Video signal recording and/or reproducing apparatus
US4165518A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1977 |
| Grant date | Aug 21, 1979 |
| Priority date | — |
| Expiry date | Feb 18, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/92
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In apparatus for recording and/or reproducing video signals in successive parallel tracks on a record medium, and in which at least a portion of the video signals, for example, the luminance component of color video signals, is recorded as a frequency modulation on a carrier, the carrier of the frequency modulated portion of the video signals, as recorded in tracks that are next adjacent to each other, has different first and second carrier frequencies, respectively, which are in frequency interleaving relation to each other for minimizing cross-talk when reproducing the signals thus recorded. The shifting of the carrier frequency for the frequency modulated luminance component is conveniently achieved by selectively applying different first and second bias voltages to the luminance component as supplied to a frequency modulator, with the difference between such bias voltages being effective in the modulator to establish the desired difference between the carrier frequencies. On reproducing, the frequency modulated luminance component is demodulated, and changes in level of the demodulated luminance component corresponding to the different carrier frequencies with which the frequen…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.