Track judgement apparatus for discriminating between video and other signals during signal reproduction
US5579123A · kind A · utility
6Cited by
10References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 15, 1994 |
| Grant date | Nov 26, 1996 |
| Priority date | — |
| Expiry date | Mar 15, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3264
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a system for reproducing signals which may be video or audio, the reproduced signal is judged to be an audio signal if signals corresponding to sync signals occur at a rate frequency greater than once per field interval. In one embodiment, the track judgment system counts the output signals generated from a signal separating circuit during reproduction. The track judgment system also monitors the output of a pulse generator (PG) detector during reproduction. The outputs from the signal separating circuit and the PG detector are logically evaluated to determine the type of signal being reproduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.