CN107393545A - A kind of reaction type active noise reduction system and method with flexible gain - Google Patents
A kind of reaction type active noise reduction system and method with flexible gain Download PDFInfo
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- CN107393545A CN107393545A CN201710580540.5A CN201710580540A CN107393545A CN 107393545 A CN107393545 A CN 107393545A CN 201710580540 A CN201710580540 A CN 201710580540A CN 107393545 A CN107393545 A CN 107393545A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L21/0232—Processing in the frequency domain
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
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Abstract
The present invention, which provides a kind of reaction type active noise reduction system and method, noise reduction system with flexible gain, to be included：Microphone, loudspeaker and feedback filtering unit.The acoustical signal of certain opening position is converted into electric signal by transducer, the electric signal input feedback filter unit simultaneously exports de-noising signal after processing, de-noising signal is converted into de-noising sound wave by microphone, and de-noising sound wave is superimposed with noise produces destructive interference, reaches noise reduction.Simultaneously by monitoring the output amplitude of feedback filtering circuit, on-line tuning feedback filter gain, ensure the stability of noise reduction system, lift the robustness of noise reduction system.
Description
Technical field
The present invention relates to a kind of active noise reduction techniques field, more particularly to a kind of reaction type with flexible gain actively to drop
Make an uproar system and method.
Background technology
Active noise reduction techniques are also known as active noise reduction technology, be by sound-producing device produce it is identical with outside noise amplitude,
The sound wave of opposite in phase, noise is neutralized, so as to realize the effect of noise reduction.According to the difference of topological structure, active noise reduction uses
Method be divided into two kinds of feed forward type and reaction type.Feed forward type is not deposited using feed forward control method design noise filter, this method
In system instability, but noise reduction depth is small, noise reduction unobvious.And reaction type then utilizes feedback design drop
Make an uproar wave filter, noise reduction depth is big, and noise reduction is obvious, but the problem of stability of a system be present.
Different noise circumstances, its noise frequency domain characteristic is different, therefore using its noise reduction of the feedback filter of preset parameter
Performance can not ensure, furthermore, the wearing custom of noise cancelling headphone user can cause the difference in noise reduction system acoustic characteristic, this
Difference can further deteriorate noise reduction, cause reponse system there is toning or unstable situation and uttering long and high-pitched sounds for triggering.This feelings
Do not simply fail to eliminate noise under condition, can also strengthen noise.
The content of the invention
To ensure noise reduction, improve the stability of feedback noise reduction system, the present invention proposes a kind of with flexible gain
Feedback filter, and in particular to a kind of reaction type active noise reduction system and method with flexible gain.
To achieve the above object, the present invention proposes a kind of reaction type active noise reduction system with flexible gain, the master
Dynamic noise reduction system includes：Microphone, loudspeaker and feedback filtering unit.The feedback filtering unit includes analog/digital conversion electricity
Road, feedback filtering circuit, variable-gain module and D/A switch circuit.
Output to feedback filtering unit, feedback is filtered after the noise acoustical signal detected is converted into electric signal by the microphone
The analog/digital conversion circuit of ripple unit receives the electric signal and exported after converting thereof into data signal to feedback filtering circuit,
Noise cancellation signal to D/A switch circuit, D/A converting circuit is exported after feedback filtering processing of circuit to change into noise cancellation signal
Transmitted after analog signal to microphone, loudspeaker and convert the signal into acoustical signal, the noise reduction sound wave is folded with ambient noise sound wave
Add generation destructive interference, reach noise reduction.The output of feedback filtering circuit is transmitted to variable-gain module, through variable-gain simultaneously
Output gain value after module calculates, the yield value is exported to feedback filtering circuit, for correcting present filter gain.
Further, the filter parameter of feedback filtering circuit uses offline design method.
Further, feedback filter gain is adjusted online according to the output valve of filter circuit.
