CN112911446A - Filter parameter configuration method of noise reduction earphone and active noise reduction earphone - Google Patents
Filter parameter configuration method of noise reduction earphone and active noise reduction earphone Download PDFInfo
- Publication number
- CN112911446A CN112911446A CN202110169009.5A CN202110169009A CN112911446A CN 112911446 A CN112911446 A CN 112911446A CN 202110169009 A CN202110169009 A CN 202110169009A CN 112911446 A CN112911446 A CN 112911446A
- Authority
- CN
- China
- Prior art keywords
- noise reduction
- filter
- parameters
- parameter
- ear microphone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000009467 reduction Effects 0.000 title claims abstract description 233
- 238000000034 method Methods 0.000 title claims abstract description 56
- 230000005236 sound signal Effects 0.000 claims abstract description 26
- 238000004364 calculation method Methods 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 abstract description 18
- 230000006870 function Effects 0.000 description 20
- 208000009205 Tinnitus Diseases 0.000 description 17
- 238000010586 diagram Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 12
- 238000005070 sampling Methods 0.000 description 12
- 238000004590 computer program Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 210000000613 ear canal Anatomy 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 238000011946 reduction process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 210000005069 ears Anatomy 0.000 description 2
- 210000001260 vocal cord Anatomy 0.000 description 2
- 241001442654 Percnon planissimum Species 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Computational Linguistics (AREA)
- Quality & Reliability (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Headphones And Earphones (AREA)
Abstract
The invention provides a filter parameter configuration method of a noise reduction earphone and an active noise reduction earphone. The method comprises the following steps: receiving a configuration instruction, wherein the configuration instruction is used for instructing a noise reduction earphone to start noise reduction configuration; calculating the noise reduction amount of the noise reduction earphone in real time according to the configuration instruction, wherein the noise reduction amount is the ratio of the audio signals collected by the out-of-ear microphone and the in-ear microphone; on the basis of the noise reduction amount obtained in real time, correspondingly searching filter parameters of the filter component within a set parameter range according to a set step length, and determining the corresponding filter parameters when the noise reduction amount is maximum as current configuration parameters of the filter component, wherein when the filter parameters of the filter component are searched, the searching direction of the parameters is consistent with the increasing direction of the noise reduction amount; the filter component is configured by the current configuration parameters to reduce noise, so that the search efficiency is improved, the noise in the ear is stable and cannot be changed in time, and the user experience in the filter parameter configuration process is enhanced.
Description
Technical Field
The invention relates to a wireless earphone, in particular to a filter parameter configuration method of a noise reduction earphone and an active noise reduction earphone.
Background
At present, the active noise reduction earphone gradually walks to the life of people, and people can obtain a relatively quiet environment in a noisy environment. The principle of active noise reduction headphones is to reduce the noise heard by the ear by actively emitting sound waves of opposite phase to cancel the sound waves (feed forward) or adding a feedback acoustic path to the sound path (feedback). However, different noise conditions, different wearing manners of the earphones and different ear canal structures all affect the noise suppression function of the existing earphones, and bring less than ideal use experience to users.
Firstly, the noise reduction microphones of the earphones have inconsistency of sensitivity, phase and the like, the sound cavities of the earphones and the like also have inconsistency, and the characteristics of the sound cavities of the earphones and the like also have some changes before and after the earphones are assembled. Before the earphone is assembled into a complete machine, active noise reduction parameters are tested and configured, and the parameters obtained when the active noise reduction parameters are different from the parameters obtained when the complete machine is assembled, so that the noise reduction performance of the complete machine of the earphone is influenced.
Secondly, the noise reduction effect of the earphone is greatly influenced by different wearing modes and different ear canal structures. Different users have different ear canal structures, and different wearing modes lead to different relative positions between the earphone and the human ear, and the influence of the generated gap on noise and the influence on echo in the ear are different. Even if the same user uses the same type of earphone, the positions of the earphones in the ears of the user are not completely consistent each time the user wears the earphones, and therefore the filtering coefficients adopted when the noise of the earphones is reduced need to be actively adjusted in an adaptive mode.
Disclosure of Invention
The present disclosure is provided to solve the above-mentioned problems occurring in the prior art.
The invention discloses a filter parameter configuration method of a noise reduction earphone, wherein the noise reduction earphone comprises an in-ear microphone, an out-of-ear microphone and a filter component, and the method comprises the following steps: receiving a configuration instruction, wherein the configuration instruction is used for instructing a noise reduction earphone to start noise reduction configuration; calculating the noise reduction amount of the noise reduction earphone in real time according to the configuration instruction, wherein the noise reduction amount is the ratio of the audio signals collected by the out-of-ear microphone and the in-ear microphone; on the basis of the noise reduction amount obtained in real time, correspondingly searching filter parameters of the filter component within a set parameter range according to a set step length, and determining the corresponding filter parameters when the noise reduction amount is maximum as current configuration parameters of the filter component, wherein when the filter parameters of the filter component are searched, the searching direction of the parameters is consistent with the increasing direction of the noise reduction amount; configuring the filter component with the current configuration parameters for noise reduction.
Further, in some embodiments, the correspondingly searching for the filter parameter of the filter component according to the set step size within the set parameter range includes: searching for one or more filter parameters of the filter component; wherein the filter parameters include a gain factor, a cutoff frequency, and a Q value of the filter.
Further, in some embodiments, the searching for the filter parameter of the filter component in which the parameter search direction coincides with the direction in which the noise reduction amount increases includes: if at time t (N) the filter parameter of the filter component is Gn and the noise reduction is DN, at time t (N +1) the filter parameter of the filter component is Gn1 and the noise reduction is DN1, then: at time t (N +2), the filter parameters of the filter component are set to Gn2 such that Gn2-Gn1 is of the same sign as (DN1-DN) × (Gn 1-Gn).
