Interface circuit of video signal hard copy apparatus

Details Interface circuit of video signal hard copy apparatus Interface circuit of video signal hard copy apparatus

1986-09-29

1987-12-15

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358158, 358264, 340814, 455118, H04N 504, H04N 136

Patent

active

047136910

ABSTRACT:
An interface circuit of video signal hard copy apparatus for optimizing a phase of a sampling clock to an image signal. A delayed signal of a video sync signal is employed for a reference input signal of a sampling clock generation circuit. The delay quantity of the video sync signal is arbitrarily set by a control circuit. The delay quantity corresponding to the point of change of sampled data is detected by a CPU circuit according to the sequential comparison with some of the sampled data of an image signal in the plural delay quantities. A stable sampling can be attained even for a high frequency video signal exceeding 100 MHz by setting the optimum delay quantity according to the detected delay quantity.

REFERENCES:
patent: 3637936 (1972-01-01), Krause
patent: 4203075 (1980-05-01), Wessler
patent: 4631600 (1986-12-01), Fukui

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