Color signal processing circuit in color VTR

Details Color signal processing circuit in color VTR Color signal processing circuit in color VTR

1994-08-08

1997-04-15

Tran, Thai Q.

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

H04N 989

Patent

active

056215371

ABSTRACT:
In a home VTR, a color signal processing circuit is capable of reproducing a color signal recorded as a lower converted color signal and preventing color unevenness which necessarily creates during visualizing. To avoid an adverse effect due to phase fluctuation created during reproducing, the color signal processing circuit is provided with a circuit for synchronizing a carrier with the phase fluctuation. In this circuit, an open loop circuit is connected to a closed loop circuit to achieve such synchronization. Specifically, the phase fluctuation in a low-frequency range is synchronized by a feedback feature of the closed loop circuit, while the phase fluctuation in a high-frequency range is synchronized by a detecting feature of the closed loop circuit.

REFERENCES:
patent: 3629491 (1971-12-01), Dann
patent: 3704341 (1972-11-01), Fujita
patent: 4554596 (1985-11-01), Shibata et al.
patent: 4635097 (1987-01-01), Tatami
patent: 4807048 (1989-02-01), Yasuda
patent: 4956720 (1990-09-01), Tomisawa
patent: 4991026 (1991-02-01), Takase et al.
patent: 5083197 (1992-01-01), Ko et al.
patent: 5083213 (1992-01-01), Yasuda
"NHK Home Video Technology" Nippon Hoso Kyokai, Apr. 20, 1980.

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