Further, the output of variable-gain module and the output journey functional relation of feedback noise reduction wave filter.
The present invention also proposes a kind of reaction type active denoising method with flexible gain, and methods described includes following step
Suddenly：
Step (1) utilizes microphone measurement noise signal, Analyze noise frequency characteristic；
Step (2) is based on noise frequency characteristic, offline design feedback filter；
Step (3) utilizes feedback filter online elimination noise obtained by step (2)；
Step (4) is ensured anti-using the output valve on-line amending feedback filter gain of detection feedback filtering circuit in real time
Feedback filter circuit output is no more than threshold set in advance.
Compared with prior art, advantage of the invention is that：For different noise circumstances, fed back and filtered by on-line tuning
The gain of ripple device, the output of feedback filter is controlled, be effectively guaranteed the stability of noise reduction system, improve the robust of system
Property.Because Gain tuning demand is depending on whether the output of feedback filtering circuit exceedes default threshold, no more than fault
Feedback filter gain is kept constant in the case of value, is on the one hand reduced online amount of calculation, implementation is become simple；The opposing party
Face is by due in the near less scope of influence of the adjustment of gain to system anti-acoustic capability.
Brief description of the drawings
Fig. 1 is the reaction type active noise reduction system pie graph with flexible gain；
Fig. 2 is feedback filter design principle figure；
Fig. 3 is feedback filter gain and feedback filter output function graph of a relation.
Embodiment
It is further to the present invention with reference to the accompanying drawings and examples to further understand technical scheme and feature
Explanation.
A kind of reaction type active noise reduction system based on variable-gain is provided in the present embodiment.Refering to accompanying drawing 1, the system includes
Transducer, microphone, feedback filtering unit.The feedback control unit includes analog/digital conversion circuit, feedback filtering circuit, become
Gain module and D/A switch circuit.
Determine that transducer is microphone in embodiment.
Microphone is exported to feedback filtering unit, feedback filtering list after the noise acoustical signal detected is converted into electric signal
The analog/digital conversion circuit of member receives the electric signal of noise, and is exported after converting thereof into data signal to feedback filtering circuit, warp
De-noising signal is exported after feedback filtering processing of circuit, the de-noising signal transports to D/A switch circuit, is changed through D/A converting circuit
The simulation noise reduction electric signal is converted into acoustical signal by output to loudspeaker, loudspeaker after into analog signal, the noise reduction sound wave and ring
Border noise sound wave interaction, reaches noise reduction.The output signal of feedback filtering circuit is transmitted to variable-gain module simultaneously,
The output gain adjustment signal after the calculating of variable-gain module, the signal output is to feedback filtering circuit, for correcting current feedback
Filter gain.The noise not being eliminated is detected that said process circulation occurs by microphone again, until noise minimizes.
Feedback filter needs to be based on noise frequency characteristic offline design.Noise reduction system principle is designed using feedback filter
Refering to Fig. 2, wherein K represents feedback filter gain, and H represents feedback filter transmission function, and G represents that the transaudient characteristic of loudspeaker passes
Delivery function.To ensure that noise reduction is optimal, demand obtains K and H meets formulaI.e.：MakeTwo norms
It is minimum.
Because the feedback filter of preset parameter is different to the de-noising effect of different noise circumstances, to prevent in cancellation process
Middle feedback filter occur uttering long and high-pitched sounds caused by toning or noise reduction system it is unstable, using variable-gain unit, based on feedback filtering
Device output valve enters Mobile state adjustment to filter gain.Refering to Fig. 3, given threshold y0 is exported to feedback filter, if output valve
In the threshold range, then keep present filter gain k0 constant；If output valve exceedes the threshold value, exported according to wave filter
On-line tuning filter gain, more beyond threshold, gain is dropped smaller, by repeatedly adjusting filter gain value until feedback
Filter output value is no more than threshold.Feedback filter beyond threshold part and gain be monotonic decreasing relation, Ke Yishi
Linear monotonic as shown in Figure 3 declines or Nonlinear Monotone declines, the visual actual conditions of functional relation of the part and
It is fixed.