Further, in some embodiments, the Gn2-Gn1 is the same sign as (DN1-DN) × (Gn1-Gn), including:
gn2-Gn1 ═ u (DN1-DN) × (Gn 1-Gn); or
Gn2-Gn1 ═ u × sign (DN1-DN) × (Gn 1-Gn); or
Gn2-Gn1＝u*sign(DN1-DN)*sign(Gn1-Gn)；
Where u is a positive constant, 0< u <1, generally u is close to 1, sign is a sign function.
Further, in some embodiments, the filter parameter configuration method further includes: when the in-ear microphone detects a voice signal, the calculation of the noise reduction amount and/or the search of the filter parameter is suspended.
Further, in some embodiments, the filter parameter configuration method further includes: and when the vibration sensor of the noise reduction earphone detects a vibration signal, suspending the calculation of the noise reduction amount and/or the search of the filter parameter.
Further, in some embodiments, the filter parameter configuration method further includes: the noise reduction configuration is initiated at intervals.
Further, in some embodiments, the ratio of the audio signals collected by the out-of-ear microphone and the in-ear microphone comprises: a ratio of audio energy collected by the out-of-ear microphone and the in-ear microphone; or the ratio of the audio amplitudes collected by the out-of-ear microphone and the in-ear microphone; or a difference in LOG domain of audio signals collected by the out-of-ear microphone and the in-ear microphone; or the ratio of the power or amplitude of the audio signals collected by the out-of-ear microphone and the in-ear microphone in the frequency domain.
The invention also discloses an active noise reduction earphone, which comprises an in-ear microphone, an out-of-ear microphone, a filter component and a processor, wherein the processor comprises: the receiving module is used for receiving a configuration instruction, and the configuration instruction is used for indicating the noise reduction earphone to start noise reduction configuration; the calculation module is used for calculating the noise reduction amount of the noise reduction earphone in real time according to the configuration instruction, wherein the noise reduction amount is the ratio of the audio signals collected by the out-of-ear microphone and the in-ear microphone; the determining module is used for correspondingly searching the filter parameters of the filter component within a set parameter range according to a set step length based on the noise reduction amount acquired in real time, and determining the corresponding filter parameters when the noise reduction amount is maximum as the current configuration parameters of the filter component, wherein when the filter parameters of the filter component are searched, the searching direction of the parameters is consistent with the increasing direction of the noise reduction amount; a configuration module to configure the filter component with the current configuration parameters for noise reduction.
Further, in some embodiments, the determining module searches filter parameters of the filter component correspondingly according to the set step size within the set parameter range, including: searching for one or more filter parameters of the filter component; wherein the filter parameters include a gain factor, a cutoff frequency, and a Q value of the filter.
Further, in some embodiments, the determining module, when searching for the filter parameter of the filter component, a search direction of the parameter coincides with the direction in which the noise reduction amount increases, including: if at time t (N) the filter parameter of the filter component is Gn and the noise reduction is DN, at time t (N +1) the filter parameter of the filter component is Gn1 and the noise reduction is DN1, then: at time t (N +2), the filter parameters of the filter component are set to Gn2 such that Gn2-Gn1 is of the same sign as (DN1-DN) × (Gn 1-Gn).
Further, in some embodiments, the active noise reduction headphone further comprises: and the voice signal detection module is used for suspending the calculation of the noise reduction amount and/or the search of the filter parameter when the voice signal is detected.
The filter parameter configuration method of the noise reduction earphone and the active noise reduction earphone disclosed by the embodiment of the invention can be used for adaptively adjusting the filter parameters in the actual use process of a user after the active noise reduction earphone is assembled into a complete machine. Namely, according to the set parameter range and step length, the noise reduction amount is calculated in real time, and the optimal filter parameter is selected in the set parameter range, so that the active noise reduction effect with the maximum noise reduction amount is realized, and the user experience is better. In addition, in the parameter searching process, the searching direction is consistent with the direction of increasing the noise reduction amount, namely, the parameter searching is carried out towards the direction of the optimal parameter, so that the searching efficiency is improved, the in-ear noise is stable and cannot be changed in time, and the user experience in the filter parameter configuration process is enhanced.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 shows a schematic diagram of a headphone active noise reduction process 100 according to an embodiment of the present disclosure.
Fig. 2 shows a flowchart of a filter parameter configuration method of a noise reduction headphone according to an embodiment of the present application.
Fig. 3 is a schematic diagram illustrating a correspondence relationship between noise reduction amounts and filter parameters according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an active noise reduction earphone according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a processor of an active noise reduction headphone according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be embodied as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software. The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments of the invention.
Fig. 1 shows a schematic diagram of a headphone active noise reduction process 100 according to an embodiment of the present disclosure. As shown in fig. 1, the headphone may implement an active noise reduction process 100 through a feed-forward path and a feedback path. In some embodiments, on the feed-forward path, the ear microphone 101a collects the ambient noise outside the earphone, and the ambient noise collected by the ear microphone 101a may include an audio component leaked to the surrounding environment outside the ear when the speaker 107 of the earphone plays the audio signal, in addition to the noise generated by the surrounding environment, and the audio component is a part of the ambient noise. The collected ambient noise is subjected to gain processing by an analog gain 102a and analog-to-digital conversion by a first analog-to-digital converter 103a, and then is transmitted to a first low-pass and down-sampling filter 104 a. The first low pass and down sample filter 104a can reduce the filter sampling rate, thereby reducing power consumption and filter order, and further reducing the area of the noise reduction chip and reducing cost. Then, the ambient noise signal passing through the first low-pass and down-sampling filter 104a is filtered by the feedforward filter 111, and the ambient noise signal processed by the feedforward filter 111 is transmitted to the adder 109, and then played by the speaker 107 after being processed by digital-to-analog conversion by the digital-to-analog converter 106. The feedforward filtered ambient noise played out by the speaker 107 and arriving in the ear creates air cancellation to achieve noise reduction.
