CN206099991U - Audio communication system based on laser - Google Patents
Audio communication system based on laser Download PDFInfo
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- CN206099991U CN206099991U CN201621049280.6U CN201621049280U CN206099991U CN 206099991 U CN206099991 U CN 206099991U CN 201621049280 U CN201621049280 U CN 201621049280U CN 206099991 U CN206099991 U CN 206099991U
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Abstract
The utility model provides an audio communication system based on laser, includes transmitting terminal laser modulation module and receiving terminal laser demodulation module, transmitting terminal laser modulation module includes triangle generator, voltage comparater LM311, clamp circuit and laser emitter, and voltage comparater LM311's the 7th foot is connected with clamp circuit, laser emitter respectively, and voltage comparater LM311's the 2nd foot and audio signal are connected, receiving terminal laser demodulation module includes photodiode D1, integrating circuit and audio power amplifier, and photodiode D1 passes through integrating circuit and is connected with audio power amplifier. The triangular wave that audio signal and triangle generator produced carries out analog signal conversion data signal PWM's modulation and launches the head through clamp circuit driving laser through voltage comparater LM311. Audio information accessible laser emitter launches from this. Receiving terminal laser demodulation module's photodiode D1 receives the laser signal, enlargies and drives the speaker sound production through audio power amplifier, realizes the transmit system of laser to sound.
Description
Technical field
This utility model is related to voice communication field, and in particular to a kind of audio communication system based on laser.
Background technology
As analogue audio frequency is present, transmission range is short, the shortcomings of be easily subject to extraneous electromagnetic interference, in voice communication skill
Begin to use Digital Audio Transmission mode in art, advantage is even more Laser Transmission exists so that its strong antijamming capability, signal bandwidth be big etc.
Audio area is widely used.
The content of the invention
The technical problems to be solved in the utility model is to provide a kind of compact conformation, it is possible to achieve transmission of the laser to sound
The audio communication system based on laser of function.
In order to solve above-mentioned technical problem, this utility model includes transmitting terminal Laser Modulation module and the demodulation of receiving terminal laser
Module, the transmitting terminal Laser Modulation module include that triangular-wave generator, voltage comparator LM311, clamp circuit and laser are sent out
Head is penetrated, the 7th foot of voltage comparator LM311 is connected with clamp circuit, laser beam emitting head respectively, the 2nd of voltage comparator LM311 the
Foot is connected with audio signal, and the 3rd foot of voltage comparator LM311 is connected with triangular-wave generator, the receiving terminal laser demodulation
Module includes photodiode D1, integrating circuit and audio-frequency power amplifier, and photodiode D1 passes through integrating circuit and audio frequency
Power amplifier connects.The triangular wave that audio signal and triangular-wave generator are produced is simulated by voltage comparator LM311
Signal converts the modulation of digital signal PWM, and the digital signal PWM for obtaining is through clamp circuit by high level stable in 5V, height electricity
The flat driving that can be used for laser beam emitting head.During high level, laser is lighted, and during low level, laser does not work.Thus audio-frequency information can pass through
Laser beam emitting head is launched.The sound frequency that human ear can be heard is between 20Hz--20kHz, so effectively audio signal
Highest frequency 20kHz.On the other hand, during applied voltage comparator LM311 modulated signals, the triangular wave sample frequency of input is necessary
The integrity that just can guarantee that signal higher than audio signal highest frequency, is to ensure sampling quality, and sample frequency is generally greater than former letter
The twice of number highest frequency.The photodiode D1 of receiving terminal laser demodulation module receives the laser letter that laser beam emitting head is launched
Number, because photodiode D1 can reduce impact of the light to signal quality in environment to a certain extent only to red light sensitiveness.
The signal that photodiode D1 is received and exported is still digital signal PWM, and digital signal PWM by integrating circuit decodable code is
Analogue signal, analogue signal are amplified by audio-frequency power amplifier and drive the speaker sounding, realize transmission of the laser to sound
Function, should be a kind of new communication modes based on the audio communication system of laser, can be rapidly performed by communication, directivity
By force, it is not easy to be intercepted, strong security.Suitable for the stronger field of some confidentiality, such as army's industry etc..Meet following communication
The trend of mode, with certain development potentiality and market value.
As further improvement of the utility model, the 1st foot of voltage comparator LM311 and the 4th foot ground connection, voltage ratio compared with
8th foot of device LM311 connects power supply.
