically be a feedback noise reduction microphone. In addition, the preset human ear tympanic membrane includes: a human ear tympanic membrane in a simulated human ear and a tympanic membrane of an actual user's ear. That is, when the headphone device is worn on an artificially made simulated human ear to perform a simulation test, the headphone device transmits an ultrasonic signal through an ultrasonic speaker to perform distance measurement to obtain the distance parameters between the ultrasonic speaker, the microphone in the headphone device, and the human ear tympanic membrane in the simulated human ear, or, when the headphone device is worn on the ear of an actual user for related debugging before active noise reduction, the headphone device transmits an ultrasonic signal through an ultrasonic speaker to perform distance measurement to obtain the distance parameters between the ultrasonic speaker, the microphone in the headphone device, and the tympanic membrane of the actual user's ear.

[0052] Based on this, in some feasible embodiments, the above step S10 may include:

[0053] Step S101: when it is determined that the earphone device is worn on the simulated human ear, the ultrasonic speaker emits an ultrasonic signal to perform distance measurement to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and the eardrum of the human ear;

[0054] In this embodiment, the headphone device can specifically determine whether it is currently worn on an artificially made simulated human ear through the pre-configured temperature sensor and axial acceleration sensor, that is, the headphone device determines that it is currently in a standard wearing posture through the acceleration data in the three axial directions of X-axis, Y-axis and Z-axis collected by the axial acceleration sensor, but does not receive the temperature data transmitted by the temperature sensor when the temperature of the object contacted by the outer surface of the headphone device is in the standard temperature range of the human body. The headphone device then determines that it is currently worn on the simulated human ear. After that, the headphone device controls the ultrasonic speaker configured internally to emit one or more ultrasonic signals to perform distance measurement, thereby calculating the distance parameters between the ultrasonic speaker, the microphone in the headphone device, and the human ear drum in the simulated human ear based on the relevant parameters of the distance measurement.

[0055] Alternatively, in some other feasible embodiments, the above step S10 may further include:

[0056] Step S102: When it is determined that the earphone device is worn on the ear of the actual user, the ultrasonic speaker emits an ultrasonic signal to perform distance measurement to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and the eardrum of the ear of the actual user.

[0057] In this embodiment, when the earphone device determines that it is currently in a standard wearing posture through the acceleration data in the three axial directions of X-axis, Y-axis and Z-axis collected by the axial acceleration sensor, and simultaneously receives the temperature data transmitted by the temperature sensor when the temperature of the object in contact with the outer surface of the earphone device is in the standard temperature range of the human body, the earphone device determines that it is currently worn on the ear of the actual user. Thereafter, the earphone device controls the ultrasonic speaker configured internally to emit one or more ultrasonic signals to perform distance measurement, thereby calculating the distance parameters among the ultrasonic speaker, the microphone in the earphone device, and the eardrum of the actual user's ear based on the relevant parameters of the distance measurement.

[0058] It should be noted that, in this embodiment, the headphone device is internally configured with an ultrasonic speaker with a wider frequency band. Thus, based on the high frequency characteristics of ultrasonic waves and the relationship between wavelength λ and the speed of sound and the frequency of sound waves f, λ=c / f, it can be known that, when the speed of sound c is constant, the higher the frequency f, the shorter the wavelength λ of the sound wave will be. Therefore, when the wavelength of the ultrasonic wave is very short and is within the scale range of the headphone device, the ultrasonic wave will have a strong directivity, so that it can be approximately considered that the ultrasonic wave propagates along a straight line within the scale range of the headphone device. Furthermore, the headphone device can calculate the distance of the obstacle (i.e., the eardrum) in front of the ultrasonic speaker through the angle of ultrasonic wave propagation and the time it takes for the ultrasonic wave to be reflected back after reaching the object (passing through the ear canal to reach the eardrum) and being received by the microphone.

[0059] Based on this, in this embodiment and some feasible embodiments described below, in the above step S10, the step of calculating the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and the preset human ear drum may specifically include:

[0060] Step A: In the distance measurement, detecting the angle information of the ultrasonic speaker emitting the ultrasonic signal, and detecting the first time information of the ultrasonic signal being transmitted to the microphone after being reflected by the preset human eardrum;

[0061] In this embodiment, if Figure 3 In the application scenario shown, when the earphone device transmits an ultrasonic signal through an internal ultrasonic speaker to perform distance measurement, the earphone device immediately detects the angle information of the ultrasonic signal transmitted by the ultrasonic speaker after the ultrasonic speaker transmits the ultrasonic signal, and detects the first time information experienced by the ultrasonic signal after being transmitted by the ultrasonic speaker, passing through the ear canal to reach the eardrum, and being reflected from the eardrum when the microphone receives the ultrasonic signal.

