CN114040285B - Method and device for generating feedforward filter parameters of earphone, earphone and storage medium - Google Patents

Method and device for generating feedforward filter parameters of earphone, earphone and storage medium Download PDF

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Publication number
CN114040285B
CN114040285B CN202111131744.3A CN202111131744A CN114040285B CN 114040285 B CN114040285 B CN 114040285B CN 202111131744 A CN202111131744 A CN 202111131744A CN 114040285 B CN114040285 B CN 114040285B
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frequency response
sound transmission
transmission path
microphone
audio
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CN114040285A (en
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李罡
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Beijing Xiaomi Mobile Software Co Ltd
Beijing Xiaomi Pinecone Electronic Co Ltd
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Beijing Xiaomi Mobile Software Co Ltd
Beijing Xiaomi Pinecone Electronic Co Ltd
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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
    • 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
    • G10K11/1781—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17823—Reference signals, e.g. ambient acoustic environment
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
    • 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

Abstract

The disclosure relates to an information processing method, an information processing device, a generating device and a storage medium, comprising: acquiring a first environmental audio signal acquired by a feedforward microphone, wherein the feedforward microphone is arranged outside the earphone; obtaining first noise offset information corresponding to a first environmental audio signal according to the first environmental audio signal and a feedforward filter parameter, wherein the feedforward filter parameter is determined according to audio signals in a first sound transmission path and a second sound transmission path acquired in at least two wearing states, the first sound transmission path is a sound transmission path from a front microphone to a feedback microphone, and the second sound transmission path is a sound transmission path between a loudspeaker and the feedback microphone; and outputting a second audio signal played by the loudspeaker according to the first noise cancellation information and the first audio signal played by the loudspeaker, wherein the first audio signal is an original audio signal played by the loudspeaker. Thus, the noise reduction effect of the generating equipment is better.

Description

Method and device for generating feedforward filter parameters of earphone, earphone and storage medium
Technical Field
The disclosure relates to the technical field of active noise reduction, in particular to a feedforward filter parameter generation method and equipment of an earphone, the earphone and a storage medium.
Background
The active noise reduction earphone can utilize the filter to generate a noise elimination signal with the same amplitude and opposite phase to the noise signal, and the noise elimination wave and the noise wave interfere to achieve the effect of noise elimination. The filters in the noise reduction system of the active noise reduction earphone can be divided into a feedforward filter and a feedback filter, so that the noise reduction effect of the active noise reduction earphone is good or bad due to the cancellation effect of the filters on noise in the noise reduction system. Based on this, how to improve the noise reduction effect of the active noise reduction earphone through the filter in the active noise reduction system is a technical problem to be solved.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a method, an apparatus, an earphone and a storage medium for generating a feedforward filter parameter of an earphone, where the technical scheme is as follows:
according to a first aspect of an embodiment of the present disclosure, there is provided a method for generating a feedforward filter parameter of an earphone, where the earphone includes: the device comprises a feedforward microphone, a feedback microphone and a loudspeaker, wherein the feedforward microphone is arranged on the outer side of the earphone, and the feedback microphone is arranged on the inner side of the earphone; the method comprises the following steps:
Determining a first frequency response of a first sound transmission path according to a first audio signal of the feedforward microphone and a second audio signal of the feedback microphone in at least two first sound transmission paths acquired in wearing states, wherein the first sound transmission path is a sound transmission path from the feedforward microphone to the feedback microphone;
determining a second frequency response of a second sound transmission path according to a third audio signal of the loudspeaker and a fourth audio signal of the feedback microphone in the second sound transmission paths acquired by the at least two wearing states, wherein the second sound transmission path is a sound transmission path from the loudspeaker to the feedback microphone;
a feedforward filter parameter is determined from the first frequency response and the second frequency response.
In the above scheme, the method further comprises:
respectively acquiring R+Q fifth audio signals of the feedforward microphone in the first sound transmission path under Q times of the at least two wearing states of R testers; determining the first audio signal of the feedforward microphone according to R+Q fifth audio signals of the feedforward microphone; respectively acquiring R+Q sixth audio signals of the feedback microphone in the first acoustic transmission paths under the Q times of at least two wearing states of R testers; determining the second audio signals of the feedback microphone according to R+Q sixth audio signals of the feedback microphone, wherein R and Q are positive integers greater than or equal to 2;
And/or
Respectively acquiring S+L seventh audio signals of the loudspeaker in the second sound transmission path under the L times of at least two wearing states of S testers; determining the third audio signal of the loudspeaker according to the S+L seventh audio signals of the loudspeaker; respectively acquiring S+L eighth audio signals of the feedback microphones in the second sound transmission paths of the S testers in L times of at least two wearing states; and determining the fourth audio signal of the feedback microphone according to the S+L eighth audio signals of the feedback microphone, wherein S and L are positive integers which are more than or equal to 2.
In the above aspect, the first audio signal includes: a first audio sub-information of the feedforward microphone in the first sound transmission path collected in a standard wearing state and a third audio sub-information of the feedforward microphone in the first sound transmission path collected in a loose wearing state; the second audio signal includes: the second audio sub-information of the feedback microphone in the first sound transmission path acquired in the standard wearing state and the fourth audio sub-information of the feedback microphone in the first sound transmission path acquired in the loose wearing state;
The determining the first frequency response of the first sound transmission path according to the first audio signal of the feedforward microphone and the second audio signal of the feedback microphone in the first sound transmission path acquired by the at least two wearing states includes:
determining a third frequency response on the first sound transmission path in the quasi-wearing state and a fourth frequency response on the first sound transmission path in the relaxed-wearing state according to the first audio sub-information of the feedforward microphone and the second audio sub-information of the feedback microphone in the first sound transmission path acquired in the quasi-wearing state and the third audio sub-information of the feedforward microphone and the fourth audio sub-information of the feedback microphone respectively;
determining the first frequency response based on the third frequency response, a first weighting coefficient for the third frequency response, the fourth frequency response, and a second weighting coefficient for the fourth frequency response;
and/or the number of the groups of groups,
the third audio signal comprises: fifth audio sub-information of the microphone in the second sound transmission path collected in the standard wearing state and seventh audio sub-information of the microphone in the second sound transmission path collected in the loose wearing state; the fourth audio signal comprises: a sixth audio sub-information of the feedback microphone in the second sound transmission path collected in the standard wearing state and an eighth audio sub-information of the feedback microphone in the second sound transmission path collected in the relaxed wearing state;
The determining the second frequency response of the second sound transmission path according to the third audio signal of the speaker and the fourth audio signal of the feedback microphone in the second sound transmission path acquired by the at least two wearing states includes:
determining a fifth frequency response on the second sound transmission path in the standard wearing state and a sixth frequency response on the second sound transmission path in the relaxed wearing state according to the fifth audio sub-information of the speaker and the sixth audio sub-information of the feedback microphone in the second sound transmission path acquired in the standard wearing state, and according to the seventh audio sub-information of the speaker and the eighth audio sub-information of the feedback microphone acquired in the relaxed wearing state, respectively;
the second frequency response is determined based on the fifth frequency response, a third weighting coefficient for the fifth frequency response, the sixth frequency response, and a fourth weighting coefficient for the sixth frequency response.
In the above aspect, the determining the feedforward filter parameter according to the first frequency response and the second frequency response includes:
Determining a first target frequency response of the feedforward filter based on the first frequency response and the second frequency response;
the feedforward filter parameters are determined based on a first target frequency response of the feedforward filter.
In the above solution, the determining the feedforward filter parameter according to the first target frequency response of the feedforward filter includes:
performing minimum mean square error fitting on the first target frequency response of a preset frequency band according to the first target frequency response of the feedforward filter to obtain a second target frequency response of the feedforward filter, wherein different earphones correspond to different preset frequency bands;
determining the feedforward filter parameters from the second target frequency response of the feedforward filter.
In the above aspect, the determining the feedforward filter parameter according to the second target frequency response of the feedforward filter includes:
and calculating the parameters of the feedforward filter by using a Gaussian Newton iterative algorithm according to the second target frequency response of the feedforward filter.
