Digital clamp circuit
First Claim
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1. A digital clamp circuit for clamping a digital video signal which represents a subject image in frame units, a reference black signal and a subject signal periodically appearing for each frame of the digital video signal, the digital clamp circuit comprising:
- a clamp circuit for clamping the reference black signal of the digital video signal to a predetermined level; and
a clamp level generation circuit for generating a clamp level by which clamping is performed in the clamp circuit, wherein the clamp level generation circuit includes a comparator circuit for comparing the reference black signal for a plurality of frames with an existing clamp level.
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Abstract
A digital clamp circuit is composed of a clamp circuit and a clamp level generation circuit. The clamp level generation circuit compares the average reference black level BL of a signal Y0 for each frame with a clamp level, stores the comparison result, and then updates a clamp level which is stored in accordance with the comparison results for every predetermined number of frames.
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Citations
5 Claims
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1. A digital clamp circuit for clamping a digital video signal which represents a subject image in frame units, a reference black signal and a subject signal periodically appearing for each frame of the digital video signal, the digital clamp circuit comprising:
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a clamp circuit for clamping the reference black signal of the digital video signal to a predetermined level; and
a clamp level generation circuit for generating a clamp level by which clamping is performed in the clamp circuit, wherein the clamp level generation circuit includes a comparator circuit for comparing the reference black signal for a plurality of frames with an existing clamp level. - View Dependent Claims (2, 3, 4, 5)
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Specification