CN113891205A - Active noise reduction method and device for compensating earphone leakage and earphone - Google Patents
Active noise reduction method and device for compensating earphone leakage and earphone Download PDFInfo
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- CN113891205A CN113891205A CN202111101300.5A CN202111101300A CN113891205A CN 113891205 A CN113891205 A CN 113891205A CN 202111101300 A CN202111101300 A CN 202111101300A CN 113891205 A CN113891205 A CN 113891205A
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- 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
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
- G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/01—Hearing devices using active noise cancellation
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- Noise Elimination (AREA)
Abstract
The invention relates to an active noise reduction method and device for compensating earphone leakage and an earphone, wherein the active noise reduction method comprises the following steps: acquiring a first signal and a second signal, wherein the first signal comprises an environmental noise signal acquired by a feedforward microphone or a played audio signal, and the second signal is acquired by a feedback microphone under the action of the first signal; determining a current leakage state related parameter of the earphone based on the first signal and the second signal; based on the leakage state related parameters, determining the current frequency response curve by referring to the preset frequency response curves of the earphone in different leakage states; and determining the currently applicable noise reduction filter bank configuration for active noise reduction based on the current frequency response curve and the corresponding relation between the reference frequency response curve and the noise reduction filter configuration. The active noise reduction is carried out through the determined currently applicable noise reduction filter bank configuration, the active noise reduction can be realized without changing the wearing state of a user, and therefore the user experience of using the earphone is greatly improved.
Description
Technical Field
The present disclosure relates to signal processing technologies, and in particular, to an active noise reduction method and apparatus for compensating for headphone leakage, and a headphone.
Background
With this section of earphone, because the difference of everyone's ear and duct leads to the cavity to have the leakage of different degrees, the leakage can lead to the ANC effect variation of earphone, influences customer's the experience of making an uproar of falling.
In the existing scheme, the user can take the earphone tightly by sending a sound prompt after detecting leakage, so that a better noise reduction effect can be achieved after the user takes the earphone tightly. In the actual use process, the user is often required to wear the earphone to a degree of tightness suitable for noise reduction, for example, the earphone is tightened to cause discomfort, and in this case, the user is prompted to check the earphone, and the user can feel that the use experience of the earphone is poor. For example, the user wears the in-process at the earphone again because walking or the head rocks and causes the earphone not hard up to lead to letting out leakage quantity grow, repeatedly let the user inspect the earphone, also can bring user experience not well, even conflict in the use, bring not good impression for the product itself. However, in the actual situation, when the belt is not tightened (leakage), ANC effect is deteriorated, and noise reduction experience is not good. There is therefore a need for a method that can meet the noise reduction requirements of a user even in the event of leakage of the headset.
Disclosure of Invention
The active noise reduction method and device for compensating the earphone leakage and the earphone solve the contradiction between the leakage and the active noise reduction in the prior art, and therefore an ideal noise reduction effect can be achieved in a leakage state.
In a first aspect, embodiments of the present disclosure provide an active noise reduction method of compensating for leakage in a headphone having a feedforward microphone and a feedback microphone, comprising:
acquiring a first signal and a second signal, wherein the first signal comprises an ambient noise signal acquired by a feedforward microphone or a played audio signal, and the second signal is acquired by a feedback microphone under the action of the first signal;
determining a current leakage state related parameter of the earphone based on the first signal and the second signal;
based on the leakage state related parameters, determining a current frequency response curve by referring to preset frequency response curves of the earphone in different leakage states;
and determining the currently applicable noise reduction filter bank configuration for active noise reduction based on the current frequency response curve and the corresponding relation between the reference frequency response curve and the noise reduction filter configuration.
In a second aspect, embodiments of the present disclosure provide an earphone capable of compensating for leakage, including: a feedforward microphone configured to acquire an ambient noise signal; a feedback microphone configured to acquire a second signal; a processor configured to: determining a current leakage state related parameter of the headset based on a first signal and the second signal, wherein the first signal comprises the ambient noise signal or a played audio signal; based on the leakage state related parameters, determining a current frequency response curve by referring to preset frequency response curves of the earphone in different leakage states; and determining the currently applicable noise reduction filter bank configuration for active noise reduction based on the current frequency response curve and the corresponding relation between the reference frequency response curve and the noise reduction filter configuration.
