CN108428444A - A kind of compact active sound-absorption method of compensation secondary sound source Near-field Influence - Google Patents

A kind of compact active sound-absorption method of compensation secondary sound source Near-field Influence Download PDF

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Publication number
CN108428444A
CN108428444A CN201810185813.0A CN201810185813A CN108428444A CN 108428444 A CN108428444 A CN 108428444A CN 201810185813 A CN201810185813 A CN 201810185813A CN 108428444 A CN108428444 A CN 108428444A
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signal
microphone
noise
sound source
secondary sound
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CN108428444B (en
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王军
卢晶
邱小军
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Nanjing University
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Nanjing University
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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
    • 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
    • G10K11/1781—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3216—Cancellation means disposed in the vicinity of the source
    • 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
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3226—Sensor details, e.g. for producing a reference or 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/50—Miscellaneous
    • G10K2210/504—Calibration

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

Abstract

The invention discloses a kind of compact active sound-absorption methods of compensation secondary sound source Near-field Influence, include the following steps：(1) interim to place calibration microphone B in the noise reduction region of the error microphone A of compact active sound-absorption system；(2) calibration process：There was only secondary sound source sounding first, calculates the signal p of the signal s to microphone A of secondary sound source soundingAImpulse response wsAAnd the signal p of signal s to microphone BBImpulse response wsB；Then there was only noise source sounding, calculate signal pATo signal pBImpulse response wAB；(3) process is controlled：Noise source and secondary sound source sounding simultaneously, the acoustic pressure p at microphone BBPass through the signal p of secondary sound source signal s and microphone AAIt calculates and obtains.The method of the present invention effectively can carry out noise reduction under special screne to noise reduction region, and being particularly suitable for noise reduction region not allows to lay microphone for a long time, or has the scene of strict demand to active guidance system size.

