CN109935227A - Voice signal pick device, method and intelligent terminal under noise circumstance - Google Patents
Voice signal pick device, method and intelligent terminal under noise circumstance Download PDFInfo
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Abstract
Voice signal pick device, method and intelligent terminal under noise circumstance provided in an embodiment of the present invention, by locking phase amplification method by the synchronization signal quadruple of acousto-optic frequency shifters, local oscillation signal as quadrature demodulator, higher phase stability can be obtained, to improve system to the vibration displacement demodulation accuracy of testee, to improve the signal-to-noise ratio and detectable limit of sound, random phase noise error is effectively reduced, improves detection accuracy and discrimination.
Description
Technical field
Voice signal pick device, method the present invention relates to acoustic processing field, in particular under a kind of noise circumstance
And intelligent terminal.
Background technique
Smart home just gradually comes into people's lives, and future is expected to welcome the growth of explosion type.Touch-control, gesture and voice
It is the three big modes that current smart machine is interacted with people, wherein interactive voice is more convenient in household scene, so more by blueness
It looks at.
The interactive voice of Intelligent hardware is influenced by the multiple complicated factor such as distance, background noise, echo, reverberation at present.
There is preferable recognition effect under proximity condition, but under the conditions of remote, for example, 3~10 meters it is even farther away from
From discrimination reduces a lot so that not being available.
Summary of the invention
In view of this, the embodiment of the invention provides voice signal pick device, method and intelligence under a kind of noise circumstance
Energy terminal device, can effectively be dropped the synchronization signal of the acousto-optic frequency shifters method synchronous with photodetection signal by phase-lock technique
The low random phase noise error improves detection accuracy.
In a first aspect, the voice signal pick device under a kind of noise circumstance, including laser interference system, there is synchronous letter
Number output acousto-optic frequency shifters, lock-in amplifier, photodetector, quadrature demodulator and signal processing system, the laser
Interference system includes at least laser, the first beam splitter, the second beam splitter and third beam splitter, is issued by the laser
Laser is divided into transmitted light beam and deflecting light beams after first beam splitter, and the projecting beam passes through second beam splitter
After be radiated on testee generation diffusing reflection light beam, the diffusing reflection light beam is by second beam splitter, the third point
Shu Jing reflexes to the photodetector, and the deflecting light beams are incident to after frequency shift (FS) is fixed in the acousto-optic frequency shifters and pass through
The photodetector is transmitted through by the third beam splitter, the deflecting light beams and the diffusing reflection light beam two-way interference of light produce
Raw interference signal enters the photodetector and is converted into electric signal, and the acousto-optic frequency shifters export the synchronization signal through locking phase
Local oscillation signal needed for amplifier quadruplication frequency generates quadrature demodulation, the quadrature demodulator is using the local oscillation signal to institute
It states and exports two orthogonal signalling to the signal processing system after electric signal is demodulated, the signal processing system is to described two
A orthogonal signalling carry out the displacement signal that processing obtains testee.
Optionally, the signal processing system is specifically used for negating to the ratio of two orthogonal signalling at tangent and inverse folding
Reason obtains the displacement signal of testee.
Optionally, the transmitted light beam is irradiated to the frequency shift amount Δ f and testee that testee generates Doppler frequency shift
Relationship between speed v are as follows: Δ f=2v/ λ, wherein λ is the wavelength of laser.
Optionally, phase of light wave changes mobile λ/2 in position of 360 ° of corresponding testees.
Optionally, local oscillation signal of the lock-in amplifier output quadruple signal as quadrature demodulator.
Optionally, the photodetector uses avalanche photodide.
Optionally, the laser uses wavelength for the laser of 633nm, and the every variation of phase was once corresponding to vibration displacement and is being
0.88nm。
Second aspect, the voice signal pick-up method under a kind of noise circumstance, applied to the sound under above-mentioned noise circumstance
Signal pickup device, which comprises
It is divided into transmitted light beam and deflecting light beams, the projecting beam after the first beam splitter by the laser that laser issues
Generation diffusing reflection light beam on testee is radiated at after the second beam splitter, the diffusing reflection light beam passes through second beam splitting
Mirror, third beam splitter reflex to photodetector；
The deflecting light beams are incident to acousto-optic frequency shifters and are fixed after frequency shift (FS) through being transmitted by the third beam splitter
To photodetector, the deflecting light beams and the diffusing reflection light beam two-way interference of light generate interference signal and visit into the photoelectricity
It surveys device and is converted into electric signal；
Acousto-optic frequency shifters export local oscillator needed for synchronization signal generates quadrature demodulation through lock-in amplifier quadruplication frequency and believe
Number；
Quadrature demodulator carries out demodulation backward signal processing system output two to the electric signal using the local oscillation signal
A orthogonal signalling；
The signal processing system carries out the displacement signal that processing obtains testee to described two orthogonal signalling.
