Patent ID: 6313885
Filing Date: 2001-11-06
Classification: H04L,H04N

Abstract:
A digital television signal receiver comprising:demodulator circuitry for demodulating a quadrature-amplitude-modulation (QAM) digital television signal to generate an in-phase sample stream and a quadrature-phase sample stream;baseband equalization and ghost-cancellation filtering having adaptive filtering parameters;a time-division multiplexer for interleaving said in-phase sample stream and said quadrature-phase sample stream on an alternate-sample basis to generate an interleaved sample stream, said interleaved sample stream being applied as input signal to said baseband equalization and ghost-cancellation filtering when said digital television receiver is conditioned for receiving a QAM digital television signal, thereby causing a QAM-reception response from said baseband equalization and ghost-cancellation filtering;a time-division-multiplex de-multiplexer for separating said in-phase sample stream and said quadrature-phase sample stream from said QAM-reception response;a QAM symbol decoder connected for responding to said in-phase sample stream and said quadrature-phase sample stream separated from said QAM-reception response; andcircuitry for generating the adaptive filtering parameters for said baseband equalization and ghost-cancellation filtering, so said baseband equalization and ghost-cancellation filtering operates as a dual-phase filter for said interleaved sample stream supplied thereto as its input signal when said digital television receiver is conditioned for receiving a QAM digital television signal.