In a third aspect, embodiments of the present disclosure provide an apparatus for compensating for headphone leakage, comprising a memory and a processor; the memory is configured to store a computer program, and the processor is configured to implement the steps of the active noise reduction method for compensating for headphone leakage according to the embodiments of the present disclosure when executing the computer program.
By using the active noise reduction method and device for compensating the leakage of the earphone and the earphone according to the embodiments of the present disclosure, a user does not need to be intentionally prompted to check the wearing condition of the earphone, active noise reduction is performed through the determined currently applicable noise reduction filter bank configuration, and active noise reduction can be realized without changing the wearing state of the user. Meanwhile, the active noise reduction method is based on the environmental noise or the played audio signal, and the detection process is also noninductive for the user, so that the experience of the user in using the earphone is greatly improved.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments generally by way of example and not by way of limitation, and together with the description and claims serve to explain the disclosed embodiments. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.
Fig. 1 shows a schematic diagram of an active noise reduction process of a headphone;
FIG. 2 illustrates a basic flow diagram of the active noise reduction method of the present disclosure to compensate for headphone leakage;
FIG. 3 illustrates frequency response curves for different leakage states in accordance with an embodiment of the disclosure;
FIG. 4 is a schematic diagram illustrating echo path estimation in the case of playing an audio signal according to an embodiment of the present disclosure;
FIG. 5 illustrates a general flow diagram of the active noise reduction method of the present disclosure to compensate for headphone leakage;
FIG. 6 shows a schematic diagram of the compensation effect at a leak of-15 dB using the noise reduction method of the present disclosure;
fig. 7 shows a basic structural diagram of the earphone capable of compensating for leakage of the present disclosure.
Detailed Description
For a better understanding of the technical aspects of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings. Embodiments of the present disclosure are described in further detail below with reference to the figures and the detailed description, but the present disclosure is not limited thereto.
The use of "first," "second," and similar terms in this disclosure are not intended to indicate any order, quantity, or importance, but rather are used for distinction. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered.
As shown in fig. 1, in general, the headphone 100 implements an active noise reduction process through a feed-forward path and a feedback path. To more fully describe the active noise reduction process, the following description is made in conjunction with the feedforward filter 111, the echo filter 112 and the feedback filter 113; it should be appreciated that each filter may be selectively enabled as the case may be (e.g., trade-off between power consumption, time required for noise reduction, and noise reduction effect). Typically, the feedforward filter 111 is enabled, and the echo filter 112 and the feedback filter 113 are selectively enabled.
In some embodiments, in the feedforward path, the feedforward microphone 101a may collect the ambient noise, and the ambient noise collected by the feedforward microphone 101a may include an audio component leaked to the surrounding environment when the speaker 107 of the earphone 100 plays the audio signal, in addition to the noise generated by the surrounding environment, and the audio component becomes 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. Subsequently, the ambient noise signal passing through the first low-pass and down-sampling filter 104a is filtered by a feedforward filter. The filtered ambient signal is transmitted to the adder 109, and then is processed by digital-to-analog conversion of the digital-to-analog converter 106, and then is played by the speaker 107. 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, on the feedback path, the feedback 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, the echo filter 112 is used to cancel the audio echo signal generated after the audio signal to be broadcast 105 is played by the loudspeaker 107, and then the audio signal to be broadcast 105 filtered by the echo filter 112 is sent to the subtractor 110. The subtractor 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 on the feedback path is no longer affected by the audio echo signal. The subtractor 110 then transmits the integrated noise signal to the feedback filter 113 for filtering to achieve feedback noise reduction. The feedback-filtered noise signal is transmitted to the adder 109 through the limiter 108, and is processed by digital-to-analog conversion in the digital-to-analog converter 106 and then played by the speaker 107.