Optionally, the signal processing system carries out the displacement letter that processing obtains testee to described two orthogonal signalling
Number, comprising:
The signal processing system negates to the ratio of two orthogonal signalling, and simultaneously inverse folding processing obtains testee to tangent
Displacement signal.
The third aspect, a kind of intelligent terminal have such as the voice signal pick device under above-mentioned noise circumstance.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that
Voice signal pick device, method and intelligent terminal under noise circumstance provided in an embodiment of the present invention lead to
It crosses phase-lock technique the synchronization signal of acousto-optic frequency shifters is synchronous with the electric signal of photodetector, higher phase stabilization can be obtained
Property, to improve the vibration displacement demodulation accuracy of system, the signal-to-noise ratio and detectable limit of sound are improved, the random phase is effectively reduced
Position noise error, improves detection accuracy and discrimination.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the voice signal pick device under the noise circumstance in the embodiment of the present invention；
Fig. 2 is the flow chart of the voice signal pick-up method under the noise circumstance in the embodiment of the present invention.
Appended drawing reference:
Laser 1, the first beam splitter 11, the second beam splitter 12, third beam splitter 13, acousto-optic frequency shifters 2, lock-in amplifier
3, photodetector 4, quadrature demodulator 5, signal processing system 6.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work
It encloses.
Description and claims of this specification and term " first ", " second ", " third ", " in above-mentioned attached drawing
The (if present)s such as four " are to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should manage
The data that solution uses in this way are interchangeable under appropriate circumstances, so that the embodiments described herein can be in addition to illustrating herein
Or the sequence other than the content of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that
Cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units need not limit
In step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, produce
The other step or units of product or equipment inherently.
As shown in connection with fig. 1, the voice signal pick device under a kind of noise circumstance is provided in the embodiment of the present invention, including is swashed
Interference of light system, the acousto-optic frequency shifters 2 with synchronization signal output, lock-in amplifier 3, photodetector 4, quadrature demodulator 5
And signal processing system 6, the laser interference system include at least laser 1, the first beam splitter 11, the second beam splitter 12 with
And third beam splitter 13, the laser issued by the laser 1 are divided into transmitted light beam and folding after first beam splitter 11
Irradiating light beam, the projecting beam is radiated at generation diffusing reflection light beam on testee after second beam splitter 12, described
Diffusing reflection light beam reflexes to the photodetector 4, the refraction by second beam splitter 12, the third beam splitter 13
Light beam is incident to the acousto-optic frequency shifters 2 and is fixed after frequency shift (FS) through being transmitted through the photoelectricity by the third beam splitter 13
Detector 4, the deflecting light beams and the diffusing reflection light beam two-way interference of light generate interference signal and enter the photodetector 4
It is converted into electric signal, the acousto-optic frequency shifters 2 export the synchronization signal through lock-in amplifier lock-in amplifier 3 quadruplication frequency
Local oscillation signal needed for generating quadrature demodulation afterwards, the quadrature demodulator 5 carry out the electric signal using the local oscillation signal
Two orthogonal signalling are exported to the signal processing system 6 after demodulation, the signal processing system 6 is to described two orthogonal signalling
The displacement signal that processing obtains testee is carried out, lock-in amplifier 3, locking phase are passed to by 2 synchronization signal of acousto-optic frequency shifters
Amplifier 3 exports quadruple signal, as the local oscillation signal of quadrature demodulator 5, improves phase stability and phase demodulating essence
Degree；In addition, laser is carried out shift frequency interference using difference interference principle by laser interference system, photodetector 4 is used to detect dry
Intensity is related to, and transmits two orthogonal signalling to signal processing system 6, signal processing system 6 seeks the ratio of two orthogonal signalling
Arc tangent and inverse folding are tested the displacement signal of vibrating body to acquisition, with traditional directly to 5 local oscillation signal of quadrature demodulator
It compares, this programme can obtain higher phase stability, to improve the vibration displacement demodulation accuracy of system, improve the letter of sound
Make an uproar than and detectable limit.
