Method and apparatus for testing video
US5247350A · kind A · utility
3Cited by
3References
8Claims
0Family size
Inventors
Key dates
| Filing date | Jan 9, 1992 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | Jan 9, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/84
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The chroma circuits of a VCR are tested by replacing the video signal from the video heads of the VCR with a composite signal from a test pattern signal developed by a test instrument, which composite signal includes a chroma signal which is phase rotated in response to a chroma reference signal from the VCR. The chroma reference signal from the VCR is used to control the chroma signal in the composite test pattern signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.