Synchronizing circuit for an external signal and an internal sam

Details Synchronizing circuit for an external signal and an internal sam Synchronizing circuit for an external signal and an internal sam

1988-04-21

1990-07-24

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358149, H04N 504

Patent

active

049438573

ABSTRACT:
A video signal and a horizontal synchronizing signal provided from a work station are delayed by a plurality of delay circuits having different delay amounts, and phase differences between a sampling clock signal and the delayed signals are detected. A clock generator generates two kinds of clock pulses having opposite phases and the same frequency. A clock selector selects one of the clock pulses as a sampling pulse signal in response to the phase differences. Further, a phase difference between the horizontal synchronizing signal and the video signal is detected so that the phase difference between the horizontal synchronizing signal and the video signal is maintained constant.

REFERENCES:
patent: 4617679 (1986-10-01), Brooks
patent: 4757264 (1988-07-01), Lee et al.

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