Video signal clamping device
AssigneeCanon Kabushiki Kaisha
InventorHiroya Miura
Life of this patent
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Abstract
A signal processing device of the present invention includes: an input unit which inputs an analog video signal; an A/D converter which converts the analog video signal to a digital video signal; a detecting unit which detects a level in a predetermined period of the digital video signal output from the A/D converter; a difference output unit which detects a difference between the level detected by the detecting unit and a desired value; a modulating unit which performs sigma-delta modulation on an output from the difference output unit; and a clamping unit which performs a clamping process on the analog video signal input by the input unit based on an output from the modulating unit and which outputs the clamped analog video signal to the A/D converter.
Claims17
A signal processing device comprising:
- an input unit which inputs an analog video signal;
- an A/D converter which converts the analog video signal to a digital video signal;
- a detecting unit which detects a level in a predetermined period of the digital video signal output from the A/D converter;
- a difference output unit which detects a difference between the level detected by the detecting unit and a desired value;
- a gain changing unit which changes an output gain of the difference output unit;
- a modulating unit which performs sigma-delta modulation on an output from the difference output unit;
- and
- a clamping unit which performs a clamping process on the analog video signal input by the input unit based on an output from the modulating unit and which outputs the clamped analog video signal to the A/D converter.
A signal processing device comprising:
- an input unit which inputs an analog video signal;
- an AID converter which converts the analog video signal to digital video signal;
- a detecting unit which detects a level in a predetermined period of the digital video signal output from the A/D converter;
- a difference output unit which detects a difference between the level detected by the detecting unit and a desired value;
- a modulating unit which performs sigma-delta modulation on an output from the difference output unit;
- a setting unit which sets a desired period when the modulating unit outputs a modulation result;
- and
- a clamping unit which performs a clamping process on the analog video signal input by the input unit based on an output from the modulating unit and which outputs the clamped analog video signal to the A/D converter, wherein the clamping unit performs the clamping process only in the desired period set by the setting unit.
Dependencies are inferred from the claim text.