Sag compensation circuit for a video signal

Details Sag compensation circuit for a video signal Sag compensation circuit for a video signal

1994-11-02

1996-04-16

Groody, James J.

Television

Synchronization

348521, 348695, H04N 504

Patent

active

055087493

ABSTRACT:
A first clamp circuit clamps a tip of a synchronization signal of input video signal in accordance with a synchronization signal generated from a synchronization signal generator and outputs a clamped video signal. A level detector detects a level of a tip of a synchronization signal of the clamped video signal. A converter converts the detected level to a reference level signal so that the greater the detected level becomes, the smaller the reference level signal becomes. A second clamp circuit clamps the tip of the synchronization signal of the clamped video signal to the reference level signal and outputs an output video signal. Thus, the second clamp circuit compensates a remaining sag component included in the input video signal accurately.

REFERENCES:
patent: 4414572 (1983-11-01), Flory
patent: 4626910 (1986-12-01), Kawamura
patent: 4658297 (1987-04-01), Nomura
patent: 4843470 (1989-06-01), Wook
patent: 5008753 (1991-04-01), Kitaura et al.
patent: 5021886 (1991-06-01), Shibayama
patent: 5142354 (1992-08-01), Suzuki et al.
"An AGC System Design Based Upon the DC Restoration and the Dynamic Characteristics", IEEE, Nov. 1970, vol. BTR-16, No. 4, pp. 329-338.

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