[0062] Step B: Calculate the distance parameters between the microphone, the ultrasonic speaker and the preset human ear membrane according to the angle information, the first time information and the second time information when the ultrasonic signal is directly transmitted to the microphone.

[0063] In this embodiment, if Figure 3In the application scenario shown, after the headphone device detects the sound speed, angle information and first time information of the propagation of the ultrasonic signal emitted by the ultrasonic speaker during the distance measurement process through the ultrasonic speaker, the headphone device further calculates the distance between the ultrasonic speaker and the microphone, the distance between the microphone and the eardrum of the human ear, and the distance between the ultrasonic speaker and the eardrum of the human ear based on the angle information and the first time information, as well as the second time information from the emission of another ultrasonic signal to the receipt of the other ultrasonic signal by the ultrasonic speaker directly to the microphone.

[0064] It should be noted that, in some feasible embodiments, the headphone device can also directly obtain the distance between the ultrasonic speaker and the microphone. It should be understood that in the actual production process of the headphone device, the design parameters of the installation position and spacing distance between the various components in the headphone device will be marked by the headphone device development and design staff. In this way, the headphone device can obtain the design parameters and then parse the distance between the ultrasonic speaker and the microphone from the design parameters.

[0065] Step S20: calculating a loudness attenuation parameter of the sound signal transmitted through the earphone device according to the distance parameter;

[0066] In this embodiment, after the headphone device transmits an ultrasonic signal through an ultrasonic speaker to perform distance measurement and thereby calculates the distance parameters among the ultrasonic speaker, the microphone in the headphone device and the preset human eardrum, the operation of a propagation test is further simulated based on the distance parameters to calculate the loudness attenuation parameters of the sound signal emitted by the headphone device during the propagation process.

[0067] Further, in some feasible embodiments, the loudness attenuation parameter of the sound signal transmitted from the earphone device may specifically include: the loudness attenuation amount of the sound transmitted from the ultrasonic speaker to the microphone. Step S20 may specifically include:

[0068] Step S201: simulating the propagation condition of the sound signal according to the distance parameter and the preset angle parameter;

[0069] Step S202: outputting a sound signal based on the propagation condition in a preset simulated human ear environment to perform a propagation test;

[0070] Step S203: Calculate the loudness attenuation of the sound transmitted from the ultrasonic speaker to the microphone based on the propagation test.

[0071] It should be noted that, in the present embodiment, the preset angle parameter can specifically be the angle at which the ultrasonic speaker in the headphone device emits the ultrasonic signal. In addition, the preset simulated human ear environment can specifically be an application scenario in which the headphone device is worn on an artificially made simulated human ear to perform a simulation test. It should be understood that when the headphone device is worn on the ear of an actual user to perform a related debugging scenario of feedback noise reduction, the preset simulated human ear environment can naturally be replaced by the adjustment scenario, that is, the headphone device can be based on the distance parameter after measuring the distance parameters between the above-mentioned ultrasonic speaker, microphone and human eardrum, and calculate the loudness attenuation parameter of the sound signal emitted by the headphone device during the propagation process based on the distance parameter alone based on an application scenario for performing a simulation test, or, of course, the headphone device can also directly calculate the loudness attenuation parameter based on the distance parameter in real time in the related debugging scenario of feedback noise reduction currently performed on the ear of the actual user.

[0072] In this embodiment, after the earphone device transmits an ultrasonic signal through an ultrasonic speaker to perform distance measurement and calculates the distance parameters between the ultrasonic speaker, the microphone in the earphone device and the preset human ear drum, the earphone device simulates the propagation conditions for the sound signal emitted by the earphone device in the preset simulated human ear environment according to the distance parameter determined in each distance measurement and the angle selected for the ultrasonic speaker to transmit the ultrasonic signal (the distance parameter and the selected angle are different each time). After that, the earphone device immediately outputs the sound signal in the preset simulated human ear environment according to the simulated propagation conditions through the ultrasonic speaker to perform a propagation test, so that the earphone device can calculate the loudness attenuation amount pn1 of the sound signal emitted by the earphone device in the process of propagating to the microphone based on the loudness data of multiple groups of sound signals detected in the propagation test (each group of loudness data includes: the loudness of the sound signal output by the ultrasonic speaker and the loudness of the sound signal received by the microphone).

