Muting circuit for a television receiver
US4280139A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1979 |
| Grant date | Jul 21, 1981 |
| Priority date | — |
| Expiry date | Oct 10, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/505
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A muting circuit for a television receiver of the type having a tuner which is operative to select a desired channel in accordance with a channel selection operation to produce a channel select signal representing the selected channel, a detector circuit for detecting whether a video signal is present or not, a muting signal generator circuit supplied with an output from the detector circuit and the channel select signal representing the selection of a predetermined channel to produce a muting signal when the predetermined channel is selected but no output is produced by the detector circuit, and a muting circuit coupled to a low frequency signal transmission path in response to the muting signal from the muting signal generator circuit to cut off or attenuate the transmission of a low frequency signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.