Synchronous signal separation circuit
US5805150A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1995 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Sep 22, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/68
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A synchronous signal separation circuit is disclosed which separates and fetches a synchronous signal from a video signal to which the synchronous signal has been added. The synchronous signal separation circuit includes an amplifier for amplifying a voltage of the video signal to output an amplified signal having an amplified voltage which is within a predetermined dynamic range. A voltage generator outputs a variable offset voltage to the amplifier for shifting a reference level of the amplified voltage to a predetermined level. A synchronous signal fetch means which, by comparing the amplified video signal with a threshold voltage in which the variable offset voltage has been adjusted based on the degree of amplification of the amplifier, fetches only the synchronous signal from the video signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.