CN104036787B - A kind of speech monitoring method and equipment, and laser reflection sound localization method - Google Patents
A kind of speech monitoring method and equipment, and laser reflection sound localization method Download PDFInfo
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- G—PHYSICS
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- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
- G10L25/51—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for comparison or discrimination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
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Abstract
The present invention relates to a kind of speech monitoring method and equipment, and laser reflection sound localization method.The speech monitoring method includes obtaining reference light and measures the interference mixed frequency signal of light on the photosensor；Handled to obtain the M signal of DC component and sinusoidal pattern component including being proportional to total light intensity to the interference mixed frequency signal, the amplitude proportional of the sinusoidal pattern signal includes doppler phase in the intensity of reference light and measurement light, phase；After the M signal and reference signal are subtracted each other, voice signal is reduced into.The present invention causes the Vibration Condition of diverse location by laser reflection come Poul Dorset Sheep sound source, so that it is determined that the position of sound source and sound source play content.
Description
Technical field
The present invention relates to technical field of laser communication, more particularly to a kind of laser Doppler shift interference-type voice to supervise
Listen method and apparatus, and audio sound localization method.
Background technology
Laser voice analytic technique is by development for many years, and with the development of laser technology, its principle is on experimental study
It has been reached its maturity that, be transferred to practical application gradually, also begun to corresponding product occur on the market.It is external just at 20th century
Through being studied the technology.In the Gulf War, the U.S. just once listened to Iraq high-ranking military officer in automotive seats using the technology
The content of dialogue.
At present, the domestic research method in this technology is concentrated mainly on optical lever method (reflective hot spot Mobile Method) and half
Conductor Laser self-mixing interferometer method carries out audio parsing.Using optical lever method (reflective hot spot Mobile Method) for external environment
Interference requirement is relatively small, and detection range is remote, but uses the precision of this method detection low.Based on semiconductor laser self mixing frequency
The method of interference has that apparatus structure is simple, easy to adjust, the advantages that small volume, but because self-mixing process has interference pair
, signal stabilization relatively low, detection range too near the shortcomings of lower than degree..
The content of the invention
In view of the drawbacks described above of prior art, the technical problem to be solved in the present invention is to provide a kind of laser Doppler shift
The speech monitoring method and device of interference-type, and a kind of laser reflection sound localization method, it is different from existing optical lever
(reflective hot spot movement) and semiconductor laser self mixing frequency interference device, sound source is monitored come Poul Dorset Sheep by laser reflection,
Signal to noise ratio is improved, so as to reach higher detection accuracy.
Therefore, the technical solution adopted by the present invention is as follows：
A kind of speech monitoring method, including：
Obtain reference light and measure the interference mixed frequency signal of light on the photosensor；
Handled to obtain DC component and sinusoidal pattern component including being proportional to total light intensity to the interference mixed frequency signal
M signal, the amplitude proportional of the sinusoidal pattern signal includes Doppler's phase in the intensity of reference light and measurement light, phase
Position；
After the M signal and reference signal are subtracted each other, voice signal is reduced into.
Preferably, after the M signal and reference signal being subtracted each other, in addition to by being put with LPF adjustable gain
The step of big circuit and difference channel are amplified filtering to signal.
Preferably, the step of restoring acoustical signal is including the signal after subtracting each other is normalized, instead successively
Cosine function converts and sample process.
A kind of audio monitoring equipment, including detector and the controller that is connected with the detector, the detector include
Laser and transmit laser transmitting laser light path, laser is in the light path successively by the first speculum, the
Laser is divided into reflected light and transmitted light by two-mirror and light splitting piece, the light splitting piece, and the reflected light returns through spectroscope, warp
The light splitting piece enters photoelectric sensor；The transmitted light is focused in target through lens group, and the target has and can reflected
The function of light.
Preferably, the lens group is the lens group of focus adjustable, and it includes the first plano-convex that optical axis overlaps successively
Mirror, the second planoconvex lens and biconvex mirror, first planoconvex lens and the second planoconvex lens are oppositely arranged, second planoconvex lens with it is described
The distance between biconvex mirror is 15~17cm.
Further, the ratio of spectroscopical reflectivity and transmissivity is 1:9, the reflectivity of the light splitting piece and transmission
The ratio of rate is 1:1.
