Video signal synchronizer for a video signal in luminance and chrominance component form
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United States of America Patent
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Sep 14, 1993
Grant Date -
N/A
app pub date -
Jan 30, 1990
filing date -
Feb 10, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Video signals are supplied as component signals (in which the color signals are not correlated with a color carrier wave) and are stored in a frame memory and read out therefrom in synchronism with supplied reference signals. A FIFO memory is interposed ahead of the frame memory for delaying the video signals in such a way that they can be brought into synchronism with the horizontal phase of the reference signals. The system can be made to operate in a frame mode in which the field sequence and the timing of the synchronizing pulses always agree with those of the reference signal, in a field mode in which only horizontal sychronization is provided and the field sequence can be modified, a line mode in which the input signal is merely delayed into synchronism with the horizontal phase of the reference signal, and a delay mode in which a substitute reference signal is derived from the input signal itself, so that the memory is used merely for delay.
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