CN104036787A - Method and device for voice interception, and laser-bounce voice source locating method - Google Patents
Method and device for voice interception, and laser-bounce voice source locating method Download PDFInfo
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- 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
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Abstract
The invention relates to a method and a device for voice interception, and a laser-bounce voice source locating method. The method for voice interception comprises the steps of obtaining an interference mixed signal of reference light and measuring light on a photoelectric sensor, processing the interference mixed signal to obtain a middle signal comprising a direct-current component directly proportional to total light intensity and a sinusoidal component, subtracting a reference signal from the middle signal for restoring into a voice signal, wherein the amplitude of the sinusoidal signal is directly proportional to the intensity of the reference light and that of the measuring light. The method is used for non-contact detection of vibration conditions in different positions caused by a voice source by use of laser-bounce, and therefore, the position of the voice source and the playing contents of the voice source can be determined.
Description
Technical field
The present invention relates to laser communication technology field, in particular a kind of laser-Doppler frequency displacement interfere type speech monitoring method and equipment, and audio frequency sound localization method.
Background technology
Laser audio frequency analytic technique is through development for many years, and along with the development of laser technology, its principle reaches its maturity on experimental study, has gradually proceeded to practical application, also starts on the market to occur corresponding product.In the time of 20th century, abroad with regard to Ying Jing, this technology is studied.In the Gulf War, the U.S. was just once used this technology to listen to the content of Iraq high-ranking military officer dialogue in automotive seats.
At present, the domestic research method in this technology mainly concentrates on optical lever method (reflective hot spot Mobile Method) and semiconductor laser self mixing frequency interferometric method is carried out audio frequency parsing.Adopt optical lever method (reflective hot spot Mobile Method) relatively little for the interference requirement of external environment, detection range is far away, but the precision that adopts the method to survey is low.The advantages such as it is simple, easy to adjust that the method that based semiconductor laser self-mixing translation is interfered has apparatus structure, and volume is little, but because existing, self-mixing process interferes the shortcomings such as contrast is low, signal stabilization is relatively low, detection range is too near.。
Summary of the invention
In view of the above-mentioned defect of prior art, the technical problem to be solved in the present invention is to provide a kind of speech monitoring method and device of laser-Doppler frequency displacement interfere type, and a kind of laser reflection sound localization method, it is different from existing optical lever (reflective hot spot moves) and semiconductor laser self mixing frequency interference device, carry out contactless Anti－Sniffer sound source by laser reflection, improve signal to noise ratio (S/N ratio), thereby arrive higher detection accuracy.
For this reason, the technical solution used in the present invention is as follows:
A kind of speech monitoring method, comprising:
Obtain reference light and measure the interference mixed frequency signal of light on photoelectric sensor;
Described interference mixed frequency signal is processed and obtained comprising and be proportional to the DC component of total light intensity and the M signal of sinusoidal pattern component, and the amplitude of described sinusoidal pattern signal is proportional to reference light and measures light intensity, comprises doppler phase in phase place;
After described M signal and reference signal are subtracted each other, be reduced into voice signal.
Preferably, after described M signal and reference signal are subtracted each other, also comprise the step by signal being carried out with low-pass filtering gain adjustable amplifying circuit and difference channel amplification filtering.
Preferably, the step of described restoring acoustical signal comprise to the signal after subtracting each other be normalized successively, inverse cosine function conversion and sample process.
A kind of audio monitoring equipment, comprise detector and the controller being connected with described detector, described detector comprises laser instrument and transmits the light path of the laser of described laser instrument transmitting, laser in described light path successively through the first catoptron, the second catoptron and light splitting piece, laser is divided into reflected light and transmitted light by described light splitting piece, described reflected light returns through spectroscope, enters photoelectric sensor through described light splitting piece; Described transmitted light focuses in target through lens combination, and described target has can catoptrical function.
Preferably, described lens combination is the adjustable lens combination of focal length, it comprises the first planoconvex lens, the second planoconvex lens and biconvex mirror that optical axis overlaps successively, and described the first planoconvex lens and the second planoconvex lens arrange in opposite directions, and the distance between described the second planoconvex lens and described biconvex mirror is 15～17cm.