A kind of laser reflection sound localization method, including：
Obtain first laser reflected signal and second laser reflected signal simultaneously；
Maximum detection is carried out to the first laser reflected signal, threshold value is produced according to the maximum detected；
According to the threshold value, threshold value blob detection was carried out to the road laser reflection signal and obtains first M signal；
Interval division is carried out according to the first M signal and second laser signal, generates several data segments；
Central value weighted average is carried out to the data segment and smoothly carries out broad sense cross-correlation afterwards, is obtained by the coordinate value of relevant peaks
To time delay；
Time delay caused by the data segment is weighted and averagely obtains deviation value；
Positive and negative according to the deviation value obtains the offset direction of sound source, and the numerical values recited meter according to the deviation value
Calculate the position offset of sound source.
Further, it is described that broad sense cross-correlation is smoothly carried out afterwards to data segment progress central value weighted average, by correlation
Broad sense correlation time-delay estimate algorithm of the step of coordinate at peak is worth to time delay including the use of cepstral analysis, by asking two-way to believe
Cross-correlation between number cepstrum, and certain weighting is given in certain frequency domain, prominent related signal section and suppress to make an uproar
Sound interference sections, then inverse transformation obtain cross-correlation function to time domain, calculate the time delay between signal.
The present invention causes the Vibration Condition of diverse location by laser reflection come Poul Dorset Sheep sound source, with multiple means
Signal sampling and processing is realized, demodulates sound source vibration signal, so that it is determined that the position of sound source and sound source play content.Compared to
Existing technology, described laser-Doppler speech monitoring method and device use the light intensity for weakening reference light matched signal light；
The contrast of two-beam interference is improved, solves laser far-distance transmission because of hair in the lens group of detection light path increase focus adjustable section
Scattered angle causes hot spot to become big, realizes even hundreds of meters of a length of tens of rice of feeler arm；Detected in circuit de-noising using photoelectric sensor
Laser optical power is shaken, and is reduced laser noise by difference channel, signal to noise ratio is improved, so as to reach higher detection accuracy.
In addition, the present invention also has the advantages that：
1. reference light uses 1：9 (reflections：Transmission) spectroscope be used as speculum, reach balanced reference light and detect light light
Strong purpose, the contrast of interference fringe is greatly improved, improve signal to noise ratio, improve the measurement accuracy of system；
2. using diaphragm in frequency plane LPF, reduction laser light noise jamming, while preventing the interference of other light, carry
High system signal noise ratio；
3. reducing interference of the laser noise to system using the difference channel with gain adjustable amplifying circuit, further improve
System signal noise ratio；
4. use virtual instrument concept and technology, comprehensive high-speed dedicated data collecting card, Labview software programmings,
The utilization of Matlab tool box specials, realize the conversion of high-precision A/D, realized using more software Mixed-Programming Technologies it is powerful, flexible
Signal processing function, meet Instrument Development trend and trend.
5. solving the problems, such as that laser beam divergence caused hot spot to become big originally using lens group focusing and light path are reversible, and utilize
Relational implementation focus adjustment between lens group focal length and lens distance, realize different detection range focus adjustments.
Brief description of the drawings
Fig. 1 is laser Doppler shift interference-type audio monitoring device structure schematic diagram of the present invention；
Fig. 2 is the light channel structure in the embodiment of laser Doppler shift interference-type audio monitoring equipment one of the present invention
Schematic diagram；
Fig. 3 is the structural representation of lens group in Fig. 2.
Fig. 4 is the differential amplifier circuit for gathering signal, circuit mainly by the gain adjustable amplifying circuit with LPF and
Difference channel two parts form；
Fig. 5 is the signal schematic representation that photoelectric sensor collects；
Fig. 6 is the signal graph after differential amplifier circuit is handled, and is contrasted with Fig. 5 it is recognised that photoelectric sensor
After the signal detected treats by difference channel, substantial amounts of burr caused by laser noise is eliminated in waveform, is obtained
One very smooth waveform.
Fig. 7 is the front and rear signal waveform comparison diagram of labview programs filtering；
Fig. 8 is schematic diagram figure of the sound-reducing into voice signal；
Fig. 9 is the oscillogram for the wav file for being reduced into voice signal；
Figure 10 is the schematic diagram of laser reflection sound localization method of the present invention；
Figure 11 is the schematic diagram of sound localization method；
Figure 12 is the computing cross-correlation schematic diagram of auditory localization program, wherein the voice signal of figure (a) two-way collection, figure
(b) waveform table after cross-correlation；
Figure 13 is Labview programming flowcharts, the signal handled by difference channel, is adopted using data collecting card
Collection, call 2 detectors to amount to the signal of 2 passages by the NI-DAQ modules of Labview programs, generate discrete signal,
Reuse the control combination Matlab speeches inside Labview softwares be filtered, voice recognition and auditory localization.
