Optical communication of video and audio with cross-talk suppression
US4689826A · kind A · utility
2Cited by
3References
20Claims
0Family size
Inventor
Key dates
| Filing date | Sep 12, 1985 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | Sep 12, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/22
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A cross-talk suppression circuit is disclosed for use in an optical communications system which employs a light-emitting diode. A video signal and an audio-modulated carrier signal are both coupled to the light-emitting diode. A cross-talk reducing circuit is provided to couple the audio-modulated carrier signal to the light-emitting diode. The circuit comprises a voltage-controlled phase shifter for coupling the audio-modulated carrier signal to the light emitting diode, the phase shifter having a phase shift that is controlled by the video signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.