[0073] Further, in some feasible embodiments, the loudness attenuation parameter of the sound signal transmitted by the earphone device may specifically include: the loudness loss amount of the sound transmitted by the ultrasonic speaker to the preset human eardrum. Step S20 may specifically include:

[0074] Step S204: in the propagation test, detecting a first strength of the sound signal received by the microphone, and detecting a second strength of the sound signal received by the preset human eardrum;

[0075] In this embodiment, while the headphone device simulates the propagation conditions through the above-mentioned distance parameters and angle parameters, and thereby outputs the sound signal through the ultrasonic speaker according to the simulated propagation conditions in a preset simulated human ear environment for a propagation test, it also synchronously detects a first intensity of the sound signal output by the headphone device through the ultrasonic speaker and received by the microphone in the headphone device, and detects a second intensity of the sound signal received by the human ear drum in the preset simulated human ear environment.

[0076] Step S205: Calculate the loudness loss of the sound transmitted by the ultrasonic speaker to the preset human ear membrane according to the first intensity and the second intensity.

[0077] In this embodiment, after detecting the first intensity of the sound signal received by the microphone and the second intensity of the sound signal received by the human ear drum in a preset simulated human ear environment, the headphone device immediately calculates the sound signal intensity difference pn2 between the first intensity and the second intensity as the loudness loss amount of the ultrasonic speaker propagating the sound to the preset human ear drum.

[0078] It should be noted that, in this embodiment, the headphone device simulates and tests the loudness attenuation pn1 of the sound signal propagation between the ultrasonic speaker and the microphone under different angles and distances in the simulated human ear environment, and then simulates the intensity difference pn2 between the sound signal received by the microphone and the sound signal received by the human ear tympanic membrane under different distances and angles in the simulated human ear environment, so that the loudness attenuation pn1 and the intensity difference pn2 can be used to compensate for the attenuation of the sound signal loudness output by the ultrasonic speaker to the microphone and the human ear tympanic membrane of the headphone device under various distances and angles. Specifically, the headphone device can store the loudness attenuation pn1 and the intensity difference pn2 in the database circuit, so that when the headphone device is worn on the ear of an actual user to perform active noise reduction, the above-mentioned two data can be extracted from the database circuit during the feedback noise reduction link to compensate for the attenuation of the sound signal loudness output by the ultrasonic speaker to the microphone and the human ear tympanic membrane.

[0079] Step S30: compensating the cancellation signal output by the ultrasonic speaker according to the loudness attenuation parameter to perform feedback noise reduction of the headphone device.

[0080] In this embodiment, after the headphone device simulates the operation of the propagation test according to the above-mentioned distance parameter to calculate the loudness attenuation parameter of the sound signal emitted by the headphone device during the propagation process, the feedback noise reduction link can be executed to compensate the cancellation signal output by the ultrasonic speaker according to the loudness attenuation parameter, thereby performing feedback noise reduction of the headphone device for the noise received by the preset human eardrum.

[0081] It should be noted that, in this embodiment, the cancellation signal output by the ultrasonic speaker can specifically be: an acoustic signal output by the ultrasonic speaker that reversely cancels the noise signal collected by the microphone in the headphone device, namely the feedback noise reduction microphone. It should be understood that, in this embodiment, the headphone device can specifically generate an acoustic signal for reversely canceling the noise signal by adjusting parameters such as phase and amplitude of the noise signal collected by the feedback noise reduction microphone in the headphone device.

[0082] Furthermore, in some feasible embodiments, the above step S30 may include:

[0083] Step S301: compensating for the propagation loss of the cancellation signal output by the ultrasonic speaker according to the loudness attenuation amount, and compensating for the loudness loss of the cancellation signal output by the ultrasonic speaker according to the loudness loss amount;

[0084] In this embodiment, when the headphone device compensates the cancellation signal output by the ultrasonic speaker according to the loudness attenuation parameter during the feedback noise reduction link, it first compensates for the propagation loss of the cancellation signal output by the ultrasonic speaker according to the loudness attenuation amount of the sound signal propagated by the headphone device in the loudness attenuation parameter, and then compensates for the loudness loss of the cancellation signal output by the ultrasonic speaker according to the loudness loss amount of the ultrasonic speaker propagating the sound to the preset human ear drum in the loudness attenuation parameter.

