CN114501210A - Active noise reduction circuit with directional permeability, method, equipment and storage medium - Google Patents
Active noise reduction circuit with directional permeability, method, equipment and storage medium Download PDFInfo
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- CN114501210A CN114501210A CN202011267452.8A CN202011267452A CN114501210A CN 114501210 A CN114501210 A CN 114501210A CN 202011267452 A CN202011267452 A CN 202011267452A CN 114501210 A CN114501210 A CN 114501210A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/01—Hearing devices using active noise cancellation
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Abstract
The invention discloses an active noise reduction circuit, a method, equipment and a storage medium with directional permeability, which are used for solving the technical problem that an active noise reduction earphone in the prior art can only reduce environmental noise, and the active noise reduction circuit comprises: the active noise reduction unit is used for actively reducing noise of the picked first audio information to obtain an inverse audio signal with a phase opposite to that of the environmental noise; the wave beam filtering unit is used for carrying out wave beam filtering on the picked multi-channel second audio signals to obtain third audio signals in the direction of the expected sound source in the 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 information and the third audio signal to obtain a fourth audio signal subjected to noise reduction.
Description
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 directional permeability.
Background
As a common interactive device, the headset is widely applied to various electronic products, such as a mobile phone, a music playing device, and a wearable device.
Many earphones have an active noise reduction function to reduce interference of external noise to users. Active noise reduction headphones typically include a deep noise reduction mode, a pass-through noise reduction mode, and a noise reduction off mode. Wherein, the effect that penetrating noise reduction mode played is for reaching the natural sense of hearing when not taking the earphone, can hear the sound that comes from all directions this moment, no matter pronunciation or noise. Such a noise reduction mode is generally applied in an augmented reality scene, however, in the augmented reality scene, it is required to hear a specific sound in the environment while reducing the ambient noise, and the general transparent noise reduction mode does not obtain such an effect.
Therefore, how to make the active noise reduction earphone listen to specific sounds in the environment while reducing the environmental noise becomes an urgent technical problem to be solved.
Disclosure of Invention
The invention provides an active noise reduction circuit, method, equipment and storage medium with directional permeability, which are used for solving the technical problem that an active noise reduction earphone in the prior art can only reduce environmental noise.
In a first aspect, to solve the above technical problem, an embodiment of the present invention provides a technical solution of an active noise reduction circuit with directional permeability, where:
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 wave beam filtering unit is used for carrying out wave beam filtering on the picked multi-channel second audio signals to obtain third audio signals in the direction of the expected sound source in the 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 beam filtering 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:
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 in phase opposition to noise in the external environment and the feedback filter is configured to generate an inverse audio signal in phase opposition to noise in the ear canal environment.
In a possible implementation manner, one path of the second audio signal is obtained by down-sampling an audio signal collected by a feedforward filter circuit existing in the active noise reduction unit.
In a possible embodiment, the beam filtering unit is further configured to superimpose the received playing audio onto the audio signal in the direction of the desired sound source to obtain the third audio signal.
In a second aspect, an embodiment of the present invention provides an active noise reduction method with directional 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 wave beam filtering on the picked multi-channel second audio signals to obtain third audio signals in the direction of the expected sound source in the 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.
In a possible implementation manner, one of the multiple second audio signals is obtained by down-sampling the first audio signal.
In a third aspect, an embodiment of the present invention provides an electronic device, including the active noise reduction circuit with directional 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 beam filtering on the picked multi-channel second audio signals by using a beam filtering unit to obtain third audio information of the direction of the expected sound source in the environment; 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 reduce the ambient noise and hear the sound in the direction of the expected sound source in the environment.
