CN109545181A - A kind of adaptive digital active noise reduction framework - Google Patents
A kind of adaptive digital active noise reduction framework Download PDFInfo
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- CN109545181A CN109545181A CN201811525946.4A CN201811525946A CN109545181A CN 109545181 A CN109545181 A CN 109545181A CN 201811525946 A CN201811525946 A CN 201811525946A CN 109545181 A CN109545181 A CN 109545181A
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- filter
- feedforward
- noise reduction
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- sef
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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
- G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
-
- 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
-
- 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
- G10K11/17879—General system configurations using both a reference signal and an error signal
-
- 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
- G10K11/17879—General system configurations using both a reference signal and an error signal
- G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a kind of adaptive digital active noise reduction frameworks, including sequentially connected reference microphone, first analog-digital converter, first high-pass filter and feedforward sef-adapting filter, it further include sequentially connected error pick-up, second analog-digital converter and the second high-pass filter, the output end of first high-pass filter is also connected with feedforward fixed filters, the output end connection feedforward sef-adapting filter of second high-pass filter, the output end of second high-pass filter is also connected with feedback fixed filters, feedover fixed filters, feedforward sef-adapting filter and the output end signal for feeding back fixed filters carry out digital-to-analogue conversion after being superimposed and are exported by loudspeaker.The noise reduction sound wave that fixed filters generate is superimposed with noise reduction sound wave caused by sef-adapting filter, to make up simple adaptive deficiency of the framework in noise reduction effect, increase automatic amplitude control circuitry in error microphone sampling channel to solve deficiency of the fixed-point calculation in precision.
Description
Technical field
The present invention relates to noise control technique fields, are a kind of adaptive digital active noise reduction frameworks specifically.
Background technique
As the common people step up for what noise pollution correlation was realized, the demand of noise reduction is increasing, in low noise ring
In border on the one hand on the other hand life and work can keep relatively good mood to imitate to improve work with effective protection hearing
Rate.In current ambient noise, high-frequency noise can effectively be shielded by passive noise reduction, but but not for low-frequency noise effect
It is fully up to expectations, and active noise reduction can just solve the problems, such as the noise reduction of low-frequency noise very well, so active noise reduction techniques are in life at present
Application in work living gradually increases.Active noise reduction, which refers to, generates, opposite in phase consistent with noise frequency, width using electronic circuit
It spends consistent signal and forms sound wave interference, to achieve the effect that inhibit noise.Active noise reduction is broadly divided into simulation active noise reduction
With digital active noise reduction, the consistency for being overly dependent upon component due to simulating noise reduction, and can not be with peripheral environment parameter
Variation and automatic condition, digital active noise reduction can just make up this problem.So academic circles at present main direction of studying exists
In terms of adaptive digital active noise reduction.But there are noise reduction effects in part non-causality frequency range for traditional adaptive framework
The problem of poor problem and fixed-point algorithm precision deficiency.
Summary of the invention
The purpose of the present invention is to provide a kind of adaptive digital active noise reduction frameworks, traditional in the prior art for solving
Adaptive framework there is a problem of that noise reduction effect is poor in part non-causality frequency range.
The present invention is solved the above problems by following technical proposals:
A kind of adaptive digital active noise reduction framework, including reference microphone and reference microphone sequentially connected first
Analog-digital converter, the first high-pass filter and feedforward sef-adapting filter, further include error pick-up, with error pick-up successively
The second analog-digital converter and the second high-pass filter of connection, it is solid that the output end of first high-pass filter is also connected with feedforward
Determine filter, the output end of second high-pass filter connects the feedforward sef-adapting filter, the second high-pass filter
Output end is also connected with feedback fixed filters, the feedforward fixed filters, feedforward sef-adapting filter and the fixed filter of feedback
Digital-to-analogue conversion is carried out after the output end signal superposition of wave device and is exported by loudspeaker.
Since feedforward sef-adapting filter carries out noise reduction only for causality frequency range, in feedforward path and feedback
Channel increases separately the fixed filter circuit of feedforward and feedback fixed filters, and feedover fixed filter circuit and feedback fixed filters
The noise reduction sound wave of generation is superimposed with noise reduction sound wave caused by feedforward sef-adapting filter, can be carried out to non-causality frequency range
Specific aim is adjusted to reach noise reduction effect, to make up simple adaptive deficiency of the framework in noise reduction effect, improves whole noise reduction
Effect.
Further, also connect between the output end of second high-pass filter and the output end for the sef-adapting filter that feedovers
It is connected to the automatic amplitude control circuitry for signal amplitude to be amplified/reduced.
Since feedforward sef-adapting filter generallys use fixed-point algorithm, made by increasing automatic amplitude control circuitry accidentally
In the lesser situation of difference signal amplitude, still feedforward adaptive filter coefficient can be updated, thus be optimal
Effect solves deficiency of the fixed-point calculation in precision.
Further, the feedforward fixed filters use finite impulse response filter or unlimited shock filter.
Further, the feedback fixed filters use finite impulse response filter or unlimited shock filter.
Feedforward fixed filters and feedback fixed filters can be finite impulse response filter (FIR), unlimited respectively
Shock filter (IIR) or both any combination.
Compared with prior art, the present invention have the following advantages that and the utility model has the advantages that
(1) present invention increases fixed filters, the noise reduction sound wave that fixed filters generate in feedforward path and feedback channel
It is superimposed with noise reduction sound wave caused by sef-adapting filter, to make up simple adaptive deficiency of the framework in noise reduction effect,
Increase automatic amplitude control circuitry in error microphone sampling channel to solve deficiency of the fixed-point calculation in precision.