Difference interference principle is referred to and uses the monochromatic light of two kinds of different frequencies as measuring beam and reference beam, is led to
Cross the mixing of photodetector 4, output difference frequency signal (limited by 4 frequency response of photodetector, frequency difference generally 100 megahertzs with
It is interior), variation phase of light wave as caused by displacement, vibration, rotation, atmospheric perturbation etc. variation of testee or Doppler frequency shift carry
In on difference frequency, demodulated to can be obtained measured data, those of ordinary skill in the art, which are understood that, does not repeat this.
It should be noted that for the processing of above-mentioned inverse folding, it can be using in matlab tool software
Unwrap (w) solution winding, jumps phase not at pi, so that true phase change is reflected, the common skill in this field
Art personnel are not it is to be appreciated that repeat specifically.
In the present embodiment, photodetector 4 uses avalanche photodide, and avalanche photodide is a kind of p-n junction type
Light detection diode, wherein the avalanche multiplication effect of carrier is utilized to amplify photosignal to improve the sensitive of detection
Degree, those of ordinary skill in the art can also use other similar component, not limit this.
Optionally, the laser 1 uses wavelength for the laser of 633nm, such as He-Ne laser, krypton ion laser
Correspond to vibration displacement once Deng the every variation of, phase as 0.88nm, do not limiting this.
Optionally, the first beam splitter 11 mentioned in the present embodiment, the second beam splitter 12, third beam splitter 13 can use
The beam splitter of same size, beam splitter are mainly used for for incident beam being divided into two beams of transmission and reflection with certain beam intensity ratio
Light has fixed splitting ratio beam splitter and variable two class of splitting ratio beam splitter.Variable splitting ratio beam splitter has step and continuous temporary again
Point of change, the structural formula of beam splitter are on the right-angle prism inclined-plane for film layer is plated in 45 °, then the rib of a glued same shape
Mirror constitutes glued cube, and those of ordinary skill in the art are not it is to be appreciated that repeat specifically.
A kind of operative scenario of voice signal pick device under noise circumstance provided by the invention can be it is such, swash
The laser that light device 1 issues is divided into two-way through beam splitter, is irradiated on measured object all the way, and laser generates diffusing reflection and return system,
Another way deviates fixed frequency through acousto-optic frequency shifters 2, and two-way light generates interference, and interference signal is converted into telecommunications through avalanche probe
Number, Doppler frequency shift, the relationship between frequency shift amount Δ f and testee speed can be generated in laser irradiation to testee are as follows:
Δ f=2v/ λ, wherein λ be laser wavelength, by quadrature demodulation can obtain testee vibration displacement, speed and add
Speed signal.In the present invention, the synchronization signal that acousto-optic frequency shifters 2 export generates orthogonal solution through lock-in amplifier 3 quadruplication frequency
Local oscillation signal needed for adjusting, quadrature demodulator 5 negates to the ratio of I signal, Q signal after demodulating, and simultaneously inverse folding obtains phase letter to tangent
Breath, since laser is reflected once, therefore phase of light wave changes mobile λ/2 in position of 360 ° of corresponding testees, the program and biography
Comparing directly to 5 local oscillation signal of quadrature demodulator for system, can obtain higher phase stability, to improve the vibration position of system
Demodulation accuracy is moved, the signal-to-noise ratio and detectable limit of sound are improved.