The above is based on the working principle of actively reducing noise of the earphone of the embodiment of the present disclosure, and the noise on the feedforward path and the feedback path is filtered respectively, so that the active noise reduction function of the earphone can be realized, the noise reduction effect of the earphone is improved, and the listening experience of a user is improved. Fig. 2 shows a basic flowchart of the active noise reduction method for compensating for earphone leakage of the present disclosure, which is applied to an earphone having a feedforward microphone and a feedback microphone, and the active noise reduction method for compensating for earphone leakage of the present disclosure starts with step S201 of acquiring a first signal and a second signal, where the first signal includes an ambient noise signal acquired by the feedforward microphone or a played audio signal, and the second signal is acquired by the feedback microphone under the action of the first signal. The method disclosed by the invention can make the user feel more imperceptible in use by using the ambient noise signal or the played music signal as the first signal, for example, when the user plays music, the audio signal can be directly extracted as the first signal. In this way, a specified audio signal can not be played through the earphone additionally, which causes discomfort in user experience.
Next, in step S202, a current leakage state related parameter of the earphone is determined based on the first signal and the second signal. The leakage state related parameter may be determined, for example, by means of determining the current transfer function of the earpiece. In step S203, based on the parameters related to the leakage state, a current frequency response curve is determined by referring to preset frequency response curves of the earphone in different leakage states. As shown in fig. 3, the earphone has frequency response curves corresponding to its leakage states in different leakage states, which can be obtained under test environments. And determining the currently worn frequency response curve by comparing the determined current leakage state parameters.
Finally, in step S204, based on the current frequency response curve, the currently applicable noise reduction filter bank configuration is determined to perform active noise reduction with reference to the corresponding relationship between the frequency response curve and the noise reduction filter configuration.
The method disclosed by the invention does not need to repeatedly prompt the user to check the wearing state of the earphone, and the user can wear the earphone in a comfortable wearing manner to determine the configuration of the filter to actively reduce noise. The method of the present disclosure uses the ambient noise or the audio signal as the first signal, and the feedback microphone acquires the second signal under the action of the first signal, so that the current frequency response curve of the user can be determined, and in this way, the currently applicable noise reduction filter bank configuration is determined for active noise reduction. According to the method, the insensibility in the detection process is realized without playing an ultra-low frequency signal such as an infrasonic signal, and the user is not required to be repeatedly prompted to check the wearing state of the earphone, so that the insensibility in the noise reduction process is also realized, and the best earphone using experience is brought to the user.
In the case that the first signal is a play audio signal, the step S201 of acquiring the first signal and the second signal includes: and acquiring the played audio signal of the designated frequency band as the first signal, and acquiring a second audio signal received by a feedback microphone as the second signal. As shown in fig. 4, the audio signal x (n) (the first signal) of the specific frequency band being played can be directly acquired, and after digital-to-analog conversion, the audio signal enters a speaker to realize music playing. The second audio signal can be obtained by feedback of the ear canal structure. Referring to fig. 4, the second signal y (n) can be obtained after analog-to-digital conversion of the ear canal feedback signal. By selecting the audio signal of the designated frequency band as the first signal, the echo path estimation can be conveniently carried out through the audio signal of the designated frequency band in the subsequent step. Meanwhile, in the use scene of playing music, the user does not feel the detection process of the method, and the wearing experience of the user is improved.
In case the first signal is a play audio signal, determining a current leakage state related parameter of the headphone based on the first signal and the second signal comprises: estimating echo path parameters of the headset based on the first signal and the second signal; and determining the current leakage state related parameters of the earphone according to the estimated echo path parameters. As shown in fig. 4, the echo path parameters of the earphone may be estimated based on the audio signal x (n) and the second signal y (n), and the specific echo path estimation method may be implemented by using the existing scheme, which is not described herein. And determining the configuration of the noise reduction filter bank according with the current use scene of the user by determining the relevant parameters of the leakage state, thereby providing good noise reduction experience for the user under the condition of not changing the wearing mode of the user.
In some cases, the user does not play audio although wearing the headset, and in such a scenario, the user also wants to obtain a good noise reduction effect, and the existing scheme cannot achieve an experience of noise reduction without feeling. The method of the present disclosure, in the case where the first signal employs an ambient noise signal acquired by a feedforward microphone, acquiring the first signal and the second signal comprises: a first noise signal of a specified frequency band in an environment is detected as the first signal by a feedforward microphone, and a second noise signal detected by a feedback microphone is detected as the second signal. For example, the second noise signal may be detected by the feedback microphone after the first noise signal is denoised via the current noise reduction filter configuration. In this way, a strong correlation exists between the second signal and the first signal, so that the current leakage state related parameter can be conveniently determined through the first signal and the second signal.