(2) automatic amplitude control circuitry major function of the invention is to carry out when signal amplitude is lesser to signal
Enhanced processing；When signal amplitude is larger, reduction processing is carried out to signal, the signal that makes that treated in this way
It is constantly in metastable amplitude.
Detailed description of the invention
Fig. 1 is structure chart of the invention；
Fig. 2 is the functional schematic of automatic amplitude control circuitry.
Specific embodiment
The present invention is described in further detail below with reference to embodiment, embodiments of the present invention are not limited thereto.
Embodiment 1:
In conjunction with shown in attached drawing 1, a kind of adaptive digital active noise reduction framework, including in feedforward path reference microphone,
It further include the error in feedback channel with the sequentially connected ADC of reference microphone, high-pass filter and feedforward sef-adapting filter
Sensor and the sequentially connected ADC of error pick-up and high-pass filter, the output end of the high-pass filter of feedforward path also connect
Feedforward fixed filters are connected to, the output end of the high-pass filter of feedback channel connects the feedforward sef-adapting filter, feedback
The output end of the high-pass filter in channel is also connected with feedback fixed filters, and the feedforward fixed filters, feedforward are adaptive
Digital-to-analogue conversion is carried out after the output end signal superposition of filter and feedback fixed filters and is exported by loudspeaker.
Since feedforward sef-adapting filter carries out noise reduction only for causality frequency range, in feedforward path and feedback
Channel increases separately the fixed filter circuit of feedforward and feedback fixed filters, feedforward fixed filters and feedback fixed filters point
It not can be finite impulse response filter (FIR), unlimited shock filter (IIR) or both any combination, feedforward is fixed
The noise reduction sound wave that filter circuit and feedback fixed filters generate is superimposed with noise reduction sound wave caused by feedforward sef-adapting filter,
Specific aim can be carried out to non-causality frequency range to adjust to reach noise reduction effect, imitated with making up simple adaptive framework in noise reduction
Deficiency on fruit improves whole noise reduction effect.
Embodiment 2:
On the basis of embodiment 1, in conjunction with shown in attached drawing 1 and Fig. 2, the output end of the high-pass filter of the feedback channel
The automatic amplitude control for signal amplitude to be amplified/reduced is also connected between the output end of feedforward sef-adapting filter
Circuit processed.
Since feedforward sef-adapting filter generallys use fixed-point algorithm, made by increasing automatic amplitude control circuitry accidentally
In the lesser situation of difference signal amplitude, still feedforward adaptive filter coefficient can be updated, thus be optimal
Effect solves deficiency of the fixed-point calculation in precision.
Although reference be made herein to invention has been described for explanatory embodiment of the invention, and above-described embodiment is only this hair
Bright preferable embodiment, embodiment of the present invention are not limited by the above embodiments, it should be appreciated that those skilled in the art
Member can be designed that a lot of other modification and implementations, these modifications and implementations will fall in principle disclosed in the present application
Within scope and spirit.
Claims (4)
1. a kind of adaptive digital active noise reduction framework, including reference microphone and sequentially connected first mould of reference microphone
Number converter, the first high-pass filter and feedforward sef-adapting filter, further include error pick-up, successively connect with error pick-up
The second analog-digital converter and the second high-pass filter connect, which is characterized in that the output end of first high-pass filter also connects
Feedforward fixed filters are connected to, the output end of second high-pass filter connects the feedforward sef-adapting filter, and second is high
The output end of bandpass filter is also connected with feedback fixed filters, the feedforward fixed filters, feedforward sef-adapting filter and
Digital-to-analogue conversion is carried out after the output end signal superposition of feedback fixed filters and is exported by loudspeaker.
2. a kind of adaptive digital active noise reduction framework according to claim 1, which is characterized in that the second high pass filter
It is also connected between the output end of wave device and the output end for the sef-adapting filter that feedovers for signal amplitude to be amplified/reduced
Automatic amplitude control circuitry.
3. a kind of adaptive digital active noise reduction framework according to claim 1, which is characterized in that the fixed filter of the feedforward
Wave device uses finite impulse response filter or unlimited shock filter.
4. a kind of adaptive digital active noise reduction framework according to claim 1 or 3, which is characterized in that the feedback is solid
Filter is determined using finite impulse response filter or unlimited shock filter.
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| CN201811525946.4A CN109545181A (en) | 2018-12-13 | 2018-12-13 | A kind of adaptive digital active noise reduction framework |
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Cited By (4)
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| CN110706686A (en) * | 2019-12-13 | 2020-01-17 | 恒玄科技(北京)有限公司 | Noise reduction method, adaptive filter, in-ear headphone and semi-in-ear headphone |
| CN111193977A (en) * | 2019-12-13 | 2020-05-22 | 恒玄科技(上海)股份有限公司 | Noise reduction method of earphone, self-adaptive FIR filter, noise removal filter bank and earphone |
| CN112562627A (en) * | 2020-11-30 | 2021-03-26 | 深圳百灵声学有限公司 | Feedforward filter design method, active noise reduction method, system and electronic equipment |
| CN112562624A (en) * | 2020-11-30 | 2021-03-26 | 深圳百灵声学有限公司 | Active noise reduction filter design method, noise reduction method, system and electronic equipment |
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