CN2579110Y - Photoelectrical coupling audio-video frequency distributor - Google Patents
Photoelectrical coupling audio-video frequency distributor Download PDFInfo
- Publication number
- CN2579110Y CN2579110Y CN02285245U CN02285245U CN2579110Y CN 2579110 Y CN2579110 Y CN 2579110Y CN 02285245 U CN02285245 U CN 02285245U CN 02285245 U CN02285245 U CN 02285245U CN 2579110 Y CN2579110 Y CN 2579110Y
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- video
- photoelectrical coupler
- power supply
- audio
- stage
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- Expired - Fee Related
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- 230000008878 coupling Effects 0.000 title claims abstract description 6
- 238000010168 coupling process Methods 0.000 title claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Abstract
The utility model relates to a photoelectrical coupling audio-video frequency distributor which can eliminate 50Hz ground loop interference, and a front-stage circuit is completely isolated from a back-stage circuit on electric appliance parameters. A front-stage isolator of the utility model uses one independent power source for supplying power, a back-stage amplifier uses the other independent power source for supplying power, and signals between the front stage and the back stage are coupled by a photoelectric coupler.
Description
Affiliated technical field
The utility model relates to a kind of audio frequency and video distributor, relate to the device that utilizes photoelectrical coupler transmission sound, video wire size that a kind of radio data system uses more precisely, especially can thoroughly eliminate the audio frequency and video distributor of ground loop 50HZ interference and other noise jamming.
Background technology
The audio frequency and video distributor of radio and television department use at present, all be gain be 1 and and the audio frequency and video distributor of miscellaneous equipment " altogether ", this distributor is with after miscellaneous equipment is connected, because the residing distance of various device is different, the place difference, can produce various electromagnetic interference and the interference of 50HZ ground loop, cause the broadcast television signal signal to noise ratio seriously to descend, it is very difficult to want to eliminate this interference fully.
Summary of the invention
Can not thoroughly eliminate the deficiency that the ground loop disturbs in order to overcome existing audio frequency and video distributor, the utility model provides a kind of audio frequency and video distributor, this distributor can not only play the effect of existing distributor, and can thoroughly eliminate the ground loop and disturb, and improves the signal to noise ratio of audio-video signal.
The technical scheme that its technical problem that solves the utility model adopts is: preceding quality audio and video isolator adopts an independent current source, another independent current source that post-amplifier adopts and prime is isolated fully, the signal of prime passes through photoelectrical coupler, is electrical signal conversion that light signal passes to post-amplifier, post-amplifier is isolated on electric parameter fully before making, because the insulation resistance between the level of front and back is infinitely great, so the equipment of level is by the leakage current of ground wire and other lead before and after thoroughly eliminating, therefore, can thoroughly eliminate the ground loop disturbs.
The beneficial effects of the utility model are that audio/video signal transmission can make prime and back level electronic equipment isolate fully on electric property again normally, can eliminate the ground loop completely and disturb.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Accompanying drawing is an electrical schematic diagram of the present utility model.
Embodiment
The collector electrode of L1, R6, VT2 in the accompanying drawings, the positive pole of the positive pole of C4 and power supply V1 joins; 2 pin of the termination photoelectrical coupler U1 of R3, the negative pole of another termination power V1; 1 pin of photoelectrical coupler U1 and the emitter of VT1 join, and 4,5 pin of U1 are connected through the positive pole of R4 and power supply V2, and 3 pin of U1 and the negative pole of V2 are connected; The end of R8 is connected with the negative pole of power supply V2, and 2 pin of the other end and photoelectrical coupler U2 are connected; 1 pin of the emitter of VT2 and photoelectrical coupler U2 is connected, and 4,5 pin of U2 are connected through the positive pole of R9 and power supply V2, and 3 pin of U2 and the negative pole of V2 are connected.
Claims (3)
1. optical coupling audio frequency and video distributor, the audio or video amplifier of preceding quality audio and video isolator and back level, use two groups of fully independently power supply power supplies respectively, signal is coupled by photoelectrical coupler, it is characterized in that: the load of preceding quality audio and video isolator is the light-emitting diode in the photoelectrical coupler, and the signal of post-amplifier derives from the phototriode in the photoelectrical coupler.
2. optical coupling audio frequency and video distributor according to claim 1 is characterized in that: 1 pin of photoelectrical coupler is connected with the output of prime isolator, and 4,5 pin of photoelectrical coupler are connected through the positive pole of resistance and power supply V2, and 3 pin are connected with the negative pole of power supply V2.
3. optical coupling audio frequency and video distributor according to claim 1 is characterized in that: preceding quality audio and video isolator adopts one group of power supply V1, and post-amplifier adopts another group power supply V2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02285245U CN2579110Y (en) | 2002-11-12 | 2002-11-12 | Photoelectrical coupling audio-video frequency distributor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02285245U CN2579110Y (en) | 2002-11-12 | 2002-11-12 | Photoelectrical coupling audio-video frequency distributor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2579110Y true CN2579110Y (en) | 2003-10-08 |
Family
ID=33746320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02285245U Expired - Fee Related CN2579110Y (en) | 2002-11-12 | 2002-11-12 | Photoelectrical coupling audio-video frequency distributor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2579110Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105959602A (en) * | 2016-07-04 | 2016-09-21 | 南通同洲电子有限责任公司 | TV protection board adopting audio and video photoelectric coupling isolation circuit |
-
2002
- 2002-11-12 CN CN02285245U patent/CN2579110Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105959602A (en) * | 2016-07-04 | 2016-09-21 | 南通同洲电子有限责任公司 | TV protection board adopting audio and video photoelectric coupling isolation circuit |
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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 |