Decoder-operated television signal switch
US4941048A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1988 |
| Grant date | Jul 10, 1990 |
| Priority date | — |
| Expiry date | Dec 14, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/104
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An enclosure, including an automatic television signal switch, has four coaxial cable connectors, a first for bringing in an input television signal, a second and a third for supplying signals to and from a decoder, and a fourth for supplying television signals to a television receiver. A signal splitter is connected to the first connector and supplies one television signal to a decoder via the second connector and another television signal to a first stationary contact of a relay. The second relay stationary contact is connected to the third connector which receives decoded signals from the decoder. The movable contact of the relay is connected to the fourth connector. The relay is powered by an internal DC power supply that is connected via a line cord and plug to a switched AC power outlet on the decoder. Turning the decoder on automatically energizes the relay to pass input the television signal to the decoder. When the decoder is off, the relay bypasses the decoder and passes input television signals directly to the television receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.