Drawings
Fig. 1 is a schematic structural diagram of an active noise reduction circuit with directional permeability according to an embodiment of the present invention;
fig. 2 is a first schematic structural diagram of an active noise reduction unit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an active noise reduction unit according to an embodiment of the present invention;
FIG. 4 is a first schematic diagram of an implementation circuit structure of a feedforward filter circuit according to an embodiment of the present invention;
FIG. 5 is a second schematic diagram of an implementation circuit structure of a feedforward filter circuit according to an embodiment of the present invention;
fig. 6 is a first schematic diagram illustrating an achievable circuit structure of the feedback filter circuit according to the embodiment of the present invention;
fig. 7 is a schematic diagram of a second circuit structure of a feedback filter circuit according to an embodiment of the present invention;
fig. 8 is a first schematic diagram of an achievable circuit structure of the adaptive active noise reduction circuit according to the embodiment of the present invention;
fig. 9 is a schematic diagram of a second circuit structure of the adaptive active noise reduction circuit according to the embodiment of the present invention;
fig. 10 is a first schematic diagram illustrating an achievable circuit structure of a beam filtering unit according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a second circuit structure of a beam filtering unit according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a third circuit structure of a beam filtering unit according to an embodiment of the present invention;
fig. 13 is a schematic diagram of a circuit structure of a beam filtering unit according to a fourth embodiment of the present invention;
fig. 14 is a schematic diagram of an achievable circuit structure of the beam filtering unit according to the embodiment of the present invention;
fig. 15 is a sixth schematic diagram illustrating an achievable circuit structure of the beam filtering unit according to the embodiment of the present invention;
fig. 16 is a schematic diagram of an achievable circuit structure of a signal output unit according to an embodiment of the disclosure;
FIG. 17 is a first schematic diagram illustrating an implementation of an active noise reduction circuit with directional permeability according to an embodiment of the present invention;
FIG. 18 is a second schematic diagram of an achievable circuit structure of the directionally permeable active noise reduction circuit according to the present invention;
fig. 19 is a flowchart of an active noise reduction method with directional permeability according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides an active noise reduction circuit, method, equipment and storage medium with directional permeability, and aims to solve the technical problem that an active noise reduction earphone in the prior art can only reduce environmental noise.
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 directional permeability, comprising: the active noise reduction unit is used for actively reducing noise of the picked-up first audio signal to obtain reversed-phase audio information with a phase opposite to that of the environmental noise; the wave beam filtering unit is used for carrying out wave beam filtering on the picked multi-channel second audio signals to obtain third audio signals in the direction of the expected sound source in the 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 frequency 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 beam filtering on the picked multi-channel second audio signals by using a beam filtering unit to obtain third audio information of the direction of the expected sound source in the environment; 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 reduce the ambient noise and hear the sound in the direction of the expected sound source in the environment.
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. 1, a schematic structural diagram of an active noise reduction circuit with directional permeability according to an embodiment of the present invention is shown, where 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.
The beam filtering unit 20 is configured to perform beam filtering on the picked multiple paths of second audio signals to obtain a third audio signal in the direction where the desired sound source is located in the environment; wherein the first audio signal and the second audio signal are picked up simultaneously.
It should be understood that the environment may be one or both of an external environment and an ear canal environment, and is not limited herein; the desired sound source may be one sound source, two sound sources, three sound sources, or all sound sources existing in the environment, and these sound sources are usually non-stationary sound sources, such as voice, whistling sound, and the like, and are not limited in particular.
And the signal output unit 30 is configured to modulate the inverted audio signal with the third audio signal to obtain a fourth audio frequency 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 beam filtering unit 20 is used for performing beam filtering on the picked multi-channel second audio signals to obtain third audio information of the direction where the expected sound source is located in the environment; 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 reduce the ambient noise and hear the sound in the direction of the expected sound source in the environment.
Referring to fig. 2 and fig. 3, fig. 2 is a first structural schematic diagram of an active noise reduction unit according to an embodiment of the present invention, and fig. 3 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 beam filtering 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. 2, 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. 3, 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 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 filtering 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. 4 and 5, fig. 4 is a schematic diagram of an achievable circuit structure of a feedforward filter circuit according to an embodiment of the present invention, and fig. 5 is a schematic diagram of a achievable circuit structure of a feedforward filter circuit according to an embodiment of the present invention.
In fig. 4, 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.
Please refer to fig. 5, the feedforward filter circuit 101a may further include a first sampling circuit for sampling the sound in the external environment to obtain the 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. 6 and 7, fig. 6 is a schematic diagram of an achievable circuit structure of the feedback filter circuit according to the embodiment of the present invention, and fig. 7 is a schematic diagram of an achievable circuit structure of the feedback filter circuit according to the embodiment of the present invention.
In fig. 6, 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. 7, 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. 4 and 5, and fig. 6 and 7.