Used as further improvement of the utility model, the triangular-wave generator includes 555 intervalometers, electric capacity C1, resistance
R1, resistance R2 and switching diode 1N914, the 1st foot ground connection of 555 intervalometers, the 4th foot of 555 intervalometers and the 8th foot connect electricity
Source, the 2nd foot of 555 intervalometers are connected with one end of the 3rd foot and electric capacity C1 of voltage comparator LM311 respectively, and electric capacity C1's is another
One end is grounded, and the 6th foot of 555 intervalometers is connected with the negative pole of switching diode 1N914, and one end of resistance R1 is fixed with 555 respectively
When the 7th foot of device, one end of resistance R2, the positive pole connection of switching diode 1N914, another termination power of resistance R1, resistance
The other end of R2 is connected with electric capacity C1.
Used as further improvement of the utility model, the clamp circuit includes resistance R3 and Zener diode D2, voltage
7th foot of comparator LM311 is connected with the negative pole of resistance R3, Zener diode D2 respectively, the plus earth of Zener diode D2,
One termination power of resistance R3.
Used as further improvement of the utility model, the integrating circuit is using RC series connection integrating circuit, RC series connection integrations
Circuit includes resistance R4 and electric capacity C2, and the audio-frequency power amplifier includes amplifier chip LM386, adjustable resistance VR1, electric capacity
C3, electric capacity C4, resistance R5 and speaker, the positive pole of photodiode D1 are connected with resistance R4, adjustable resistance VR1 respectively, photoelectricity
The minus earth of diode D1, the moving plate end of adjustable resistance VR1 are connected with the 3rd foot and electric capacity C2 of amplifier chip LM386 respectively
Connect, the 2nd foot of amplifier chip LM386, the 4th foot and the 7th foot are grounded, and the 6th foot of amplifier chip LM386 connects power supply, puts
Big device chip LM386 is in series with electric capacity C3, resistance R5 by its 5th pin, one end ground connection of resistance R5, amplifier chip
LM386 is in series with electric capacity C4, speaker by its 5th pin, one end ground connection of speaker.
Digital signal PWM is analogue signal by integrating circuit decodable code.Because digital signal PWM duty cycle is higher, institute
With the analog signal voltage that changes into as 3 to 4V.On the other hand, because digital signal PWM frequency is higher, do not use as far as possible
Multi-stage integral circuit, can reduce delay, it is ensured that signals revivification quality.In sum, integrating circuit selects RC series connection integrating circuit,
Analogue signal is obtained from electric capacity two ends.Integrating circuit time constant：T=RC, when realizing storage effect, source signal pulsewidth t1 should expire
Sufficient t>>t1.When resistance R4 select 100k Ω, electric capacity C2 from condition can be met during 0.01uf, while electric capacity C2 can serve as filter
Ripple electric capacity, filters the ripplet produced during integration so that the analogue signal that integration is obtained is smoothed, and eliminates partial noise.Obtain sound
Can be amplified by audio-frequency power amplifier after frequency signal, drive the speaker sounding.Amplifier chip LM386 gain factors scope is 20
To 200 times.Experiment is using 3W speakers.Audio frequency amplification effect is good.
In sum, the utility model has the advantages that compact conformation, it is possible to achieve transfer function of the laser to sound.
Description of the drawings
Come that the utility model is described in more detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the structural representation of transmitting terminal Laser Modulation module of the present utility model.
Fig. 2 is the structural representation of receiving terminal laser demodulation module of the present utility model.
Fig. 3 is signal waveform transition diagram of the present utility model.
