CN114501211A - Active noise reduction circuit with liyin permeability, method, equipment and storage medium - Google Patents

Active noise reduction circuit with liyin permeability, method, equipment and storage medium Download PDF

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Publication number
CN114501211A
CN114501211A CN202011267480.XA CN202011267480A CN114501211A CN 114501211 A CN114501211 A CN 114501211A CN 202011267480 A CN202011267480 A CN 202011267480A CN 114501211 A CN114501211 A CN 114501211A
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audio signal
noise reduction
active noise
circuit
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余立志
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Actions Technology Co Ltd
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Actions Technology 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
    • 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

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The invention discloses an active noise reduction circuit, a method, equipment and a storage medium with liyin permeability, which are used for solving the technical problem that a user can not clearly hear specific sound in the environment while actively reducing the environmental noise in the prior art, and the active noise reduction circuit comprises: the active noise reduction unit is used for actively reducing noise of the picked-up first audio signal to obtain an inverse audio signal with a phase opposite to that of the ambient noise; the sub-band noise reduction unit is used for sub-band noise reduction of a second audio signal picked up from the external environment to obtain a third audio signal with the steady-state noise reduced by the external environment; wherein the first audio signal and the second audio signal are picked up simultaneously; and the signal output unit is used for modulating the inverted audio signal and the third audio signal to obtain a fourth audio signal subjected to noise reduction.

Description

Active noise reduction circuit with liyin permeability, method, equipment and storage medium
Technical Field
The present invention relates to the field of electronic technologies, and in particular, to an active noise reduction circuit, method, device, and storage medium with rich tone permeability.
Background
Currently, an active noise reduction earphone generally includes a depth noise reduction mode, a pass-through mode, and a noise reduction off mode.
In the field of consumer electronics headsets, the goal of the transparent mode is mainly to allow the wearer to hear the sound of the external environment even without taking off the headset, such as to listen to the speaker's voice and some important prompts smoothly.
In the prior art, the pass-through mode of the active noise reduction earphone is to monitor the ambient sound by using the feedforward path of the active noise reduction by measuring the sound transfer function from the feedforward microphone to the eardrum of the ear canal when the earphone is worn or not worn. While this allows the wearer to hear the desired voice and audible sounds in the environment, it also allows the wearer to hear undesired ambient noise. Especially in the case of high stationary noise, the use of such a transparent mode will affect the comfort and intelligibility of the conversation by the wearer.
Therefore, it is an urgent technical problem to provide a user with a clear hearing of specific sounds in the environment while actively reducing the environmental noise.
Disclosure of Invention
The invention provides an active noise reduction circuit with liyin permeability, a method, equipment and a storage medium, which are used for solving the technical problem that a user can not clearly hear specific sound in the environment while actively reducing environmental noise in the prior art.
In a first aspect, to solve the above technical problem, an embodiment of the present invention provides an active noise reduction circuit with a peaker permeability, which includes:
the active noise reduction unit is used for actively reducing noise of the picked-up first audio signal to obtain an inverse audio signal with a phase opposite to that of the ambient noise;
the sub-band noise reduction unit is used for sub-band noise reduction of a second audio signal picked up from the external environment to obtain a third audio signal with the steady-state noise reduced by the external environment; wherein the first audio signal and the second audio signal are picked up simultaneously;
and the signal output unit is used for modulating the inverted audio signal and the third audio signal to obtain a fourth audio signal subjected to noise reduction.
In one possible embodiment, the active noise reduction unit includes:
a fixed active noise reduction circuit or a self-adaptive active noise reduction circuit, and a compensation filter connected between the sub-band noise reduction unit and the fixed active noise reduction circuit or the self-adaptive active noise reduction circuit;
the fixed active noise reduction circuit is the inverse audio signal obtained by actively reducing noise of the first audio signal by using fixed noise reduction parameters, and the adaptive active noise reduction circuit is the inverse audio signal obtained by actively reducing noise of the first audio signal by using adaptive coefficients; the compensation filter is used for processing the third audio signal and inputting the processed third audio signal into the fixed active noise reduction circuit or the adaptive active noise reduction circuit so as to eliminate the third audio signal in the first audio signal.
