METHOD OF OPERATING THE CHANNEL EQUALIZER IN A RECEIVER FOR DTV SIGNALS SUBJECT TO CO-CHANNEL NTSC INTERFERENCE

摘要

A DTV signal receiver includes an adaptive channel equalization filter, a comb filter (20) for suppressing artifacts of co-channel NTSC interference, and an intersymbol-interference suppression filter (26) compensating for the intersymbol interference introduced by the comb filter (20). The adaptation of the equalization filter coefficients is done so as to be insensitive to the presence or absence of the artifacts of co-channel NTSC interference. This avoids the channel equalization filter attempting to compensate for the intersymbol interference introduced by the comb filter (20), which compensation could not be fully accomplished and would make the intersymbol interference in the comb filter (20) unpredictable. The adaptation of the equalization filter coefficients is done so as not to affect the intersymbol interference introduced by the comb filter (20). Consequently, the intersymbol interference can be properly compensated for by the intersymbol-interference suppression filter (26).