Video signal switching circuit especially suitable for high definition television receiving
US5153724A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 6, 1990 |
| Grant date | Oct 6, 1992 |
| Priority date | — |
| Expiry date | Aug 6, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/44
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides an apparatus which receives and displays a high definition television signal and which is constructed so that noise and/or a deformed picture may not be displayed even when an input signal instead of a high definition television signal is applied or when transmission of such a high definition television signal is interrupted. In the apparatus, on the basis of whether or not a frame signal in an input high definition television signal can be detected, a first signal indicating synchronization lock or a second signal indicating synchronization unlock is generated so that, when the first signal is detected, the output of a signal processing circuit (110) is selected to display the high definition television signal, while when the second signal is detected, the output of a pattern generation circuit (114) is selected to prevent display of noise etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.