Embodiment
Below in conjunction with the accompanying drawings, the present invention will be further described：
Embodiments of the invention are elaborated below in conjunction with the accompanying drawings, the present embodiment is premised on technical solution of the present invention
Under implemented, provide detailed embodiment and specific operating process, but protection scope of the present invention be not limited to it is following
Embodiment, for general technical staff of the technical field of the invention, on the premise of this design is not departed from, it can also do
Go out some simple deduction or replace, should all belong to protection scope of the present invention.
Embodiment 1
The embodiment of the present invention provides a kind of laser-Doppler interference-type speech monitoring method, to realize with laser beat frequency
Method detects the windowpane slight vibration caused by sound transmission, extracts from the signal of detection and swashs caused by windowpane vibration
Light Doppler beat frequency changes, and signal is demodulated and filtering process, finally restores voice messaging.This method includes：
Step S101：Obtain reference light and measure the interference mixed frequency signal of light on the photosensor；
Step S102：Handled to obtain DC component including being proportional to total light intensity and just to the interference mixed frequency signal
The M signal of chordwise component, the amplitude proportional of the sinusoidal pattern signal include in the intensity of reference light and measurement light, phase
Doppler phase；
Step S103：After the M signal and reference signal are subtracted each other, voice signal is reduced into.
Wherein, after the M signal and reference signal being subtracted each other, in addition to the adjustable gain amplification of band LPF is passed through
The step of circuit difference channel filters to signal.The step of restoring acoustical signal including to the signal after subtracting each other successively
It is normalized, inverse cosine function converts and sample process.
In addition, embodiment of the present invention additionally provides a kind of audio monitoring equipment, including detector and with the detector
The controller of connection, the detector include laser and transmit the light path of the laser of the laser transmitting, and laser is described
Pass through the first speculum, the second speculum and spectroscope in light path successively, laser is divided into reflected light and transmission by the light splitting piece
Light, the reflected light return through spectroscope, enter photoelectric sensor through the light splitting piece；The transmitted light focuses on through lens group
In target.
The lens group is the lens group of focus adjustable, its first planoconvex lens to be overlapped successively including optical axis, second
Planoconvex lens and biconvex mirror, first planoconvex lens and the second planoconvex lens are oppositely arranged, second planoconvex lens and the biconvex mirror
The distance between be 15~17cm.The ratio of spectroscopical reflectivity and transmissivity is 1:9, the reflectivity of the light splitting piece
Ratio with transmissivity is 1:1.
Spirit and substance of the present invention are discussed in detail by an embodiment with reference to monitor method and equipment.
As shown in Figure 2 and Figure 8, using Michelson's interferometer structure as basic framework in Fig. 2, optical axis and direction of vibration are measured
It is parallel.Laser beam passes through 1:It is divided into two after 1 light splitting piece M4 after dichroic mirror and refraction；1. reflected light (reference light) is passed through
1:9(R：T) spectroscope M3 reflections return after weakening 90% along original optical path, through 1:1 light splitting piece M4 reaches OPT101 photoelectric sensings
The photosurface of device 2,2. transmitted light (measurement light) combined lens focus is in glass pane front, windowpane reflected light carrying acoustic information
Returned along original optical path, through 1:The photosurface of OPT101 photoelectric sensors is reached after 1 dichroic mirror.So, reference light and measurement
Light realizes interference mixing on the photosurface of OPT101 photoelectric sensors 2.
The flow of laser monitor method is as follows：
The first step：Give windowpane one small vibration signal, glass pane front vibration displacement x (t) and doppler phaseRelation be
Second step：Reference light and detection light are radiated on OPT101 sensors simultaneously, because the voltage output of the sensor
It is directly proportional to the intensity of incident light, i.e., it is square directly proportional to optical electric field, here, if the reference light of t and detection light
Optical electric-field be
Wherein it is f laser frequencies,WithIt is initial phase,Phase place change caused by glass pane front vibration.
The output of detector is always proportional to square of total electric field
3rd step：Triangular transformation is made to above formula, because optical frequency claps signal much larger than optics, in detector output not
It can clearly observe therefore this frequency can omit, after arrangement：
4th step：OPT101 detectors will be detected simultaneously by two amounts：One DC component for being proportional to total light intensity, in addition
One is amplitude proportional in E1E2Or(I1And I2The intensity of two-beam), the sinusoidal pattern of doppler phase is included in phase
Signal, wherein doppler phaseDetermined by glass pane front vibration displacement x (t).
