DTV receiver symbol decoding circuitry with co-channel NTSC artifacts suppression filter before data slicer

摘要

A data slicer for use in a digital television signal receiver in a television set or in a digital video recorder includes digital filtering for suppressing artifacts of NTSC co-channel interference in the symbol coding offered for data slicing. The artifacts are suppressed by combining baseband symbol coding with predicted estimates of those artifacts. Data slicing results are fed back and combined with symbol coding to generate a revised estimate of error that would arise from unsuppressed artifacts of NTSC co-channel interference. This revised estimate of error that would arise from unsuppressed artifacts of NTSC co-channel interference is delayed, to be used as a predicted estimate of error that would arise from unsuppressed artifacts of NTSC co-channel interference in a later symbol epoch. In this later symbol epoch the preliminary estimate is combined with later received symbol coding that should have substantially the same error caused by unsuppressed artifacts of NTSC co-channel interference, for suppressing that error.