Further, the ratio of described spectroscopical reflectivity and transmissivity is 1:9, and the reflectivity of described light splitting piece and the ratio of transmissivity are 1:1.
A kind of laser reflection sound localization method, comprising:
Obtain the first laser reflection signal and the second laser reflection signal simultaneously;
Described the first laser reflection signal is carried out to maximal value detection, produce threshold value according to the maximal value detecting;
According to described threshold value, Dui Gai road laser reflection signal carried out the detection of threshold value peak and obtained the first M signal;
Carry out interval division according to described the first M signal and the second laser signal, generate several data segments;
Described data segment is carried out to central value weighted mean and carry out broad sense simple crosscorrelation after level and smooth, obtain time delay by the coordinate figure of relevant peaks;
The time delay that described data segment is produced is weighted and on average obtains deviation value;
According to the positive and negative offset direction that obtains sound source of described deviation value, and according to the position offset of the numerical values recited calculating sound source of described deviation value.
Further, describedly described data segment is carried out to central value weighted mean carry out broad sense simple crosscorrelation after level and smooth, the step that is obtained time delay by the coordinate figure of relevant peaks comprises the broad sense simple crosscorrelation Time Delay Estimation Algorithms that uses cepstral analysis, by asking the simple crosscorrelation between two paths of signals cepstrum, and give certain weighting at certain frequency domain, outstanding relevant signal section and suppress noise jamming part, then inverse transformation obtains cross correlation function to time domain, calculates the time delay between signal.
The present invention is carried out contactless detection sound source and is caused the Vibration Condition of diverse location by laser reflection, use multiple means to realize signals collecting and processing, demodulates sound source vibration signal, thereby determines position and the sound source play content of sound source.Compared to existing technology, described laser-Doppler speech monitoring method and device use the light intensity that weakens reference light matched signal light; Improve the contrast that two-beam is interfered, increase the transmission of the adjustable lens combination solution of focal length laser far-distance become greatly because the angle of divergence causes hot spot in detection light path, realizing detection brachium is even hundreds of rice of tens of rice; In circuit de-noising, use the shake of photoelectric sensor exploring laser light luminous power, reduce laser noise by difference channel, improve signal to noise ratio (S/N ratio), thereby arrive higher detection accuracy.
In addition, the present invention also has following beneficial effect:
1. reference light uses 1:9(reflection: transmission) spectroscope as catoptron, reach balanced reference light and survey the object of light light intensity, greatly improve the contrast of interference fringe, improve signal to noise ratio (S/N ratio), improve the measuring accuracy of system;
2. adopt diaphragm in frequency plane low-pass filtering, reduce laser light noise, prevent the interference of other light simultaneously, improve system signal noise ratio;
3. adopt the difference channel with gain adjustable amplifying circuit to reduce the interference of laser noise to system, further improve system signal noise ratio;
4. use virtual instrument concept and technology, the utilization of comprehensive high-speed dedicated data collecting card, Labview software programming, Matlab tool box special, realize the conversion of high-precision A/D, utilize many software Mixed-Programming Technology to realize powerful, signal processing function flexibly, meet Instrument Development trend and trend.
5. adopt lens combination focusing and the reversible former laser beam divergence that solves of light path to cause hot spot to become large problem, and utilize the relational implementation focus adjustment between lens combination focal length and lens distance, realize different detection range focus adjustment.
Brief description of the drawings
Fig. 1 is laser-Doppler frequency displacement interfere type audio monitoring device structure schematic diagram of the present invention;
Fig. 2 is the light channel structure schematic diagram in laser-Doppler frequency displacement interfere type audio monitoring equipment of the present invention one embodiment;
Fig. 3 is the structural representation of lens combination in Fig. 2.
Fig. 4 is the differential amplifier circuit of collection signal, and main circuit will be made up of the gain adjustable amplifying circuit with low-pass filtering and difference channel two parts;
Fig. 5 is the signal schematic representation that photoelectric sensor collects;
Fig. 6 is through differential amplifier circuit signal graph after treatment, contrast and can know with Fig. 5, after the signal that photoelectric sensor detects was processed through difference channel, the burr that in waveform, a large amount of laser noises causes is eliminated, and obtains a very level and smooth waveform.
