CN2582300Y - Semi-conductor laser audio frequency modulation device - Google Patents
Semi-conductor laser audio frequency modulation device Download PDFInfo
- Publication number
- CN2582300Y CN2582300Y CN 02260675 CN02260675U CN2582300Y CN 2582300 Y CN2582300 Y CN 2582300Y CN 02260675 CN02260675 CN 02260675 CN 02260675 U CN02260675 U CN 02260675U CN 2582300 Y CN2582300 Y CN 2582300Y
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- China
- Prior art keywords
- semiconductor laser
- power tube
- receiver
- output
- audio
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- Expired - Fee Related
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Abstract
The utility model relates to a semiconductor laser audio-frequency modulating device used for short-distance wireless communication, which is composed of an emitter and a receiver, wherein, the emitter is composed of an audio generator, a not-gate circuit, a power pipe and an invisible-light semiconductor laser, and the receiver comprises a photoelectric receiver, a preamplifier, an emitter follower, an amplifier, a power amplifying pipe and an earphone. During being tried out in the short-distance communication, the utility model has the advantages of better effect, good concealing property, high sound articulation, small volume and high confidentiality.
Description
Technical field
The utility model relates to a kind of semiconductor laser voice modulation device that is used for wireless near field communication.
Background technology
At present, in in-plant radio communication, generally use intercom, its model of communication system is: information source → modulator → carrier wave → transmission → demodulator → receiver, ZAP and modulation technique more complicated, and divulge a secret easily, noise is big, sound articulation is poor.Privacy problem in the communication is most important in military affairs, and communication security seems more and more important in striving day by day fierce economic society unexpectedly, and secret in the communication becomes one of key technology in the modern communications, and intercom can not address this problem.
Summary of the invention
The purpose of this utility model is the shortcoming that exists in the existing intercom in order to overcome, and provides that a kind of good concealment, sound articulation height, volume are little, the semiconductor laser voice modulation device of strong security.
The technical solution of the utility model is: it is made up of voice modulation optical transmitting set and voice modulation optical receiver; Reflector is made up of the semiconductor laser of audio-frequency generator, NAND gate circuit, power tube and invisible light, the audio signal output of audio-frequency generator is connected with NAND gate circuit after capacitive coupling, the output of NAND gate circuit connects power tube after capacitive coupling, the collector electrode output of power tube is connected with semiconductor laser tube; Receiver comprises photelectric receiver, preamplifier, emitter follower, amplifier, power tube and earphone; The output of photelectric receiver is connected with preamplifier after filtering, be connected with between preamplifier and the back one-level amplifier and use and organize anti-coupling and prevent self-oscillatory emitter follower, the output of back one-level amplifier connects power tube after capacitive coupling, the earphone of listening to sound is connected between the collector electrode of power supply and power tube.
Operation principle of the present utility model is done following description: the audio signal of audio-frequency generator is through being added on the base stage of power tube after the filtering with after the NAND gate circuit, when base potential is higher than emitter, the power tube conducting, collector potential descends, and semiconductor laser tube is ended.When base potential was lower than emitter, power tube ended, and collector potential makes the semiconductor laser tube conducting near supply voltage at this moment, sends laser.Semiconductor laser tube is luminous and not luminous along with the audio signal potential change like this, and the laser that sends of semiconductor laser tube is subjected to the modulation of audio signal like this, promptly is audio signal to be added to semiconductor laser got on.When the illumination that is subjected to the audio signal modulation is mapped on the photelectric receiver PN pipe, the anodal current potential of PN pipe is changed, make light signal convert the signal of telecommunication to, this signal is audio signal, promptly is to obtain demodulation.Preamplifier by first order field effect transistor amplifies audio signal, carry out impedance matching through the one-level emitter follower again, prevent to produce self-oscillation, amplify through one-level again, make signal stabilization, amplitude increases, thereby drives the sound of the audio frequency that produces on the earphone between the collector electrode that is connected on power supply and power tube.
The utility model effect in short haul connection on probation is better, good concealment, sound articulation height, little, the strong security of volume.
Description of drawings
Fig. 1 is a voice modulation optical transmitting set schematic circuit;
Fig. 2 is a voice modulation optical receiver schematic circuit.
Shown in Fig. 1,2, voice modulation optical transmitting set and voice modulation optical receiver are formed; Reflector is by audio-frequency generator (1), NAND gate circuit (2), power tube T
1(3) and the semiconductor laser (4) that can send out infrared light form, the audio signal output of audio-frequency generator is through capacitor C
1The coupling back is connected with NAND gate circuit (2), and the output of NAND gate circuit is through capacitor C
2The coupling back connects power tube T
1(3), the output of the collector electrode of power tube is connected with semiconductor laser tube (4), and semiconductor laser (4) is selected the infrared light semiconductor laser of 780 mum wavelengths.Receiver comprises photelectric receiver (5), preamplifier (6), emitter follower (7), amplifier (8), power tube T
2(9) and earphone (10); The output of photelectric receiver PN pipe is through R
4C
3Preamplifier with field effect transistor 3DJ6Q after the filtering is connected, and is connected with one-level between preamplifier and the back one-level amplifier module and penetrates a grade follower, prevents self-oscillation to play the impedance matching effect, and the output of back one-level amplifier is through capacitor C
5The coupling back connects power tube T
2(9), the earphone (10) of listening to sound is connected between the collector electrode of power supply and power tube.
Claims (1)
1, semiconductor laser voice modulation device is characterized in that, it is made up of voice modulation optical transmitting set and voice modulation optical receiver; Reflector is by audio-frequency generator (1), NAND gate circuit (2), power tube T
1(3) and invisible light semiconductor laser (4) form, the audio signal output of audio-frequency generator is connected with NAND gate circuit (2) after capacitive coupling, the output of NAND gate circuit connects power tube T after capacitive coupling
1(3), the output of the collector electrode of power tube is connected with semiconductor laser tube (4); Receiver comprises photelectric receiver (5), preamplifier (6), emitter follower (7), amplifier (8), power tube T
2(9) and earphone (10); The output of photelectric receiver (5) is connected with preamplifier (6) after filtering, is connected with one-level emitter follower (7) between preamplifier (6) and the back one-level amplifier (8), and the output of back one-level amplifier (8) connects power tube T after capacitive coupling
2(9), the earphone (10) of listening to sound is connected between the collector electrode of power supply and power tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02260675 CN2582300Y (en) | 2002-10-15 | 2002-10-15 | Semi-conductor laser audio frequency modulation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02260675 CN2582300Y (en) | 2002-10-15 | 2002-10-15 | Semi-conductor laser audio frequency modulation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2582300Y true CN2582300Y (en) | 2003-10-22 |
Family
ID=33727671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02260675 Expired - Fee Related CN2582300Y (en) | 2002-10-15 | 2002-10-15 | Semi-conductor laser audio frequency modulation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2582300Y (en) |
-
2002
- 2002-10-15 CN CN 02260675 patent/CN2582300Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |