Ghost cancelling circuit having filter controlled by variable limiter
US5138453A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1991 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Jun 10, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/211
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for detecting a wave distortion in a circuit for eliminating a ghost wave component, wherein a received video signal is applied to a transversal filter, a reference signal for cancelling a ghost signal (GCR signal) is taken out from an output signal from the transversal filter, a ghost wave component is picked up from the GCR signal, a signal for controlling a transmission characteristic of the transversal filter is formed on the basis of the picked-up ghost wave component, and the control signal is applied to the transversal filter to thereby extract from the filter a video signal from which the ghost wave component is cancelled. This circuit includes a variable limiter provided on a signal line for transmitting the control signal to the transversal filter and an unit for controlling a limiter level of the variable limiter to be decreased with time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.