In some embodiments, in the feedback path, the in-ear microphone 101b collects in-ear noise including an audio echo signal generated when the audio signal is played and an in-ear residual signal after air cancellation at a position inside the earphone near the ear canal. The collected in-ear noise is subjected to gain processing by an analog gain 102b and analog-to-digital conversion by a second analog-to-digital converter 103b, and then transmitted to a second low-pass and down-sampling filter 104 b. The second low pass and downsample filter 104b can reduce the filter sampling rate, thereby reducing power consumption and filter order, and further reducing the area of the noise reduction chip and reducing cost. Subsequently, the in-ear noise signal passing through the second low-pass and down-sampling filter 104b is transmitted to the adder 110.
The audio signal to be played 105 is an audio signal to be transmitted to the speaker 107 for playing, and on one hand, it is transmitted to the adder 109, and after being processed by the digital-to-analog conversion of the digital-to-analog converter 106, it is played by the speaker 107; on the other hand, it is transmitted to an echo filter 112, and the echo filter 112 is used to generate an audio echo signal generated by the audio signal 105 to be broadcast reflected by the ear canal after being played by the speaker 107, and then the audio echo signal is fed to an adder 110 to be cancelled. The adder 110 integrates the in-ear noise processed by the second low-pass and down-sampling filter 104b with the audio signal processed by the echo filter 112, so that the noise signal in the feedback path is no longer affected by the audio echo signal. The summer 110 then transmits the integrated noise signal to the feedback filter 112 for filtering. The noise signal after the feedback filter is transmitted to the adder 109 after passing through the limiter 108, and is played by the speaker 107 after being processed by digital-to-analog conversion of the digital-to-analog converter 106, thereby realizing feedback noise reduction.
In some cases, the digital-to-analog converter 106 may first perform upsampling filtering, and then perform digital-to-analog conversion, so that the digital-to-analog converter operates at a higher sampling rate, thereby improving the performance of the digital-to-analog converter.
The above is the working principle of noise reduction of the earphone according to the embodiment of the present disclosure. The active noise reduction earphone is divided into a left earphone and a right earphone, the left earphone and the right earphone can be connected in a wired mode or in a wireless mode, and the active noise reduction method shown in the figure 1 is suitable for any one of the left earphone and the right earphone.
In a first aspect of the present application, a method for determining filter parameters of an active noise reduction headphone is provided, which is compatible and applicable to the active noise reduction process shown in fig. 1, and the present application implements an active noise reduction effect with a maximum noise reduction amount by searching and adjusting filter parameters of a feedforward filter and/or a feedback filter.
Fig. 2 shows a flowchart of a filter parameter configuration method of a noise reduction headphone according to an embodiment of the present application. As shown in fig. 2, includes:
step S201, receiving a configuration instruction, wherein the configuration instruction is used for instructing a noise reduction earphone to start noise reduction configuration;
step S202, calculating the noise reduction amount of the noise reduction earphone in real time according to the configuration instruction, wherein the noise reduction amount is the ratio of the audio signals collected by the out-of-ear microphone and the in-ear microphone;
step S203, on the basis of the noise reduction amount obtained in real time, correspondingly searching filter parameters of the filter component within a set parameter range according to a set step length, and determining the corresponding filter parameters when the noise reduction amount is maximum as current configuration parameters of the filter component, wherein when the filter parameters of the filter component are searched, the searching direction of the parameters is consistent with the increasing direction of the noise reduction amount;
step S104, configuring the filter component with the current configuration parameter for noise reduction.
In step S101, the configuration command may be a command signal input by an external device, or a command signal generated by the noise reduction earphone itself through the operation of the noise reduction earphone by the user.
In some embodiments, the active noise reduction earphone is wirelessly connected with an external intelligent terminal in a wireless mode such as bluetooth or bluetooth low energy, and the intelligent terminal is provided with an APP module for controlling the noise reduction earphone. The user controls and inputs the APP in a voice or touch mode, for example, an active noise reduction configuration function in the APP is opened, that is, a noise reduction configuration instruction is sent to a noise reduction earphone terminal, and the noise reduction earphone is instructed to start noise reduction configuration. In one embodiment, the intelligent terminal sends the configuration command to one of the earphones, such as the left earphone, and then the left earphone forwards the configuration command or the parameters belonging to the right earphone.
In other embodiments, a button or some combination of buttons may be provided on the left and right earphones or on a single earphone of the noise reduction earphones, so as to activate the noise reduction configuration function of the noise reduction earphones and perform the performance measurement of the noise reduction filter parameters. In one embodiment, taking the button on the left earphone as an example, pressing the button on the left earphone not only starts the noise reduction measurement of the left earphone, but also sends a start command to the right earphone through wireless connection, and after receiving the start command, the right earphone starts the noise reduction measurement of the right earphone.
In step S202 of this embodiment, according to a configuration instruction, a noise reduction amount of the noise reduction earphone is calculated in real time, where the noise reduction amount is a ratio of audio signals collected by the out-of-ear microphone and the in-ear microphone. According to the embodiment of fig. 1 regarding active noise reduction, the audio signals collected by the out-of-ear microphone and the in-ear microphone are noise signals. In some embodiments, the ratio of the audio signals collected by the ear microphone and the ear microphone may be the ratio of the audio energy collected by the ear microphone and the ear microphone; or the ratio of the audio amplitudes collected by the out-of-ear microphone and the in-ear microphone; or the difference value of the LOG domain of the audio signals collected by the out-of-ear microphone and the in-ear microphone; or the ratio of the power or amplitude of the audio signals collected by the out-of-ear microphone and the in-ear microphone in the frequency domain after Fourier transformation.
In some embodiments, the in-ear noise/out-of-ear noise collected by the in-ear microphone and the out-of-ear microphone may be filtered first. The filtering may be a high pass filter with cut-off frequencies such as 20Hz, 50Hz, 100 Hz; there may also be a low pass filter with cut-off frequencies such as 500Hz, 1KHz, 2 KHz. After filtering, the noise energy is calculated. The high-pass filter and the low-pass filter need to be set in consideration of the noise reduction bandwidth of the feedforward channel, and the possible amplification effect of the noise signal outside the noise reduction bandwidth of the feedforward channel is considered.