Description

A kind of compact active sound-absorption method of compensation secondary sound source Near-field Influence
Technical field
The present invention relates to a kind of compact active sound-absorption methods of compensation secondary sound source Near-field Influence.
Background technology
Active control technology is widely used on noise elimination noise reduction, to general FxLMS (filtered-x least Mean square) algorithm principles and methods and performance evaluation research it is very much.
In the compact active guidance system of pipeline, if secondary sound source range error microphone is close, error microphone The Near-field Influence for the secondary sound source that place is subject to is very big, the sound field at error microphone and the sound field of control area is needed to have very big difference It is different.Document (P.M.Morse and K.U.Ingard, Chap.9, p.492-498in Theoretical acoustics, Princeton university press, New Jersey, (1968)) it demonstrates in the duct, the zero order mode that sound source is sent out The sound wave of state is unattenuated with propagation distance, and the sound wave of other mode is with propagation distance that its attenuation coefficient is different.In room Between or other complex scenes under, the sound-filed simulation difference bigger at different location.
Source control technology be common are by controlling the acoustic pressure at error microphone, can only achieve error microphone area nearby The noise reduction in domain, thus error microphone needed during entire control always cloth be placed on noise reduction region.If noise reduction region is not When can lay microphone for a long time or have strict demand to the size of active guidance system, due to different zones sound-filed simulation not Together, noise reduction noise region can not be represented to reduce the acoustic pressure at error microphone position by existing active control method It reduces.
Invention content
For the above defect existing in the prior art, the present invention provides a kind of the compact of compensation secondary sound source Near-field Influence Active sound-absorption method effectively can carry out noise reduction under special screne to noise reduction region, and being particularly suitable for noise reduction region does not allow It deploys troops on garrison duty microphone for a long time, or has the scene of strict demand to active guidance system size.
The technical solution adopted by the present invention is：
A kind of compact active sound-absorption method of compensation secondary sound source Near-field Influence, includes the following steps：
(1) interim to place calibration microphone B in the noise reduction region of the error microphone A of compact active sound-absorption system；
(2) calibration process：
First, only secondary sound source sounding, the signal p that real-time recording error microphone A is obtainedA, calibration microphone B obtains Signal pBWith the signal s of secondary sound source sounding, and signal s is calculated to signal pAImpulse response wsAWith signal s to signal pB Impulse response wsB；
Then, only noise source sounding, real-time tracer signal pAWith signal pB, and calculate signal pATo signal pBPulse Respond wAB；
(3) process is controlled：
Noise source and secondary sound source while sounding, first, according to signal s and impulse response wsACalculate secondary sound source sounding The acoustic pressure p that error microphone A is influenceds A, then at error microphone A only and the related signal p of noise sourcenoise AFor pA-ps A；
Then, according to signal pnoise AWith impulse response wABThe places calibration microphone B and the related letter of noise source can be calculated Number pnoise B；According to signal s and impulse response wsBCalculate the acoustic pressure p that secondary sound source sounding influences calibration microphone Bs B, then drop Make an uproar the acoustic pressure p in regionB=pnoise B+ps B；
Finally, with acoustic pressure pBError signal as FxLMS Active noise controls controls the acoustic pressure in noise reduction region.
The method of the present invention obtains dependent correction filter, these schools using additional calibration microphone in a calibration process Quasi- filter can compensate sound source Near-field Influence during control.It can pass through compact active guidance system meter using the present invention It calculates the acoustic pressure in noise reduction region and controls it, the original scene for not influencing noise reduction region is laid；And calibrate microphone only It uses in a calibration process, active guidance system can be kept still compact.By the present invention method calibration after, compact systems with Noise reduction region can not be spatially overlapped, and what both sides did not influenced other side region lays setting, but still can effectively reduce It makes an uproar the acoustic pressure in region.
Description of the drawings
Fig. 1 is the system structure diagram for realizing the method for the present invention, and 1- error microphones A, 2- calibrate microphone B, 3 references Microphone, 4 secondary sound sources, 5 noise sources, 6 compact active guidance systems, 7 noise reduction regions, 8 pipelines.
Fig. 2 is the flow chart for calculating impulse response in the embodiment of the present invention using LMS adaptive algorithms.
Fig. 3 is the flow chart of the FxLMS adaptive algorithms in Technique of Active Noise Control of the embodiment of the present invention.
Specific implementation mode
1, calibration process
Only 4 sounding of secondary sound source when, record the signal p of secondary sound source signal s, microphone A in real timeAWith microphone B's Signal pB, signal s to p can be calculated by LMS (Least Mean Square) adaptive algorithms or other methodsAPulse Respond { wSA(n), n=0,1 ..., LSA- 1 }, signal s to pBImpulse response { wSB(n), n=0,1 ..., LSB-1}.Wherein, LSA And LSBRespectively { wSAAnd { w (n) }SB(n) } filter length.
Below with { wSA(n) } for calculating, the process that LMS adaptive algorithms calculate impulse response is introduced, such as Fig. 2 institutes Show.Wherein e is the error signal of LMS adaptive algorithms.N-th moment filter exports：
Then the error at the n-th moment is
E (n)=d (n)-y (n) (2)
Define vector
wSA=[wSA(0),wSA(1) ..., wSA(LSA-1)] (3)
S (n)=[s (n), s (n-1) ..., s (n-LSA+1)] (4)
Then the iterative formula of filter is
wSA(n)=wSA(n-1)+μe(n)s(n) (5)
Wherein, μ is convergence step-length.With the progress of adaptive iteration, e (n) reaches minimum, then { wSA(n) } it calculates and completes.
Only 5 sounding of noise source when, record the signal p of microphone A in real timeAWith the signal p of microphone BB, adaptive by LMS Answer algorithm or other methods that can calculate signal pATo signal pBImpulse response { wAB(n), n=0,1 ..., LAB- 1 }, In, LABFor { wAB(n) } filter length.
2, the control process of Active noise control
In the control process of Active noise control, noise source 5 and secondary sound source 4 sounding simultaneously, the signal p at microphone BB The signal p of secondary sound source signal s and microphone A can be passed throughAIt calculates and obtains.
ps AFor the acoustic pressure that 4 sounding of secondary sound source influences microphone A, pnoise AIt is that at microphone A and noise source are related Signal, pnoise BFor at microphone B and 5 related signal of noise source.ps BThe sound that microphone B is influenced for 4 sounding of secondary sound source Pressure.pBFor need noise reduction noise reduction region 7 acoustic pressure.With acoustic pressure pBError signal as FxLMS Active noise controls can be right The acoustic pressure in noise reduction region 7 is controlled.
Below in case of Fig. 1, FxLMS Technique of Active Noise Control is described as follows.
FxLMS divides for secondary path modeling process and controls process, as shown in Figure 3.There was only secondary in FxLMS modeling process 4 sounding of sound source records the signal s and p of secondary sound source 4 in real timeB, s to p is calculated according to LMS adaptive algorithmsBImpulse response {wSB(n) }, this part has been completed in a calibration process.
Process, noise source 5 and secondary sound source 4 while sounding are controlled in FxLMS.Assuming that the ginseng received with reference to microphone 3 It is x to examine signalrefer, definition control filter coefficient is { w (n), n=0,1 ..., L-1 }, reference input vector
xrefer=[xrefer(n),xrefer(n-1),…,xrefer(n-L+1)] (11)
Wherein, L filter lengths in order to control.Secondary sound source signal s exports for filter, is
By reference signal xreferPass through secondary path model { wSB(n) } filtering-x (filter-x) signal, is obtained, is
Define vector
R (n)=[rrefer(n),rrefer(n-1),…,rrefer(n-L+1)] (14)
Then the iterative formula of filter is
W (n)=w (n-1)+μ e (n) r (n) (15)
Wherein, μ is convergence step-length.With the progress of adaptive iteration, e (n) reaches minimum, then { w (n) }, which is calculated, completes. In fact, e (n) is the signal that microphone B is measured, represent noise reduction region acoustic pressure have dropped down to it is minimum.