Specific embodiment
By shown in Fig. 1 to Fig. 2, this utility model includes transmitting terminal Laser Modulation module and receiving terminal laser demodulation module,
The transmitting terminal Laser Modulation module includes triangular-wave generator, voltage comparator LM311, clamp circuit and laser beam emitting head,
The triangular-wave generator includes 555 intervalometers, electric capacity C1, resistance R1, resistance R2 and switching diode 1N914,555 intervalometers
The 1st foot ground connection, the 4th foot of 555 intervalometers and the 8th foot connect power supply, the 2nd foot of 555 intervalometers respectively with voltage comparator
One end connection of the 3rd foot and electric capacity C1 of LM311, the other end ground connection of electric capacity C1, the 6th foot and two poles of switch of 555 intervalometers
The negative pole connection of pipe 1N914, one end of resistance R1 the 7th foot respectively with 555 intervalometers, one end of resistance R2, switching diode
The positive pole connection of 1N914, another termination power of resistance R1, the other end of resistance R2 are connected with electric capacity C1, voltage comparator
7th foot of LM311 is connected with clamp circuit, laser beam emitting head respectively, and the clamp circuit includes resistance R3 and Zener diode
7th foot of D2, voltage comparator LM311 is connected with the negative pole of resistance R3, Zener diode D2 respectively, and Zener diode D2 is just
Pole is grounded, and a termination power of resistance R3, the 2nd foot of voltage comparator LM311 are connected with audio signal, voltage comparator
1st foot of LM311 and the 4th foot ground connection, the 8th foot of voltage comparator LM311 connect power supply, the receiving terminal laser demodulation module bag
Photodiode D1, integrating circuit and audio-frequency power amplifier are included, the integrating circuit is using RC series connection integrating circuit, RC series connection
Integrating circuit includes resistance R4 and electric capacity C2, the audio-frequency power amplifier include amplifier chip LM386, adjustable resistance VR1,
Electric capacity C3, electric capacity C4, resistance R5 and speaker, the positive pole of photodiode D1 are connected with resistance R4, adjustable resistance VR1 respectively,
The minus earth of photodiode D1, the moving plate end of adjustable resistance VR1 the 3rd foot and electric capacity respectively with amplifier chip LM386
C2 connects, and the 2nd foot of amplifier chip LM386, the 4th foot and the 7th foot are grounded, and the 6th foot of amplifier chip LM386 connects electricity
Source, amplifier chip LM386 are in series with electric capacity C3, resistance R5 by its 5th pin, one end ground connection of resistance R5, amplifier
Chip LM386 is in series with electric capacity C4, speaker by its 5th pin, one end ground connection of speaker.
The triangular wave that audio signal and triangular-wave generator are produced is simulated signal conversion by voltage comparator LM311
The modulation of digital signal PWM, with reference to Fig. 3, the digital signal PWM for obtaining is through clamp circuit by high level stable in 5V, height electricity
The flat driving that can be used for laser beam emitting head.During high level, laser is lighted, and during low level, laser does not work.Thus audio-frequency information can pass through
Laser beam emitting head is launched.The sound frequency that human ear can be heard is between 20Hz--20kHz, so effectively audio signal
Highest frequency 20kHz.On the other hand, during applied voltage comparator LM311 modulated signals, the triangular wave sample frequency of input is necessary
The integrity that just can guarantee that signal higher than audio signal highest frequency, is to ensure sampling quality, and sample frequency is generally greater than former letter
The twice of number highest frequency.The photodiode D1 of receiving terminal laser demodulation module receives the laser letter that laser beam emitting head is launched
Number, because photodiode D1 can reduce impact of the light to signal quality in environment to a certain extent only to red light sensitiveness.
The signal that photodiode D1 is received and exported is still digital signal PWM, and digital signal PWM by integrating circuit decodable code is
Analogue signal.Because digital signal PWM duty cycle is higher, the analog signal voltage for changing into is 3 to 4V.On the other hand,
Because digital signal PWM frequency is higher, does not use multi-stage integral circuit as far as possible, delay can be reduced, it is ensured that signals revivification matter
Amount.In sum, from RC series connection integrating circuit, analogue signal is obtained integrating circuit from electric capacity two ends.The integrating circuit time is normal
Number：T=RC, when realizing storage effect, source signal pulsewidth t1 should meet t>>t1.When resistance R1, R2 select 15 k Ω, resistance R3
From 240 Ω, resistance R4 selects 100k Ω, resistance R5 to select 10 Ω, electric capacity C1 to select 0.001uf, electric capacity C2 to select 0.01uf,
Electric capacity C3 selects 0.05uf, electric capacity C4 to select 250uf, can meet condition, while electric capacity when adjustable resistance VR1 is from 10 k Ω
C2 can serve as filter capacitor, filter the ripplet produced during integration so that the analogue signal that integration is obtained is smoothed, and cancellation part is made an uproar
Sound.Can be amplified by audio-frequency power amplifier after obtaining audio signal, drive the speaker sounding, realize transmission work(of the laser to sound
Energy.Amplifier chip LM386 gain factors scope is 20 to 200 times, and using 3W speakers, frequency amplification effect is good for experiment.Should
It is a kind of new communication modes based on the audio communication system of laser, communication can be rapidly performed by, high directivity is not easy to
It is intercepted, strong security.Suitable for the stronger field of some confidentiality, such as army's industry etc..Meet becoming for following communication modes
Gesture, with certain development potentiality and market value.
