CN113299262B - Active noise reduction method and device, earphone, readable storage medium and electronic equipment - Google Patents
Active noise reduction method and device, earphone, readable storage medium and electronic equipment Download PDFInfo
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- CN113299262B CN113299262B CN202110559640.6A CN202110559640A CN113299262B CN 113299262 B CN113299262 B CN 113299262B CN 202110559640 A CN202110559640 A CN 202110559640A CN 113299262 B CN113299262 B CN 113299262B
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
- G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/01—Hearing devices using active noise cancellation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
- Headphones And Earphones (AREA)
Abstract
The application provides an active noise reduction method, an active noise reduction device, an earphone, a readable storage medium and electronic equipment. According to the application, the first noise reduction signal is determined according to the original noise signal acquired by the reference microphone and the first noise reduction parameter, and the second noise reduction signal is determined according to the residual noise signal acquired by the error microphone and the second noise reduction parameter, so that the loudspeaker is driven based on the two noise reduction signals to reduce noise in a target area of active noise reduction equipment such as a headset. The active noise reduction scheme can ensure the noise reduction width and the noise reduction depth simultaneously in a hybrid noise reduction mode, and improves the active noise reduction effect.
Description
Technical Field
The application relates to the technical field of audio signal processing, in particular to an active noise reduction method, an active noise reduction device, an earphone, a readable storage medium and electronic equipment.
Background
In the field of active noise reduction (Active Noise Cancellation, ANC), feed-forward active noise reduction schemes are most commonly used. However, in feedforward active noise reduction, the reference microphone that collects environmental noise is closer to the original noise source than the target noise reduction region, and thus the noise reduction width (the frequency range in which noise can be reduced) is large, but the noise reduction depth (the sound pressure level in which noise can be reduced) is generally low because the noise level after noise reduction cannot be reflected.
Disclosure of Invention
The application provides an active noise reduction method, an active noise reduction device, an earphone, a readable storage medium and electronic equipment, aiming at the defects of the prior art. The application adopts the following technical scheme.
First, to achieve the above object, an active noise reduction method is provided, which includes: determining a first noise reduction signal according to an original noise signal acquired by a reference microphone and a first noise reduction parameter; determining a second noise reduction signal according to the residual noise signal acquired by the error microphone and the second noise reduction parameter; and driving a loudspeaker based on the first noise reduction signal and the second noise reduction signal, and reducing noise of a target area corresponding to the error microphone.
Optionally, the active noise reduction method according to any one of the preceding claims, wherein determining the second noise reduction signal according to the residual noise signal collected by the error microphone and the second noise reduction parameter includes: determining a secondary path estimate signal based on the initial second noise reduction signal and the secondary acoustic path parameters; determining a bias signal between the residual noise signal and the secondary path estimate signal; and determining an updated second noise reduction signal according to the deviation signal and the second noise reduction parameter.
Optionally, the active noise reduction method according to any one of the preceding claims, further comprising: determining updated secondary acoustic path parameters based on the initial second noise reduction signal and the bias signal; and determining an updated secondary path estimation signal according to the updated second noise reduction signal and the updated secondary acoustic path parameter.
Optionally, the active noise reduction method according to any one of the preceding claims, wherein determining the updated secondary acoustic path parameter based on the initial second noise reduction signal and the deviation signal comprises: determining the secondary path estimation signal according to the superposition signal of the signal to be played, which has no correlation with the noise signal, the initial second noise reduction signal and the secondary acoustic path parameter; determining the bias signal based on the residual noise signal and the secondary path estimate signal; the updated secondary acoustic path parameter is determined based on the superimposed signal and the deviation signal.
Optionally, the active noise reduction method according to any one of the preceding claims, further comprising: the first noise reduction parameter is determined from the original noise signal and the secondary acoustic path parameter, and the residual noise signal.