[0085] Step S302: determining a noise reduction compensation amount of the cancellation signal output by the ultrasonic speaker according to the compensated propagation loss and the loudness loss, and performing feedback noise reduction of the headphone device by outputting the cancellation signal according to the noise reduction compensation amount through the ultrasonic speaker.

[0086] like Figure 4 In the application scenario shown, the headphone device can specifically compensate for the sound intensity loss of the cancellation signal output by the ultrasonic speaker during the propagation process by means of the loudness attenuation pn1 and the intensity difference pn2 previously stored in the database circuit. That is, firstly compensate the loudness attenuation value p1 caused by the propagation distance and angle between the ultrasonic speaker and the microphone according to the loudness attenuation pn1, and then compensate the sound loudness loss value -p2 caused by the distance difference between the microphone and the eardrum of the human ear according to the intensity difference pn2. In this way, the noise reduction compensation amount pt of the cancellation signal for feedback noise reduction transmitted to the ultrasonic speaker by the headphone device during the feedback noise reduction link is: pt=p1+p2. In this way, the headphone device can perform feedback noise reduction on the noise signal by using the cancellation signal having substantially the same amplitude as the noise signal after compensation after compensating the cancellation signal output by the ultrasonic speaker according to the noise reduction compensation amount pt each time the noise signal is received by the feedback microphone and feedback noise reduction is performed on the noise signal.

[0087] It should be noted that, in this embodiment, when the earphone device is worn on a simulated human ear or an actual user's ear to start the movement, the noise signal first reaches the microphone of the earphone device and then reaches the eardrum of the human ear. Therefore, the noise signal received by the eardrum of the human ear is actually smaller in intensity than the noise signal received by the microphone, so the compensation amount of its loudness should be a negative value.

[0088] In this embodiment, when the headphone device is started and the active noise reduction function is executed, in the feedback noise reduction link, one or more ultrasonic signals are emitted by the internally configured ultrasonic speaker to perform the distance measurement operation, so as to calculate the distance parameters between the ultrasonic speaker, the microphone in the headphone device, and the preset human ear drum based on the relevant parameters of the distance measurement. Afterwards, the headphone device further simulates the operation of the propagation test according to the distance parameter to calculate the loudness attenuation parameter of the sound signal emitted by the headphone device during the propagation process. Finally, when executing the feedback noise reduction link, the headphone device can compensate the cancellation signal output by the ultrasonic speaker according to the loudness attenuation parameter, so as to perform feedback noise reduction of the headphone device for the noise received by the preset human ear drum.

[0089] Compared with the feedback noise reduction method of traditional headphone devices, the present invention configures an ultrasonic speaker inside the headphone device to emit an ultrasonic signal for distance measurement, thereby determining the loudness attenuation parameter of the sound signal propagating the current headphone device based on the measured distance between the ultrasonic speaker, the microphone and the human ear drum, so as to compensate the ultrasonic speaker for the cancellation signal of the noise signal received by the human ear drum based on the loudness attenuation parameter. In this way, the present invention can achieve real-time measurement of the distance parameters between the ultrasonic speaker, the microphone and the human ear drum by configuring an ultrasonic speaker inside the headphone device, so as to correct the large difference between the reverse cancellation signal emitted by the speaker caused by the distance between the speaker, the microphone and the user's ear drum based on the measured distance parameter and the noise signal actually received by the human ear drum, thereby effectively improving the feedback noise reduction effect of the headphone device.

[0090] Furthermore, based on the first embodiment of the feedback noise reduction method for the headphone device of the present invention, a second embodiment of the feedback noise reduction method for the headphone device of the present invention is proposed.

[0091] In this embodiment, the feedback noise reduction method of the headphone device of the present invention may further include:

[0092] Step C: adjusting the angle of the ultrasonic speaker by emitting an ultrasonic signal through the ultrasonic speaker, and based on the ultrasonic speaker after the angle adjustment, performing the step of measuring the distance by emitting an ultrasonic signal through the ultrasonic speaker to obtain the distance parameters between the microphone inside the headphone device, the ultrasonic speaker and a preset human eardrum.

