Patent ID: 6400393
Filing Date: 2002-06-04
Classification: H04L,H04N

Abstract:
A digital television signal receiver for receiving, a digital television signal composed of a stream of 2N-level symbols each having a symbol epoch of a specified length in time, which stream is susceptible to being accompanied by artifacts of co-channel interfering NTSC analog television signal having an amplitude-modulated video carrier and a frequency-modulated audio carrier said digital television signal receiver comprising:tuner and conversion circuitry for generating an intermediate-frequency signal responsive to said digital television signal; an amplitude detector responsive to said intermediate-frequency signal for reproducing said stream of 2N-level symbols: a bandpass filter for determining the bandwidth of said intermediate-frequency signal so as to suppress the artifacts of said frequency-modulated audio carrier of said co-channel interfering NTSC analog television signal in said stream of 2N-level symbols as reproduced by said amplitude detector; symbol synchronization and equalizer circuitry connected for receiving said stream of 2N-level symbols as reproduced by said amplitude detector and supplying an amplitude and phase equalized response to said stream; circuitry for selectively comb filtering said equalized response to suppress artifacts of said amplitude-modulated video carrier; and symbol decoding circuitry including at least one data slicer responsive to said equalized response as selectively comb filtered.