Apparatus and method for clamping an image signal

Details Apparatus and method for clamping an image signal Apparatus and method for clamping an image signal

1997-04-09

2000-04-11

Garber, Wendy

Television

Camera, system and detail

Combined image signal generator and general image signal...

348222, 348255, 348697, 358443, 358446, H04N 315

Patent

active

060493550

ABSTRACT:
A clamping circuit for use in a video camera varies a level of an image signal utilizing an analog feedback control signal, converts the varied image signal to a digital image signal, generates a digital zone value signal that corresponds to a level of a reference zone of the digital image signal, digitally detects an amount of error between the digital zone value signal and a predetermined zone value having a non-zero fractional portion, generates from the detected amount of error a digital error signal that has a predetermined number of data bits, switches between a coarse adjustment mode and a fine adjustment mode of the clamping circuit in accordance with a level of the digital error signal, generates, in the coarse adjustment mode, a pulse width modulated signal from the most significant bits of the digital error signal, generates, in the fine adjustment mode, the pulse width modulated signal from the least significant bits of the digital error signal, and generates from the generated pulse width modulated signal the analog feedback control signal.

REFERENCES:
patent: 5268765 (1993-12-01), Yamashita
patent: 5400074 (1995-03-01), Shimizu
patent: 5521639 (1996-05-01), Tomura et al.
patent: 5737018 (1998-04-01), Shimizu et al.

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