According to a second aspect of embodiments of the present disclosure, there is provided an earphone comprising: the device comprises a loudspeaker, a feedforward filter and a controller, wherein feedforward filter parameters generated by adopting any method are stored in the feedforward filter;
The controller comprises a processor and a memory, wherein the memory is stored with a computer program;
the processor is used for calling a computer program on the memory and executing the following steps:
acquiring a first environmental audio signal acquired by the feedforward microphone;
obtaining first noise cancellation information corresponding to the first environmental audio signal according to the first environmental audio signal and the feedforward filter parameter;
and outputting a second audio signal played by the loudspeaker according to the first noise cancellation information and the first audio signal played by the loudspeaker, wherein the first audio signal is an original audio signal played by the loudspeaker.
In the above solution, the processor is configured to call a computer program on the memory, and further perform the following steps:
acquiring a second environmental audio signal acquired by the feedback microphone;
obtaining second noise cancellation information corresponding to the second environmental audio signal according to the second environmental audio signal and the feedback filter parameters;
and outputting the second audio signal played by the loudspeaker according to the first noise cancellation information, the second noise cancellation information and the first audio signal played by the loudspeaker.
According to a third aspect of the embodiments of the present disclosure, there is provided a feedforward filter parameter generating apparatus of an earphone, wherein the earphone includes: the device comprises a feedforward microphone, a feedback microphone and a loudspeaker, wherein the feedforward microphone is arranged on the outer side of the earphone, and the feedback microphone is arranged on the inner side of the earphone; the device comprises:
the first determining module is used for determining a first frequency response of a first sound transmission path according to a first audio signal of the feedforward microphone and a second audio signal of the feedback microphone in a first sound transmission path acquired in at least two wearing states, wherein the first sound transmission path is a sound transmission path from the feedforward microphone to the feedback microphone;
a second determining module, configured to determine a second frequency response of a second sound transmission path according to a third audio signal of the speaker and a fourth audio signal of the feedback microphone in the second sound transmission paths acquired in the at least two wearing states, where the second sound transmission path is a sound transmission path between the speaker and the feedback microphone;
And a third determining module, configured to determine a feedforward filter parameter according to the first frequency response and the second frequency response.
In the above scheme, the device further includes:
the first acquisition module is used for respectively acquiring R+Q fifth audio signals of the feedforward microphone in the first sound transmission path under the Q times of the at least two wearing states of R testers; determining a first audio signal of the feedforward microphone according to the R+Q fifth audio signals of the feedforward microphone; respectively acquiring R+Q sixth audio signals of the feedback microphone in the first sound transmission paths under the Q times of at least two wearing states of R testers; determining the second audio signals of the feedback microphone according to R+Q sixth audio signals of the feedback microphone, wherein R and Q are positive integers greater than or equal to 2;
and/or
A second acquisition module, configured to acquire s+l seventh audio signals of the speaker in the second sound transmission paths in the at least two wearing states for L times of S testers, respectively; determining the third audio signal of the loudspeaker according to the S+L seventh audio signals of the loudspeaker; respectively acquiring S+L eighth audio signals of the feedback microphones in the second sound transmission paths of the S testers in L times of at least two wearing states; and determining the fourth audio signal of the feedback microphone according to the S+L eighth audio signals of the feedback microphone, wherein S and L are positive integers which are more than or equal to 2.
In the above aspect, the first audio signal includes: a first audio sub-information of the feedforward microphone in the first sound transmission path collected in a standard wearing state and a third audio sub-information of the feedforward microphone in the first sound transmission path relaxed wearing state wipe; the second audio signal includes: the second audio sub-information of the feedback microphone in the first sound transmission path collected in the standard wearing state and the fourth audio sub-information of the feedback microphone in the first sound transmission path collected in the loose wearing state;
the first determining module further includes:
a first determining sub-module, configured to determine, according to the first audio sub-information of the feedforward microphone and the second audio sub-information of the feedback microphone in the first sound transmission path collected in a standard wearing state, and according to the third audio sub-information of the feedforward microphone and the fourth audio sub-information of the feedback microphone in the first sound transmission path collected in a loose wearing state, respectively, a third frequency response on the first sound transmission path in the standard wearing state and a fourth frequency response of the first sound transmission path in the loose wearing state;
A second determining sub-module for determining the first frequency response based on the third frequency response, a first weighting coefficient of the third frequency response, the fourth frequency response, and a second weighting coefficient of the fourth frequency response;
and/or the number of the groups of groups,
the third audio signal comprises: fifth audio sub-information of the microphone in the second sound transmission path collected in the standard wearing state and seventh audio sub-information of the microphone in the second sound transmission path collected in the relaxed wearing state; the fourth audio signal comprises: a sixth audio sub-information of the feedback microphone in the second sound transmission path collected in the standard wearing state and an eighth audio sub-information of the feedback microphone in the second sound transmission path collected in the relaxed wearing state;
a second determination module comprising:
a third determining sub-module configured to determine, according to the fifth audio sub-information of the speaker and the sixth audio sub-information of the feedback microphone in the second audio transmission path collected in the standard wearing state, and according to the seventh audio sub-information of the speaker and the eighth audio sub-information of the feedback microphone in the second audio transmission path collected in the loose wearing state, a fifth frequency response of the second audio transmission path in the standard wearing state, and a sixth frequency response of the second audio transmission path in the loose wearing state, respectively;
A fourth determination sub-module for determining the second frequency response based on the fifth frequency response, a third weighting coefficient of the fifth frequency response, the sixth frequency response, and a fourth weighting coefficient of the sixth frequency response.
In the above aspect, the third determining module includes:
a fifth determining sub-module for determining a first target frequency response of the feedforward filter based on the first frequency response and the second frequency response;
a sixth determination submodule is configured to determine the feedforward filter parameters based on the first target frequency response of the feedforward filter.
In the above aspect, the sixth determining submodule is further configured to:
performing minimum mean square error fitting on the first target frequency response of a preset frequency band according to the first target frequency response of the feedforward filter to obtain a second target frequency response of the feedforward filter, wherein the preset frequencies corresponding to different earphones are different;
determining the feedforward filter parameters from the second target frequency response of the feedforward filter.
In the above aspect, the sixth determining submodule is further configured to:
And calculating the parameters of the feedforward filter by using a Gaussian Newton iterative algorithm according to the second target frequency response of the feedforward filter.
According to a fourth aspect of embodiments of the present disclosure, there is provided an apparatus comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to: the feedforward filter parameter generating method of the earphone is realized when the method is executed.
In a fifth aspect of the disclosed embodiments, there is provided a non-transitory computer readable storage medium, which when executed by a processor of a generating device, causes the generating device to perform steps of a feedforward filter parameter generating method implementing any of the headphones described above.
The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects:
in the method for generating the feedforward filter of the earphone provided by the embodiment of the disclosure, the first frequency response of the first sound transmission is determined according to the first audio signal of the feedforward microphone and the second audio signal of the feedback microphone in the first sound transmission paths acquired in at least two wearing states, wherein the first sound transmission paths are sound transmission paths from the feedforward microphone to the feedback microphone; determining a second frequency response of the second sound transmission path according to a third audio signal of the loudspeaker and a fourth audio signal of the feedback microphone in the second sound transmission path acquired by the at least two wearing states, wherein the second sound transmission path is a sound transmission path from the loudspeaker to the feedback microphone; and finally, determining the feedforward filter parameters according to the first frequency response and the second frequency response. In this way, in this embodiment, since the feedforward filter parameters are determined according to the audio signals in the first sound transmission path and the second sound transmission path collected in at least two wearing states, the noise cancellation problem in different wearing states can be fully considered, so that the feedforward filter parameters can be calibrated in multiple scenes, the earphone that actively reduces noise by using the feedforward filter parameters can be adapted to various wearing scenes, and a better noise cancellation effect can be received in various wearing scenes, thereby providing a favorable basis for improving the hearing experience of the earphone that actively reduces noise by using the feedforward filter parameters.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flow chart illustrating a method of generating feedforward filter parameters for headphones according to an exemplary embodiment;
FIG. 2 is a schematic diagram of a scenario illustrating active noise reduction of headphones according to an example embodiment;
FIG. 3 is another flow chart illustrating feedforward filter parameter generation for an earphone according to an exemplary embodiment;
FIG. 4 is a further flowchart illustrating a method of generating feedforward filter parameters for headphones according to an exemplary embodiment;
FIG. 5 is a further flowchart illustrating a method of generating feedforward filter parameters for headphones according to an exemplary embodiment;
FIG. 6 is a specific flow diagram illustrating a method of earphone feedforward filter parameter generation according to an exemplary embodiment;
FIG. 7 is a block diagram illustrating a feedforward filter parameter generating apparatus of an earphone according to an exemplary embodiment;
Fig. 8 is a block diagram of a feedforward filter parameter generating apparatus of an earphone according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention. Rather, they are merely examples of apparatus and methods consistent with aspects of the invention as detailed in the accompanying claims.