[0093] In this embodiment, after the earphone device is determined to be worn on a simulated human ear or an actual user's ear, before starting the operation of transmitting an ultrasonic signal through the ultrasonic speaker to measure the distance, the ultrasonic speaker is first used to transmit an ultrasonic signal to adjust the angle of the ultrasonic speaker, that is, the angle of the ultrasonic speaker is adjusted to the ultrasonic signal transmitted by the ultrasonic speaker to be transmitted to the eardrum of the human ear in a straight line, and further reflected from the eardrum of the human ear to the microphone in a straight line. Afterwards, the earphone device performs the process defined in the above step S10 by the ultrasonic speaker after the angle adjustment to transmit the ultrasonic signal to measure the distance and thereby calculate the distance parameters between the ultrasonic speaker, the microphone and the eardrum of the human ear.

[0094] In this embodiment, taking into account that the earphone device may have certain differences in the structure of the ears of different users during use, in order to avoid the problem that the headphone device may not be effective in feedback noise reduction due to the differences, when the headphone device is determined to be matched with the actual user, the headphone device can also adjust the angle at which the ultrasonic speaker transmits the ultrasonic signal to accurately measure the distance parameters between the ultrasonic speaker, the microphone and the human eardrum in advance. In the subsequent feedback noise reduction process, the cancellation signal for the noise signal can be compensated based on the accurate distance parameters, thereby ensuring the feedback noise reduction effect of the headphone device.

[0095] In addition, the embodiment of the present invention also provides a feedback noise reduction device for an earphone device, please refer to Figure 5 The feedback noise reduction device of the earphone device of the present invention is applied to an earphone device with an ultrasonic speaker configured inside, comprising:

[0096] The distance measuring module 10 is used to measure the distance by transmitting an ultrasonic signal through the ultrasonic speaker, so as to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and a preset human eardrum;

[0097] An attenuation calculation module 20, configured to calculate a loudness attenuation parameter of a sound signal transmitted through the earphone device according to the distance parameter;

[0098] The noise reduction module 30 is used to compensate the cancellation signal output by the ultrasonic speaker according to the loudness attenuation parameter to perform feedback noise reduction of the headphone device.

[0099] Optionally, the loudness attenuation parameter of the sound signal of the headphone device includes: the loudness attenuation amount of the sound transmitted by the ultrasonic speaker to the microphone, and the loudness loss amount of the sound transmitted by the ultrasonic speaker to the preset human ear drum;

[0100] The noise reduction module 30 of the feedback noise reduction device of the headphone device of the present invention comprises:

[0101] a compensation unit, configured to compensate for a propagation loss of a cancellation signal output by the ultrasonic speaker according to the loudness attenuation amount, and to compensate for a loudness loss of a cancellation signal output by the ultrasonic speaker according to the loudness loss amount;

[0102] The noise reduction execution unit is used to determine the noise reduction compensation amount of the cancellation signal output by the ultrasonic speaker according to the compensated propagation loss and the loudness loss, and output the cancellation signal according to the noise reduction compensation amount through the ultrasonic speaker to perform feedback noise reduction of the headphone device.

[0103] Optionally, the loudness attenuation parameter of the sound signal transmitted by the headphone device includes: the loudness attenuation amount of the sound transmitted by the ultrasonic speaker to the microphone. The attenuation calculation module 20 of the feedback noise reduction device of the headphone device of the present invention includes:

[0104] A condition simulation unit, used to simulate the propagation condition of the sound signal according to the distance parameter and the preset angle parameter;

[0105] A testing unit, configured to output a sound signal based on the propagation condition in a preset simulated human ear environment to perform a propagation test;

[0106] The first attenuation calculation unit is used to calculate the loudness attenuation of the sound transmitted from the ultrasonic speaker to the microphone based on the propagation test.

[0107] Optionally, the loudness attenuation parameter of the sound signal transmitted by the headphone device includes: the loudness loss amount of the sound transmitted by the ultrasonic speaker to the preset human ear drum. The attenuation calculation module 20 of the feedback noise reduction device of the headphone device of the present invention further includes:

[0108] A first detection unit, used for detecting a first strength of the sound signal received by the microphone and a second strength of the sound signal received by the preset human eardrum in the propagation test;

[0109] The second attenuation calculation unit is used to calculate the loudness loss of the sound transmitted by the ultrasonic speaker to the preset human ear drum according to the first intensity and the second intensity.