In one possible embodiment, the fixed active noise reduction circuit includes:
a feedforward filter circuit, or any or all of the feedforward filter circuit and the feedback filter circuit; the feedforward filter circuit is used for generating an inverse audio signal with a phase opposite to that of noise in the external environment, and the feedback filter circuit is used for generating an inverse audio signal with a phase opposite to that of the noise in the ear canal environment.
In a possible implementation, when the first audio signal includes a sub audio signal picked up from the external environment, the second audio signal is obtained by down-sampling the sub audio signal.
In a possible implementation manner, the sub-band noise reduction unit is further configured to superimpose the received playing audio to the sub-band noise-reduced audio signal to obtain the third audio signal.
In a second aspect, an embodiment of the present invention provides an active noise reduction method with rich tone permeability, including:
actively reducing noise of the picked-up first audio signal to obtain an inverse audio signal with a phase opposite to that of the ambient noise;
performing sub-band noise reduction on a second audio signal picked up from the external environment to obtain a third audio signal with steady-state noise reduced by the external environment; wherein the first audio signal and the second audio signal are picked up simultaneously;
and modulating the reversed phase audio signal and the third audio signal to obtain a fourth audio signal subjected to noise reduction.
A possible implementation of actively noise reducing a picked-up first audio signal to obtain an inverted audio signal in phase opposition to ambient noise, comprises:
performing signal compensation on the first audio signal by using the third audio signal to eliminate the third audio signal contained in the first audio signal, and obtaining a compensated audio signal;
carrying out fixed active noise reduction or self-adaptive active noise reduction on the compensated audio signal to obtain the inverse audio signal; wherein the fixed active noise reduction comprises one or both of feedforward filtering and feedback filtering.
One possible implementation of sub-band noise reduction on a second audio signal picked up from an external environment to obtain a third audio signal with steady-state noise removed from the external environment, includes:
when the first audio signal comprises a sub audio signal picked up from the external environment, performing down sampling on the sub audio signal to obtain a second audio signal;
and carrying out sub-band noise reduction on the second audio signal to obtain the third audio signal.
In a third aspect, an embodiment of the present invention provides an electronic device, including the active noise reduction circuit with rich tone permeability according to the first aspect.
In a fourth aspect, an embodiment of the present invention provides a readable storage medium, including:
a memory for storing a plurality of data to be transmitted,
the memory is for storing instructions that, when executed by the processor, cause an apparatus comprising the readable storage medium to perform the method of the second aspect.
Through the technical solutions in one or more of the above embodiments of the present invention, the embodiments of the present invention have at least the following technical effects:
in the embodiment provided by the invention, the phase-reversed audio signal opposite to the phase of the environmental noise is obtained by actively reducing the noise of the picked-up first audio signal by using the active noise reduction unit; performing sub-band noise reduction on a second audio signal picked up from the external environment by using a sub-band noise reduction unit to obtain a third audio signal with the external environment subjected to steady-state noise reduction; wherein the first audio signal and the second audio signal are picked up simultaneously; modulating the inverted audio signal and the third audio signal by using a signal output unit to obtain a fourth audio signal subjected to noise reduction; therefore, the sound of the external environment after the steady-state noise is reduced can be heard while the environmental noise is reduced through the active noise reduction circuit.
Drawings
FIG. 1 is a schematic diagram of signal processing by a sub-band noise reduction unit;
fig. 2 is a schematic structural diagram of an active noise reduction circuit with rich tone permeability according to an embodiment of the present invention;
fig. 3 is a first schematic structural diagram of an active noise reduction unit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an active noise reduction unit according to an embodiment of the present invention;
FIG. 5 is a first schematic diagram of an implementation circuit of the feedforward filter circuit according to the embodiment of the invention;
FIG. 6 is a second schematic diagram of an implementation circuit structure of a feedforward filter circuit according to an embodiment of the present invention;
fig. 7 is a first schematic diagram illustrating an achievable circuit structure of the feedback filter circuit according to the embodiment of the present invention;
fig. 8 is a schematic diagram of a second circuit structure of a feedback filter circuit according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a first circuit structure of an adaptive active noise reduction circuit according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a second circuit structure of an adaptive active noise reduction circuit according to an embodiment of the present invention;
FIG. 11 is a first schematic diagram illustrating an achievable circuit structure of a sub-band denoising unit according to an embodiment of the present invention;
FIG. 12 is a schematic diagram of a second circuit structure of a sub-band denoising unit according to an embodiment of the present invention;
FIG. 13 is a third schematic diagram of an achievable circuit structure of the subband noise reduction circuit according to the embodiment of the present invention;
FIG. 14 is a schematic diagram of a fourth circuit structure of a subband noise reduction circuit according to an embodiment of the present invention;
fig. 15 is a schematic diagram of an achievable circuit structure of a signal output unit according to an embodiment of the present invention;
FIG. 16 is a first schematic diagram illustrating an implementation of an active noise reduction circuit with liqor-sound permeability according to an embodiment of the present invention;
fig. 17 is a schematic diagram of a second circuit structure of an active noise reduction circuit with rich tone permeability according to an embodiment of the present invention;
fig. 18 is a flowchart of an active noise reduction method with peaker permeability according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention provide an active noise reduction circuit, method, device and storage medium with a peaker permeability, so as to solve the technical problem that an active noise reduction earphone in the prior art can only reduce ambient noise.
