Slow down processor for video disc mastering having color phase error detector/corrector
US4376954A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1980 |
| Grant date | Mar 15, 1983 |
| Priority date | — |
| Expiry date | Dec 11, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/877
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Selected fields of a redundant field slow motion video tape reproduced video signal are stored in a memory at a given clock rate and recovered from the memory at a clock rate inversely proportional to the number of times each field is repeated so as to produce a non-redundant video output signal of reduced bandwidth yet processing the full informational content of the original video signal. The original signal normally exhibits an ordered color field sequence but is subject to anomalous variations from time to time which causes anomalous variation of the chrominance-burst phase relationship of the video output signal. A detector, responsive to a change of a parameter of the ordered sequence of the video input signal, supplies an enabling signal to an inverter circuit which inverts the phase of the burst component of the video output signal whereby the chrominance-burst phase relationship of each field of the video output signal remains unaltered in the presence of said anomalous variations of the ordered sequence of the video input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.