Combined phase shift filter network in a color video signal processing system employing dynamic flesh tone control
US4207590A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1979 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | Mar 14, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/643
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A combined phase shift and bandpass filter circuit in a color television receiver including color signal demodulators, and an automatic flesh tone correction network which provides a reference signal for the color demodulators, is disclosed. The circuit comprises an integral bandpass filter and phase shift network coupled between the output of the flesh tone correction network and the reference signal inputs of the demodulators. The circuit filters unwanted frequency components of the reference signal from the flesh correction network, and provides phase shifting of the reference signal as appropriate for proper operation of the demodulators. The circuit exhibits good phase stability, does not require alignment from receiver to receiver, and requires a minimum of connecting terminals to the flesh correction network and color demodulators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.