Before describing the information processing method provided by the embodiments of the present disclosure, first, application scenarios related to the information processing method of each embodiment of the present disclosure are described. It should be noted that, the information processing method of the embodiment of the present disclosure is applied to an earphone with an active noise reduction system.
It will be appreciated that active noise reduction (Active Noise Cancellation, ANC) techniques, also known as active noise control (Active Noise Control, ANC) techniques, are techniques that achieve acoustic cancellation by emitting an acoustic signal that is opposite in phase, at the same frequency, amplitude, or as close as possible to the noise signal, and interfering with the noise signal. Active noise reduction techniques are commonly applied to headphones or car audio devices.
The earphone is an earphone integrated with the active noise reduction system, and may include, but is not limited to, a headset, an earplug-type earphone, or the like, and may be an earphone connected to a mobile terminal, an earphone connected to a fixed terminal, or an earphone connected to a vehicle-mounted intelligent device. Of course, any headset with an integrated active noise reduction system belongs to the headset described in the embodiments of the present disclosure.
The acoustic components and parts of the earphone of making an uproar mainly include: feedforward microphones, feedback microphones, speakers, etc., although some active noise reduction headphones may include a talk microphone. It will be appreciated that the feedforward microphone is typically located outside the earpiece for listening to the external ambient noise level and the feedback microphone is typically located near the speaker inside the earpiece for listening to the noise level near the auricle. The active noise reduction of the earphone is realized by matching feedforward filters of the feedforward microphone and the loudspeaker and matching feedback filters of the feedback microphone and the loudspeaker.
The embodiment of the disclosure aims to optimize the active noise reduction function of the active noise reduction earphone, in particular to optimize a feedforward filter used in the active noise reduction process so as to assist the earphone to perform active noise reduction better and improve the noise reduction effect.
Based on this, the present disclosure provides a method for generating feedforward filter parameters of an earphone, where the earphone includes: a feedforward microphone, a feedback microphone, and a speaker, wherein the feedforward microphone is installed outside the earphone and the feedback microphone is installed inside the earphone, fig. 1 is a flowchart of an information processing method according to an exemplary embodiment, and as shown in fig. 1, the method may include the steps of:
step 11: determining a first frequency response of a first sound transmission path according to a first audio signal of the feedforward microphone and a second audio signal of the feedback microphone in at least two first sound transmission paths acquired in wearing states, wherein the first sound transmission path is a sound transmission path from the feedforward microphone to the feedback microphone;
step 12: determining a second frequency response of a second sound transmission path according to a third audio signal of the loudspeaker and a fourth audio signal of the feedback microphone in the second sound transmission paths acquired by the at least two wearing states, wherein the second sound transmission path is a sound transmission path from the loudspeaker to the feedback microphone;
Step 13: a feedforward filter parameter is determined from the first frequency response and the second frequency response.
The feedforward microphone is provided outside the earphone, including being provided on a generating device connected to the earphone, or being provided on an outer surface of a housing of the earphone, or the like. In summary, the feedforward microphone is used to collect the ambient audio signal outside the headset.
The environmental audio signal herein refers to all audio signals present in the environment. By way of example, the ambient audio signal may include, but is not limited to: audio signals emitted by the earphone itself, audio signals emitted by other sound sources outside the earphone, audio signals reflected by a target object, such as a wall, and the like.
The feedback microphone is mounted near the speaker of the earphone and inside the earphone, for example, near the speaker inside the earphone, mainly for detecting noise near the speaker or near the auricle.
It can be understood that the design principle of the filter parameter is that the target frequency response of the filter is obtained according to the frequency response of the acoustic path to the earphone; the filter parameters are then determined from the target frequency response of the filter. In view of this, for setting the feedforward filter parameters, the frequency response in the acoustic path for the feedforward filter is considered first, then, based on the frequency response in the acoustic path, a target frequency response having the same or close phase as, frequency, amplitude in the acoustic path is obtained as the target frequency response of the feedforward filter, and then, the feedforward filter parameters are designed based on the target frequency response.
For example, referring to fig. 2, fig. 2 is a schematic diagram illustrating a scenario of active noise reduction of an earphone according to an exemplary embodiment, where, as shown in fig. 2, the design of feedforward filter parameters may take into account acoustic paths including: a first acoustic path and a second acoustic path. The first sound path here is a sound transmission path between the feedforward microphone and the feedback microphone, and the second sound path here is a sound transmission path between the speaker and the feedback microphone. It is understood that the audio signals in the acoustic path include, but are not limited to, volume in the acoustic path or frequency response in the acoustic path, etc. The first acoustic path is formed between the feedforward microphone and the feedback microphone, and is mainly an acoustic path for propagating environmental noise; the second acoustic path is mainly an acoustic path for propagating sound emitted from the speaker, since the second acoustic path is formed between the speaker and the feedback microphone.
Based on the active noise reduction technology, the feedforward filter needs to generate a sound signal with opposite phase, same frequency and amplitude or as close as possible to the external environment noise signal, so that the external environment noise signal can be effectively counteracted.
According to the embodiment of the disclosure, the frequency responses of the two sound transmission paths are considered when the feedforward filter is generated, and at least two wearing states are considered when the frequency responses of the two sound transmission paths are also considered, so that the generated feedforward filter parameters can fully consider the noise elimination problem under different wearing states, thereby being suitable for noise elimination of various wearing scenes, and further realizing better noise elimination effect when the feedforward filter parameters are utilized for noise elimination. The active noise reduction earphone utilizing the feedforward filter parameters can be suitable for various wearing states, and can achieve a good active noise elimination effect in various wearing states, thereby providing an advantageous foundation for improving the hearing experience of the earphone utilizing the feedforward filter parameters to actively reduce noise.
In some embodiments, in the test process of obtaining the audio signals of the first sound transmission path and the second sound transmission path, white noise and pink noise may be used as excitation sound sources to perform the test as environmental noise sources, so as to obtain the audio signals of the first sound transmission path and the second sound transmission path. To overcome the uncertainty of random noise and reduce noise points of amplitude and phase responses, in other embodiments, a logarithmic sweep (Logarithmic Sweep) signal is used as the excitation source to obtain the audio signals of the first and second acoustic transmission paths. The logarithmic sweep signal generally adopts a preset frequency bandwidth, for example, a logarithmic sweep signal with a frequency bandwidth of 20 Hz-20 kHz, and is subjected to any duration within a preset sweep duration, for example, the preset sweep duration is 2-4 seconds, and the sampling rate of the signal is not lower than 40kHz in consideration of the frequency bandwidth factor, and the common sampling rate of 44.1/48/192kHz and the like is generally selected. It will be appreciated that the predetermined frequency bandwidth is determined based on the frequency bandwidth of the common ambient noise, and the predetermined scan duration is determined based on test experience.
In some embodiments, in the process of acquiring the first audio signal of the feedforward microphone and the second audio signal of the feedback microphone in the first sound transmission path, the audio output of the earphone itself may be temporarily acquired, so that only the external excitation sound source is reserved to ensure accurate detection of the environmental noise.
In other implementations, the playing of the external excitation source may be paused during the process of obtaining the third audio signal of the speaker and the fourth audio signal of the feedback microphone in the second sound transmission path. Thus, only the sound source of the speaker is reserved to ensure accurate detection of noise inside the earphone.