Fig. 7 is the signal waveform comparison diagram before and after the filtering of labview program;
Fig. 8 is the schematic diagram figure that sound-reducing becomes voice signal;
Fig. 9 is the oscillogram that is reduced into the wav file of 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, the voice signal that wherein figure (a) two-way gathers, the waveform table after figure (b) simple crosscorrelation;
Figure 13 is Labview programming flowchart, through the signal of difference channel processing, adopt data collecting card to gather, call by the NI-DAQ module of Labview program the signal that 2 detectors amount to 2 passages, generate discrete signal, the control that re-uses Labview software the inside carries out filtering, voice recognition and auditory localization in conjunction with Matlab speech.
embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated; the present embodiment is implemented under taking technical solution of the present invention as prerequisite; provide detailed embodiment and concrete operating process; but protection scope of the present invention is not limited to following embodiment; concerning general technical staff of the technical field of the invention; do not departing under the prerequisite of this design, can also make some simple deduction or replace, all should belong to protection scope of the present invention.
Embodiment 1
The embodiment of the present invention provides a kind of laser-Doppler interfere type speech monitoring method, use the method for laser beat frequency to survey the windowpane slight vibration causing due to sound transmission to realize, from the signal of surveying, extract windowpane and vibrate the laser-Doppler beat frequency variation causing, signal is separated to mediation filtering processing, finally restore voice messaging.The method comprises:
Step S101: obtain reference light and measure the interference mixed frequency signal of light on photoelectric sensor;
Step S102: described interference mixed frequency signal is processed and obtained comprising and be proportional to the DC component of total light intensity and the M signal of sinusoidal pattern component, and the amplitude of described sinusoidal pattern signal is proportional to reference light and measures light intensity, comprises doppler phase in phase place;
Step S103: after described M signal and reference signal are subtracted each other, be reduced into voice signal.
Wherein, after described M signal and reference signal are subtracted each other, also comprise the step by signal being filtered with low-pass filtering gain adjustable amplifying circuit difference channel.The step of described restoring acoustical signal comprise to the signal after subtracting each other be normalized successively, inverse cosine function conversion and sample process.
In addition, embodiment of the present invention also provides a kind of audio monitoring equipment, comprise detector and the controller being connected with described detector, described detector comprises laser instrument and transmits the light path of the laser of described laser instrument transmitting, laser in described light path successively through the first catoptron, the second catoptron and spectroscope, laser is divided into reflected light and transmitted light by described light splitting piece, and described reflected light returns through spectroscope, enters photoelectric sensor through described light splitting piece; Described transmitted light focuses in target through lens combination.
Described lens combination is the adjustable lens combination of focal length, it comprises the first planoconvex lens, the second planoconvex lens and biconvex mirror that optical axis overlaps successively, described the first planoconvex lens and the second planoconvex lens arrange in opposite directions, and the distance between described the second planoconvex lens and described biconvex mirror is 15～17cm.The ratio of described spectroscopical reflectivity and transmissivity is 1:9, and the reflectivity of described light splitting piece and the ratio of transmissivity are 1:1.
Discuss in detail spirit of the present invention and essence below in conjunction with monitor method and equipment by an embodiment.
As shown in Figure 2 and Figure 8, in Fig. 2, taking Michelson interferometer structure as basic framework, measure optical axis parallel with direction of vibration.Laser beam is divided into two after by 1:1 light splitting piece M4 after spectroscope reflection and refraction; 1. reflected light (reference light) is through 1:9(R:T) spectroscope M3 reflection returns along original optical path after weakening 90%, see through the photosurface that 1:1 light splitting piece M4 reaches OPT101 photoelectric sensor 2,2. transmitted light (measurement light) focuses on glass pane front through compound lens, windowpane reflected light carries acoustic information and returns along original optical path, arrives the photosurface of OPT101 photoelectric sensor after the reflection of 1:1 spectroscope.Like this, reference light and measurement light are realized and are interfered mixing on the photosurface of OPT101 photoelectric sensor 2.