[0110] Optionally, the preset human ear drum includes: a human ear drum in a simulated human ear and a drum of an actual user's ear. The distance measurement module 10 of the feedback noise reduction device of the headphone device of the present invention includes:

[0111] a first distance measuring unit, configured to, when determining that the earphone device is worn on the simulated human ear, transmit an ultrasonic signal through the ultrasonic speaker to perform distance measurement, so as to calculate distance parameters between the microphone inside the earphone device, the ultrasonic speaker and the eardrum of the human ear;

[0112] The second distance measuring unit is used to measure the distance by transmitting an ultrasonic signal through the ultrasonic speaker when it is determined that the earphone device is worn on the ear of the actual user, so as to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and the eardrum of the ear of the actual user.

[0113] Optionally, the distance measuring module 10 of the feedback noise reduction device of the headphone device of the present invention further includes:

[0114] A second detection unit is used to detect angle information of the ultrasonic speaker emitting the ultrasonic signal and first time information of the ultrasonic signal being transmitted to the microphone after being reflected by the preset human eardrum during the distance measurement;

[0115] The distance calculation unit is used to calculate the distance parameters between the microphone, the ultrasonic speaker and the preset human ear drum according to the angle information, the first time information and the second time information when the ultrasonic signal is directly transmitted to the microphone.

[0116] Optionally, the ranging module 10 of the feedback noise reduction device of the headphone device of the present invention is also used to transmit an ultrasonic signal through the ultrasonic speaker to adjust the angle of the ultrasonic speaker, and based on the ultrasonic speaker after the angle adjustment, execute the step of transmitting an ultrasonic signal through the ultrasonic speaker to measure the distance, so as to obtain the distance parameters between the microphone inside the headphone device, the ultrasonic speaker and a preset human ear drum.

[0117] The extended contents of the specific implementation manner of the feedback noise reduction device of the headphone device of the present invention are basically the same as the various embodiments of the feedback noise reduction method of the headphone device mentioned above, and will not be elaborated here.

[0118] In addition, an embodiment of the present invention further provides an earphone device, which includes a structural housing, a communication module, a main control module (such as a microcontroller unit MCU), an ultrasonic speaker, a feedback noise reduction microphone, a memory, etc. The main control module may include a microprocessor, an audio decoding unit, a power supply and a power management unit, sensors required by the system, and other active or passive devices (which may be replaced, deleted, or added according to actual functions) to realize the reception and playback functions of wireless audio.

[0119] The memory of the headphone device of the present invention may store a feedback noise reduction program of the headphone device, and the feedback noise reduction program of the headphone device may be called by a microprocessor in the headphone device and perform the following operations:

[0120] The ultrasonic speaker emits an ultrasonic signal to perform distance measurement, so as to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and a preset human eardrum;

[0121] Calculate a loudness attenuation parameter of a sound signal transmitted through the earphone device according to the distance parameter;

[0122] The cancellation signal output by the ultrasonic speaker is compensated according to the loudness attenuation parameter to perform feedback noise reduction on the headphone device.

[0123] Optionally, the loudness attenuation parameter of the sound signal of the headphone device includes: the loudness attenuation amount of the sound transmitted by the ultrasonic speaker to the microphone, and the loudness loss amount of the sound transmitted by the ultrasonic speaker to the preset human ear drum; the feedback noise reduction program of the headphone device can be called by a microprocessor in the headphone device to further perform the following operations:

[0124] Compensating for propagation loss of the cancellation signal output by the ultrasonic speaker according to the loudness attenuation amount, and compensating for loudness loss of the cancellation signal output by the ultrasonic speaker according to the loudness loss amount;

[0125] The noise reduction compensation amount of the cancellation signal output by the ultrasonic speaker is determined according to the compensated propagation loss and the loudness loss, and the ultrasonic speaker outputs the cancellation signal according to the noise reduction compensation amount to perform feedback noise reduction on the headphone device.

[0126] Optionally, the feedback noise reduction program of the headphone device may be called by a microprocessor in the headphone device to further perform the following operations:

[0127] Simulating the propagation condition of the sound signal according to the distance parameter and the preset angle parameter;

[0128] Outputting a sound signal based on the propagation condition in a preset simulated human ear environment to perform a propagation test;

[0129] The loudness attenuation of the sound transmitted from the ultrasonic speaker to the microphone is calculated based on the propagation test.