It should be added that, in the process of acquiring the audio signals of the first sound transmission path and the second sound transmission path, that is, in the process of acquiring the frequency responses of the first sound transmission path and the second sound transmission path, a tester needs to test not only by adopting at least two wearing modes, but also by adopting different wearing modes and different sound transmission paths, the positions of the tester in the listening room are the same preset position, and the preset position can be the central position of the listening room or the central position surrounded by a plurality of feedforward microphones, etc. In this way, the accuracy of the test can be ensured, thereby providing an advantageous basis for generating feedforward filter parameters with higher versatility of noise reduction and better noise reduction effect.
In other embodiments, the method further comprises:
respectively acquiring R+Q fifth audio signals of the feedforward microphone in the first sound transmission path under Q times of the at least two wearing states of R testers; determining the first audio signal of the feedforward microphone according to R+Q fifth audio signals of the feedforward microphone; respectively acquiring R+Q sixth audio signals of the feedback microphone in the first acoustic transmission paths under the Q times of at least two wearing states of R testers; determining the second audio signals of the feedback microphone according to R+Q sixth audio signals of the feedback microphone, wherein R and Q are positive integers greater than or equal to 2;
and/or
Respectively acquiring S+L seventh audio signals of the loudspeaker in the second sound transmission path under the L times of at least two wearing states of S testers; determining the third audio signal of the loudspeaker according to the S+L seventh audio signals of the loudspeaker; respectively acquiring S+L eighth audio signals of the feedback microphones in the second sound transmission paths of the S testers in L times of at least two wearing states; and determining the fourth audio signal of the feedback microphone according to the S+L eighth audio signals of the feedback microphone, wherein S and L are positive integers which are more than or equal to 2.
Here, R and S may be the same or different. Q and L may be the same or different. It should be noted that, the more the number of testers R and/or S is, the more the audio signals of the respective acoustic components obtained correspondingly can be adapted to different usage objects, so that the earphone can be adapted to more users or usage scenarios when active noise is eliminated. Likewise, the more times of testing Q and/or L, the more accurately the audio signals of the respective acoustic components are correspondingly obtained, so as to provide an advantageous basis for providing a feedforward filter with better noise cancellation effect and higher versatility.
In the embodiment of the disclosure, the audio signals of the first sound transmission path and the second sound transmission path in at least two wearing states are tested for multiple times by using a plurality of testers, so that a foundation is laid for designing a feedforward filter with better noise elimination effect according to the audio signals of the first sound transmission path and the second sound transmission path.
In other embodiments, referring to fig. 3 and 4, the first audio signal includes: a first audio sub-information of the feedforward microphone in the first sound transmission path collected in a standard wearing state and a third audio sub-information of the feedforward microphone in the first sound transmission path collected in a loose wearing state; the second audio signal includes: the second audio sub-information of the feedback microphone in the first sound transmission path acquired in the standard wearing state and the fourth audio sub-information of the feedback microphone in the first sound transmission path acquired in the loose wearing state;
Step 11, namely, determining a first frequency response of the first sound transmission path according to the first audio signal of the feedforward microphone and the second audio signal of the feedback microphone in the first sound transmission path acquired according to the at least two wearing states, includes:
step 111: determining a third frequency response on the first sound transmission path in the quasi-wearing state and a fourth frequency response on the first sound transmission path in the relaxed-wearing state according to the first audio sub-information of the feedforward microphone and the second audio sub-information of the feedback microphone in the first sound transmission path acquired in the quasi-wearing state and the third audio sub-information of the feedforward microphone and the fourth audio sub-information of the feedback microphone respectively;
step 113: determining the first frequency response based on the third frequency response, a first weighting coefficient for the third frequency response, the fourth frequency response, and a second weighting coefficient for the fourth frequency response;
And/or the number of the groups of groups,
the third audio signal comprises: fifth audio sub-information of the microphone in the second sound transmission path collected in the standard wearing state and seventh audio sub-information of the microphone in the second sound transmission path collected in the loose wearing state; the fourth audio signal comprises: a sixth audio sub-information of the feedback microphone in the second sound transmission path collected in the standard wearing state and an eighth audio sub-information of the feedback microphone in the second sound transmission path collected in the relaxed wearing state;
said step 12 of determining said second frequency response of said second sound transmission path from said third audio signal of said speaker and said fourth audio signal of said feedback microphone in said second sound transmission path acquired from said at least two wearing states comprises:
step 122: determining a fifth frequency response on the second sound transmission path in the standard wearing state and a sixth frequency response on the second sound transmission path in the relaxed wearing state according to the fifth audio sub-information of the speaker and the sixth audio sub-information of the feedback microphone in the second sound transmission path acquired in the standard wearing state, and according to the seventh audio sub-information of the speaker and the eighth audio sub-information of the feedback microphone acquired in the relaxed wearing state, respectively;
Step 124: the second frequency response is determined based on the fifth frequency response, a third weighting coefficient for the fifth frequency response, the sixth frequency response, and a fourth weighting coefficient for the sixth frequency response.
For example, the first audio sub-information and the second audio sub-information may be time domain information. In some embodiments, determining the third frequency response on the first sound transmission path in the standard wearing state according to the first audio sub-information of the feedforward microphone and the second audio sub-information of the feedback microphone in the first sound transmission path acquired in the standard wearing state may include:
performing segmentation windowing time domain transformation on the first audio sub-information to obtain a frequency expression of the first audio sub-information; and calculating a corrected frequency chart of the second audio sub-information by using the frequency expression of the first audio sub-information, and finally, smoothing the corrected frequency chart of the second audio sub-information to obtain a third frequency response of the first sound transmission path in a standard wearing state.
Likewise, the third audio sub-information and the fourth audio sub-information may be time domain information. In some embodiments, the determining the fourth frequency response of the first sound transmission path in the loose wearing state according to the third audio sub-information of the feedforward microphone and the fourth audio sub-information of the feedback microphone in the loose wearing state may include:
Performing segmentation windowing time domain transformation on the third audio sub-information to obtain a frequency expression of the third audio sub-information; and calculating a corrected spectrogram of the fourth audio sub-information by using the frequency expression of the third audio sub-information, and finally smoothing the corrected spectrogram of the fourth audio sub-information to obtain a fourth frequency response of the first sound transmission path in a loose wearing state.
Likewise, the fifth audio sub-information and the sixth audio sub-information may be time domain information. In some embodiments, the determining the fifth frequency response of the second sound transmission path in the standard wearing state according to the fifth audio sub-information of the speaker in the second sound transmission path collected in the standard wearing state and the sixth audio sub-information of the feedback microphone may include:
performing segmentation windowing time domain transformation on the fifth audio sub-information to obtain a frequency expression of the fifth audio sub-information; and calculating a corrected spectrogram of the sixth audio sub-information by using the frequency expression of the sixth audio sub-information, and finally smoothing the corrected spectrogram of the sixth audio sub-information to obtain a fifth frequency response of the second audio transmission path in a standard wearing state.
Likewise, the seventh audio sub-information and the eighth audio sub-information may be time domain information. In some embodiments, the determining the sixth frequency response of the second sound transmission path in the relaxed wearing state according to the seventh audio sub-information of the speaker in the second sound transmission path collected in the relaxed wearing state and the seventh audio sub-information of the feedback microphone may include:
performing segmentation windowing time domain transformation on the seventh audio sub-information to obtain a frequency expression of the seventh audio sub-information; and calculating a corrected spectrogram of the eighth audio sub-information by using the frequency expression of the eighth audio sub-information, and finally smoothing the corrected spectrogram of the eighth audio sub-information to obtain a sixth frequency response of the second audio transmission path in a loose wearing state.
Illustratively, the first audio sub-information, the third audio sub-information, the fifth audio sub-information, and the seventh audio sub-information, respectively, that need to be windowed transformed are represented by uniform discrete data signals x (n). It will be appreciated that the x (n) is a time domain signal at discrete sample points of significant duration taken, and that the discrete data signal x (n) is subjected to a overlap window process, typically taking a 50% overlap window.