In some embodiments, the in-ear noise/out-of-ear noise collected by the in-ear microphone and the out-of-ear microphone may be weighted at different frequency points in the frequency domain. A relatively large weight may be used within the noise reduction bandwidth of the feed-forward path and a smaller or 0 weight may be used for frequencies that are susceptible to interference. For example, for low frequencies (below 50 Hz), a smaller or 0 weight is used. In addition, different sensitivities of human ears to different frequencies can be utilized, and different frequencies can be weighted by utilizing a human ear frequency sensitivity curve.
In the embodiment of the present invention, in step S203, based on the noise reduction amount obtained in real time, filter parameters of the filter component are correspondingly searched according to a set step length within a set parameter range, for example, all parameters within a parameter range [ G0, G1] are set to be searched according to a certain step length deltac, and an optimal parameter is found according to the noise reduction amount.
In this embodiment, the filter component includes a feedforward filter and a feedback filter, and the filter may be an IIR filter, or may be formed by connecting a plurality of 2 nd order IIR filters in series. For a2 nd order filter, the parameters searched and adjusted include filter gain factor gain, cut-off frequency fc, sampling frequency fs, Q value Q of the filter, etc., or, in some embodiments, the parameters searched and adjusted may be a function of one or more parameters.
In the process of calculating the filter coefficients using these parameters, one obtains:
A＝10.0^(gain/40.0)；
omega＝2.0*pi*fc/fs；
sinw＝sin(omega)；
cosw＝cos(omega)；
alpha＝sinw/(2*q)；
in one embodiment, if the filter is a low shelf filter, the 2 nd order IIR filter coefficients are: numerator [ b0, b1, b2], denominator [ a0, a1, a2], then:
b0＝A*((A+1.0)-(A-1.0)*cosw+2.0*sqrt(A)*alpha)；
b1＝2.0*A*((A-1.0)-(A+1.0)*cosw)；
b2＝A*((A+1.0)-(A-1.0)*cosw-2.0*sqrt(A)*alpha)；
a0＝(A+1.0)+(A-1.0)*cosw+2.0*sqrt(A)*alpha；
a1＝-2.0*((A-1.0)+(A+1.0)*cosw)；
a2＝(A+1.0)+(A-1.0)*cosw-2.0*sqrt(A)*alpha。
in another embodiment, if the filter is a peak or notch filter, the 2 nd order IIR filter coefficients are: the numerator is [ b0, b1, b2], the denominator is [ a0, a1, a2], then:
b0＝1.0+(alpha*A)；
b1＝-2.0*cosw；
b2＝1.0-(alpha*A)；
a0＝1.0+(alpha/A)；
a1＝-2.0*cosw；
a2＝1.0-(alpha/A)。
as can be seen from the above calculation process, the main parameters determining the performance of the filter include the gain factor gain, the cut-off frequency fc, the sampling frequency fs, the Q value Q of the filter, and so on.
Therefore, in the embodiment of the present invention, the searched and adjusted filter parameters may include at least a gain factor, a cut-off frequency, a sampling frequency, and a Q value, and the filter parameters of the filter component are correspondingly searched according to a set step size within a set parameter range, which may be one or more filter parameters for searching the filter component, or may be a function of one or more filter parameters.
In one embodiment, if only one parameter is searched and adjusted, the parameter range of the parameter may be set, for example, only the gain factor gain is adjusted, the parameter range of the gain factor [ G0, G1] is set, a plurality of gain factors are searched within the parameter range [ G0, G1] according to the set step length deltac, and the corresponding gain factor when the noise reduction amount is maximum is determined as the currently configured gain factor of the filter assembly. The same applies to the other filter parameters cut-off frequency, sampling frequency and Q value.
In another embodiment, if a plurality of filter parameters need to be searched and adjusted, parameter ranges of the plurality of parameters are set, for example, parameter ranges of gain factors gain [ G0, G1] and parameter ranges of Q values Q [ Q0, Q1 ]. In specific implementation, the gain factors can be searched in the parameter range [ G0, G1] firstly, the corresponding gain factor Gm when the noise reduction amount is maximum is determined, then Q values are searched in the parameter range [ Q0, Q1], the corresponding Q value Qm when the noise reduction amount is maximum is determined, and the Gm and the Qm are determined as the current configuration parameters of the filter component, so that the noise reduction amount is maximum, and the noise reduction effect is best.
In yet another embodiment, if a plurality of filter parameters need to be searched and adjusted, parameter ranges of the plurality of parameters are set, for example, the adjusted filter parameters are gain factors gain and Q values Q, parameter ranges of two parameter combinations [ (G0, Q0), (G1, Q1) ] may be set, and the corresponding gain factor and Q value combination (Gm, Qm) when the noise reduction amount is maximum is determined as the current configuration parameter of the filter component.
In yet another embodiment, if the function to be searched and adjusted is a filter parameter, for example, the intermediate function a obtained according to the gain factor gain is 10.0^ (gain/40.0), the parameter range [ a0, a1] of the function a is set, a plurality of parameters are searched within the parameter range [ a0, a1] according to the set step length deltac, and the corresponding parameter a when the noise reduction amount is maximum is determined as the current configuration parameter a of the filter component. The same applies to functions of other filter parameters.
In the above embodiment, the parameter range (including a single parameter range or a combined parameter range of a plurality of parameters) and the step length deltac may be set by a person skilled in the art according to professional experience and pre-stored in the memory of the noise reduction earphone chip. In one embodiment, the parameters may be written into the memory at the time of factory shipment and may not be modified, and in another embodiment, the parameters may be rewritten or may be modified in a manner controlled by the smart terminal APP, for example, rewritten at the time of firmware upgrade, so that the noise reduction configuration is more flexible.
