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Definition of "DC restoration" |
reinsertion of lost DC level information into a signal after using AC signal coupling; in television applications, the DC component of a composite video signal represents the average brightness of the picture. After AC coupling of the composite video, the DC level includes the average luminance signal plus the fixed average of the sync and lanking signals, causing picture level racking errors. For a positive video signal, the average value of mostly white scenes will be slightly lower than it should be; for mostly dark scenes, theDCaverage could become negative (due to the sync and blanking signals) when it should be slightly positive. Clamping circuits restore the DC average of the video by establishing the DC level of the sync tips. |
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