In the case where the first signal is an ambient noise signal acquired with a feedforward microphone, determining a current leakage state related parameter of the headset based on the first signal and the second signal may include: and determining a target monitoring quantity based on the first noise signal and the second noise signal, wherein the target monitoring quantity is used for defining the matching degree of the noise reduction filter configuration of the earphone and the leakage state, and the target monitoring quantity approaches to zero as the matching degree is better. In some embodiments the target monitoring amount satisfies:
wherein detVal represents target monitoring quantity, i represents sampling serial number, and specific sampling can determine Noise _ data according to sampling time contexti，Noise_dataiA signal obtained by filtering the first noise signal of the specified frequency band acquired by the feedforward microphone by a feedforward filter and an echo path filter, Error _ dataiRepresenting the corresponding second noise signal picked up by the feedback microphone. The matching degree of the current noise reduction filter configuration and the leakage state can be represented by the value of detVal, if detVal is negative, the filter gain is over large, and the larger the value is, the more the gain is over, the compensation amount needs to be reduced. If detVal is positive, it means that the filter gain is too small, and a larger absolute value of the value means that more gain needs to be compensated. By the method, the matching degree of the current configuration of the noise reduction filter bank and the current leakage state can be accurately shown, and the configuration of the noise reduction filter bank can be adjusted without being adjusted when the configuration approaches 0.
In some embodiments, determining the current leakage state related parameter of the earphone based on the first signal and the second signal specifically comprises: determining whether the first signal is above a first threshold; in case said first signal is higher than a first threshold value, the determination of the current leakage state related parameter of the earphone is only initiated. As shown in fig. 5, for example, it may be first detected whether music is being played, and in the case of not being played, it may be determined whether ambient noise is greater than a first threshold, and in the case of being greater than the first threshold, a first noise signal of a specified frequency band in the environment may be detected as a first signal by a feedforward microphone, and a second noise signal detected by a feedback microphone may be detected as a second signal, and then N-fold down-sampling may be performed on the first signal and the second signal, respectively, and the N-fold down-sampled signals may be filtered by band pass filters, respectively, and leakage correlation parameters may be calculated based thereon. Similarly, when the user is playing music, whether the audio signal is greater than a preset first threshold value is judged, and when the audio signal is greater than the first threshold value, the audio signal of the specified frequency band is acquired and the second signal is acquired through the feedback microphone. And carrying out N-time down sampling on the obtained first signal and the second signal, carrying out echo path estimation on the signals subjected to the N-time down sampling, and determining leakage related parameters.
As shown in fig. 5, specifically, determining the current leakage state related parameter of the earphone based on the first signal and the second signal may further include: determining whether the first signal is below a second threshold; in case the first signal is below a second threshold and active noise reduction processing of the headphone is in progress, the filter configuration is kept unchanged or restored to a default value. In some embodiments, the second threshold may be set separately from the first threshold, or may be set the same, and is not limited to one according to actual needs. That is, in an actual application scenario, when no music signal is played, the environmental noise in the specified frequency band may be monitored, and if the energy of the environmental noise is lower than a threshold, the self-adaptation is stopped or the default value is set. If the value is higher than the threshold value, the current target monitoring quantity is obtained according to a detVal calculation formula, the leakage condition is determined, and the configuration of the corresponding noise reduction filter bank is selected. When music is played and the intensity of the music signal is higher than a threshold value, the music signal is adopted as a monitoring signal, an echo path is estimated, the leakage condition is judged according to the frequency response of the echo path, and the corresponding noise reduction filter bank configuration is selected. When the intensity of the music signal is lower than the threshold value, self-adaption can be stopped or default setting can be recovered, so that the active noise reduction can be prevented from being started by mistake, and discomfort in experience can be caused under the condition of the active noise reduction.
By using the active noise reduction method for compensating the leakage of the earphone according to the embodiment of the disclosure, the compensation effect when the leakage amount is-15 dB is shown in fig. 6, and compared with the noise reduction effect of the default noise reduction filter bank and the effect after the adaptive active noise reduction compensation, it can be seen from fig. 6 that the noise reduction amount around 350Hz is improved by about 20dB at most, and the experience of the user in using the earphone is obviously improved.
