Slow down color processor for video disc mastering using a special mode VTR
US4277796A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1979 |
| Grant date | Jul 7, 1981 |
| Priority date | — |
| Expiry date | Oct 22, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/85
- 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 at a lower clock rate that is inversely proportional to the number of times each field is repeated so as to produce a non-redundant video signal of reduced bandwidth. An audio signal is simultaneously reproduced from the tape at a rate less than that at which it was originally recorded and combined with the recovered video signal to produce a composite audio-video signal of reduced bandwidth possessing the full informational content of the original audio and video signals. The composite signal is suitable for application to the cutterhead of a video disc mastering lathe operating at reduced turntable speed whereby full bandwidth master recordings may be made with a cutterhead of lesser bandwidth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.