In the process of searching for the optimal filter parameter, if the configured filter parameter is far away from the optimal parameter, the noise reduction amount is small, the in-ear noise may be large, and in the process of searching for the filter parameter, along with different configured filter parameters, the in-ear noise is large and small, and the user experience is seriously influenced. In order to make the filter parameter variation as close as possible to the optimum filter parameter, the direction of the filter parameter variation coincides with the direction in which the noise reduction amount increases, that is, the search direction of the parameter coincides with the direction in which the noise reduction amount increases when the filter parameters of the filter component are searched.
The following describes the filter parameter configuration method of the present invention by taking the searched and adjusted filter parameter as the gain factor gain.
In specific implementation, if at time t (N), the gain factor of the filter component is Gn, the noise reduction amount is DN, at time t (N +1), the gain factor of the filter component is Gn1, and the noise reduction amount is DN1, then:
at time t (N +2), the gain factor of the filter bank is set to Gn2 such that Gn2-Gn1 is of the same sign as (DN1-DN) × (Gn1-Gn), i.e.:
gn2-Gn1 ═ u (DN1-DN) × (Gn 1-Gn); or
Gn2-Gn1 ═ u × sign (DN1-DN) × (Gn 1-Gn); or
Gn2-Gn1＝u*sign(DN1-DN)*sign(Gn1-Gn)；
Where u is a positive constant, 0< u <1, generally u is close to 1, sign is a sign function.
Fig. 3 is a schematic diagram illustrating a relationship between a noise reduction amount and a gain factor according to an embodiment of the present invention. As shown in fig. 3, the abscissa represents the gain factor and the ordinate represents the noise reduction amount, and it can be seen that the variation trend of the correspondence relationship between the gain factor and the noise reduction amount is approximated to a convex function. In the embodiment of the present invention, when searching for the gain factor of the filter component, the search direction of the gain factor coincides with the direction in which the noise reduction amount increases, and as is apparent from fig. 3, at time t (N), the gain factor of the filter component is Gn, the noise reduction amount is DN, and at time t (N +1), the gain factor of the filter component is Gn1, and the noise reduction amount is DN1, and since the noise reduction amount DN1> DN is an increasing trend, when searching for the gain factor at the next time, a search is also performed in the direction from Gn → Gn +1 → … … according to the gain factor, that is, a search for a gain factor larger than Gn +1 at the next time. It is understood that if the noise reduction amount DN1< DN, which is a decreasing trend, is searched for the gain factor at the next time, the parameters are searched for in the direction of the gain factor from Gn +1 → Gn → … …, i.e., the gain factor smaller than Gn is searched for at the next time. Therefore, the gain factor searching can be carried out towards the direction of the optimal parameter, the searching efficiency is improved, the in-ear noise is stable and cannot be changed in time, and the user experience in the filter parameter configuration process is enhanced.
As can be seen from fig. 3, within the gain factor G0, G1, the noise reduction amount is at most Gm, i.e., the noise reduction amount is at the vertex of the convex function curve. However, in the actual application, because the parameter Gm does not necessarily exist in the value of the gain factor searched according to the step length due to the relationship of the precision setting of the step length deltac, one of the two parameters Gm-1 and Gm +1 closest to the parameter Gm that can be searched according to the step length is the optimal gain factor, if the noise reduction amount Dm-1 corresponding to the parameter Gm-1 is larger than the noise reduction amount Dm +1 corresponding to the parameter Gm +1, the parameter Gm-1 is the optimal gain factor, otherwise, the parameter Gm +1 is the optimal gain factor. In fig. 3, it can be seen that the noise reduction amount corresponding to the optimum parameter Gm-1 is the largest among all the gain factors searched within G0, G1 in terms of step size.
It will be appreciated by those skilled in the art that the corresponding gain factor searching and adjusting method of fig. 3 is equally applicable to searching and adjusting other filter parameters (e.g., cutoff frequency, Q value). In the embodiment of the application, in the parameter searching process, the searching direction is consistent with the direction of increasing the noise reduction amount, namely, the parameter searching is carried out towards the direction of the optimal parameter, so that the searching efficiency is improved, the in-ear noise is stable, the noise cannot be increased or decreased, and the user experience in the filter parameter configuration process is enhanced.
In some embodiments, the filter parameter configuration method of the present invention may adaptively adjust the filter parameters after the headset is worn on the ear of the person. In one embodiment, real-time adjustment can be made at all times after the headset is worn on the ear of a person; or may be set to adjust once every a period of time to save power consumption of the noise reduction earphone. In some embodiments, a vibration sensor is also included in the noise reduction earphone, and when the user speaks, vocal cord vibrations are transmitted to the ear through the cheek or the like, so that a vibration signal is detected by the vibration sensor. When the vibration sensor detects a vibration signal, the noise reduction amount calculation and/or the filter parameter search is suspended. Therefore, the interference of voice and low-frequency vibration on parameter searching and adjusting can be avoided when a user speaks. In addition, a voice detection module can be arranged on the microphone outside the ear, voice detection processing is carried out on the collected audio signals, and when the voice signals are detected, noise reduction calculation and/or filter parameter search are suspended. This is because low frequency interference and/or speech signal interference may occur when the user speaks or makes some movement, which may affect the accuracy of noise reduction detection and thus the estimation of noise reduction under the current filter parameters.
In an embodiment of the invention, the filter component comprises a feedforward filter and a feedback filter. In some embodiments, the adjusted filter parameters may include only the filter parameters of the feedforward filter that adjust the feedforward path. Because the noise reduction filter parameters of the feedforward channel are sensitive to noise reduction effects for different wearers and different wearing modes, such as wearing tightness, wearing specification and the like. And the noise reduction filter parameters of the feedback channel are relatively insensitive to noise reduction effect for different wearers and different wearing modes. Therefore, in general, the noise reduction filter parameters are configured for the noise reduction filter parameters of the feedforward channel, as well as the present invention. However, the present invention is not limited to this, and the method of configuring the noise reduction parameters is also applicable to setting the noise reduction filter parameters for the feedback channel. Configuring noise reduction filter parameters of a feedforward channel, and testing noise reduction effect, wherein in some embodiments, a noise reduction channel of a feedback channel can be opened to work normally; in other embodiments, the noise reduction channel of the feedback channel may be closed, and at this time, only the noise reduction effect of the feedforward channel is tested, so that the influence of the noise reduction filter parameters of different feedforward channels on the noise reduction effect can be obtained more clearly.
