Automatic phase control color signal circuit for video tape reco

Details Automatic phase control color signal circuit for video tape reco Automatic phase control color signal circuit for video tape reco

1983-03-31

1986-08-19

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 11, 358 21R, 358140, H04N 5782

Patent

active

046072926

ABSTRACT:
A color signal processing circuit in a video tape recorder for recording a low frequency converted color signal has a voltage controlled oscillator for generating a carrier having a center frequency which is M times as high as a low-frequency sub-carrier frequency, where M is an integer, and a detection circuit for detecting a variation of the oscillation frequency of the voltage controlled oscillator in at least a reproduction mode. A suppression circuit suppresses the change of the oscillation frequency of the voltage controlled oscillator in response to the output signal from the detection means and a control circuit changes the center oscillation frequency of the voltage controlled oscillator depending on whether the signal is processed in the NTSC system or the PAL system in such a way that the suppression range for the change of the oscillation frequency of the voltage controlled oscillator by the suppression for the NTSC system is equal to or wider than that for the PAL system. The control circuit includes a pulse-eliminating frequency divider or a variable frequency division factor.

REFERENCES:
patent: 4010490 (1977-03-01), Ota
Nakagawa et al, "New Chrominance Signal Processing LSI For Home VCR", Hitachi, Ltd., Tokyo, Japan, pp. 1-8.

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