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. 8, a schematic diagram of a first circuit structure of an adaptive active noise reduction circuit provided by 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 by 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. 9, which is a schematic diagram of a second circuit structure of the adaptive active noise reduction circuit according to the embodiment of the present invention, 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 the third adder (S3), and an output end of the first sampling circuit is connected to the fourth adder (S4), so that the adaptive active noise reduction circuit 102 may directly collect the first audio signal from the environment and perform adaptive active filtering, thereby achieving the purpose of adaptive active noise reduction.
Referring to fig. 10, which is a schematic diagram of a first achievable circuit structure of the beam filtering unit according to the embodiment of the present invention, the beam filtering unit 20 includes a beam filter capable of receiving multiple second audio signals and a first up-sampling circuit (up-sampling 1) connected to the beam filter, where the beam filter is configured to obtain an audio signal in a direction where a desired sound source is located from the multiple second audio signals, and the audio signal is subjected to a sampling rate increase by the first up-sampling circuit to obtain a third audio signal.
Referring to fig. 11, a schematic diagram of a second achievable circuit structure of the beam filtering unit according to the embodiment of the present invention is shown, where the beam filtering unit 20 further includes a fifth adder (S5) connected between the beam filter and the first up-sampling circuit (up-sampling 1), and one input end of the fifth adder (S5) may be used for receiving the playing audio signal, so that the fifth adder (S5) may superimpose the audio signal in the direction of the desired sound source and the playing audio, so that the user can hear the sound in the direction of the desired sound source in the external environment while hearing the playing audio.
Referring to fig. 12, a third schematic diagram of an achievable circuit structure of the beam filtering unit according to the embodiment of the present invention, the beam filtering unit 20 may further include a third sampling circuit corresponding to the multiple second audio signals one to one, and configured to collect sounds in an external environment to form a second audio signal, perform beam filtering on the second audio signal by using a beam filter, and perform up-sampling on the second audio signal after the beam filtering by using a first up-sampling circuit (up-sampling 1) to obtain a third audio signal.
Since the delay requirement of the beam filter in the beam filtering unit is low, which is usually within 50ms, the lower the delay requirement is, the better the delay requirement is, the third analog-to-digital conversion circuit may be a common analog-to-digital converter.
In a possible implementation manner, one path of the second audio signal is obtained by down-sampling the audio signal collected by the feedforward filter circuit 101a existing in the active noise reduction unit 10. At this time, one path of the second audio signal of the beam filtering unit is obtained by down-sampling the first audio signal.
Referring to fig. 13 to 15, fig. 13 is a fourth schematic diagram illustrating an implementable circuit structure of the beam filtering unit according to the embodiment of the present invention, fig. 14 is a fifth schematic diagram illustrating an implementable circuit structure of the beam filtering unit according to the embodiment of the present invention, and fig. 15 is a sixth schematic diagram illustrating an implementable circuit structure of the beam filtering unit according to the embodiment of the present invention.
As shown in fig. 13 and 14, when the feedforward filter circuit 101a includes the first sampling circuit, or as shown in fig. 15, when the adaptive filter circuit 102 includes the first sampling circuit, the first sampling circuit and the down-sampling circuit (down-sampling) are connected together to form a third sampling circuit of the beam filter unit, so that the utilization rate of the audio signal can be improved, and the sampling circuit can be saved.
It should be noted that the beam filtering units in fig. 12 to 15 may further include an adder, and the setting manner of the adder is the same as that in fig. 11, and is not described herein again.
Referring to fig. 16, 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, which are connected in sequence. The sixth adder (S6) is configured to add the inverted audio signal output by the active noise reduction unit 10 and the third audio signal output by the beam filtering unit 20 together, and send the resulting sum to the up-sampling unit 2 to obtain a signal with a sampling rate suitable for the analog-to-digital conversion circuit, and 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 in a direction where a desired sound source is located in the environment.
If the third audio signal only comprises the audio signal in the direction of the expected sound source in the environment, the user can hear the sound in the direction of the expected sound source in the environment; if the third audio signal further includes a playing audio, the user can hear the sound in the direction of the desired sound source in the 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. 17-18.