In the embodiment of the invention, in the switching of different noise reduction filter parameters, a soft switching method is used, so that the noise reduction filter parameters are smoothly switched from one group to another group, and a user does not feel sudden change of noise, and harsh noise such as papa, sudden burst and the like.
The noise reduction earphone parameter configuration method disclosed in this embodiment can adaptively adjust the filter parameters in the actual use process of the user after the active noise reduction earphone is assembled into a complete machine. Namely, according to the set parameter range and step length, the noise reduction amount is calculated in real time, and the optimal filter parameter is selected in the set parameter range, so that the active noise reduction effect with the maximum noise reduction amount is realized, and the user experience is better. In addition, in the parameter searching process, the searching direction is consistent with the direction of increasing the noise reduction amount, namely, the parameter searching is carried out towards the direction of the optimal parameter, so that the searching efficiency is improved, the in-ear noise is stable and cannot be changed in time, and the user experience in the filter parameter configuration process is enhanced.
Having described the method of an exemplary embodiment of the present invention, an active noise reduction headphone of an exemplary embodiment of the present invention is next described with reference to fig. 4. The implementation of the device can be referred to the implementation of the method, and repeated details are not repeated. The terms "module" and "unit", as used below, may be software and/or hardware that implements a predetermined function. While the modules described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.
Fig. 4 is a schematic structural diagram of an active noise reduction earphone according to an embodiment of the present invention. As shown in fig. 4, the active noise reduction headphone 400 of the present embodiment includes: an in-ear microphone 401, an out-of-ear microphone 402, a filter component 403, and a processor 404. The in-ear microphone 401 is used for collecting in-ear noise, and the out-of-ear microphone 402 is used for collecting out-of-ear noise.
In this embodiment, as shown in fig. 5, the processor 404 includes:
a receiving module 501, configured to receive a configuration instruction, where the configuration instruction is used to instruct a noise reduction earphone to start noise reduction configuration;
a calculating module 502, configured to calculate, in real time, a noise reduction amount of the noise reduction earphone according to the configuration instruction, where the noise reduction amount is a ratio of audio signals collected by the out-of-ear microphone and the in-ear microphone;
a determining module 503, configured to correspondingly search, within a set parameter range, a filter parameter of the filter component according to a set step length based on the noise reduction amount obtained in real time, and determine, as a current configuration parameter of the filter component, a filter parameter corresponding to the maximum noise reduction amount, where a search direction of the parameter is consistent with a direction in which the noise reduction amount increases when searching for the filter parameter of the filter component;
a configuration module 504 for configuring the filter component with the current configuration parameters for noise reduction.
In some embodiments, the determining module 503 correspondingly searches the filter parameters of the filter component according to the set step size within the set parameter range, including: searching for one or more filter parameters of the filter component; wherein the filter parameters include a gain factor, a cutoff frequency, and a Q value of the filter.
In some embodiments, the determining module 503, when searching for the filter parameter of the filter component, a search direction of the parameter coincides with the direction in which the noise reduction amount increases, and includes:
if at time t (N) the filter parameter of the filter component is Gn and the noise reduction is DN, at time t (N +1) the filter parameter of the filter component is Gn1 and the noise reduction is DN1, then:
at time t (N +2), the filter parameters of the filter component are set to Gn2 such that Gn2-Gn1 is of the same sign as (DN1-DN) × (Gn 1-Gn).
In some embodiments, the active noise reduction headphone 4 further comprises: and the voice signal detection module is used for suspending the calculation of the noise reduction amount and/or the search of the filter parameter when the voice signal is detected. In some embodiments, a vibration sensor is also included in the noise reduction earphone, and when the user speaks, vocal cord vibrations are transmitted to the ear through the cheek or the like, so that a vibration signal is detected by the vibration sensor. When the vibration sensor detects a vibration signal, the noise reduction amount calculation and/or the filter parameter search is suspended. Therefore, the interference of voice and low-frequency vibration on parameter searching and adjusting can be avoided when a user speaks. In addition, a voice detection module can be arranged on the microphone outside the ear, voice detection processing is carried out on the collected audio signals, and when the voice signals are detected, noise reduction calculation and/or filter parameter search are suspended. This is because low frequency interference and/or speech signal interference may occur when the user speaks or makes some movement, which may affect the accuracy of noise reduction detection and thus the estimation of noise reduction under the current filter parameters.
Furthermore, although in the above detailed description several units of an active noise reduction headphone are mentioned, this division is only not mandatory. Indeed, the features and functions of two or more of the units described above may be embodied in one unit, according to embodiments of the invention. Also, the features and functions of one unit described above may be further divided into embodiments by a plurality of units.
A third aspect of the present disclosure proposes a non-transitory computer-readable medium storing instructions that, when executed by a processor, perform a filter parameter configuration method according to the first aspect of the present disclosure.