Before the scheme of the present invention is introduced, the basic principle of the sub-band noise reduction unit used in the present invention is introduced:
please refer to fig. 1, which is a schematic diagram of the subband denoising unit for signal processing.
The subband denoising unit adopts a subband denoising algorithm based on a weighted overlap-add (WOLA) filter bank frame, and the subband denoising algorithm comprises the following steps: by an analysis filter (H)1(z)～Hm(z)) and a decimator (L), a subband signal processing module, and a WOLA synthesis module comprising an interpolator and a synthesis filter. The WOLA analysis module decomposes a time domain input signal (xn) into a group of complex value sub-band time frequency signals (x) with equal bandwidth1(Ln)～xm(Ln)), and the WOLA synthesis module combines the plurality of subband signals (v)1(n)～vm(n)) is restored to a time domain signal (y (n)).
WOLA is a flexible subband processing method, and can flexibly adjust the balance of time delay, distortion and operand. For the occasion with low delay requirement, the WOLA can reduce the delay by reducing the number of sub-bands and analyzing the lengths of the filter and the synthesis filter, easily reduce the delay to be within 1ms, and meet the requirement of ultralow delay under the transparent effect. The subband signal processing module is mainly used for calculating noise reduction filtering weight and controlling dynamic range. The noise reduction filtering weight can be calculated by using a known noise estimation algorithm (such as minimum tracking, recursive averaging, and the like) and a voice denoising algorithm (such as spectral subtraction, wiener filtering, statistical weighting, and the like), and the dynamic range control mainly prevents the human ear from being damaged by sound breaking and excessive volume of the audio.
In order to solve the technical problems, the general idea of the embodiment of the present application is as follows:
there is provided an active noise reducing headphone with litonne permeability, comprising: the active noise reduction unit is used for actively reducing noise of the picked-up first audio signal to obtain an inverse audio signal with a phase opposite to that of the ambient noise; the sub-band noise reduction unit is used for sub-band noise reduction of a second audio signal picked up from the external environment to obtain a third audio signal in the external environment after steady-state noise reduction; wherein the first audio signal and the second audio signal are picked up simultaneously; and the signal output unit is used for modulating the reversed-phase audio signal and the third audio signal to obtain a fourth audio subjected to noise reduction.
Since in the above scheme, the phase-reversed audio signal opposite to the phase of the ambient noise is obtained by actively denoising the picked-up first audio signal with the active denoising unit; performing sub-band noise reduction on a second audio signal picked up from the external environment by using a sub-band noise reduction unit to obtain a third audio signal with the steady-state noise of the external environment reduced; wherein the first audio signal and the second audio signal are picked up simultaneously; modulating the inverted audio signal and the third audio signal by using a signal output unit to obtain a fourth audio signal subjected to noise reduction; therefore, the active noise reduction circuit can hear the sound of the external environment after the steady-state noise is reduced while reducing the environmental noise.
In order to better understand the technical solutions of the present invention, the following detailed descriptions of the technical solutions of the present invention are provided with the accompanying drawings and the specific embodiments, and it should be understood that the specific features in the embodiments and the examples of the present invention are the detailed descriptions of the technical solutions of the present invention, and are not limitations of the technical solutions of the present invention, and the technical features in the embodiments and the examples of the present invention may be combined with each other without conflict.