Meanwhile, in order to achieve the above object, the present application also provides an active noise reduction device, which includes: the first determining module is used for determining a first noise reduction signal according to an original noise signal acquired by the reference microphone and a first noise reduction parameter; the second determining module is used for determining a second noise reduction signal according to the residual noise signal acquired by the error microphone and the second noise reduction parameter; and the mixed noise reduction module is used for driving a loudspeaker based on the first noise reduction signal and the second noise reduction signal and reducing noise of a target area corresponding to the error microphone.
Meanwhile, to achieve the above object, the present application also provides an active noise reduction earphone, which includes: the reference microphone is used for collecting original noise signals outside the ear of the user; the error microphone is used for collecting residual noise signals in the ears of the user; the feedforward filter is used for carrying out noise reduction filtering on the original noise signal and outputting a feedforward noise reduction signal; the feedback filter is used for carrying out noise reduction filtering on the residual noise signal and outputting a feedback noise reduction signal; and the loudspeaker is used for responding to the feedforward noise reduction signal and the feedback noise reduction signal and emitting noise reduction sound waves.
Optionally, the active noise reduction earphone according to any of the preceding claims, wherein the feedforward filter is an adaptive filter.
Meanwhile, to achieve the above object, the present application also provides a computer-readable storage medium including computer instructions stored thereon, which when executed by a processor, cause the processor to perform the active noise reduction method as set forth in any one of the above.
Meanwhile, to achieve the above object, the present application also provides an electronic device including: a processor; a memory comprising computer instructions stored thereon that, when executed by the processor, cause the processor to perform the active noise reduction method of any of the above claims.
Advantageous effects
According to the feedforward ANC scheme, the first noise reduction signal is determined according to the original noise signal acquired by the reference microphone and the first noise reduction parameter, and the second noise reduction signal is further determined according to the residual noise signal acquired by the error microphone and the second noise reduction parameter, so that the loudspeaker is driven based on the two noise reduction signals to reduce noise in a target area of active noise reduction equipment such as an earphone. The active noise reduction scheme can ensure the noise reduction width and the noise reduction depth simultaneously in a hybrid noise reduction mode, and improves the active noise reduction effect.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, and do not limit the application. In the drawings:
FIG. 1 is a schematic diagram of a basic principle framework of an active noise reduction earphone implemented according to an embodiment of the application;
FIG. 2 is a schematic diagram of a basic principle framework of an active noise reduction earphone implemented according to another embodiment of the application;
FIG. 3 is a signal processing block diagram of the active noise reduction earphone of FIG. 2;
FIG. 4 is a signal processing block diagram of an active noise reduction headset implemented in accordance with yet another embodiment of the application;
fig. 5 is a signal processing block diagram of an active noise reduction headset implemented in accordance with yet another embodiment of the application.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present application fall within the protection scope of the present application.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
"connected" as used herein means either a direct connection between components or an indirect connection between components via other components.
It should be noted that, the method of the present application is illustrated by taking the active noise reduction earphone as an execution main body, and the steps and the flow involved in the method of the present application are described through the active noise reduction earphone circuit frame, but the method is also applicable to the scenes of other active noise reduction devices except the earphone.
Fig. 1 shows a basic framework of an active noise reduction ANC headset implemented according to an embodiment of the method of the application. The earphone is provided with two microphones: reference microphone ref Mic and error microphone err Mic, a loudspeaker, and a feedforward controller (i.e. a feedforward filter corresponding to the first noise reduction parameter W ff ) And a feedback controller (i.e. a feedback filter corresponding to the second noise reduction parameter W fb ). In the figure, the original noise signal collected by ref Mic is d (n), the first noise reduction signal (i.e., feedforward noise reduction signal) is y (n), the secondary acoustic path (speaker-to-err Mic) parameter is G, the primary acoustic path (ref Mic-to-err Mic) parameter is P, the remaining noise signal after noise reduction collected by err Mic is e (n), and the second noise reduction signal (i.e., feedback noise reduction signal) is b (n).