5th step：As shown in Figure 2, OPT101 sensors 1 will detect the direct current light intensity and optical noise of laser, and OPT101 is passed
Sensor 2 then detects the optical signal and optical noise of direct current light intensity, doppler phase cosine-modulation.
OPT101 photoelectric sensors 1 export photosignal U1 be
U1(t)=a+bN (t)
OPT101 photoelectric sensors 2 export photosignal U2 be
A in formula, c are the DC components as caused by sensor and pre-amplification circuit；B, d are voltage gain；To shake
Doppler phase caused by dynamic；For phase difference caused by optical path difference, N (t) is laser optical noise.
When adjusting voltage gain multiple b=d, two above-mentioned formulas are subtracted each other, and are obtained
Reach and suppress laser light influence of noise, improve the purpose of collection Signal-to-Noise and system sensitivity.
Designed circuit mainly forms original by the gain adjustable amplifying circuit with LPF and difference channel two parts
Reason figure is as shown in Figure 4.
Circuit mainly uses LM348 four high guaily unit chips, thus it is possible to vary the resistance of variable resistor realizes gain-adjusted, and it amplifies
One-level RC LPFs are employed before circuit, its cut-off frequency is
This cut-off frequency had not only remained human ear sensitive frequency in vibration signal but also can prevented in amplifying circuit because increasing
Benefit is inconsistent and produces self-oscillation so as to which caused phase is different.Test result indicates that if there is the different phenomenon of phase,
The difference that its drawback is to cause the electric signal of two OPT101 photoelectric sensors output is from effectively suppressing optical noise.Here lead to
Cross and the different phenomenon of the phase caused by self-oscillation is eliminated using one-level RC LPFs well before amplifying circuit, from
And the purpose for being suppressed optical noise with difference channel and being influenceed is really achieved, effect is as shown in Figure 5, Figure 6.
6th step：In sound-reducing program, filtered signal is normalized in Labview sound-reducing programs
Processing, willIn DC component reject, then to voltage boost coefficient carry out normalizing
After obtain：
After inverse cosine function conversion being carried out to above formula, convolutionAnd obtained after being sampled：
It can thus be concluded that arriving data signal I (i), the signal and vibration signal are linear, can directly save as wav lattice
Formula file, storage detection to voice signal.
Fig. 8 is the oscillogram of also original sound wav file, can be seen that system from the oscillogram in figure and detects character sound
An obvious signal wave bag will be produced during sound；By contrast have sound and it is quiet when vibrational waveform, find the sound of system
Sound reduction signal to noise ratio is very high.
The laser-Doppler interference-type audio monitoring device of the present invention requires very low for the oscillation intensity of vibration source, as long as
Amplitude vibration more than 0.1um can detect；In addition, the BURN-THROUGH RANGE of detector can at most reach 20m.Table 1
It is the key technical indexes parameter of the invention.
Embodiment 2
The embodiment of the present invention provides a kind of laser reflection sound source locating device, to realize to enter sound source by laser optical path difference
Row positioning, its positioning principle illustraton of model is as shown in Figure 10, is detected using two detection windowpanes different to two, according to
The optical path difference of sound transmission to two windowpanes establishes the model of auditory localization.
A kind of laser reflection sound localization method provided in an embodiment of the present invention, including：
Step S201：Obtain first laser reflected signal and second laser reflected signal simultaneously；
Step S202：Maximum detection is carried out to the first laser reflected signal, produced according to the maximum detected
Threshold value；
Step S203：According to the threshold value, threshold value blob detection was carried out to the road laser reflection signal and obtained among first
Signal；
Step S204：Interval division is carried out according to the first M signal and second laser signal, generates some numbers
According to section；
Step S205：Central value weighted average is carried out to the data segment and smoothly carries out broad sense cross-correlation afterwards, by relevant peaks
Coordinate be worth to time delay；
Step S206：Time delay caused by the data segment is weighted and averagely obtains deviation value；
Step S207：Positive and negative according to the deviation value obtains the offset direction of sound source, and according to the deviation value
Numerical values recited calculates the position offset of sound source.