Fig. 17 is a schematic diagram of a first circuit structure that can be implemented by the active noise reduction circuit with directional permeability according to the embodiment of the present invention, and fig. 18 is a schematic diagram of a second circuit structure that can be implemented by the active noise reduction circuit with directional permeability according to the embodiment of the present invention.
Assuming that the active noise reduction unit 10 includes the fixed active noise reduction circuit 101 composed of the feedforward filter circuit 101a and the feedback filter circuit 101b, the active noise reduction circuit composed of the active noise reduction unit 10, the beam filter unit 20, and the signal output unit 30 is as shown in fig. 17.
Assuming that the active noise reduction unit 10 includes the adaptive active noise reduction circuit 102, the active noise reduction circuit composed of the adaptive active noise reduction circuit 102, the beam filtering unit 20, and the signal output unit 30 is shown in fig. 18.
Fig. 17-18 are schematic diagrams of active noise reduction circuits in a monaural device (e.g., a phone, 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. 17 or fig. 18 may be used.
One binaural device has two chambers, which may be called as a left ear chamber and a right ear chamber, and may also combine the beam filters corresponding to the left ear chamber and the right ear chamber together to form a better directional filtering effect, and may be combined according to the hardware support condition of the headset in specific implementation. If all the microphones corresponding to the beam filters in the left ear cavity and the right ear cavity are connected to the same main control chip, the beam filtering combining the left ear cavity and the right ear cavity is only needed to be realized on the main control chip; if the microphones corresponding to the two beam filters in the left ear cavity and the right ear cavity are respectively connected to different main control chips, the combined beam filtering can be performed after the data collected by the microphones corresponding to the beam filters in the two cavities are synchronized through low-delay wireless communication.
Based on the same inventive concept, an embodiment of the present invention provides an active noise reduction method with directional permeability, please refer to fig. 19, which includes:
step 1901: 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 includes 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 1902: performing wave beam filtering on the picked multi-channel second audio signals to obtain third audio signals in the direction of the expected sound source in the environment; wherein the first audio signal and the second audio signal are picked up simultaneously.
It is desirable that the sound source comprises at least one sound source in the external environment.
And when the audio signals of a plurality of sound sources need to be obtained, the audio signals of the corresponding sound sources can be obtained by modifying the relevant parameters of the beam filter.
In a possible implementation manner, one path of the second audio signal is obtained by down-sampling the first audio signal. Namely, the first audio signal can be multiplexed into the second audio signal after being subjected to down sampling, so that the utilization rate of the signal can be improved, and the corresponding circuit design can be reduced.
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 1903: 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 wave beam filtering on the picked multi-channel second audio signals to obtain third audio signals in the direction of the expected sound source in the environment; 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 allows the user to clearly hear the sound in the direction of the desired sound source in the environment while listening to the fourth audio signal, making the device using this method directionally transparent.
Based on the same inventive concept, embodiments of the present invention provide an electronic device including an active noise reduction circuit with directional 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 directionally permeable active noise reduction method 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 with directional 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 wave beam filtering unit is used for carrying out wave beam filtering on the picked multi-channel second audio signals to obtain third audio signals in the direction of the expected sound source in the 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 beam filtering 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:
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 in phase opposition to noise in the external environment and the feedback filter is configured to generate an inverse audio signal in phase opposition to noise in the ear canal environment.
4. The active noise reduction circuit of claim 3, wherein one of the second audio signals is obtained by down-sampling an audio signal collected by a feedforward filter circuit present in the active noise reduction unit.
5. The active noise reduction circuit of any of claims 1-4, wherein the beam filtering unit is further configured to superimpose the received playback audio onto the audio signal in the direction of the desired sound source to obtain the third audio signal.
6. An active noise reduction method with directional 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 wave beam filtering on the picked multi-channel second audio signals to obtain third audio signals in the direction of the expected sound source in the 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 7, wherein one of the second audio signals is down-sampled from the first audio signal.
9. An electronic device comprising an active noise reduction circuit with directional permeability 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.
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| CN202011267452.8A CN114501210A (en) | 2020-11-13 | 2020-11-13 | Active noise reduction circuit with directional permeability, method, equipment and storage medium |
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| CN202011267452.8A CN114501210A (en) | 2020-11-13 | 2020-11-13 | Active noise reduction circuit with directional permeability, method, equipment and storage medium |
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