Referring to fig. 2, a schematic structural diagram of an active noise reduction circuit with rich tone permeability according to an embodiment of the present invention is shown, the active noise reduction circuit includes:
and the active noise reduction unit 10 is used for actively reducing noise of the picked-up first audio signal to obtain an inverse audio signal with a phase opposite to that of the ambient noise.
A subband denoising unit 20, configured to perform subband denoising on a second audio signal picked up from an external environment, to obtain a third audio signal with steady-state noise removed in the external environment; wherein the first audio signal and the second audio signal are picked up simultaneously.
It should be understood that the first audio signal is picked up from the environment, and the environment corresponding to the first audio signal may be one or both of the external environment and the ear canal environment, and is not limited herein; the second audio signal is picked up from the external environment, and the third audio signal with the steady-state noise removed by the external environment can be obtained after the sub-band noise reduction is carried out on the second audio signal. Third audio signals including all non-steady sound sources, such as voice, warning tone, siren sound and the like, can be obtained by reducing steady sound sources in the external environment, and the reduction of the steady sound sources can be realized by adjusting parameters in the subband noise reduction.
Through carrying out subband noise reduction on the second audio signal, the collected second audio signal can be divided into a plurality of subbands to be denoised, so that delay is reduced, a good noise reduction effect is achieved, and echoes are prevented from being generated when sound is played again.
And the signal output unit 30 is configured to modulate the inverted audio signal with the third audio signal to obtain a fourth audio signal after noise reduction.
The active noise reduction circuit in the embodiment of the invention can be used for earphone products, communication equipment, wearable equipment and the like.
Obtaining an inverse audio signal having a phase opposite to that of the ambient noise by actively noise-reducing the picked-up first audio signal with the active noise reduction unit 10; meanwhile, the sub-band noise reduction unit 20 is used for sub-band noise reduction of the second audio signal picked up from the external environment, and a third audio signal with steady-state noise reduced by the external environment is obtained; finally, the inverted audio signal and the third audio signal are modulated by the signal output unit 30 to obtain a fourth audio signal after noise reduction; therefore, the active noise reduction circuit can clearly hear the sound of the environment after the steady-state noise is reduced while reducing the environmental noise, and the technical effect of sound penetration is realized.
Referring to fig. 3 and 4, fig. 3 is a first structural schematic diagram of an active noise reduction unit according to an embodiment of the present invention, and fig. 4 is a second structural schematic diagram of the active noise reduction unit according to an embodiment of the present invention.
The active noise reduction unit 10 includes a fixed active noise reduction circuit 101 or an adaptive active noise reduction circuit 102, and a compensation filter 103 connected between the subband noise reduction unit 20 and the fixed active noise reduction circuit 101 or the adaptive active noise reduction circuit 102.
The fixed active noise reduction circuit 101 is a reverse audio signal obtained by actively reducing noise of a first audio signal by using fixed noise reduction parameters, and the adaptive active noise reduction circuit 102 is a reverse audio signal obtained by actively reducing noise of the first audio signal by using adaptive coefficients; the compensation filter 103 is configured to process the third audio signal and input the processed third audio signal to the fixed active noise reduction circuit 101 or the adaptive active noise reduction circuit 102, so as to eliminate the third audio signal in the first audio signal.
In fig. 3, the active noise reduction unit 10, which is composed of the fixed active noise reduction circuit 101 and the compensation filter 103, can rapidly perform active noise reduction on the first audio signal and the third audio signal processed by the compensation filter 103 to obtain an inverted audio signal.
In fig. 4, the active noise reduction unit 10, which is composed of the adaptive active noise reduction circuit 102 and the compensation filter 103, can automatically adjust the adaptive parameters according to the characteristics of the ambient noise, and actively reduce the noise of the first audio signal and the third audio signal processed by the compensation filter 103 to obtain an inverted audio signal.
It should be noted that, since the first audio signal includes signals corresponding to the ambient sound and/or the audio playing sound, these signals may be attenuated by active noise reduction without being processed. Therefore, the active noise reduction unit 10 needs to be provided with a compensation filter 103, and the signal output by the sub-band noise reduction unit 20 is sent to the compensation filter 103 for processing, and then is superimposed with the third audio signal for noise reduction.
