CN1858844A - Quick realizing method for double sound source identification and signal separation - Google Patents
Quick realizing method for double sound source identification and signal separation Download PDFInfo
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- CN1858844A CN1858844A CNA2006100407812A CN200610040781A CN1858844A CN 1858844 A CN1858844 A CN 1858844A CN A2006100407812 A CNA2006100407812 A CN A2006100407812A CN 200610040781 A CN200610040781 A CN 200610040781A CN 1858844 A CN1858844 A CN 1858844A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 23
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- 238000005259 measurement Methods 0.000 claims description 4
- 230000000644 propagated effect Effects 0.000 claims 1
- 230000005236 sound signal Effects 0.000 abstract 1
- 238000004088 simulation Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 2
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Abstract
This invention discloses a quick realization method for double sound source identification and signal separation including: 1, when two sound sources or two paths of sound signals are transmitted in air, a particle velocity sensor and a sound-pressure sensor are put at any place connecting the two sources to test a sound pressure p of a compound sound field and a movement velocity of air particles expressed as: p=p1+p2, v=v1-v2, 2, the separation of the two paths of signals are realized: p1=(p+pcv)/2, p2=(p-pcv)/2 by plane wave supposing the relation of the sound-pressure and the particle velocity, p1=pcv1, p2=pcv2 or in almost far field.
Description
One, technical field
The present invention relates to the method for identification of sound source and Signal Separation, especially relate to the Fast implementation of a kind of double sound source identification and Signal Separation.
Two, background technology
Double sound source identification and Signal Separation are meant to be determined only to have two sound sources, but does not know and restore sound source and original signal thereof according to the composite signal that receives under the situation of original signal relevant information.Main practical occasion has: voice extract in Machine Fault Diagnosis, the meeting.Existing signal separating method mainly is based on statistics and the means of signal Processing and carries out Signal Separation on software or the algorithm, need be cost with operation time.How to realize double sound source identification and Signal Separation fast, in other document, also do not introduce at present by measuring.
Three, summary of the invention
1, goal of the invention: the object of the present invention is to provide a kind of double sound source identification of quick measurement and the Fast implementation of Signal Separation.
2, technical scheme: for achieving the above object, the Fast implementation of double sound source identification of the present invention and Signal Separation is characterized in that this method may further comprise the steps:
(acoustic pressure is respectively p for (1) two sound source or two-way acoustical signal
1, p
2, particle velocity is respectively v
1, v
2) under the situation about in air, propagating, particle velocity sensors and sound pressure sensor are placed on the optional position of two sound source lines, measure the acoustic pressure p of compound sound field and the movement velocity v of air particle.Acoustic pressure that records and particle velocity can be expressed as:
p＝p
1+p
2 (1)
v＝v
1-v
2 (2)
(2) utilize the relation (ρ and c are respectively the density and the airborne acoustic velocity of air) of acoustic pressure and particle velocity in the plane wave approximation (or far-field approximation),
p
1＝ρcv
1 (3)
p
2＝ρcv
2 (4)
Realize the separation of two paths of signals:
p
1＝(p+ρcv)/2 (5)
p
2＝(p-ρcv)/2 (6)
Has good prospect by numerical simulation and experimental study proof the present invention in the application in identification of sound source and Signal Separation.
3, beneficial effect: the present invention compared with prior art, its remarkable advantage is to utilize method of the present invention can realize the identification and the Signal Separation of double sound source fast.
Four, description of drawings
Fig. 1 is a principle schematic of the present invention.
Fig. 2 is a two-way original signal in the numerical simulation.
Fig. 3 is compound field acoustic pressure and the particle velocity that records in the numerical simulation.
Fig. 4 is the result that Signal Separation obtains in the numerical simulation.
Fig. 5 is that device is put synoptic diagram in the experiment.
Fig. 6 is compound field acoustic pressure and the particle velocity normalization figure that Mike's stream records in the experiment.
Fig. 7 is the two paths of signals that obtains after experiment separates.
Five, embodiment
Embodiment 1: the numerical simulation of double sound source identification and Signal Separation.
Used equipment comprises computing machine and matlab software.