The window function w (n) may be a common Hann window (Hann Windows) or Hamming window (Hamming Windows), or the like. Let x (N) be divided into M blocks of signals after processing by overlapping window with window length N, wherein, the signal which can not reach length N is zero-added or omitted, the expression of single block signal is x m (n), m=1, 2., M, then the frequency domain expression X (k) corresponding to X (n) is:
where k is spectral line, e is natural constant, and j is imaginary part. Further can obtain X m (k) The corrected spectrogram of (2) is:
rounding is only necessary when the above formula N is not even. The frequency response TF (k) of the frequency domain transmission path, which is finally smoothed, is:
in this way, the third frequency response of the first sound transmission path in the standard wearing state and the fourth frequency response of the first sound transmission path in the loose wearing state can be calculated by the above-described unified calculation method. And calculating the fifth frequency response of the second sound transmission path in the standard wearing state and the sixth frequency response of the second sound transmission path in the loose wearing state by the unified calculation mode.
Further, the first frequency response is determined according to the third frequency response, the first weighting coefficient of the third frequency response, the fourth frequency response and the second weighting coefficient of the fourth frequency response obtained through calculation.
And further determining the second frequency response according to the calculated fifth frequency response, the third weighting coefficient of the fifth frequency response, the sixth frequency response and the fourth weighting coefficient of the sixth frequency response.
It should be noted that, the weighting coefficient may be determined according to the frequency of use of the wearing state, and it is understood that the higher the frequency of use of the wearing state, the higher the corresponding weighting coefficient.
It should be noted that the sum of the first weighting coefficient and the second weighting coefficient is 1, and the sum of the third weighting coefficient and the fourth weighting coefficient is 1.
Let P be i N (k) The frequency response TF (k) expression, P, of the first sound transmission path in the standard wearing state i L (k) The frequency response TF (k) expression of the first sound transmission path for the relaxed wearing state,the expression of the frequency response TF (k) of the second sound transmission path for the standard wearing state,/for the second sound transmission path>The frequency response TF (k) of the second sound transmission path in a relaxed wearing state. Alpha p For the expression of the first weighting factor, beta p Is the expression of the second weighting coefficient, alpha s For the expression of the third weighting factor, beta s For the fourth addition ofAn expression of the weight coefficient. Based on this, the first frequency response P of the first sound transmission path i (k) Second frequency response S of second sound transmission path i (k) The following equations 4 and 5 may be installed, respectively.
P i (k)＝α p P i N (k)+β p P i L (k),α p +β p ＝1 (4)
S i (k)＝α s S i N (k)+β s S i L (k),α s +β s ＝1 (5)
For example, taking the example that the first weighting coefficient is equal to the third weighting coefficient and the second weighting coefficient is equal to the fourth weighting coefficient, the values of the first weighting coefficient and the third weighting coefficient may be greater than the values of the second weighting coefficient and the fourth weighting coefficient in some embodiments, because the frequency of the standard wearing state is greater than the frequency of the loose wearing state. For example, take alpha p 、α s Is 0.7 beta p 、β s 0.3.
In other embodiments, referring to fig. 5, fig. 5 shows a further flowchart of a method for generating feedforward filter parameters of an earphone according to an exemplary embodiment, as shown in fig. 5, step 13, that is, determining the feedforward filter parameters according to the first frequency response and the second frequency response includes:
step 131: determining a first target frequency response of the feedforward filter based on the first frequency response and the second frequency response;
step 132: the feedforward filter parameters are determined based on a first target frequency response of the feedforward filter.
In some embodiments, to obtain a more accurate first target frequency response, the determining the first target frequency response of the feedforward frequency generator according to the first frequency response and the second frequency response may include:
Processing the first frequency response and the second frequency response respectively to obtain a processed first frequency response and a processed second frequency response;
a first target frequency response of the feedforward filter is determined using the processed first frequency response and the processed second frequency response.
Illustratively, processing the first frequency response and the second frequency response, respectively, may include: and respectively performing median screening processing on the first frequency response and the second frequency response to obtain a processed first frequency response and a processed second frequency response.
Exemplary, first frequency response P i (k) Second frequency response S i (k) The following median screening equations 6 and 7 are used to obtain the first frequency response P (k) after processing and the second frequency response S (k) after processing.
P(k)＝med{|P i (k)|},i＝1,2...,I (6)
S(k)＝med{|S i (k)|},i＝1,2...,I (7)
Wherein med {.. representing the frequency point k the modulus median of all values above. Of course, when multiple sets of filter parameters are needed, multiple sets of data at the representative distribution positions of 1/3 of the bits or 1/4 of the bits can be taken on the basis of the median as required, and the multiple sets of data can be modeled again independently and one by one according to gender and the like.
In some implementations, the first target frequency response of the feedforward filter may be understood as the total frequency response in the two acoustic transmission paths in the environment; the determining the feedforward filter parameter according to the first target frequency response of the feedforward filter includes: and according to the first target frequency response of the feedforward filter, taking the frequency response which is opposite in phase and same in amplitude frequency with the first target frequency response as the target frequency response of the feedforward filter, and then calculating according to the target frequency response to obtain the feedforward filter parameters.
Illustratively, determining a total frequency response in two sound transmission paths in the environment based on the first frequency response and the second frequency response includes: the total frequency response FF (k) in the two sound transmission paths in the environment is obtained according to the obtained processed first frequency response P (k) and the processed second frequency response S (k) by using the formula 8, and the first target frequency response FF (k) is obtained.
FF(k)＝P(k)/S(k) (8)
In other embodiments, the determining the feedforward filter parameters from the first target frequency response of the feedforward filter includes:
performing minimum mean square error fitting on the first target frequency response of a preset frequency band according to the first target frequency response of the feedforward filter to obtain a second target frequency response of the feedforward filter, wherein preset frequency bands corresponding to different earphones are different;
determining the feedforward filter parameters from the second target frequency response of the feedforward filter.
Illustratively, since the frequency point k has a correspondence with the physical frequency of formula 9:
f(k)＝(fs/N)k,k＝0,1,2,...,N/2,inHz (9)
therefore, the frequency characteristic weight Wt (k) may be set to 1 for the preset frequency band, and 0 for the first target frequency response of the non-preset frequency band. It will be appreciated that different headphones correspond to different preset frequencies. Usually, the active noise reduction earphone mainly takes a frequency point k in a frequency band of 50-1200 Hz. The frequency points in the exemplary 50-1200 Hz frequency band are Wt (k) =1, and the rest frequency points are Wt (k) =0. Based on this, the first target frequency response is subjected to minimum mean square error fitting by the formula 10, so that the second target frequency response to the feedforward filter can be accurately obtained.
It will be appreciated that the second target frequency response is the frequency response of the feedforward filter, such that the feedforward filter parameters of the feedforward filter are derived from the second target frequency response. In this way, in this embodiment, since the minimum mean square error fitting is performed on the first target frequency response of the preset frequency band, the second target frequency response of the feedforward filter is obtained, so that the parameters of the feedforward filter are obtained according to the second target frequency response, the obtained target frequency response of the feedforward filter can be more accurate, and the parameters of the feedforward filter can be obtained according to the more accurate second target frequency response, so that the noise cancellation effect is better when the active noise cancellation is performed based on the parameters of the feedforward filter. In addition, in the embodiment of the disclosure, only the first target frequency response of the preset frequency band is subjected to minimum mean square error fitting, so that on one hand, the calculated amount can be reduced, the processing speed can be improved, and on the other hand, the data processing can be more targeted, namely, the non-noise frequency band is eliminated, and thus, the accuracy of the obtained second target frequency response can be improved.
In other embodiments, the determining the feedforward filter parameters from the second target frequency response of the feedforward filter includes:
And calculating the parameters of the feedforward filter by using a Gaussian Newton iterative algorithm according to the second target frequency response of the feedforward filter.
Illustratively, the feedforward filter parameters are calculated using equation 11 in the gaussian iterative algorithm:
here, b, a are filter coefficients with calculated, OB is the order of b, and OA is the order of a; in some embodiments, ob=oa and is typically an even number for ease of hardware implementation. Of course, in other implementations, b, a may be broken down into several second order filters if only second order cascaded filters are supported in hardware.
