Digital television system with truncation error correction

摘要

In a digital television signal processing system, first digital samples containing picture information are supplied to a digital processor. The processor operates on the samples to derive second samples that contain picture information modified from the original picture information. The digital processor includes within it processing chain a stage that produces an output digital word that is subject to truncation error when the processor is supplied with selected ones of the first digital samples. The truncation error results in the derivation of second digital samples that contain erroneously modified picture information. The truncation error is detected, and the values of the second digital samples are changed to different ones that contain picture information corrected for the effects of the truncation error.