A fixed active noise reduction circuit 101 comprising:
any or all of a feedforward filter circuit and a feedback filter circuit; wherein the feedforward filter is configured to generate an inverse audio signal having a phase opposite to a noise in an external environment, and the feedback filter is configured to generate an inverse audio signal having a phase opposite to a noise in an ear canal environment.
Referring to fig. 5 and fig. 6, fig. 5 is a schematic diagram of an achievable circuit structure of a feedforward filter circuit according to an embodiment of the present invention, and fig. 6 is a schematic diagram of a achievable circuit structure of a feedforward filter circuit according to an embodiment of the present invention.
In fig. 5, the active noise reduction circuit 101 is formed by a feedforward filter circuit 101a, the feedforward filter circuit 101a may include a first adder (S1) and a feedforward filter connected in sequence, one input terminal of the first adder (S1) is configured to receive the first audio signal, the other input terminal of the first adder is configured to receive the third audio signal processed by the compensation filter 103, an output terminal of the first adder (S1) is connected to an input terminal of the feedforward filter, and the feedforward filter is configured to process the received signal to obtain an inverse audio signal.
Referring to fig. 6, the feedforward filtering circuit 101a may further include a first sampling circuit for sampling sounds in the external environment to obtain a first audio signal.
When the fixed active noise reduction circuit 101 is configured by the feedforward filter circuit 101a, the first audio signal is an audio signal corresponding to sound in the external environment.
Referring to fig. 7 and 8, fig. 7 is a schematic diagram of an achievable circuit structure of the feedback filter circuit according to the embodiment of the present invention, and fig. 8 is a schematic diagram of an achievable circuit structure of the feedback filter circuit according to the embodiment of the present invention.
In fig. 7, the active noise reduction circuit 101 is formed by a feedback filter circuit 101b, the feedback filter circuit 101b may include a second adder (S2) and a feedback filter connected in sequence, one input terminal of the second adder (S2) is configured to receive the first audio signal, the other input terminal of the second adder is configured to receive the third audio signal processed by the compensation filter 103, an output terminal of the second adder (S2) is connected to an input terminal of the feedback filter, and the feedback filter is configured to process the received signal to obtain an inverted audio signal.
Referring to fig. 8, the feedback filter circuit 101b may further include a second sampling circuit for sampling the sound in the ear canal environment to obtain the first audio signal.
When the fixed active noise reduction circuit 101 is configured by the feedback filter circuit 101b, the first audio signal is an audio signal corresponding to sound in the ear canal environment.
When the active noise reduction circuit 101 is formed by the feedforward filter circuit 101a and the feedback filter circuit 101b, the structural composition of the feedforward filter circuit 101a and the feedback filter circuit 101b can be respectively shown in fig. 5 and 6, and fig. 7 and 8.
When the fixed active noise reduction circuit 101 is configured by the feedforward filter circuit 101a and the feedback filter circuit 101b, the first audio signal includes an audio signal corresponding to sound in the external environment and an audio signal corresponding to sound in the ear canal environment, the audio signal corresponding to sound in the external environment is input to the feedforward filter circuit 101a, the audio signal corresponding to sound in the ear canal environment is input to the feedback filter circuit 101b, and the inverted audio signal includes signals output by the feedforward filter 101a and the feedback filter 101 b.
Referring to fig. 9, which is a schematic diagram of a first circuit structure of an adaptive active noise reduction circuit provided in an embodiment of the present invention, an adaptive active noise reduction circuit 102 includes two adders (S3, S4) and adaptive filters respectively connected to the two adders, one input end of a third adder (S3) is configured to receive an audio signal corresponding to sound in an external environment in a first audio signal, and the other end of the third adder receives an audio signal obtained by processing the third audio signal with a compensation filter 103 a; one input end of the fourth adder (S4) is used for receiving the audio signal corresponding to the sound in the ear canal environment in the first audio signal, and the other end of the fourth adder receives the audio signal obtained by processing the third audio signal by the compensation filter 103b, and the compensation filter 103a and the compensation filter 103b form the compensation filter 103.