In this way, in the embodiment of the present disclosure, the feedforward filter parameter is calculated by using the gaussian newton iterative algorithm through the second target frequency response of the feedforward filter, so that the calculated feedforward filter parameter is more accurate, and thus an advantageous basis can be provided for realizing a better noise reduction effect of active noise reduction.
The embodiment of the disclosure also provides an earphone, which comprises a loudspeaker, a feedforward filter and a controller, wherein the feedforward filter stores feedforward filter parameters generated by adopting any embodiment;
the controller comprises a processor and a memory, wherein the memory is stored with a computer program;
The processor is used for calling a computer program on the memory and executing the following steps:
acquiring a first environmental audio signal acquired by the feedforward microphone;
obtaining first noise cancellation information corresponding to the first environmental audio signal according to the first environmental audio signal and the feedforward filter parameter;
and outputting a second audio signal played by the loudspeaker according to the first noise cancellation information and the first audio signal played by the loudspeaker, wherein the first audio signal is an original audio signal played by the loudspeaker.
In this way, in the implementation of the present disclosure, by adopting the feedforward filter parameters in any embodiment, the earphone can fully consider the noise elimination in various wearing states when active noise elimination is performed, so that the earphone can adapt to the noise elimination in various wearing scenes, has better noise elimination effect in various wearing scenes, and improves the hearing experience of the earphone.
In other embodiments, the processor of the headset is configured to invoke a computer program on a memory, and further perform the steps of:
acquiring a second environmental audio signal acquired by the feedback microphone;
Obtaining second noise cancellation information corresponding to the second environmental audio signal according to the second environmental audio signal and the feedback filter parameters;
and outputting the second audio signal played by the loudspeaker according to the first noise cancellation information, the second noise cancellation information and the first audio signal played by the loudspeaker.
Therefore, the noise is actively reduced through the common parameters of the feedback filter, so that the noise reduction effect is improved.
Further, the embodiment of the disclosure further provides a specific embodiment to further understand the method for generating the feedforward filter parameters of the earphone and the earphone.
Referring to fig. 6, fig. 6 is a flowchart showing a method for generating parameters of an earphone feedforward filter according to an exemplary embodiment, as shown in fig. 5:
step 61: configuring an acoustic environment of a feedforward filter;
here, the configuration of the acoustic environment of the feedforward filter in step 61 includes the preparation of the environment of the listening room, and the preparation process of the tester, etc. before steps 11 and 12 described in the above embodiments.
Step 62: primary transfer path measurement;
the main transmission path here is the first sound transmission path described in the above embodiment. Here, the primary transfer path measurement is the acquisition of the first audio signal of the feedforward microphone and the acquisition of the second audio signal of the feedback microphone in the first sound transmission path described in the above embodiments.
Step 63: secondary transfer path measurement;
the secondary transmission path is the second transmission path described in the above embodiment. Here, the secondary transmission path measurement is the acquisition of the third audio signal of the speaker in the second audio transmission path and the acquisition of the fourth audio signal of the feedback microphone described in the above embodiments.
Step 64: post-processing data;
step 64 herein may correspond to equations 1, 2 and 3 of the above embodiment, namely, processing the collected data of the acoustic components in the respective primary and secondary transfer paths.
Step 65: modeling an acoustic path;
step 65 here may correspond to steps 11 and 12 described in the above embodiments.
Further, after acoustic path modeling, the method further comprises:
step 66: acquiring a first target frequency response of the feedforward filter;
step 67: weighting the frequency characteristics according to the first target frequency response;
step 68: and performing minimum mean square error fitting on the first target frequency response weighted by the frequency characteristics to obtain a second target frequency response.
It will be appreciated that step 65 herein may be implemented using equations 6, 7 and 8 above, step 57 may be implemented using equation 9 above, and step 68 may be implemented using equation 10 above.
And finally, calculating according to a Gaussian Newton iterative algorithm to obtain the feedforward filter parameters.
The feedforward filter parameters generated by the method of the embodiment have the advantages of high accuracy of acoustic path measurement, wide covered user plane and wide covered scene, so that the universality of the feedforward filter parameters is strong, the noise elimination effect of the feedforward filter on each scene is good, and the accuracy of the obtained feedforward filter parameters is high and the noise elimination effect is better due to fitting the first target frequency response.
Fig. 7 is a diagram illustrating a feedforward filter parameter generating apparatus of an earphone according to an exemplary embodiment, the earphone including: the device comprises a feedforward microphone, a feedback microphone and a loudspeaker, wherein the feedforward microphone is arranged on the outer side of the earphone, and the feedback microphone is arranged on the inner side of the earphone; referring to fig. 7, the apparatus includes:
a first determining module 71, configured to determine a first frequency response of a first sound transmission path according to a first audio signal of the feedforward microphone and a second audio signal of the feedback microphone in a first sound transmission path acquired in at least two wearing states, where the first sound transmission path is a sound transmission path between the feedforward microphone and the feedback microphone;
A second determining module 72, configured to determine a second frequency response of the second sound transmission path according to a third audio signal of the speaker and a fourth audio signal of the feedback microphone in the second sound transmission paths acquired in the at least two wearing states, where the second sound transmission path is a sound transmission path between the speaker and the feedback microphone;
a third determining module 73 is configured to determine feedforward filter parameters according to the first frequency response and the second frequency response.
In some alternative embodiments, the apparatus further comprises:
the first acquisition module is used for respectively acquiring R+Q fifth audio signals of the feedforward microphone in the first sound transmission path under the Q times of the at least two wearing states of R testers; determining a first audio signal of the feedforward microphone according to the R+Q fifth audio signals of the feedforward microphone; respectively acquiring R+Q sixth audio signals of the feedback microphone in the first sound transmission paths under the Q times of at least two wearing states of R testers; determining the second audio signals of the feedback microphone according to R+Q sixth audio signals of the feedback microphone, wherein R and Q are positive integers greater than or equal to 2;
And/or
A second acquisition module, configured to acquire s+l seventh audio signals of the speaker in the second sound transmission paths in the at least two wearing states for L times of S testers, respectively; determining the third audio signal of the loudspeaker according to the S+L seventh audio signals of the loudspeaker; respectively acquiring S+L eighth audio signals of the feedback microphones in the second sound transmission paths of the S testers in L times of at least two wearing states; and determining the fourth audio signal of the feedback microphone according to the S+L eighth audio signals of the feedback microphone, wherein S and L are positive integers which are more than or equal to 2.
In some alternative embodiments, the first audio signal comprises: a first audio sub-information of the feedforward microphone in the first sound transmission path collected in a standard wearing state and a third audio sub-information of the feedforward microphone in the first sound transmission path relaxed wearing state wipe; the second audio signal includes: the second audio sub-information of the feedback microphone in the first sound transmission path collected in the standard wearing state and the fourth audio sub-information of the feedback microphone in the first sound transmission path collected in the loose wearing state;
The first determining module 71 further includes:
a first determining sub-module, configured to determine, according to the first audio sub-information of the feedforward microphone and the second audio sub-information of the feedback microphone in the first sound transmission path collected in a standard wearing state, and according to the third audio sub-information of the feedforward microphone and the fourth audio sub-information of the feedback microphone in the first sound transmission path collected in a loose wearing state, respectively, a third frequency response on the first sound transmission path in the standard wearing state and a fourth frequency response of the first sound transmission path in the loose wearing state;
a second determining sub-module for determining the first frequency response based on the third frequency response, a first weighting coefficient of the third frequency response, the fourth frequency response, and a second weighting coefficient of the fourth frequency response;
and/or the number of the groups of groups,
the third audio signal comprises: fifth audio sub-information of the microphone in the second sound transmission path collected in the standard wearing state and seventh audio sub-information of the microphone in the second sound transmission path collected in the relaxed wearing state; the fourth audio signal comprises: a sixth audio sub-information of the feedback microphone in the second sound transmission path collected in the standard wearing state and an eighth audio sub-information of the feedback microphone in the second sound transmission path collected in the relaxed wearing state;
The second determination module 72 includes:
a third determining sub-module configured to determine, according to the fifth audio sub-information of the speaker and the sixth audio sub-information of the feedback microphone in the second audio transmission path collected in the standard wearing state, and according to the seventh audio sub-information of the speaker and the eighth audio sub-information of the feedback microphone in the second audio transmission path collected in the loose wearing state, a fifth frequency response of the second audio transmission path in the standard wearing state, and a sixth frequency response of the second audio transmission path in the loose wearing state, respectively;
a fourth determination sub-module for determining the second frequency response based on the fifth frequency response, a third weighting coefficient of the fifth frequency response, the sixth frequency response, and a fourth weighting coefficient of the sixth frequency response.