The present invention also proposes a kind of active denoising method with flexible gain feedback wave filter, and the present embodiment performs following
Step：
Step (1) utilizes microphone measurement noise signal, Analyze noise frequency characteristic：The noise that microphone is collected is believed
After number making Fourier transformation, distribution curve of the noise signal in each frequency range is obtained；
Step (2) is based on noise frequency characteristic, offline design feedback filter：It is special based on the noise frequency domain in step (1)
Linearity curve and the transaudient characteristic of loudspeaker, adjust feedback filter, and ensure the stabilization of noise reduction system.
Step (3) utilizes feedback filter online elimination noise obtained by step (2)：Utilize the feedback filter of offline design
Online elimination noise, and filter output signal is monitored in real time.
Step (4) is ensured anti-using the output valve on-line amending feedback filter gain of detection feedback filtering circuit in real time
Feedback wave circuit output is no more than threshold set in advance.If wave filter output exceedes threshold, reduce filter gain；If filtering
Device is exported in the range of threshold, then keeps filter gain constant.
A kind of active noise reduction system with flexible gain feedback wave filter for being there is provided above the embodiment of the present invention and
Method is described in detail, and the explanation of embodiment simply understands the core concept of the present invention for help.For the one of this area
As technical staff, according to the thought of the present invention, in specific embodiments and applications there will be changes.To sum up institute
State, this specification content should not be construed as limiting the invention.
Claims (6)
- A kind of 1. reaction type active noise reduction system with flexible gain, it is characterised in that：The active noise reduction system includes：Pass Sound device, loudspeaker and feedback filtering unit, the feedback filtering unit include analog/digital conversion circuit, feedback filtering circuit, become Gain module and D/A switch circuit；The acoustical signal detected is converted into exporting to feedback filtering unit after electric signal by the microphone, feedback filtering unit Output is filtered to feedback filtering circuit through feedback after analog/digital conversion circuit receives the electric signal and converts thereof into data signal Noise cancellation signal is changed into analog signal by output noise cancellation signal to D/A switch circuit, D/A converting circuit after wave circuit processing After transmit to microphone, loudspeaker and convert the signal into acoustical signal, the noise reduction sound wave is superimposed with ambient noise sound wave produces phase Disappear interference, reaches noise reduction；The output of feedback filtering circuit is transmitted to variable-gain module simultaneously, calculated through variable-gain module Output gain value afterwards, the yield value is exported to feedback filtering circuit, for correcting present filter gain.
- 2. the reaction type active noise reduction system according to claim 1 with flexible gain, it is characterised in that：Feedback filtering The filter parameter of circuit uses offline design method.
- 3. the reaction type active noise reduction system according to claim 1 with flexible gain, it is characterised in that：Feedback filtering Device gain is adjusted online according to the output valve of filter circuit.
- 4. the reaction type active noise reduction system according to claim 3 with flexible gain, it is characterised in that：Variable-gain mould The output of block and the output journey functional relation of feedback noise reduction unit.
- 5. the reaction type active noise reduction system according to claim 3 with flexible gain, it is characterised in that：Feedback is set Noise reduction unit exports threshold, and output exceedes the threshold, variable-gain module regulation feedback filter gain, until feedback noise reduction unit Output is no more than threshold.