As shown in connection with fig. 2, accordingly, the present invention provides the voice signal pick-up method under a kind of noise circumstance, is applied to
Voice signal pick device under above-mentioned noise circumstance, which comprises
S201, it is divided into transmitted light beam and deflecting light beams, the throwing after the first beam splitter by the laser that laser issues
Irradiating light beam is radiated on testee generation diffusing reflection light beam after the second beam splitter, and the diffusing reflection light beam is by described the
Two beam splitters, third beam splitter reflex to photodetector；
S202, the deflecting light beams are incident to acousto-optic frequency shifters and are fixed after frequency shift (FS) through by the third beam splitter
It is transmitted through photodetector, the deflecting light beams and the diffusing reflection light beam two-way interference of light generate interference signal and enter the light
Electric explorer is converted into electric signal；
Sheet needed for S203, acousto-optic frequency shifters output synchronization signal generate quadrature demodulation through lock-in amplifier quadruplication frequency
Shake signal；
S204, quadrature demodulator using the local oscillation signal to the electric signal carry out demodulation backward signal processing system it is defeated
Two orthogonal signalling out；
S205, the signal processing system carry out the displacement letter that processing obtains testee to described two orthogonal signalling
Number.
In step S204, the signal processing system negates to the ratio of two orthogonal signalling, and simultaneously inverse folding is handled tangent
Obtain the displacement signal of testee.
Accordingly, the present invention also provides a kind of intelligent terminals, have such as the voice signal under above-mentioned noise circumstance
Pick device, intelligent terminal can be smart home device, and such as sweeping robot can also make to nurse robot, reception
Robot etc. can carry out remote speech interaction, tool by using the voice signal pick device under above-mentioned noise circumstance
There is preferable recognition effect, promotes the response speed to user instruction.
Voice signal pick device, method and intelligent terminal under noise circumstance provided in an embodiment of the present invention lead to
It crosses phase-lock technique the synchronization signal of acousto-optic frequency shifters is synchronous with the electric signal of photodetector, higher phase stabilization can be obtained
Property, to improve the vibration displacement demodulation accuracy of system, the signal-to-noise ratio and detectable limit of sound are improved, the random phase is effectively reduced
Position noise error, improves detection accuracy and discrimination.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random
Access Memory), disk or CD etc..
Voice signal pick device, method and the intelligent terminal under a kind of noise circumstance provided by the present invention are set above
It is standby to be described in detail, for those of ordinary skill in the art, thought according to an embodiment of the present invention, in specific embodiment party
There will be changes in formula and application range, in conclusion the contents of this specification are not to be construed as limiting the invention.
Claims (10)
1. the voice signal pick device under a kind of noise circumstance, which is characterized in that including laser interference system, there is synchronous letter
Number output acousto-optic frequency shifters, lock-in amplifier, photodetector, quadrature demodulator and signal processing system, the laser
Interference system includes at least laser, the first beam splitter, the second beam splitter and third beam splitter, is issued by the laser
Laser is divided into transmitted light beam and deflecting light beams after first beam splitter, and the projecting beam passes through second beam splitter
After be radiated on testee generation diffusing reflection light beam, the diffusing reflection light beam is by second beam splitter, the third point
Shu Jing reflexes to the photodetector, and the deflecting light beams are incident to after frequency shift (FS) is fixed in the acousto-optic frequency shifters and pass through
The photodetector is transmitted through by the third beam splitter, the deflecting light beams and the diffusing reflection light beam two-way interference of light produce
Raw interference signal enters the photodetector and is converted into electric signal, and the acousto-optic frequency shifters export the synchronization signal through locking phase
Local oscillation signal needed for amplifier quadruplication frequency generates quadrature demodulation, the quadrature demodulator is using the local oscillation signal to institute
It states and exports two orthogonal signalling to the signal processing system after electric signal is demodulated, the signal processing system is to described two
A orthogonal signalling carry out the displacement signal that processing obtains testee.
2. the voice signal pick device under noise circumstance according to claim 1, which is characterized in that the signal processing
System be specifically used for the ratio of two orthogonal signalling negate tangent and inverse folding processing obtain testee displacement signal.
3. the voice signal pick device under noise circumstance according to claim 1, which is characterized in that the transmitted light beam
The relationship being irradiated between the frequency shift amount Δ f and testee speed v of testee generation Doppler frequency shift are as follows: Δ f=2v/ λ,
Wherein, λ is the wavelength of laser.
4. the voice signal pick device under noise circumstance according to claim 3, which is characterized in that phase of light wave variation
Mobile λ/2 in the position of 360 ° of corresponding testees.
5. the voice signal pick device under noise circumstance according to claim 1, which is characterized in that the locking phase amplification
Device exports local oscillation signal of the quadruple signal as quadrature demodulator.