The filter parameter configuration method of the noise reduction earphone and the active noise reduction earphone disclosed by the embodiment of the invention can be used for adaptively adjusting the filter parameters in the actual use process of a user after the active noise reduction earphone is assembled into a complete machine. Namely, according to the set parameter range and step length, the noise reduction amount is calculated in real time, and the optimal filter parameter is selected in the set parameter range, so that the active noise reduction effect with the maximum noise reduction amount is realized, and the user experience is better. In addition, in the parameter searching process, the searching direction is consistent with the direction of increasing the noise reduction amount, namely, the parameter searching is carried out towards the direction of the optimal parameter, so that the searching efficiency is improved, the in-ear noise is stable and cannot be changed in time, and the user experience in the filter parameter configuration process is enhanced.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (12)
1. A method for configuring filter parameters of a noise reduction headphone, the noise reduction headphone comprising an in-ear microphone, an out-of-ear microphone, and a filter component, the method comprising:
receiving a configuration instruction, wherein the configuration instruction is used for instructing a noise reduction earphone to start noise reduction configuration;
calculating the noise reduction amount of the noise reduction earphone in real time according to the configuration instruction, wherein the noise reduction amount is the ratio of the audio signals collected by the out-of-ear microphone and the in-ear microphone;
on the basis of the noise reduction amount obtained in real time, correspondingly searching filter parameters of the filter component within a set parameter range according to a set step length, and determining the corresponding filter parameters when the noise reduction amount is maximum as current configuration parameters of the filter component, wherein when the filter parameters of the filter component are searched, the searching direction of the parameters is consistent with the increasing direction of the noise reduction amount;
configuring the filter component with the current configuration parameters for noise reduction.
2. The method of claim 1, wherein the correspondingly searching for the filter parameter of the filter component according to the set step size within the set parameter range comprises:
searching for one or more filter parameters of the filter component;
wherein the filter parameters include a gain factor, a cutoff frequency, and a Q value of the filter.
3. The method according to claim 1, wherein the searching for the filter parameter of the filter component in which the parameter search direction coincides with the direction in which the noise reduction amount increases includes:
if at time t (N) the filter parameter of the filter component is Gn and the noise reduction is DN, at time t (N +1) the filter parameter of the filter component is Gn1 and the noise reduction is DN1, then:
at time t (N +2), the filter parameters of the filter component are set to Gn2 such that Gn2-Gn1 is of the same sign as (DN1-DN) × (Gn 1-Gn).
4. The filter parameter configuration method of claim 3, wherein the Gn2-Gn1 is of the same sign as (DN1-DN) × (Gn1-Gn), comprising:
gn2-Gn1 ═ u (DN1-DN) × (Gn 1-Gn); or
Gn2-Gn1 ═ u × sign (DN1-DN) × (Gn 1-Gn); or
Gn2-Gn1＝u*sign(DN1-DN)*sign(Gn1-Gn)；
Where u is a positive constant, 0< u <1, sign is a sign function.
5. The method of claim 1, further comprising: when the in-ear microphone detects a voice signal, the calculation of the noise reduction amount and/or the search of the filter parameter is suspended.
6. The method of claim 1, further comprising: and when the vibration sensor of the noise reduction earphone detects a vibration signal, suspending the calculation of the noise reduction amount and/or the search of the filter parameter.
7. The filter parameter configuration method according to any one of claims 1 to 6, further comprising: the noise reduction configuration is initiated at intervals.
8. The method of any of claims 1-6, wherein the ratio of the audio signals collected by the out-of-ear microphone and the in-ear microphone comprises:
a ratio of audio energy collected by the out-of-ear microphone and the in-ear microphone; or
A ratio of audio amplitudes collected by the out-of-ear microphone and the in-ear microphone; or
A difference in LOG domain of audio signals collected by the out-of-ear microphone and the in-ear microphone; or
A ratio of power or amplitude of audio signals collected by the out-of-ear microphone and the in-ear microphone in a frequency domain.
9. An active noise reduction headphone comprising an in-ear microphone, an out-of-ear microphone, a filter component, and a processor, the processor comprising:
the receiving module is used for receiving a configuration instruction, and the configuration instruction is used for indicating the noise reduction earphone to start noise reduction configuration;
the calculation module is used for calculating the noise reduction amount of the noise reduction earphone in real time according to the configuration instruction, wherein the noise reduction amount is the ratio of the audio signals collected by the out-of-ear microphone and the in-ear microphone;
the determining module is used for correspondingly searching the filter parameters of the filter component within a set parameter range according to a set step length based on the noise reduction amount acquired in real time, and determining the corresponding filter parameters when the noise reduction amount is maximum as the current configuration parameters of the filter component, wherein when the filter parameters of the filter component are searched, the searching direction of the parameters is consistent with the increasing direction of the noise reduction amount;
a configuration module to configure the filter component with the current configuration parameters for noise reduction.
10. The active noise reduction earphone according to claim 9 wherein the determining module searches the filter parameters of the filter component in a set parameter range according to a set step size, and comprises:
searching for one or more filter parameters of the filter component;
wherein the filter parameters include a gain factor, a cutoff frequency, and a Q value of the filter.
11. The active noise reduction earphone according to claim 9, wherein the determining module searches the parameters of the filter component in a search direction of the parameters consistent with the direction of the increase of the noise reduction amount comprises:
if at time t (N) the filter parameter of the filter component is Gn and the noise reduction is DN, at time t (N +1) the filter parameter of the filter component is Gn1 and the noise reduction is DN1, then:
at time t (N +2), the filter parameters of the filter component are set to Gn2 such that Gn2-Gn1 is of the same sign as (DN1-DN) × (Gn 1-Gn).