In some alternative embodiments, the third determining module 73 includes:
a fifth determining sub-module for determining a first target frequency response of the feedforward filter based on the first frequency response and the second frequency response;
A sixth determination submodule is configured to determine the feedforward filter parameters based on the first target frequency response of the feedforward filter.
In some alternative embodiments, the sixth determination submodule is further configured to:
performing minimum mean square error fitting on the first target frequency response of a preset frequency band according to the first target frequency response of the feedforward filter to obtain a second target frequency response of the feedforward filter, wherein the preset frequencies corresponding to different earphones are different;
determining the feedforward filter parameters from the second target frequency response of the feedforward filter.
In some alternative embodiments, the sixth determination submodule is further configured to:
and calculating the parameters of the feedforward filter by using a Gaussian Newton iterative algorithm according to the second target frequency response of the feedforward filter.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
Fig. 8 is a block diagram illustrating a feedforward filter parameter generating apparatus 800 of an earphone according to an exemplary embodiment. For example, the generating device 800 may be a mobile phone, computer, digital broadcast generating device, messaging device, game console, tablet device, medical device, exercise device, personal digital assistant, or the like.
Referring to fig. 8, a generating device 800 may include one or more of the following components: a processing component 802, a memory 804, a power component 806, a multimedia component 808, an audio component 810, an input/output (I/O) interface 812, a sensor component 814, and a communication component 816.
The processing component 802 generally controls overall operation of the generating device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 802 may include one or more processors 820 to execute instructions to perform all or part of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interactions between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.
The memory 804 is configured to store various types of data to support operations at the generating device 800. Examples of such data include instructions for any application or method operating on the generating device 800, contact data, phonebook data, messages, pictures, videos, and the like. The memory 804 may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
The power component 806 provides power to the various components of the generating device 800. Power components 806 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for generating device 800.
The multimedia component 808 includes a screen between the generating device 800 and the user that provides an output interface. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may sense not only the boundary of a touch or slide action, but also the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front camera and/or a rear camera. The front camera and/or the rear camera may receive external multimedia data when the generating device 800 is in an operational mode, such as a photographing mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.
The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the generating device 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may be further stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 further includes a speaker for outputting audio signals.
The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be a keyboard, click wheel, buttons, etc. These buttons may include, but are not limited to: homepage button, volume button, start button, and lock button.
The sensor assembly 814 includes one or more sensors to provide status assessment of various aspects of the generating device 800. For example, the sensor assembly 814 may detect an on/off state of the generating device 800, a relative positioning of components, such as a display and keypad of the generating device 800, the sensor assembly 814 may also detect a change in position of the generating device 800 or a component of the generating device 800, the presence or absence of a user's contact with the generating device 800, an orientation or acceleration/deceleration of the generating device 800, and a change in temperature of the generating device 300. The sensor assembly 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscopic sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 816 is configured to facilitate communication between the generating device 800 and other devices, either in a wired or wireless manner. The generating device 800 may access a wireless network based on a communication standard, such as WiFi,2G, or 3G, or a combination thereof. In one exemplary embodiment, the communication component 816 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the generating device 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for executing the methods described above.
In an exemplary embodiment, a non-transitory computer readable storage medium is also provided, such as memory 804 including instructions executable by processor 820 of generating device 800 to perform the above-described method. For example, the non-transitory computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.
A non-transitory computer-readable storage medium, which when executed by a processor of a generating device, causes the generating device to perform the information processing method described in the above embodiments.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (14)

1. A method for generating feedforward filter parameters of an earphone, the earphone comprising: the device comprises a feedforward microphone, a feedback microphone and a loudspeaker, wherein the feedforward microphone is arranged on the outer side of the earphone, and the feedback microphone is arranged on the inner side of the earphone; the method comprises the following steps:
Determining a first frequency response of a first sound transmission path according to a first audio signal of the feedforward microphone and a second audio signal of the feedback microphone in at least two first sound transmission paths acquired in wearing states, wherein the first sound transmission path is a sound transmission path from the feedforward microphone to the feedback microphone; wherein the first audio signal comprises: a first audio sub-information of the feedforward microphone in the first sound transmission path collected in a standard wearing state and a third audio sub-information of the feedforward microphone in the first sound transmission path collected in a loose wearing state; the second audio signal includes: the second audio sub-information of the feedback microphone in the first sound transmission path acquired in the standard wearing state and the fourth audio sub-information of the feedback microphone in the first sound transmission path acquired in the loose wearing state; the determining the first frequency response of the first sound transmission path according to the first audio signal of the feedforward microphone and the second audio signal of the feedback microphone in the first sound transmission path acquired by at least two wearing states includes: determining a third frequency response on the first sound transmission path in the quasi-wearing state and a fourth frequency response on the first sound transmission path in the relaxed-wearing state according to the first audio sub-information of the feedforward microphone and the second audio sub-information of the feedback microphone in the first sound transmission path acquired in the quasi-wearing state and the third audio sub-information of the feedforward microphone and the fourth audio sub-information of the feedback microphone respectively; determining the first frequency response based on the third frequency response, a first weighting coefficient for the third frequency response, the fourth frequency response, and a second weighting coefficient for the fourth frequency response;
Determining a second frequency response of a second sound transmission path according to a third audio signal of the loudspeaker and a fourth audio signal of the feedback microphone in the second sound transmission paths acquired by the at least two wearing states, wherein the second sound transmission path is a sound transmission path from the loudspeaker to the feedback microphone; wherein the third audio signal comprises: fifth audio sub-information of the microphone in the second sound transmission path collected in the standard wearing state and seventh audio sub-information of the microphone in the second sound transmission path collected in the loose wearing state; the fourth audio signal comprises: a sixth audio sub-information of the feedback microphone in the second sound transmission path collected in the standard wearing state and an eighth audio sub-information of the feedback microphone in the second sound transmission path collected in the relaxed wearing state; the determining the second frequency response of the second audio transmission path according to the third audio signal of the speaker and the fourth audio signal of the feedback microphone in the second audio transmission path acquired by the at least two wearing states includes: determining a fifth frequency response on the second sound transmission path in the standard wearing state and a sixth frequency response on the second sound transmission path in the relaxed wearing state according to the fifth audio sub-information of the speaker and the sixth audio sub-information of the feedback microphone in the second sound transmission path acquired in the standard wearing state, and according to the seventh audio sub-information of the speaker and the eighth audio sub-information of the feedback microphone acquired in the relaxed wearing state, respectively; determining the second frequency response based on the fifth frequency response, a third weighting coefficient of the fifth frequency response, the sixth frequency response, and a fourth weighting coefficient of the sixth frequency response;
A feedforward filter parameter is determined from the first frequency response and the second frequency response.
2. The method according to claim 1, wherein the method further comprises:
respectively acquiring R+Q fifth audio signals of the feedforward microphone in the first sound transmission path under Q times of the at least two wearing states of R testers; determining the first audio signal of the feedforward microphone according to R+Q fifth audio signals of the feedforward microphone; respectively acquiring R+Q sixth audio signals of the feedback microphone in the first sound transmission paths under the Q times of at least two wearing states of R testers; determining the second audio signals of the feedback microphone according to R+Q sixth audio signals of the feedback microphone, wherein R and Q are positive integers greater than or equal to 2;
and/or
Respectively acquiring S+L seventh audio signals of the loudspeaker in the second sound transmission path under the L times of at least two wearing states of S testers; determining the third audio signal of the loudspeaker according to the S+L seventh audio signals of the loudspeaker; respectively acquiring S+L eighth audio signals of the feedback microphones in the second sound transmission paths of the S testers in L times of at least two wearing states; and determining the fourth audio signal of the feedback microphone according to the S+L eighth audio signals of the feedback microphone, wherein S and L are positive integers which are more than or equal to 2.