Wherein, it is described that broad sense cross-correlation is smoothly carried out afterwards to data segment progress central value weighted average, by relevant peaks
Broad sense correlation time-delay estimate algorithm including the use of cepstral analysis of coordinate the step of being worth to time delay, by seeking two paths of signals
Cross-correlation between cepstrum, and certain weighting is given in certain frequency domain, protrude related signal section and suppress noise
Interference sections, then inverse transformation obtain cross-correlation function to time domain, calculate the time delay between signal
Spirit and substance of the present invention are described in detail with reference to an embodiment.
If the spread speed of sound is VS, the time difference that sound passes to windowpane is τ, and bias is A (to be partially upwards
Just), can obtain relational expression is：
Solve to obtain bias A by this three formulas be：
Auditory localization program is as shown in figure 11, wherein maximum detection is wherein first carried out all the way to the data that collect,
One threshold value is produced according to maximum, Bing Duigai roads signal carried out threshold value blob detection, and two groups of signals are just with obtained peak value
Left and right is divided by certain section centered on coordinate, generates several data segments.Each data segment of generation uses central value
Weighted average smoothly carries out broad sense cross-correlation afterwards, and delay, τ is calculated by the coordinate of relevant peaks.The time delay that all fragments obtain is entered
Row weighted average, by its it is positive and negative obtain the offset direction of sound source, according to its numerical values recited calculation position offset.
Auditory localization program is considered as sound and reverberation in a room be present, therefore uses the broad sense with cepstral analysis mutual
Associated time delays algorithm for estimating, certain add is given by seeking the cross-correlation between two paths of signals cepstrum, and in certain frequency domain
Power, protrude related signal section and suppress noise jamming part, then inverse transformation obtains cross-correlation function to time domain, calculates letter
Time delay between number, cross correlation results figure are as shown in figure 12.
It is the positioning experiment carried out in calm quiet environment from Figure 12, the cross-correlation fortune of auditory localization is understood from Figure 12 (b)
Peak value after calculation is very sharp steep, is disturbed less, and effect is very notable.
Figure 13 is Labview programming flowcharts, the signal handled by difference channel, is adopted using data collecting card
Collection, call 2 detectors to amount to the signal of 2 passages by the NI-DAQ modules of Labview programs, generate discrete signal,
Reuse the control combination Matlab speeches inside Labview softwares be filtered, voice recognition and auditory localization.
It should be understood that the invention is not limited in above-mentioned embodiment, every various changes or modifications to the present invention are not
Depart from the spirit and scope of the present invention, if these change and modification belong to the present invention claim and equivalent technologies scope it
Interior, then the present invention is also implied that comprising these changes and modification.
Claims (1)
- A kind of 1. speech monitoring method, it is characterised in that including：Obtain reference light and measure the interference mixed frequency signal of light on the photosensor；The interference mixed frequency signal is handled to obtain in DC component and sinusoidal pattern component including being proportional to total light intensity Between signal, the amplitude proportional of the sinusoidal pattern component includes doppler phase in the intensity of reference light and measurement light, phase；By after the signal subtraction of the M signal and reference light, voice signal is reduced into；By after the signal subtraction of the M signal and reference light, in addition to by band LPF gain adjustable amplifying circuit and The step of difference channel is amplified filtering to signal；The step of restoring acoustical signal including the signal after subtracting each other is normalized successively, inverse cosine function conversion And sample process；In sound-reducing program, filtered signal is normalized in Labview sound-reducing programs, willIn DC component reject, then to voltage boost coefficient carry out normalizing after obtain：Wherein a, c are the DC components as caused by sensor and pre-amplification circuit；D is voltage gain；To be more caused by vibration General Le phase；Δφ0For phase difference caused by optical path difference, φ0It is caused initial phase when two beam laser are interfered, U (t) It is the voltage of detector output；After inverse cosine function conversion being carried out to above formula, convolutionAnd obtained after being sampled：It can thus be concluded that arriving data signal I (i), the signal and vibration signal are linear, can directly save as wav forms text Part, storage detection to voice signal.
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| CN201610848155.XA CN106448699A (en) | 2014-03-05 | 2014-03-05 | Voice audio monitor device |
| CN201610848216.2A CN106448703A (en) | 2014-03-05 | 2014-03-05 | Laser reflection sound source positioning method |
| CN201410078849.0A CN104036787B (en) | 2014-03-05 | 2014-03-05 | A kind of speech monitoring method and equipment, and laser reflection sound localization method |
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| CN106448703A (en) | 2017-02-22 |
| CN106448699A (en) | 2017-02-22 |
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