Referring to fig. 10, a schematic diagram of a circuit structure of an adaptive active noise reduction circuit according to an embodiment of the present invention may be shown, where the adaptive active noise reduction circuit 102 may further include a first sampling circuit and a second sampling circuit, an output end of the first sampling circuit is connected to a third adder (S3), and an output end of the first sampling circuit is connected to a fourth adder (S4), so that the adaptive active noise reduction circuit 102 may directly collect a first audio signal from an environment and perform adaptive active filtering, thereby achieving the purpose of adaptive active noise reduction.
Fig. 11 is a schematic diagram of a first circuit structure of a subband denoising unit according to an embodiment of the present invention.
The sub-band noise reduction unit 20 includes a first down-sampling circuit (down-sampling 1), a sub-band noise reducer, and a first up-sampling circuit (up-sampling 1) connected in sequence, where the sub-band noise reducer is configured to perform sub-band noise reduction processing on the audio signal down-sampled by the first down-sampling circuit to obtain an audio signal with the environment reduced by the steady-state noise, and the audio signal is up-sampled by the first up-sampling circuit to obtain a third audio signal.
Fig. 12 is a schematic diagram of a second circuit structure of a subband denoising unit according to an embodiment of the present invention.
The sub-band denoising unit 20 may further include a fifth adder (S5), where the fifth adder (S5) is connected between the sub-band denoising unit and the up-sampling 1, and is configured to add the sub-band denoised audio signal and the playing audio signal together, and send the audio signal to the up-sampling 1 for up-sampling processing, so as to obtain a third audio signal, where the third audio signal includes both the audio signal obtained by reducing the ambient noise and the steady-state noise and the playing audio signal.
When the first audio signal includes a sub-audio signal picked up from the external environment, the second audio signal is obtained by down-sampling the sub-audio signal, i.e. the sampling circuit of the sub-band noise reduction circuit may multiplex the first sampling circuit in the active noise reduction unit 10.
Referring to fig. 13 and fig. 14, fig. 13 is a schematic diagram of a third circuit structure of the sub-band denoising unit according to the embodiment of the present invention, and fig. 14 is a schematic diagram of a fourth circuit structure of the sub-band denoising unit according to the embodiment of the present invention.
As shown in fig. 13, it is assumed that the active noise reduction unit 10 includes a fixed active noise reduction circuit 101 composed of a feedforward filter circuit 101a and a feedback filter circuit 101b, and when the subband noise reduction unit includes down-sampling 1, a sampling circuit corresponding to the down-sampling 1 multiplexes a first sampling circuit of the feedforward filter circuit 101 a.
It should be noted that, if the active noise reduction unit 10 includes the feedforward filter circuit 101a, the first audio signal may be down-sampled to obtain the second audio signal.
As shown in fig. 14, it is assumed that the active noise reduction unit 10 includes an adaptive active noise reduction circuit 102, and when the subband noise reduction circuit includes down-sampling 1, the sampling circuit corresponding to down-sampling 1 multiplexes the first sampling circuit of the adaptive active noise reduction circuit 102.
It should be noted that, since the active noise reduction unit 10 and the sub-band noise reduction unit 20 have a plurality of structural forms, the connection modes thereof are also various in different structural forms, and accordingly, the form of multiplexing the sampling circuit in the active noise reduction unit 10 by the sub-band noise reduction unit 20 is also various, and it should not be understood that the present invention is limited to the cases shown in fig. 14 and fig. 15.
Referring to fig. 15, which is a schematic diagram of an achievable circuit structure of the signal output unit according to the embodiment of the present invention, the signal output unit 30 includes a sixth adder (S6), a second up-sampling circuit (up-sampling 2), a digital-to-analog conversion circuit (D/a), and a speaker (S7) connected in sequence. The sixth adder (S6) is configured to add the inverse audio signal output by the active noise reduction unit 10 and the third audio signal output by the sub-band noise reduction unit 20 together, send the added signal to the up-sampling circuit 2 to obtain a signal with a sampling rate suitable for the analog-to-digital conversion circuit, convert the third audio signal into an analog signal through the analog-to-digital conversion circuit, and play the analog signal by a speaker, so that a user can hear a sound obtained by reducing the steady-state noise in the external environment.
If the third audio signal only comprises the audio signal with the steady-state noise removed by the external environment, the user can hear the sound with the steady-state noise removed by the external environment; if the third audio signal further includes a playing audio, the user can hear the sound after the steady-state noise is removed from the external environment while hearing the sound corresponding to the playing audio.