- 6. a kind of reaction type active denoising method with flexible gain, this method has flexibility using described in claim 1 The reaction type active noise reduction system of gain, it is characterised in that comprise the following steps：Step (1) utilizes microphone measurement noise signal, Analyze noise frequency characteristic；Step (2) is based on noise frequency characteristic, offline design feedback filter；Step (3) utilizes feedback filter online elimination noise obtained by step (2)；Step (4) ensures feedback filter using the output valve on-line amending feedback filter gain of detection feedback filtering circuit in real time Wave circuit output is no more than threshold set in advance.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107750027A (en) * | 2017-11-30 | 2018-03-02 | 会听声学科技（北京）有限公司 | scene adaptive active noise reduction earphone and scene adaptive active noise reduction design method |
| CN107945784A (en) * | 2017-12-14 | 2018-04-20 | 成都必盛科技有限公司 | A kind of automatic calibrating method and device of active noise reduction audio frequency apparatus |
| CN108260069A (en) * | 2018-01-23 | 2018-07-06 | 歌尔股份有限公司 | The debugging system and method for a kind of noise cancelling headphone |
| CN108847209A (en) * | 2018-06-01 | 2018-11-20 | 会听声学科技（北京）有限公司 | A kind of denoising device and noise-reduction method |
| CN110225429A (en) * | 2019-06-12 | 2019-09-10 | 会听声学科技（北京）有限公司 | Active denoising method, device and earphone |
| CN111447523A (en) * | 2020-03-31 | 2020-07-24 | 歌尔科技有限公司 | Earphone, noise reduction method thereof and computer readable storage medium |
| CN112218206A (en) * | 2020-09-28 | 2021-01-12 | 业泓科技(成都)有限公司 | Sound control method, device, equipment and medium based on film loudspeaker |
| CN113676803A (en) * | 2020-05-14 | 2021-11-19 | 华为技术有限公司 | Active noise reduction method and device |
| CN114694673A (en) * | 2020-12-28 | 2022-07-01 | 深圳市韶音科技有限公司 | Method and system for audio noise reduction |
| US12262184B2 (en) | 2020-05-14 | 2025-03-25 | Huawei Technologies Co., Ltd. | Active noise cancellation method and apparatus |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107750027A (en) * | 2017-11-30 | 2018-03-02 | 会听声学科技（北京）有限公司 | scene adaptive active noise reduction earphone and scene adaptive active noise reduction design method |
| CN107945784A (en) * | 2017-12-14 | 2018-04-20 | 成都必盛科技有限公司 | A kind of automatic calibrating method and device of active noise reduction audio frequency apparatus |
| CN108260069A (en) * | 2018-01-23 | 2018-07-06 | 歌尔股份有限公司 | The debugging system and method for a kind of noise cancelling headphone |
| CN108847209A (en) * | 2018-06-01 | 2018-11-20 | 会听声学科技（北京）有限公司 | A kind of denoising device and noise-reduction method |
| CN110225429A (en) * | 2019-06-12 | 2019-09-10 | 会听声学科技（北京）有限公司 | Active denoising method, device and earphone |
| CN111447523A (en) * | 2020-03-31 | 2020-07-24 | 歌尔科技有限公司 | Earphone, noise reduction method thereof and computer readable storage medium |
| CN111447523B (en) * | 2020-03-31 | 2022-02-18 | 歌尔科技有限公司 | Earphone, noise reduction method thereof and computer readable storage medium |
| CN113676803B (en) * | 2020-05-14 | 2023-03-10 | 华为技术有限公司 | Active noise reduction method and device |
| CN113676803A (en) * | 2020-05-14 | 2021-11-19 | 华为技术有限公司 | Active noise reduction method and device |
| US12262184B2 (en) | 2020-05-14 | 2025-03-25 | Huawei Technologies Co., Ltd. | Active noise cancellation method and apparatus |
| CN112218206A (en) * | 2020-09-28 | 2021-01-12 | 业泓科技(成都)有限公司 | Sound control method, device, equipment and medium based on film loudspeaker |
| CN112218206B (en) * | 2020-09-28 | 2022-07-19 | 业泓科技(成都)有限公司 | Sound control method, device, equipment and medium based on film loudspeaker |
| CN114694673A (en) * | 2020-12-28 | 2022-07-01 | 深圳市韶音科技有限公司 | Method and system for audio noise reduction |
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