The disclosed embodiment also provides an earphone capable of compensating for leakage, as shown in fig. 7, including: a feedforward microphone 101a configured to acquire an ambient noise signal; a feedback microphone 101b configured to acquire a second signal; a processor 701 configured to: determining a current leakage state related parameter of the headset based on a first signal and the second signal, wherein the first signal comprises the ambient noise signal or a played audio signal; based on the leakage state related parameters, determining a current frequency response curve by referring to preset frequency response curves of the earphone in different leakage states; and determining the currently applicable noise reduction filter bank configuration for active noise reduction based on the current frequency response curve and the corresponding relation between the reference frequency response curve and the noise reduction filter configuration.
In the case where the first signal is a play audio signal, the processor 701 is further configured to: and acquiring the played audio signal of the designated frequency band as the first signal, and acquiring a second audio signal received by a feedback microphone as the second signal.
The processor 701 is further configured to: estimating echo path parameters of the headset based on the first signal and the second signal; and determining the current leakage state related parameters of the earphone according to the estimated echo path parameters.
In the case where the first signal is an ambient noise signal acquired with a feedforward microphone, the processor 701 is further configured to: a first noise signal of a specified frequency band in an environment is detected as the first signal by a feedforward microphone, and a second noise signal detected by a feedback microphone is detected as the second signal.
The processor 701 is further configured to: and determining a target monitoring quantity based on the first noise signal and the second noise signal, wherein the target monitoring quantity is used for defining the matching degree of the noise reduction filter configuration of the earphone and the leakage state, and the target monitoring quantity approaches to zero as the matching degree is better.
In some embodiments, the target monitoring amount satisfies:
wherein detVal represents target monitoring quantity, i represents sampling sequence number, Noise _ dataiA signal obtained by filtering the first noise signal of the specified frequency band acquired by the feedforward microphone by a feedforward filter and an echo path filter, Error _ dataiRepresenting the corresponding second noise signal picked up by the feedback microphone.
In some embodiments, determining the current leakage state related parameter of the earphone based on the first signal and the second signal specifically comprises: determining whether the first signal is above a first threshold; in case said first signal is higher than a first threshold value, the determination of the current leakage state related parameter of the earphone is only initiated.
In some embodiments, determining the current leakage state related parameter of the earphone based on the first signal and the second signal specifically comprises: determining whether the first signal is below a second threshold; in case the first signal is below a second threshold and active noise reduction processing of the headphone is in progress, the filter configuration is kept unchanged or restored to a default value.
The embodiment of the present disclosure further provides an apparatus for compensating leakage of an earphone, including a memory and a processor; the memory is configured to store a computer program, and the processor is configured to implement the steps of the active noise reduction method for compensating for headphone leakage according to the embodiments of the present disclosure when executing the computer program. The processor in this embodiment may be a custom microprocessor, and more specifically, the processor may be a Complex Instruction Set Computing (CISC) microprocessor, a Reduced Instruction Set Computing (RISC) microprocessor, a Very Long Instruction Word (VLIW) microprocessor, a processor running other instruction sets, or a processor running a combination of instruction sets. The processor may also be one or more special-purpose processing devices such as an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a Digital Signal Processor (DSP), a system on a chip (SoC), or the like. The memory may be, for example, read-only memory (ROM), random-access memory (RAM), phase-change random-access memory (PRAM), static random-access memory (SRAM), dynamic random-access memory (DRAM), electrically erasable programmable read-only memory (EEPROM), other types of random-access memory (RAM), flash disk or other forms of flash memory, cache, registers, static memory, compact disk read-only memory (CD-ROM), Digital Versatile Disks (DVD) or other optical storage, magnetic cassettes or other magnetic storage devices, or any other potentially non-transitory medium that may be used to store information or instructions that may be accessed by a computer device, and the like.
Moreover, although exemplary embodiments have been described herein, the scope thereof includes any and all embodiments based on the disclosure with equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or alterations. The elements of the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.
