Video processing system having improved synchronization

Details Video processing system having improved synchronization Video processing system having improved synchronization

1991-03-28

1992-12-08

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 944

Patent

active

051702460

ABSTRACT:
A video processing apparatus receives an analog color composite video signal, which has a color burst and generates a D2 digital signal sampled at a certain phase relationship with the color burst by a sampling clock. The analog video signal is phase shifted to produce a "zero" video signal. The analog video signal and the phase shifted video signal are added together to produce a sum video signal. The sum video signal is clocked into a latch by the sampling clock signal. The output of the latch is delayed by two clock pulses to produce a delay clocked video signal. The delay clocked video signal is compared with the output of the latch to produce a comparing signal. The comparing signal is used to adjust the phase of the sampling clock signal to automatically control the phase relationship between the analog video signal and the sampled digital signal.

REFERENCES:
patent: 4214260 (1980-07-01), Van Straaten
patent: 4400720 (1983-08-01), Hinn
patent: 4853796 (1989-08-01), Suesada
patent: 4930003 (1990-05-01), Hosoya

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