Stable low cost 4.5 MHz remodulator
US4633316A · kind A · utility
10Cited by
35References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1984 |
| Grant date | Dec 30, 1986 |
| Priority date | — |
| Expiry date | Nov 14, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A cable converter produces a 4.5 MHz intercarrier sound signal from a received television signal for application to one input of a phase lock loop circuit, the other input of which is supplied from a voltage controlled oscillator producing a regenerated 4.5 MHz intercarrier signal. The output of the phase lock loop is supplied through a loop filter to the input of the voltage controlled oscillator to control its frequency. The regenerated 4.5 MHz intercarrier signal is thus stabilized by the received 4.5 MHz intercarrier signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.