[0130] Optionally, the feedback noise reduction program of the headphone device may be called by a microprocessor in the headphone device to further perform the following operations:

[0131] In the propagation test, a first intensity of the sound signal received by the microphone is detected, and a second intensity of the sound signal received by the preset human eardrum is detected;

[0132] The loudness loss amount of the sound transmitted by the ultrasonic speaker to the preset human ear drum is calculated according to the first intensity and the second intensity.

[0133] Optionally, the preset human ear drum includes: a human ear drum in a simulated human ear and an ear drum of an actual user's ear. The feedback noise reduction program of the headphone device can be called by a microprocessor in the headphone device to further perform the following operations:

[0134] When it is determined that the earphone device is worn on the simulated human ear, the ultrasonic speaker emits an ultrasonic signal to perform distance measurement to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and the eardrum of the human ear;

[0135] Alternatively, when it is determined that the headphone device is worn on the ear of the actual user, the ultrasonic signal is emitted by the ultrasonic speaker to perform distance measurement to calculate the distance parameters between the microphone inside the headphone device, the ultrasonic speaker and the eardrum of the ear of the actual user.

[0136] Optionally, the feedback noise reduction program of the headphone device may be called by a microprocessor in the headphone device to further perform the following operations:

[0137] In the distance measurement, the angle information of the ultrasonic speaker emitting the ultrasonic signal is detected, and the first time information of the ultrasonic signal being transmitted to the microphone after being reflected by the preset human eardrum is detected;

[0138] The distance parameters between the microphone, the ultrasonic speaker and the preset human ear membrane are calculated according to the angle information, the first time information and the second time information when the ultrasonic signal is directly transmitted to the microphone.

[0139] Optionally, the feedback noise reduction program of the headphone device may be called by a microprocessor in the headphone device to further perform the following operations:

[0140] The ultrasonic speaker emits an ultrasonic signal to adjust the angle of the ultrasonic speaker, and based on the ultrasonic speaker after the angle adjustment, the step of measuring the distance by emitting an ultrasonic signal through the ultrasonic speaker is performed to obtain the distance parameters between the microphone inside the headphone device, the ultrasonic speaker and a preset human eardrum.

[0141] In addition, the present invention also proposes a computer-readable storage medium, on which a feedback noise reduction program for a headphone device is stored. When the feedback noise reduction program for the headphone device is executed by a processor, the steps of the feedback noise reduction method for the headphone device of the present invention as described above are implemented.

[0142] The various embodiments of the headphone device and the computer-readable storage medium of the present invention may all refer to the various embodiments of the feedback noise reduction method of the headphone device of the present invention, which will not be described in detail here.

[0143] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0144] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0145] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a headset device, a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0146] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A feedback noise reduction method for an earphone device, characterized in that: The feedback noise reduction method of the headphone device is applied to a headphone device configured with an ultrasonic speaker inside, and the method comprises: The ultrasonic speaker emits an ultrasonic signal to perform distance measurement, so as to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and a preset human eardrum; Calculate a loudness attenuation parameter of a sound signal transmitted through the earphone device according to the distance parameter; The loudness attenuation parameter of the sound signal transmitted by the headphone device includes: the loudness attenuation amount of the sound transmitted by the ultrasonic speaker to the microphone, and the step of calculating the loudness attenuation parameter of the sound signal transmitted by the headphone device according to the distance parameter includes: Simulating the propagation condition of the sound signal according to the distance parameter and the preset angle parameter, wherein the preset angle parameter is the angle at which the ultrasonic speaker in the earphone device emits the ultrasonic signal; Outputting a sound signal based on the propagation condition in a preset simulated human ear environment to perform a propagation test; Calculate the loudness attenuation of the sound transmitted from the ultrasonic speaker to the microphone based on the propagation test; The cancellation signal output by the ultrasonic speaker is compensated according to the loudness attenuation parameter to perform feedback noise reduction on the headphone device.

2. The feedback noise reduction method of the headphone device according to claim 1, characterized in that: The loudness attenuation parameters of the sound signal of the headphone device include: the loudness attenuation amount of the sound transmitted by the ultrasonic speaker to the microphone, and the loudness loss amount of the sound transmitted by the ultrasonic speaker to the preset human ear drum; The step of compensating the cancellation signal output by the ultrasonic speaker according to the loudness attenuation parameter to perform feedback noise reduction on the headphone device includes: Compensating for propagation loss of the cancellation signal output by the ultrasonic speaker according to the loudness attenuation amount, and compensating for loudness loss of the cancellation signal output by the ultrasonic speaker according to the loudness loss amount; The noise reduction compensation amount of the cancellation signal output by the ultrasonic speaker is determined according to the compensated propagation loss and the loudness loss, and the ultrasonic speaker outputs the cancellation signal according to the noise reduction compensation amount to perform feedback noise reduction on the headphone device.

