CLAMPING
An electronic process, which corrects, line-by-line, the video blanking level or sync tips by clamping it to a predefined DC level. The process reduces the DC level changes when switching between different sources, eliminates picture jumps on the screen and the accumulation of low frequency noise and instability. Clamping also increases the dynamic range of video amplifiers by limiting the average picture changes, which stress the video amplifiers.
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