It should be noted that the dashed block diagram (P, G) in the present application represents the real acoustic path in the earphone sound cavity space, and the dashed arrow represents the propagation of the acoustic signal in the corresponding space.
According to the active noise reduction method, noise reduction is carried out on the target area where the error microphone is located in a mode of mixing feedforward noise reduction and feedback noise reduction, and the feedforward noise reduction system processes noise which does not reach the target area in real time, so that excellent noise reduction width can be ensured; meanwhile, the feedback noise reduction system processes noise of the target area after noise reduction in real time, and the overall noise reduction depth can be remarkably improved.
In conclusion, the superposition signal of the first noise reduction signal and the second noise reduction signal drives the loudspeaker to play noise reduction sound waves, so that the noise reduction width and the noise reduction depth can be both achieved, and the active noise reduction effect on the target area is improved.
Referring to fig. 1, the residual noise signal may be described in the frequency domain by:
[e(f)·W fb (f)+y(f)]g (f) +d (f). P (f) =e (f) formula (1)
And (3) solving to obtain:
it can be seen that the residual noise signal is taken as input to the feedback controller, which is subject to the open loop transfer function W of the feedback system fb (f) The influence of G (f), if it approaches 1 in a certain frequency band, the feedback system will be unstable.
In view of this problem, the present application further provides an active noise reduction earphone frame shown in fig. 2 according to an embodiment of the method, and a corresponding signal processing procedure is shown in fig. 3 (the same or corresponding parts as fig. 1 are not repeated):an estimation unit for secondary acoustic path parameters is used for representing a real secondary acoustic path transfer function by a circuit transfer function, and is called as secondary path transfer function estimation in the figure.
Unlike the previous embodiments, when the feedback noise reduction system determines the second noise reduction signal: according to the second noise reduction signal b (n) anddetermining a secondary path estimation signal, determining a deviation signal e '(n+1) between the residual noise signal e (n+1) and the secondary path estimation signal, and based on the deviation signal e' (n+1) and the second noise reduction parameter W fb A second noise reduction signal b (n+1) is determined. At this time, the input signal of the feedback controller is no longer the residual noise signal, but (frequency domain representation):
the method of the application thus provides for the addition of an estimation unit for the secondary acoustic path parameters in the feedback noise reduction systemThe input signal of the feedback controller is free of poles, so that the stability of the feedback system in the embodiment is enhanced.
In the above scheme, the estimation of G added in the feedback systemThe earphone can be designed offline before leaving the factory, or can be obtained through self-adaptive solution in the actual use process of the earphone, as shown in fig. 4: according to the second noise reduction signals b (n) and +.>Determining a secondary path estimation signal based on the second noise reduction signal b (n) and the deviation signal e' (n)And according to the second noise reduction signals b (n+1) and +.>Updating the secondary path estimation signal; thereafter, as in the previous embodiment, a deviation signal e '(n+2) between the residual noise signal e (n+2) and the secondary path estimation signal is determined, and the second noise reduction parameter W is based on the deviation signal e' (n+2) fb A second noise reduction signal b (n+2) is determined.
Adaptive solutionIn the course of (a), the deviation signal e' (n) is used as one of the input signals of the adaptation link and the other input of the adaptation linkIn addition to the second noise reduction signal b (n), in some embodiments, the signal x (n) to be played by the earphone, which has no correlation with the noise signal, may be superimposed, for example: a media audio signal or a talk voice signal.
