Color recorder having means for reducing luminance crosstalk in displayed image
US4134126A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 1977 |
| Grant date | Jan 9, 1979 |
| Priority date | — |
| Expiry date | Jul 12, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/923
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of and apparatus for recording a video signal in successive parallel tracks on a record medium, and for reproducing the recorded signal. The video signal, which may be the luminance component of a composite color television signal, frequency modulates a carrier to produce a frequency modulated video signal. The phase of the frequency modulated video signal is selectively shifted in selected line intervals and is recorded in parallel tracks such that the phase difference between frequency modulated video signals in at least some adjacently recorded line intervals of successive tracks is an odd multiple of .pi.. In one embodiment, the difference between the phase of alternate line intervals which are recorded in one track and the phase of alternate line intervals which are recorded in the next adjacent track is equal to an odd multiple of .pi.. In accordance with another embodiment, the difference between the phases of successive line intervals which are recorded in the same track is equal to an odd multiple of .pi.. The phase shift is attained by inserting a pulse signal into selected line intervals of the video signal in advance of the frequency modulation. During reproduc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.