Reference signal generator

Details Reference signal generator Reference signal generator

1985-10-21

1987-06-30

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358337, 358320, 358 17, H04N 9475

Patent

active

046774599

ABSTRACT:
A reference signal generator used to compensate for a time base error of a color video signal reproduced from a video tape recorder having a memory into which the color video signals are written in response to a write clock and from which the color video signals are read in response to a read clock and a read start pulse, comprises a color frame detector adapted to detect a color framing condition from a reference sync. (synchronizing) signal and a reference burst signal and to generate a color framing indicating signal. Also included are first phase controller for controlling a phase of chrominance subcarrier signal in response to a subcarrier phase control signal, the chrominance subcarrier signal being phase-locked with the reference burst signal, a second phase controller for controlling a phase of the reference sync. signal in response to a sync. phase control signal and the subcarrier phase control signal, and a read-start signal generator circuit responsive to the color framing indicating signal, the phase-controlled chrominance subcarrier signal and the phase-controlled reference sync. signal for generating the read start pulse to be supplied to the memory of the video tape recorder.

REFERENCES:
patent: 4119999 (1978-10-01), Gallo
patent: 4257830 (1981-02-01), Tanami
patent: 4339770 (1982-07-01), Dennison et al.
patent: 4373168 (1983-02-01), Mizukami et al.
patent: 4438456 (1984-03-01), Yoshinaka
patent: 4562457 (1985-12-01), Salvia

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