Reference signal generator

Details Reference signal generator Reference signal generator

H - Electricity

04

N

352/18.31

H04N 9/89 (2006.01) H04N 9/896 (2006.01)

Patent

CA 1250660

ABSTRACT OF THE DISCLOSURE 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 a first phase controller for controlling a phase of chrominance sub- carrier 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 indicat- ing 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.

493478

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