Video signal processing device, information processing system, a

Details Video signal processing device, information processing system, a Video signal processing device, information processing system, a

1996-06-11

1999-08-10

Lee, Michael H.

Television

Synchronization

Automatic phase or frequency control

348572, 327263, H04N 504, H03L 700

Patent

active

059366788

ABSTRACT:
An A/D converter samples an analog video signal, having a frequency corresponding to various types of image supply apparatus, and converts the signal into a digital signal. A sampling clock signal supply circuit supplies a sampling clock signal to the A/D converter, and comprises an edge detection circuit for adjusting the phase of the sampling clock signal. The edge detection circuit subjects the video signal and a delayed video signal to subtraction processing to generate edge pulses. A processor selects a sampling clock signal of a desired phase based on edge information determined by these edge pulses. The present device can also adjust a threshold voltage that is input to the comparator, and the phase of the sampling clock signal based on a digital signal, and supply a dedicated video signal for phase adjustment from a personal computer.

REFERENCES:
patent: 4774577 (1988-09-01), Takimoto
patent: 4791488 (1988-12-01), Fukazawa et al.

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