Claims (1)

1. a kind of compact active sound-absorption method of compensation secondary sound source Near-field Influence, which is characterized in that include the following steps：
(1) interim to place calibration microphone B in the noise reduction region of the error microphone A of compact active sound-absorption system；
(2) calibration process：
First, only secondary sound source sounding, the signal p that real-time recording error microphone A is obtainedA, the letters that obtain of calibration microphone B Number pBWith the signal s of secondary sound source sounding, and signal s is calculated to signal pAImpulse response wsAWith signal s to signal pBArteries and veins Punching response wsB；
Then, only noise source sounding, real-time tracer signal pAWith signal pB, and calculate signal pATo signal pBImpulse response wAB；
(3) process is controlled：
Noise source and secondary sound source while sounding, first, according to signal s and impulse response wsASecondary sound source sounding is calculated to error The acoustic pressure p that microphone A influencess A, then at error microphone A only and the related signal p of noise sourcenoise AFor pA-ps A；
Then, according to signal pnoise AWith impulse response wABThe places calibration microphone B and the related signal of noise source can be calculated pnoise B；According to signal s and impulse response wsBCalculate the acoustic pressure p that secondary sound source sounding influences calibration microphone Bs B, then noise reduction The acoustic pressure p in regionB=pnoise B+ps B；
Finally, with acoustic pressure pBError signal as FxLMS Active noise controls controls the acoustic pressure in noise reduction region.
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CN113284480A (en) * 2020-12-11 2021-08-20 西安艾科特声学科技有限公司 Noise reduction effect estimation method for active noise control system

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CN113284480B (en) * 2020-12-11 2024-03-26 西安艾科特声学科技有限公司 Noise reduction effect estimation method for active noise control system

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