The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the foregoing detailed description, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a disclosed feature not claimed is essential to any claim. Rather, the subject matter of the present disclosure may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
The above embodiments are only exemplary embodiments of the present disclosure, and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalents may be made thereto by those skilled in the art within the spirit and scope of the present disclosure, and such modifications and equivalents should be considered to be within the scope of the present invention.
Claims (10)
1. An active noise reduction method for compensating for leakage in a headphone having a feedforward microphone and a feedback microphone, comprising:
acquiring a first signal and a second signal, wherein the first signal comprises an ambient noise signal acquired by a feedforward microphone or a played audio signal, and the second signal is acquired by a feedback microphone under the action of the first signal;
determining a current leakage state related parameter of the earphone based on the first signal and the second signal;
based on the leakage state related parameters, determining a current frequency response curve by referring to preset frequency response curves of the earphone in different leakage states;
and determining the currently applicable noise reduction filter bank configuration for active noise reduction based on the current frequency response curve and the corresponding relation between the reference frequency response curve and the noise reduction filter configuration.
2. The active noise reduction method for compensating for headphone leakage according to claim 1, wherein in the case where the first signal is a broadcast audio signal, obtaining the first signal and the second signal comprises:
and acquiring the played audio signal of the designated frequency band as the first signal, and acquiring a second audio signal received by a feedback microphone as the second signal.
3. The active noise reduction method for compensating for headphone leakage according to claim 2, wherein determining a current leakage state related parameter of a headphone based on the first signal and the second signal comprises:
estimating echo path parameters of the headset based on the first signal and the second signal;
and determining the current leakage state related parameters of the earphone according to the estimated echo path parameters.
4. The active noise reduction method for compensating for headphone leakage according to claim 1, wherein in the case where the first signal is an ambient noise signal acquired using a feedforward microphone, acquiring the first signal and the second signal comprises:
a first noise signal of a specified frequency band in an environment is detected as the first signal by a feedforward microphone, and a second noise signal detected by a feedback microphone is detected as the second signal.
5. The active noise reduction method for compensating for headphone leakage according to claim 4, wherein determining a current leakage state related parameter of a headphone based on the first signal and the second signal comprises:
and determining a target monitoring quantity based on the first noise signal and the second noise signal, wherein the target monitoring quantity is used for defining the matching degree of the noise reduction filter configuration of the earphone and the leakage state, and the target monitoring quantity approaches to zero as the matching degree is better.
6. The active noise reduction method for compensating for earphone leakage according to claim 5, wherein the target monitoring amount satisfies:
wherein detVal represents target monitoring quantity, i represents sampling sequence number, Noise _ dataiA signal obtained by filtering the first noise signal of the specified frequency band acquired by the feedforward microphone by a feedforward filter and an echo path filter, Error _ dataiRepresenting the corresponding second noise signal picked up by the feedback microphone.
7. The active noise reduction method for compensating for headphone leakage according to claim 1, wherein determining the current leakage state related parameters of the headphone based on the first signal and the second signal specifically comprises:
determining whether the first signal is above a first threshold;
in case said first signal is higher than a first threshold value, the determination of the current leakage state related parameter of the earphone is only initiated.
8. The active noise reduction method for compensating for headphone leakage according to claim 1, wherein determining the current leakage state related parameters of the headphone based on the first signal and the second signal specifically comprises:
determining whether the first signal is below a second threshold;
in case the first signal is below a second threshold and active noise reduction processing of the headphone is in progress, the filter configuration is kept unchanged or restored to a default value.
9. An earphone capable of compensating for leakage, comprising:
a feedforward microphone configured to acquire an ambient noise signal;
a feedback microphone configured to acquire a second signal;
a processor configured to:
determining a current leakage state related parameter of the headset based on a first signal and the second signal, wherein the first signal comprises the ambient noise signal or a played audio signal;
based on the leakage state related parameters, determining a current frequency response curve by referring to preset frequency response curves of the earphone in different leakage states;
and determining the currently applicable noise reduction filter bank configuration for active noise reduction based on the current frequency response curve and the corresponding relation between the reference frequency response curve and the noise reduction filter configuration.
10. An apparatus for compensating for headphone leakage comprising a memory and a processor; wherein the memory is configured to store a computer program, and the processor is configured to implement the steps of the active noise reduction method for compensating for headphone leakage according to any one of claims 1 to 8 when executing the computer program.
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