The flow process of laser monitor method is as follows:
The first step: give small vibration signal of windowpane, glass pane front vibration displacement x (t) and doppler phase
pass be
Second step: reference light and survey light and be radiated on OPT101 sensor simultaneously, because the Voltage-output of this sensor is directly proportional to incident light intensity, to square being directly proportional of the electric field of optics,, establish the reference light in t moment and the optical electric-field of detection light is here
Wherein f laser frequency,
with
initial phase,
glass pane front is vibrated the phase place causing and is changed.The output of detecting device be always proportional to total electric field square
The 3rd step: above formula is made to triangular transformation, because optical frequency is clapped signal much larger than optics, in detecting device output, can not clearly observe this frequency and therefore can omit, after arrangement:
The 4th step: OPT101 detector will detect two amounts simultaneously: one is proportional to the DC component of total light intensity, and another one is that amplitude is proportional to E
1e
2or
(I
1and I
2the intensity of two-beam), the sinusoidal pattern signal that comprises doppler phase in phase place, wherein doppler phase
determined by glass pane front vibration displacement x (t).
The 5th step: as shown in Figure 2, OPT101 sensor 1 will detect direct current light intensity and the optical noise of laser, and 2 of OPT101 sensors detect light signal and the optical noise of direct current light intensity, doppler phase cosine modulation.
The photosignal U1 that OPT101 photoelectric sensor 1 is exported is
U
1(t)＝a+bN(t)
The photosignal U2 that OPT101 photoelectric sensor 2 is exported is
A in formula, c is the DC component being caused by sensor and pre-amplification circuit; B, d is voltage gain;
for vibrating the doppler phase causing;
for the phase differential that optical path difference causes, N (t) is laser light noise.
In the time of regulation voltage gain multiple b=d, two above-mentioned formulas are subtracted each other,
Reach and suppress laser light noise effect, improve the object of collection signal signal to noise ratio (S/N ratio) and system sensitivity.
Designed main circuit will be by the gain adjustable amplifying circuit with low-pass filtering and difference channel two parts theory of constitution figure as shown in Figure 4.
Main circuit will adopt LM348 four high guaily unit chip, can change variable-resistance resistance and realize gain-adjusted, has adopted one-level RC low-pass filtering before its amplifying circuit, and its cutoff frequency is
Thereby this cutoff frequency had not only retained in vibration signal people's ear sensitive frequency but also can prevent from producing because gain is inconsistent in amplifying circuit the phase place difference that self-sustained oscillation causes.Experimental result shows, if there is the different phenomenon of phase place, its drawback is that the difference of the electric signal that makes two OPT101 photoelectric sensors outputs can not effectively suppress optical noise.Here the different phenomenon of phase place causing because of self-sustained oscillation by adopting one-level RC low-pass filtering to eliminate well before amplifying circuit, thus really reach the object that suppresses optical noise impact with difference channel, and effect is as shown in Figure 5, Figure 6.
The 6th step: in sound-reducing program, in Labview sound-reducing program, filtered signal is normalized, will
in DC component reject, then voltage boost coefficient is carried out obtaining after normalizing:
Above formula is carried out after inverse cosine function conversion to convolution
go forward side by side after line sampling and obtain:
Can obtain thus digital signal I (i), this signal and vibration signal are linear, can directly save as wav formatted file, and storage detection arrives to obtain voice signal.
Fig. 8 is the oscillogram of going back original sound wav file, and the oscillogram from figure can be found out, will produce an obvious signal wave bag when system detects character sound; Vibrational waveform while having sound and peace and quiet by contrast, finds that the sound-reducing signal to noise ratio (S/N ratio) of system is very high.
Laser-Doppler interfere type audio monitoring device of the present invention requires very low for the oscillation intensity of vibration source, the amplitude vibration that is only greater than 0.1um can detect; In addition, the BURN-THROUGH RANGE of detector can reach at most 20m.Table 1 is the key technical indexes parameter of this invention.
Embodiment 2
The embodiment of the present invention provides a kind of laser reflection sound source locating device, sound source is positioned by laser light path difference to realize, its positioning principle illustraton of model as shown in figure 10, adopt two detections to survey two different windowpanes, set up the model of auditory localization according to the optical path difference of sound transmission to two windowpane.