Claims (5)
1. a kind of audio communication system based on laser, including transmitting terminal Laser Modulation module and receiving terminal laser demodulation module,
It is characterized in that：The transmitting terminal Laser Modulation module include triangular-wave generator, voltage comparator LM311, clamp circuit and
Laser beam emitting head, the 7th foot of voltage comparator LM311 are connected with clamp circuit, laser beam emitting head respectively, voltage comparator
2nd foot of LM311 is connected with audio signal, and the 3rd foot of voltage comparator LM311 is connected with triangular-wave generator, the reception
End laser demodulation module includes photodiode D1, integrating circuit and audio-frequency power amplifier, and photodiode D1 is by integration
Circuit is connected with audio-frequency power amplifier.
2. the audio communication system based on laser as described in claim 1, it is characterised in that：The 1st of voltage comparator LM311
Foot and the 4th foot ground connection, the 8th foot of voltage comparator LM311 connect power supply.
3. the audio communication system based on laser as described in claim 1, it is characterised in that：The triangular-wave generator includes
555 intervalometers, electric capacity C1, resistance R1, resistance R2 and switching diode 1N914, the 1st foot ground connection of 555 intervalometers, 555 timings
4th foot of device and the 8th foot connect power supply, the 2nd foot of 555 intervalometers respectively with the 3rd foot and electric capacity C1 of voltage comparator LM311
One end connects, and the other end ground connection of electric capacity C1, the 6th foot of 555 intervalometers are connected with the negative pole of switching diode 1N914, resistance
One end of R1 the 7th foot respectively with 555 intervalometers, one end of resistance R2, the positive pole of switching diode 1N914 are connected, resistance R1
Another termination power, the other end of resistance R2 is connected with electric capacity C1.
4. the audio communication system based on laser as described in claim 2, it is characterised in that：The clamp circuit includes resistance
7th foot of R3 and Zener diode D2, voltage comparator LM311 is connected with the negative pole of resistance R3, Zener diode D2 respectively, surely
The plus earth of pressure diode D2, a termination power of resistance R3.
5. the audio communication system based on laser as described in claim 1, it is characterised in that：The integrating circuit is gone here and there using RC
Connection integrating circuit, RC series connection integrating circuit include resistance R4 and electric capacity C2, and the audio-frequency power amplifier includes amplifier chip
LM386, adjustable resistance VR1, electric capacity C3, electric capacity C4, resistance R5 and speaker, the positive pole of photodiode D1 respectively with resistance
R4, adjustable resistance VR1 connect, the minus earth of photodiode D1, the moving plate end of adjustable resistance VR1 respectively with amplifier chip
3rd foot of LM386 and electric capacity C2 connections, the 2nd foot of amplifier chip LM386, the 4th foot and the 7th foot are grounded, amplifier chip
6th foot of LM386 connects power supply, and amplifier chip LM386 is in series with electric capacity C3, resistance R5 by its 5th pin, resistance R5's
One end is grounded, and amplifier chip LM386 is in series with electric capacity C4, speaker by its 5th pin, one end ground connection of speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621049280.6U CN206099991U (en) | 2016-09-12 | 2016-09-12 | Audio communication system based on laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621049280.6U CN206099991U (en) | 2016-09-12 | 2016-09-12 | Audio communication system based on laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206099991U true CN206099991U (en) | 2017-04-12 |
Family
ID=58475210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621049280.6U Expired - Fee Related CN206099991U (en) | 2016-09-12 | 2016-09-12 | Audio communication system based on laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206099991U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422645A (en) * | 2021-07-30 | 2021-09-21 | 吉林大学 | Pulse width modulation system and method |
-
2016
- 2016-09-12 CN CN201621049280.6U patent/CN206099991U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422645A (en) * | 2021-07-30 | 2021-09-21 | 吉林大学 | Pulse width modulation system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170412 Termination date: 20170912 |