12. The active noise reduction earphone of claim 9 further comprising:
and the voice signal detection module is used for suspending the calculation of the noise reduction amount and/or the search of the filter parameter when the voice signal is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110169009.5A CN112911446A (en) | 2021-02-07 | 2021-02-07 | Filter parameter configuration method of noise reduction earphone and active noise reduction earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110169009.5A CN112911446A (en) | 2021-02-07 | 2021-02-07 | Filter parameter configuration method of noise reduction earphone and active noise reduction earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112911446A true CN112911446A (en) | 2021-06-04 |
Family
ID=76123662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110169009.5A Pending CN112911446A (en) | 2021-02-07 | 2021-02-07 | Filter parameter configuration method of noise reduction earphone and active noise reduction earphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112911446A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113630684A (en) * | 2021-08-31 | 2021-11-09 | 恒玄科技(上海)股份有限公司 | Earphone with active noise reduction function and noise reduction method thereof |
| CN113645533A (en) * | 2021-08-31 | 2021-11-12 | 恒玄科技(上海)股份有限公司 | Active noise reduction earphone and noise reduction method thereof |
| WO2023159716A1 (en) * | 2022-02-24 | 2023-08-31 | 歌尔股份有限公司 | Adaptive adjustment method and device for anc parameter, and storage medium |
| CN117156333A (en) * | 2023-02-24 | 2023-12-01 | 荣耀终端有限公司 | Noise reduction method, earphone device and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106412788A (en) * | 2016-10-31 | 2017-02-15 | 歌尔科技有限公司 | Method and system for testing feed-forward active noise reduction earphones |
| CN110809211A (en) * | 2020-01-08 | 2020-02-18 | 恒玄科技(北京)有限公司 | Method for actively reducing noise of earphone, active noise reduction system and earphone |
| CN110996215A (en) * | 2020-02-26 | 2020-04-10 | 恒玄科技(北京)有限公司 | Method, device and computer readable medium for determining noise reduction parameters of earphone |
| CN111083591A (en) * | 2019-12-13 | 2020-04-28 | 恒玄科技(北京)有限公司 | Configuration method and device of noise reduction earphone and noise reduction earphone |
| US10834494B1 (en) * | 2019-12-13 | 2020-11-10 | Bestechnic (Shanghai) Co., Ltd. | Active noise control headphones |
-
2021
- 2021-02-07 CN CN202110169009.5A patent/CN112911446A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106412788A (en) * | 2016-10-31 | 2017-02-15 | 歌尔科技有限公司 | Method and system for testing feed-forward active noise reduction earphones |
| CN111083591A (en) * | 2019-12-13 | 2020-04-28 | 恒玄科技(北京)有限公司 | Configuration method and device of noise reduction earphone and noise reduction earphone |
| US10834494B1 (en) * | 2019-12-13 | 2020-11-10 | Bestechnic (Shanghai) Co., Ltd. | Active noise control headphones |
| CN110809211A (en) * | 2020-01-08 | 2020-02-18 | 恒玄科技(北京)有限公司 | Method for actively reducing noise of earphone, active noise reduction system and earphone |
| CN111541971A (en) * | 2020-01-08 | 2020-08-14 | 恒玄科技(北京)有限公司 | Method for actively reducing noise of earphone, active noise reduction system and earphone |
| CN110996215A (en) * | 2020-02-26 | 2020-04-10 | 恒玄科技(北京)有限公司 | Method, device and computer readable medium for determining noise reduction parameters of earphone |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113630684A (en) * | 2021-08-31 | 2021-11-09 | 恒玄科技(上海)股份有限公司 | Earphone with active noise reduction function and noise reduction method thereof |
| CN113645533A (en) * | 2021-08-31 | 2021-11-12 | 恒玄科技(上海)股份有限公司 | Active noise reduction earphone and noise reduction method thereof |
| CN113630684B (en) * | 2021-08-31 | 2023-12-08 | 恒玄科技(上海)股份有限公司 | Earphone with active noise reduction function and noise reduction method thereof |
| CN113645533B (en) * | 2021-08-31 | 2024-02-02 | 恒玄科技(上海)股份有限公司 | Active noise reduction earphone and noise reduction method thereof |
| WO2023159716A1 (en) * | 2022-02-24 | 2023-08-31 | 歌尔股份有限公司 | Adaptive adjustment method and device for anc parameter, and storage medium |
| CN117156333A (en) * | 2023-02-24 | 2023-12-01 | 荣耀终端有限公司 | Noise reduction method, earphone device and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112788466A (en) | Filter parameter configuration method of active noise reduction earphone and active noise reduction earphone | |
| CN112911446A (en) | Filter parameter configuration method of noise reduction earphone and active noise reduction earphone | |
| JP7250418B2 (en) | Audio processing apparatus and method for estimating signal-to-noise ratio of acoustic signals | |
| CN112334972B (en) | Headset system, personal acoustic device and method for detecting feedback instability | |
| US11636841B2 (en) | Automatic gain control in an active noise reduction (ANR) signal flow path | |
| US10553195B2 (en) | Dynamic compensation in active noise reduction devices | |
| US9466281B2 (en) | ANC noise active control audio headset with prevention of the effects of a saturation of the feedback microphone signal | |
| US10580398B2 (en) | Parallel compensation in active noise reduction devices | |
| JP5114611B2 (en) | Noise control system | |
| EP2284831B1 (en) | Method and device for active noise reduction using perceptual masking | |
| EP3618058B1 (en) | Compensation and automatic gain control in active noise reduction devices | |
| CN111010646A (en) | Method and system for transparent transmission of earphone and earphone | |
| US20130039518A1 (en) | Method and device for acoustic management contorl of multiple microphones | |
| WO2009136953A1 (en) | Method and device for acoustic management control of multiple microphones | |
| EP3886085B1 (en) | Active noise cancelling method | |
| JP2009272946A (en) | Signal processing device, and signal processing method | |
| CN101222787A (en) | Noise reducing device with controlled switching of noise reducing characteristics | |
| CN113728378A (en) | Wind noise suppression and method for active noise cancellation systems | |
| CN111083591A (en) | Configuration method and device of noise reduction earphone and noise reduction earphone | |
| CN111629313B (en) | Hearing device comprising loop gain limiter | |
| JP2024512778A (en) | Adaptive gain active noise reduction (ANR) device | |
| WO2022227982A1 (en) | Tws earphone and playing method and device of tws earphone | |
| GB2455823A (en) | Active noise cancellation filter cut-off frequency adjusted in accordance with magnitude of filter output signal | |
| CN113365176B (en) | Method and device for realizing active noise elimination and electronic equipment | |
| CN114697846A (en) | Hearing aid comprising a feedback control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210604 |
|
| RJ01 | Rejection of invention patent application after publication |