A kind of laser reflection sound localization method that the embodiment of the present invention provides, comprising:
Step S201: simultaneously obtain the first laser reflection signal and the second laser reflection signal;
Step S202: described the first laser reflection signal is carried out to maximal value detection, produce threshold value according to the maximal value detecting;
Step S203: according to described threshold value, Dui Gai road laser reflection signal carried out the detection of threshold value peak and obtains the first M signal;
Step S204: carry out interval division according to described the first M signal and the second laser signal, generate several data segments;
Step S205: described data segment is carried out to central value weighted mean and carry out broad sense simple crosscorrelation after level and smooth, obtain time delay by the coordinate figure of relevant peaks;
Step S206: the time delay that described data segment is produced is weighted and on average obtains deviation value;
Step S207: according to the positive and negative offset direction that obtains sound source of described deviation value, and according to the position offset of the numerical values recited calculating sound source of described deviation value.
Wherein, describedly described data segment is carried out to central value weighted mean carry out broad sense simple crosscorrelation after level and smooth, the step that is obtained time delay by the coordinate figure of relevant peaks comprises the broad sense simple crosscorrelation Time Delay Estimation Algorithms that uses cepstral analysis, by asking the simple crosscorrelation between two paths of signals cepstrum, and give certain weighting at certain frequency domain, outstanding relevant signal section and suppress noise jamming part, then inverse transformation obtains cross correlation function to time domain, calculates the time delay between signal
Below in conjunction with an embodiment, spirit of the present invention and essence are elaborated.
If the velocity of propagation of sound is V
s, the mistiming that sound passes to windowpane is τ, bias is A(with upwards partially for just), can obtain relational expression and be:
Solve and obtain bias A and be by these three formulas:
Auditory localization program as shown in figure 11, wherein first maximal value detection is carried out in a wherein road of the data that collect, produce a threshold value according to maximal value, Bing Duigai road signal carried out threshold value peak and detected, two groups of signals just centered by the coordinate of the peak value that obtains left and right divide by certain interval, generate several data segments.The each data segment generating carries out broad sense simple crosscorrelation after adopting central value weighted mean level and smooth, calculates time delay τ by the coordinate of relevant peaks.The time delay that all fragments are obtained is weighted on average, by its positive and negative offset direction that obtains sound source, according to its numerical values recited calculating location side-play amount.
Auditory localization program should consider that sound exists the situation of reverberation in room, therefore adopt the broad sense simple crosscorrelation Time Delay Estimation Algorithms with cepstral analysis, by asking the simple crosscorrelation between two paths of signals cepstrum, and give certain weighting at certain frequency domain, give prominence to relevant signal section and suppress noise jamming part, inverse transformation obtains cross correlation function to time domain again, calculates the time delay between signal, and cross correlation results figure as shown in figure 12.
Be the positioning experiment carrying out in calm quiet environment from Figure 12, peak value from the computing cross-correlation of the known auditory localization of Figure 12 (b) is very sharp steep, is disturbed lessly, and effect is very remarkable.
Should be appreciated that, the present invention is not limited to above-mentioned embodiment, every various changes of the present invention or modification are not departed to the spirit and scope of the present invention, if these are changed and within modification belongs to claim of the present invention and equivalent technologies scope, the present invention also means and comprises these changes and modification.
Claims (8)
1. a speech monitoring method, is characterized in that, comprising:
Obtain reference light and measure the interference mixed frequency signal of light on photoelectric sensor;
Described interference mixed frequency signal is processed and obtained comprising and be proportional to the DC component of total light intensity and the M signal of sinusoidal pattern component, and the amplitude of described sinusoidal pattern signal is proportional to reference light and measures light intensity, comprises doppler phase in phase place;
After described M signal and reference signal are subtracted each other, be reduced into voice signal.
2. a kind of speech monitoring method as claimed in claim 1, is characterized in that, after described M signal and reference signal are subtracted each other, also comprises the step by signal being carried out with low-pass filtering gain adjustable amplifying circuit and difference channel amplification filtering.
3. a kind of speech monitoring method as claimed in claim 1 or 2, is characterized in that, the step of described restoring acoustical signal comprise to the signal after subtracting each other be normalized successively, inverse cosine function conversion and sample process.
