Color video signal recording and reproducing apparatus providing preferential dropout compensation and time base error correction
US4051515A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1976 |
| Grant date | Sep 27, 1977 |
| Priority date | — |
| Expiry date | Apr 15, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/82
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention departs from conventional concepts, involving the use of magnetic tape or the like, of color video signal recording by providing video signal recording and reproducing apparatus in which preferential dropout compensation is obtained without the use of special dropout compensation circuitry. A color video signal is down-converted in frequency to produce a video signal of a recordable frequency range with picture information at relatively low frequencies and color and sound information at relatively higher frequencies, respectively. Dropouts, therefore, affect the sound information first, the color information second, and the picture information last, as is preferable. In accordance with another aspect of the invention, time base error correction is obtained without the use of time base error correction circuitry by separating the luminance and chrominance signals and so down-converting each signal to a recordable frequency range that the luminance carrier and the chrominance carrier have the same frequency. Upon recording and playing back, time base variations, as may be caused by tape flutter, will then affect both carriers equally. After up-converting and rec…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.