The method of double sound source identification and Signal Separation is:
1, the function that utilizes matlab to provide produces two groups of plane waves, and the frequency of original signal 1 is 1kHz, and amplitude is 2; The frequency of original signal 2 is 2kHz, and amplitude is 1, and concrete waveform is seen Fig. 1.
2, compound acoustic pressure utilizing the stack (formula (1,2)) of acoustic pressure and particle velocity to simulate can to measure and particle velocity are specifically seen Fig. 2 over time.
3, utilize the relation (formula (5,6)) of plane wave acoustic pressure and particle velocity, separate two paths of signals.
Interpretation of result: the sound pressure level of the two paths of signals that obtains after separating as shown in Figure 3.Comparison diagram 3 can find to separate later result with Fig. 1 and original signal in full accord, illustrate and measure compound acoustic pressure simultaneously and particle velocity realizes that the method for double sound source identification and Signal Separation is feasible on numerical simulation.
Embodiment 2: the experiment in identification of sound source and the Signal Separation.
Usedly comprise that anechoic room, two of sound equipments, Mike flow USP probe, pressure calibration device, B﹠amp; K microphone 4190, B﹠amp; K pulse multichannel analyzer, two in power amplifier, signal wire support are some.
Method:
1, press Fig. 5 arranging apparatus in anechoic room, for each sound source, measure the acoustic pressure of loca earlier with the good microphone of calibration, calibration Mike flows the sensitivity of the sound pressure sensor of USP probe.Utilize the relation of acoustic pressure and particle velocity under the far-field approximation (to require the placed point to satisfy kr＞＞1 again to the position r of sound source, wherein k is a wave number, can be expressed as k=2 π f/c with the frequency f of signal), calibration Mike flows the sensitivity of USP probe particle velocity sensors.
2, excite two sound sources simultaneously,, see Fig. 6 with compound acoustic pressure of Mike's flow measurement and particle velocity.Sound source 1 is the 1kHz simple signal, and sound source 2 is the 1.5kHz simple signal.
3, utilize the relation (formula (5,6)) of plane wave acoustic pressure and particle velocity, separate two paths of signals.
Interpretation of result: the sound pressure level of the two paths of signals that obtains after the separation as shown in Figure 7.Can find to separate later signal is single-frequency 1.5kHz and 1kHz, in full accord with original signal, illustrates that the method for measuring compound acoustic pressure and particle velocity realization double sound source identification and Signal Separation simultaneously also is feasible experimentally.
Claims (1)
1, the Fast implementation of a kind of double sound source identification and Signal Separation is characterized in that this method may further comprise the steps:
(1) under the situation that two sound sources or two-way acoustical signal are propagated in air, particle velocity sensors and sound pressure sensor are placed on the optional position of two sound source lines, measure the acoustic pressure p of compound sound field and the movement velocity v of air particle, and can be expressed as: p=p
1+ p
2, v=v
1-v
2, p wherein
1, p
2Be the acoustic pressure that two sound sources produce in measurement point, v
1, v
2Be two particle velocities that sound source excites in measurement point;
(2) utilize the relation of acoustic pressure and particle velocity in plane wave approximation or the far-field approximation, p
1=ρ cv
1, p
2=ρ cv
2, realize the separation of two paths of signals:
p
1＝(p+ρcv)/2、p
2＝(p-ρcv)/2
Wherein ρ and c are respectively the density and the airborne acoustic velocity of air.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100407812A CN1858844A (en) | 2006-06-01 | 2006-06-01 | Quick realizing method for double sound source identification and signal separation |
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| CNA2006100407812A CN1858844A (en) | 2006-06-01 | 2006-06-01 | Quick realizing method for double sound source identification and signal separation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101566496B (en) * | 2009-06-05 | 2010-09-01 | 合肥工业大学 | Method for sound field separation by double plane vibration speed measurement and equivalent source method |
-
2006
- 2006-06-01 CN CNA2006100407812A patent/CN1858844A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101566496B (en) * | 2009-06-05 | 2010-09-01 | 合肥工业大学 | Method for sound field separation by double plane vibration speed measurement and equivalent source method |
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