Synchronous signal separation circuit

Details Synchronous signal separation circuit Synchronous signal separation circuit

1995-09-22

1998-09-08

Liang, Regina

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

348525, G04G 500

Patent

active

058051503

ABSTRACT:
A synchronous signal separation circuit is disclosed which separates and fetches a synchronous signal from a video signal to which the synchronous signal has been added. The synchronous signal separation circuit includes an amplifier for amplifying a voltage of the video signal to output an amplified signal having an amplified voltage which is within a predetermined dynamic range. A voltage generator outputs a variable offset voltage to the amplifier for shifting a reference level of the amplified voltage to a predetermined level. A synchronous signal fetch means which, by comparing the amplified video signal with a threshold voltage in which the variable offset voltage has been adjusted based on the degree of amplification of the amplifier, fetches only the synchronous signal from the video signal.

REFERENCES:
patent: 5003406 (1991-03-01), Hatanaka et al.
patent: 5345271 (1994-09-01), Shin

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