4. an audio monitoring equipment, it is characterized in that, comprise detector and the controller being connected with described detector, described detector comprises laser instrument and transmits the light path of the laser of described laser instrument transmitting, laser in described light path successively through the first catoptron, the second catoptron and light splitting piece, laser is divided into reflected light and transmitted light by described light splitting piece, and described reflected light returns through spectroscope, enters photoelectric sensor through described light splitting piece; Described transmitted light focuses in target through lens combination, and described target has can catoptrical function.
5. a kind of audio monitoring equipment as claimed in claim 4, it is characterized in that, described lens combination is the adjustable lens combination of focal length, it comprises the first planoconvex lens, the second planoconvex lens and biconvex mirror that optical axis overlaps successively, described the first planoconvex lens and the second planoconvex lens arrange in opposite directions, and the distance between described the second planoconvex lens and described biconvex mirror is 15～17cm.
6. a kind of audio monitoring equipment as claimed in claim 4, is characterized in that, the ratio of described spectroscopical reflectivity and transmissivity is 1:9, and the reflectivity of described light splitting piece and the ratio of transmissivity are 1:1.
7. a laser reflection sound localization method, is characterized in that, comprising:
Obtain the first laser reflection signal and the second laser reflection signal simultaneously;
Described the first laser reflection signal is carried out to maximal value detection, produce threshold value according to the maximal value detecting;
According to described threshold value, Dui Gai road laser reflection signal carried out the detection of threshold value peak and obtained the first M signal;
Carry out interval division according to described the first M signal and the second laser signal, generate several data segments;
Described data segment is carried out to central value weighted mean and carry out broad sense simple crosscorrelation after level and smooth, obtain time delay by the coordinate figure of relevant peaks;
The time delay that described data segment is produced is weighted and on average obtains deviation value;
According to the positive and negative offset direction that obtains sound source of described deviation value, and according to the position offset of the numerical values recited calculating sound source of described deviation value.
8. laser reflection sound source locating device as claimed in claim 7, it is characterized in that, describedly described data segment is carried out to central value weighted mean carry out broad sense simple crosscorrelation after level and smooth, the step that is obtained time delay by the coordinate figure of relevant peaks comprises the broad sense simple crosscorrelation Time Delay Estimation Algorithms that uses cepstral analysis, by asking the simple crosscorrelation between two paths of signals cepstrum, and give certain weighting at certain frequency domain, give prominence to relevant signal section and suppress noise jamming part, inverse transformation obtains cross correlation function to time domain again, calculates the time delay between signal.
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| CN201410078849.0A CN104036787B (en) | 2014-03-05 | 2014-03-05 | A kind of speech monitoring method and equipment, and laser reflection sound localization method |
| CN201610848216.2A CN106448703A (en) | 2014-03-05 | 2014-03-05 | Laser reflection sound source positioning method |
| CN201610848155.XA CN106448699A (en) | 2014-03-05 | 2014-03-05 | Voice audio monitor device |
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| CN201610848155.XA Division CN106448699A (en) | 2014-03-05 | 2014-03-05 | Voice audio monitor device |
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| CN201610848216.2A Pending CN106448703A (en) | 2014-03-05 | 2014-03-05 | Laser reflection sound source positioning method |
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| CN105699955A (en) * | 2014-12-09 | 2016-06-22 | 英特希尔美国公司 | Precision estimation for optical proximity detectors |
| CN110290468A (en) * | 2019-07-04 | 2019-09-27 | 英华达（上海）科技有限公司 | Virtual sound insulation communication means, device, system, electronic equipment, storage medium |
| US10818294B2 (en) | 2017-02-16 | 2020-10-27 | Magna Exteriors, Inc. | Voice activation using a laser listener |
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| CN110824579B (en) * | 2019-11-20 | 2021-05-25 | 中国电子科技集团公司第三十三研究所 | Anti-system tracking laser eavesdropping system and using method |
| CN114624652B (en) * | 2022-03-16 | 2022-09-30 | 浙江浙能技术研究院有限公司 | Sound source positioning method under strong multipath interference condition |
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| CN106448703A (en) | 2017-02-22 |
| CN104036787B (en) | 2017-12-01 |
| CN106448699A (en) | 2017-02-22 |
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