In order to fully understand the active noise reduction circuit in the present application, a few typical circuit configurations are provided, please refer to fig. 16-17.
Fig. 16 is a schematic diagram of a first circuit structure of the active noise reduction circuit with liqophone permeability according to the embodiment of the present invention, and fig. 17 is a schematic diagram of a second circuit structure of the active noise reduction circuit with liqophone permeability according to the embodiment of the present invention.
Assuming that the active noise reduction unit 10 includes a fixed active noise reduction circuit 101 composed of a feedforward filter circuit 101a and a feedback filter circuit 101b, a subband noise reduction unit 20, and a signal output unit 30, an active noise reduction circuit composed of them is shown in fig. 16.
Assuming that the active noise reduction unit 10 includes an adaptive active noise reduction circuit 102, a sub-band noise reduction unit 20 and a signal output unit 30, the active noise reduction circuit composed of them is shown in fig. 17.
Fig. 16 and 17 are schematic diagrams showing the structure of the active noise reduction circuit in a monaural device (e.g., a telephone, a monaural headset, etc.), and for a binaural device (e.g., a binaural headset, a wearable device, etc.), two identical active noise reduction circuits as shown in fig. 16 or 17 may be used.
Based on the same inventive concept, an embodiment of the present invention provides an active noise reduction method with stereo permeability, please refer to fig. 18, which includes:
step 1801: and actively reducing the noise of the picked-up first audio signal to obtain an inverted audio signal with the phase opposite to that of the ambient noise.
The following can be adopted:
performing signal compensation on the first audio signal by using the third audio signal to eliminate the third audio signal contained in the first audio signal and obtain a compensated audio signal; carrying out fixed active noise reduction or self-adaptive active noise reduction on the compensated audio signal to obtain an inverse audio signal; wherein the fixed active noise reduction comprises one or both of feedforward filtering and feedback filtering. For a specific implementation manner, reference may be made to an implementation manner in the active noise reduction circuit, which is not described herein again.
Step 1802: performing sub-band noise reduction on a second audio signal picked up from the external environment to obtain a third audio signal with steady-state noise reduced by the external environment; wherein the first audio signal and the second audio signal are picked up simultaneously.
In one possible embodiment, when the first audio signal includes a sub audio signal picked up from an external environment, the sub audio signal is down-sampled to obtain a second audio signal; and carrying out sub-band noise reduction on the second audio signal to obtain a third audio signal.
When the first audio signal comprises a sub audio signal picked up from the external environment, the multiplexing of the sub audio signal can be carried out by down-sampling the sub audio signal to obtain the second audio signal, thereby reducing the circuit overhead.
The third audio signal may also include a playing audio, and the specific implementation manner may refer to a related scheme in the active noise reduction circuit, which is not described herein again.
Step 1803: and modulating the inverted audio signal and the third audio signal to obtain a fourth audio signal subjected to noise reduction.
In the embodiment provided by the invention, the phase-reversed audio signal opposite to the phase of the environmental noise is obtained by actively reducing the noise of the picked-up first audio signal; performing sub-band noise reduction on a second audio signal picked up from the external environment to obtain a third audio signal in the external environment after a steady-state sound source is removed; modulating the inverted audio signal and the third audio signal to obtain a fourth audio signal subjected to noise reduction; wherein the first audio signal and the second audio signal are picked up simultaneously. This makes the user hear clearly the sound of the external environment after the steady state noise is reduced when listening to the fourth audio signal, so that the device adopting the method has the sound permeability.
Based on the same inventive concept, an embodiment of the present invention provides an electronic device, which includes an active noise reduction circuit with rich tone permeability.
The electronic device may be, for example, a monaural headset, a binaural headset, a telephone, a wearable device, or the like.
Based on the same inventive concept, an embodiment of the present invention further provides a readable storage medium, including:
a memory for storing a plurality of data to be transmitted,
the memory is configured to store instructions that, when executed by the processor, cause the apparatus comprising the readable storage medium to perform the method of active noise reduction with livingpermeability as described above.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. An active noise reduction circuit having a peaker permeability, comprising:
the active noise reduction unit is used for actively reducing noise of the picked-up first audio signal to obtain an inverse audio signal with a phase opposite to that of the ambient noise;
the sub-band noise reduction unit is used for sub-band noise reduction of a second audio signal picked up from the external environment to obtain a third audio signal with the steady-state noise reduced by the external environment; wherein the first audio signal and the second audio signal are picked up simultaneously;
and the signal output unit is used for modulating the inverted audio signal and the third audio signal to obtain a fourth audio signal subjected to noise reduction.