6. the voice signal pick device under noise circumstance according to claim 1, which is characterized in that the photodetection
Device uses avalanche photodide.
7. the voice signal pick device under noise circumstance according to claim 1, which is characterized in that the laser is adopted
The laser for being 633nm with wavelength, it is 0.88nm that the every variation of phase, which was once corresponding to vibration displacement,.
8. the voice signal pick-up method under a kind of noise circumstance, which is characterized in that be applied to as any in claim 1 to 7
Voice signal pick device under the item noise circumstance, which comprises
It is divided into transmitted light beam and deflecting light beams after the first beam splitter by the laser that laser issues, the projecting beam passes through
Be radiated on testee generation diffusing reflection light beam after second beam splitter, the diffusing reflection light beam by second beam splitter,
Third beam splitter reflexes to photodetector；
The deflecting light beams are incident to acousto-optic frequency shifters and are fixed after frequency shift (FS) through being transmitted through light by the third beam splitter
Electric explorer, the deflecting light beams and the diffusing reflection light beam two-way interference of light generate interference signal and enter the photodetector
It is converted into electric signal；
Acousto-optic frequency shifters export local oscillation signal needed for synchronization signal generates quadrature demodulation through lock-in amplifier quadruplication frequency；
Quadrature demodulator carries out demodulation backward signal processing system to the electric signal using the local oscillation signal and is exporting two just
Hand over signal；
The signal processing system carries out the displacement signal that processing obtains testee to described two orthogonal signalling.
9. the voice signal pick-up method under noise circumstance according to claim 8, which is characterized in that the signal processing
System carries out the displacement signal that processing obtains testee to described two orthogonal signalling, comprising:
The signal processing system to the ratio of two orthogonal signalling negate tangent and inverse folding processing obtain testee position
Shifting signal.
10. a kind of intelligent terminal, which is characterized in that have under the noise circumstance as described in any one of claims 1 to 7
Voice signal pick device.
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| CN201711372049.XA CN109935227B (en) | 2017-12-19 | 2017-12-19 | Sound signal pickup device and method in noise environment and intelligent terminal equipment |
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| CN201711372049.XA CN109935227B (en) | 2017-12-19 | 2017-12-19 | Sound signal pickup device and method in noise environment and intelligent terminal equipment |
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| CN111006754A (en) * | 2019-12-31 | 2020-04-14 | 杭州爱莱达科技有限公司 | Scanning type multi-channel coherent laser pickup method and device |
| CN111128217A (en) * | 2019-12-31 | 2020-05-08 | 杭州爱莱达科技有限公司 | Distributed multi-channel voice coherent laser radar interception method and device |
| CN111157098A (en) * | 2019-12-31 | 2020-05-15 | 中国科学院长春光学精密机械与物理研究所 | Demodulation device for simultaneously obtaining amplitude and phase of vibration signal |
| CN112037753A (en) * | 2020-09-04 | 2020-12-04 | 东南大学 | Method and system for restoring sound in real time by using bulb |
| CN113280905A (en) * | 2021-06-02 | 2021-08-20 | 中国科学院长春光学精密机械与物理研究所 | Laser testing device and method thereof |
| CN113686425A (en) * | 2021-08-23 | 2021-11-23 | 杭州越光智能科技有限公司 | Photon pickup method and device based on double light paths |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111006754A (en) * | 2019-12-31 | 2020-04-14 | 杭州爱莱达科技有限公司 | Scanning type multi-channel coherent laser pickup method and device |
| CN111128217A (en) * | 2019-12-31 | 2020-05-08 | 杭州爱莱达科技有限公司 | Distributed multi-channel voice coherent laser radar interception method and device |
| CN111157098A (en) * | 2019-12-31 | 2020-05-15 | 中国科学院长春光学精密机械与物理研究所 | Demodulation device for simultaneously obtaining amplitude and phase of vibration signal |
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| CN113280905A (en) * | 2021-06-02 | 2021-08-20 | 中国科学院长春光学精密机械与物理研究所 | Laser testing device and method thereof |
| CN113686425A (en) * | 2021-08-23 | 2021-11-23 | 杭州越光智能科技有限公司 | Photon pickup method and device based on double light paths |
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