3. The method of claim 1, wherein said determining said feedforward filter parameters from said first frequency response and said second frequency response comprises:
determining a first target frequency response of the feedforward filter based on the first frequency response and the second frequency response;
the feedforward filter parameters are determined based on a first target frequency response of the feedforward filter.
4. A method according to claim 3, wherein said determining said feedforward filter parameters from a first target frequency response of said feedforward filter comprises:
performing minimum mean square error fitting on the first target frequency response of a preset frequency band according to the first target frequency response of the feedforward filter to obtain a second target frequency response of the feedforward filter, wherein different earphones correspond to different preset frequency bands;
determining the feedforward filter parameters from the second target frequency response of the feedforward filter.
5. The method of claim 4, wherein said determining said feedforward filter parameters from said second target frequency response of said feedforward filter comprises:
And calculating the parameters of the feedforward filter by using a Gaussian Newton iterative algorithm according to the second target frequency response of the feedforward filter.
6. An earphone, comprising: a speaker, a feedforward filter, and a controller, the feedforward filter having stored therein feedforward filter parameters generated using the method of any one of claims 1 to 5;
the controller comprises a processor and a memory, wherein the memory is stored with a computer program;
the processor is used for calling a computer program on the memory and executing the following steps:
acquiring a first environmental audio signal acquired by the feedforward microphone;
obtaining first noise cancellation information corresponding to the first environmental audio signal according to the first environmental audio signal and the feedforward filter parameter;
and outputting a second audio signal played by the loudspeaker according to the first noise cancellation information and the first audio signal played by the loudspeaker, wherein the first audio signal is an original audio signal played by the loudspeaker.
7. The headset of claim 6, wherein the processor is configured to invoke a computer program on the memory, further performing the steps of:
Acquiring a second environmental audio signal acquired by the feedback microphone;
obtaining second noise cancellation information corresponding to the second environmental audio signal according to the second environmental audio signal and the feedback filter parameters;
and outputting the second audio signal played by the loudspeaker according to the first noise cancellation information, the second noise cancellation information and the first audio signal played by the loudspeaker.
8. A feedforward filter parameter generating apparatus for an earphone, the earphone comprising: the device comprises a feedforward microphone, a feedback microphone and a loudspeaker, wherein the feedforward microphone is arranged on the outer side of the earphone, and the feedback microphone is arranged on the inner side of the earphone; the device comprises:
the first determining module is used for determining a first frequency response of a first sound transmission path according to a first audio signal of the feedforward microphone and a second audio signal of the feedback microphone in a first sound transmission path acquired in at least two wearing states, wherein the first sound transmission path is a sound transmission path from the feedforward microphone to the feedback microphone; wherein the first audio signal comprises: a first audio sub-information of the feedforward microphone in the first sound transmission path collected in a standard wearing state and a third audio sub-information of the feedforward microphone in the first sound transmission path relaxed wearing state wipe; the second audio signal includes: the second audio sub-information of the feedback microphone in the first sound transmission path collected in the standard wearing state and the fourth audio sub-information of the feedback microphone in the first sound transmission path collected in the loose wearing state; the first determining module further includes:
A first determination sub-module and a second determination sub-module; the first determining submodule is configured to determine, according to the first audio sub-information of the feedforward microphone and the second audio sub-information of the feedback microphone in the first sound transmission path acquired in a standard wearing state, and according to the third audio sub-information of the feedforward microphone and the fourth audio sub-information of the feedback microphone in the first sound transmission path acquired in a loose wearing state, respectively, a third frequency response on the first sound transmission path in the standard wearing state and a fourth frequency response of the first sound transmission path in the loose wearing state; the second determining submodule is used for determining the first frequency response according to the third frequency response, the first weighting coefficient of the third frequency response, the fourth frequency response and the second weighting coefficient of the fourth frequency response;
a second determining module, configured to determine a second frequency response of a second sound transmission path according to a third audio signal of the speaker and a fourth audio signal of the feedback microphone in the second sound transmission paths acquired in the at least two wearing states, where the second sound transmission path is a sound transmission path between the speaker and the feedback microphone; the third audio signal comprises: fifth audio sub-information of the microphone in the second sound transmission path collected in the standard wearing state and seventh audio sub-information of the microphone in the second sound transmission path collected in the relaxed wearing state; the fourth audio signal comprises: a sixth audio sub-information of the feedback microphone in the second sound transmission path collected in the standard wearing state and an eighth audio sub-information of the feedback microphone in the second sound transmission path collected in the relaxed wearing state; the second determining module, the third determining sub-module and the fourth determining sub-module; the third determining submodule is configured to determine, according to the fifth audio sub-information of the speaker and the sixth audio sub-information of the feedback microphone in the second sound transmission path acquired in the standard wearing state, and according to the seventh audio sub-information of the speaker and the eighth audio sub-information of the feedback microphone in the second sound transmission path acquired in the loose wearing state, respectively, a fifth frequency response of the second sound transmission path in the standard wearing state and a sixth frequency response of the second sound transmission path in the loose wearing state; a fourth determination sub-module for determining the second frequency response based on the fifth frequency response, a third weighting coefficient of the fifth frequency response, the sixth frequency response, and a fourth weighting coefficient of the sixth frequency response;
And a third determining module, configured to determine a feedforward filter parameter according to the first frequency response and the second frequency response.
9. The apparatus of claim 8, wherein the apparatus further comprises:
the first acquisition module is used for respectively acquiring R+Q fifth audio signals of the feedforward microphone in the first sound transmission path under the Q times of the at least two wearing states of R testers; determining a first audio signal of the feedforward microphone according to the R+Q fifth audio signals of the feedforward microphone; respectively acquiring R+Q sixth audio signals of the feedback microphone in the first sound transmission paths under the Q times of at least two wearing states of R testers; determining the second audio signals of the feedback microphone according to R+Q sixth audio signals of the feedback microphone, wherein R and Q are positive integers greater than or equal to 2;
and/or
A second acquisition module, configured to acquire s+l seventh audio signals of the speaker in the second sound transmission paths in the at least two wearing states for L times of S testers, respectively; determining the third audio signal of the loudspeaker according to the S+L seventh audio signals of the loudspeaker; respectively acquiring S+L eighth audio signals of the feedback microphones in the second sound transmission paths of the S testers in L times of at least two wearing states; and determining the fourth audio signal of the feedback microphone according to the S+L eighth audio signals of the feedback microphone, wherein S and L are positive integers which are more than or equal to 2.
10. The apparatus of claim 8, wherein the third determination module comprises:
a fifth determining sub-module for determining a first target frequency response of the feedforward filter based on the first frequency response and the second frequency response;
a sixth determination submodule is configured to determine the feedforward filter parameters based on the first target frequency response of the feedforward filter.
11. The apparatus of claim 10, wherein the sixth determination submodule is further configured to:
performing minimum mean square error fitting on the first target frequency response of a preset frequency band according to the first target frequency response of the feedforward filter to obtain a second target frequency response of the feedforward filter, wherein preset frequencies corresponding to different earphones are different;
determining the feedforward filter parameters from the second target frequency response of the feedforward filter.
12. The apparatus of claim 11, wherein the sixth determination submodule is further configured to:
and calculating the parameters of the feedforward filter by using a Gaussian Newton iterative algorithm according to the second target frequency response of the feedforward filter.
13. A feedforward filter parameter generating apparatus of an earphone, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to: implementation-time performs the method of any of claims 1 to 5.
14. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that instructions in the storage medium, when executed by a processor of a feedforward filter parameter generating device of a headset, enable the feedforward filter parameter generating device of the headset to perform the method of any one of claims 1 to 5.
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