Television signal determination in an automatic tuning system
US4205347A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1978 |
| Grant date | May 27, 1980 |
| Priority date | — |
| Expiry date | Apr 26, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J7/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A television signal determination circuit is associated with an automatic tuning system, which automatically tunes a television set to local channels, in order to determine whether received signals are desired television signals. The television signal determination circuit comprises a first counter means for counting received synchronizing signals for a predetermined period of time, a second counter means for counting reference clock signals for the predetermined period of time, and a determination means for determining whether the synchronizing signals are received by a predetermined number within the predetermined period of time by comparing output signals from the first and second counter means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.