3. The feedback noise reduction method of the headphone device according to claim 2, characterized in that: The loudness attenuation parameter of the sound signal transmitted by the earphone device includes: the loudness loss amount of the sound transmitted by the ultrasonic speaker to the preset human ear drum, and the step of calculating the loudness attenuation parameter of the sound signal transmitted by the earphone device according to the distance parameter also includes: In the propagation test, a first intensity of the sound signal received by the microphone is detected, and a second intensity of the sound signal received by the preset human eardrum is detected; The loudness loss amount of the sound transmitted by the ultrasonic speaker to the preset human ear membrane is calculated according to the first intensity and the second intensity.

4. The feedback noise reduction method of the headphone device according to claim 1, characterized in that: The preset human ear drum includes: a human ear drum in a simulated human ear and a drum of an actual user's ear, and the step of transmitting an ultrasonic signal by the ultrasonic speaker to perform distance measurement to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and the preset human ear drum includes: When it is determined that the earphone device is worn on the simulated human ear, the ultrasonic speaker emits an ultrasonic signal to perform distance measurement to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and the eardrum of the human ear; Alternatively, when it is determined that the headphone device is worn on the ear of the actual user, the ultrasonic signal is emitted by the ultrasonic speaker to perform distance measurement to calculate the distance parameters between the microphone inside the headphone device, the ultrasonic speaker and the eardrum of the ear of the actual user.

5. The feedback noise reduction method of the headphone device according to any one of claims 1 to 4, characterized in that: The step of calculating the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and a preset human eardrum comprises: In the distance measurement, the angle information of the ultrasonic speaker emitting the ultrasonic signal is detected, and the first time information of the ultrasonic signal being transmitted to the microphone after being reflected by the preset human eardrum is detected; The distance parameters between the microphone, the ultrasonic speaker and the preset human ear membrane are calculated according to the angle information, the first time information and the second time information when the ultrasonic signal is directly transmitted to the microphone.

6. The feedback noise reduction method of the headphone device according to any one of claims 1 to 4, characterized in that: The method further comprises: The ultrasonic speaker emits an ultrasonic signal to adjust the angle of the ultrasonic speaker, and based on the ultrasonic speaker after the angle adjustment, the step of measuring the distance by emitting an ultrasonic signal through the ultrasonic speaker is performed to obtain the distance parameters between the microphone inside the headphone device, the ultrasonic speaker and a preset human eardrum.

7. A feedback noise reduction device for an earphone device, characterized in that: The feedback noise reduction device of the headphone device is applied to a headphone device with an ultrasonic speaker configured inside, and the device comprises: A distance measurement module, used for measuring the distance by transmitting an ultrasonic signal through the ultrasonic speaker, so as to calculate the distance parameters between the microphone inside the earphone device, the ultrasonic speaker and a preset human eardrum; an attenuation calculation module, configured to calculate a loudness attenuation parameter of a sound signal propagating the headphone device according to the distance parameter, wherein the attenuation calculation module is specifically configured to simulate a propagation condition of a sound signal according to the distance parameter and a preset angle parameter, wherein the preset angle parameter is an angle at which an ultrasonic speaker in the headphone device emits an ultrasonic signal; output a sound signal based on the propagation condition in a preset simulated human ear environment to perform a propagation test; and calculate the loudness attenuation of the sound propagated from the ultrasonic speaker to the microphone based on the propagation test; The noise reduction module is used to compensate the cancellation signal output by the ultrasonic speaker according to the loudness attenuation parameter to perform feedback noise reduction of the headphone device.

8. An earphone device, characterized in that: The headphone device comprises: a memory, a processor, and a feedback noise reduction program of the headphone device stored in the memory and executable on the processor. When the feedback noise reduction program of the headphone device is executed by the processor, the steps of the feedback noise reduction method of the headphone device according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a feedback noise reduction program for the headphone device, and when the feedback noise reduction program for the headphone device is executed by the processor, the steps of the feedback noise reduction method for the headphone device according to any one of claims 1 to 6 are implemented.

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