The application also provides an active noise reduction earphone frame as shown in fig. 5 according to a method embodiment. Unlike fig. 3, the feedforward filter in the active noise reduction earphone is set as an adaptive filter. In the adaptive link: based on the original noise signal d (n) and the above determinationObtaining one input signal of the self-adaptive link, taking the residual noise signal e (n) as the other input signal of the self-adaptive link, and iteratively updating the initial parameters of the feedforward controller through the two input signals until the energy of the residual noise signal e (n) converges to the minimum value, and determining the optimal first noise reduction parameter W at the moment ff 。
Based on the hybrid active noise reduction system provided by the embodiment of the application shown in fig. 3 and 4, the feedforward noise reduction system is realized as the adaptive feedforward noise reduction system shown in fig. 5, so that the convergence speed of the adaptive link can be increased, and the adaptive noise reduction system enters an optimal control state earlier than a general adaptive feedforward noise reduction system.
The application also provides an active noise reduction device, which comprises:
the first determining module is used for determining a first noise reduction signal according to an original noise signal acquired by the reference microphone and a first noise reduction parameter of the feedforward controller;
the second determining module is used for determining a second noise reduction signal according to the residual noise signal acquired by the error microphone and a second noise reduction parameter of the feedback controller;
the mixed noise reduction module is used for driving the loudspeaker based on the first noise reduction signal and the second noise reduction signal and reducing noise of a target area corresponding to the error microphone.
The specific step of determining the second noise reduction signal by the second determining module according to the residual noise signal collected by the error microphone and the second noise reduction parameter may be set as follows:
firstly, determining a secondary path estimation signal according to an initial second noise reduction signal and secondary acoustic path parameters;
then, determining a deviation signal between the residual noise signal and the secondary path estimation signal;
finally, an updated second noise reduction signal is determined based on the deviation signal and the second noise reduction parameter.
The active noise reduction device is applied to the earphone, so that the active noise reduction earphone provided by the embodiment of the application can be further obtained. The earphone comprises:
the reference microphone is arranged on the earphone shell and is used for collecting original noise signals outside the ears of the user;
the error microphone is arranged in the earphone shell and close to the sound outlet and is used for collecting residual noise signals in the ears of the user;
the feedforward filter corresponds to the first determining module in the active noise reduction device and is used for noise reduction and filtering of the original noise signal according to the first noise reduction parameters and outputting a feedforward noise reduction signal;
the feedback filter corresponds to the second determining module in the active noise reduction device and is used for carrying out noise reduction filtering on the residual noise signal according to the second noise reduction parameters and outputting a feedback noise reduction signal;
and the loudspeaker corresponds to the hybrid noise reduction module in the active noise reduction device and is used for responding to the feedforward noise reduction signal and the feedback noise reduction signal and sending out noise reduction sound waves.
According to the active noise reduction earphone, noise is reduced on the auditory canal of a user through a mixed framework of feedforward noise reduction and feedback noise reduction, and the feedforward filter processes environmental noise which does not enter the auditory canal yet in real time, so that excellent noise reduction width can be ensured, and the maximum can reach 3kHz (kilohertz); meanwhile, the feedback filter processes residual noise in the ear in real time, so that the overall noise reduction depth can be obviously improved, and the maximum noise reduction depth can reach 35-40 dB. In conclusion, the superimposed signal of the feedforward noise reduction signal and the feedback noise reduction signal drives the earphone speaker to play noise reduction sound waves, so that the noise reduction width and the noise reduction depth can be combined, and the active noise reduction effect on the auditory canal of the user is remarkably improved.
In another aspect, other embodiments of the present application provide a computer-readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the active noise reduction method according to any of the above embodiments. It is understood that the computer storage medium may be any tangible medium, such as: floppy disks, CD-ROMs, DVDs, hard drives, or network media.
In still another aspect, other embodiments of the present application also provide an electronic device, including: a processor; a memory comprising computer instructions stored thereon that, when executed by a processor, cause the processor to perform the active noise reduction method as provided in any of the embodiments described above.
The foregoing is a description of embodiments of the application, which are specific and detailed, but are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application.
