Playback color processing circuit
US5032902A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1989 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Jul 5, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/7917
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A playback color processing circuit for a video tape recorder includes an automatic phase control loop and has two comb filters. A first comb filter. A contains a single 1H delay line for canceling adjacent-track crosstalk in the automatic phase control loop. Further, a second comb filter contains two 1H delay lines for canceling adjacent-track crosstalk in the chrominance output signal. Due to the short H/2 group delay time of the first comb filter, the chrominance output of this circuit possesses excellent phase stability and is free of hue irregularities. Due to the superior spurious output characteristics of the second comb filter, the chrominance output has good vertical resolution and can create a color picture free of vertical color smear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.