Apparatus for measuring S/N ratio of composite video signal
US6356302B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1998 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Oct 6, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N17/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An S/N ratio measuring method of a video signal which is suitable for the formation of an IC and can precisely detect a fluctuation of an S/N ratio of a video signal at high response speed while suppressing the total cost and a system based on this method. In operation, a composite video signal is received, a noise density in a predetermined period of the composite video signal is detected, and an S/N ratio of a video signal included in the composite video signal is recognized basis on the detected noise density. The S/N ratio measuring system has a demodulator for demodulating the composite video signal from the reception signal and a counter for counting noises which are generated in a predetermined period of time of the composite video signal and recognizes the S/N ratio of the video signal included in the composite video signal based on a count value obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.