2. The active noise reduction circuit of claim 1, wherein the active noise reduction unit comprises:
a fixed active noise reduction circuit or a self-adaptive active noise reduction circuit, and a compensation filter connected between the sub-band noise reduction unit and the fixed active noise reduction circuit or the self-adaptive active noise reduction circuit;
the fixed active noise reduction circuit is the inverse audio signal obtained by actively reducing noise of the first audio signal by using fixed noise reduction parameters, and the adaptive active noise reduction circuit is the inverse audio signal obtained by actively reducing noise of the first audio signal by using adaptive coefficients; the compensation filter is used for processing the third audio signal and inputting the processed third audio signal into the fixed active noise reduction circuit or the adaptive active noise reduction circuit so as to eliminate the third audio signal in the first audio signal.
3. The active noise reduction circuit of claim 2, wherein the fixed active noise reduction circuit comprises:
a feedforward filter circuit, or the feedforward filter circuit and a feedback filter circuit; the feedforward filter circuit is used for generating an inverse audio signal with a phase opposite to that of noise in the external environment, and the feedback filter circuit is used for generating an inverse audio signal with a phase opposite to that of the noise in the ear canal environment.
4. The active noise reduction circuit of any of claims 1-3, wherein when the first audio signal comprises a sub-audio signal picked up from the ambient environment, the second audio signal is down-sampled from the sub-audio signal.
5. The active noise reduction circuit of any of claims 1-3, wherein the sub-band noise reduction unit is further configured to superimpose the received playback audio onto the sub-band noise reduced audio signal to obtain the third audio signal.
6. An active noise reduction method with litonne permeability, comprising:
actively reducing noise of the picked-up first audio signal to obtain an inverse audio signal with a phase opposite to that of the ambient noise;
performing sub-band noise reduction on a second audio signal picked up from the external environment to obtain a third audio signal with steady-state noise reduced by the external environment; wherein the first audio signal and the second audio signal are picked up simultaneously;
and modulating the reversed phase audio signal and the third audio signal to obtain a fourth audio signal subjected to noise reduction.
7. The method of claim 6, wherein actively denoising the picked-up first audio signal to obtain an inverted audio signal in phase opposition to the ambient noise, comprises:
performing signal compensation on the first audio signal by using the third audio signal to eliminate the third audio signal contained in the first audio signal, and obtaining a compensated audio signal;
carrying out fixed active noise reduction or self-adaptive active noise reduction on the compensated audio signal to obtain the inverse audio signal; wherein the fixed active noise reduction comprises one or both of feedforward filtering and feedback filtering.
8. The method of claim 6 or 7, wherein sub-band denoising a second audio signal picked up from an external environment to obtain a third audio signal with stationary noise removed from the external environment, comprises:
when the first audio signal comprises a sub audio signal picked up from the external environment, performing down sampling on the sub audio signal to obtain a second audio signal;
and carrying out sub-band noise reduction on the second audio signal to obtain the third audio signal.
9. An electronic device comprising an active noise reduction circuit with acoustic transparency according to any one of claims 1-5.
10. A readable storage medium, comprising a memory,
the memory is to store instructions that, when executed by the processor, cause an apparatus comprising the readable storage medium to perform the method of any one of claims 6-8.
CN202011267480.XA 2020-11-13 2020-11-13 Active noise reduction circuit with liyin permeability, method, equipment and storage medium Pending CN114501211A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116405823A (en) * 2023-06-01 2023-07-07 深圳市匠心原创科技有限公司 Intelligent audio denoising enhancement method for bone conduction earphone

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116405823A (en) * 2023-06-01 2023-07-07 深圳市匠心原创科技有限公司 Intelligent audio denoising enhancement method for bone conduction earphone
CN116405823B (en) * 2023-06-01 2023-08-29 深圳市匠心原创科技有限公司 Intelligent audio denoising enhancement method for bone conduction earphone

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