Claims (9)
1. An active noise reduction method, comprising:
determining a first noise reduction signal according to an original noise signal acquired by a reference microphone and a first noise reduction parameter;
determining a second noise reduction signal according to the residual noise signal acquired by the error microphone and the second noise reduction parameter;
driving a loudspeaker based on the first noise reduction signal and the second noise reduction signal, and reducing noise of a target area corresponding to the error microphone;
wherein, according to the remaining noise signal and the second noise reduction parameter that error microphone gathered, confirm the second noise reduction signal, include:
determining a secondary path estimate signal based on the initial second noise reduction signal and the secondary acoustic path parameters;
determining a bias signal between the residual noise signal and the secondary path estimate signal;
and determining an updated second noise reduction signal according to the deviation signal and the second noise reduction parameter.
2. The active noise reduction method of claim 1, further comprising:
determining updated secondary acoustic path parameters based on the initial second noise reduction signal and the bias signal;
and determining an updated secondary path estimation signal according to the updated second noise reduction signal and the updated secondary acoustic path parameter.
3. The active noise reduction method of claim 2, wherein determining updated secondary acoustic path parameters based on the initial second noise reduction signal and the bias signal comprises:
determining the secondary path estimation signal according to the superposition signal of the signal to be played, which has no correlation with the noise signal, the initial second noise reduction signal and the secondary acoustic path parameter;
determining the bias signal based on the residual noise signal and the secondary path estimate signal;
the updated secondary acoustic path parameter is determined based on the superimposed signal and the deviation signal.
4. The active noise reduction method of claim 1, further comprising: the first noise reduction parameter is determined from the original noise signal and the secondary acoustic path parameter, and the residual noise signal.
5. An active noise reduction device, comprising:
the first determining module is used for determining a first noise reduction signal according to an original noise signal acquired by the reference microphone and a first noise reduction parameter;
the second determining module is used for determining a second noise reduction signal according to the residual noise signal acquired by the error microphone and the second noise reduction parameter;
the mixed noise reduction module is used for driving a loudspeaker based on the first noise reduction signal and the second noise reduction signal and reducing noise of a target area corresponding to the error microphone;
wherein the second determination module is further configured to: determining a secondary path estimate signal based on the initial second noise reduction signal and the secondary acoustic path parameters; determining a bias signal between the residual noise signal and the secondary path estimate signal; and determining an updated second noise reduction signal according to the deviation signal and the second noise reduction parameter.
6. An active noise reduction earphone, comprising:
the reference microphone is used for collecting original noise signals outside the ear of the user;
the error microphone is used for collecting residual noise signals in the ears of the user;
the feedforward filter is used for carrying out noise reduction filtering on the original noise signal and outputting a feedforward noise reduction signal;
the feedback filter is used for carrying out noise reduction filtering on the residual noise signal and outputting a feedback noise reduction signal;
the loudspeaker is used for responding to the feedforward noise reduction signal and the feedback noise reduction signal and sending out noise reduction sound waves;
wherein the feedback filter is further configured to: determining a secondary path estimation signal according to the initial feedback noise reduction signal and the secondary acoustic path parameters; determining a bias signal between the residual noise signal and the secondary path estimate signal; and carrying out noise reduction filtering on the deviation signal to determine an updated feedback noise reduction signal.
7. The active noise reduction earphone of claim 6, wherein the feedforward filter is an adaptive filter.
8. A computer-readable storage medium comprising computer instructions stored thereon, which when executed by a processor, cause the processor to perform the active noise reduction method of any of claims 1-4.
9. An electronic device, comprising:
a processor;
a memory comprising computer instructions stored thereon that, when executed by the processor, cause the processor to perform the active noise reduction method of any of claims 1-4.
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| CN114666700A (en) * | 2022-03-23 | 2022-06-24 | 国光电器股份有限公司 | Noise reduction earphone, earphone noise reduction method and storage medium |
| CN115278438B (en) * | 2022-07-27 | 2024-08-27 | 北京爱德发科技有限公司 | Noise reduction earphone, noise reduction method and device, storage medium and processor |
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