Patent ID: 8611408

Claim:
An adaptive equalizer filter system for use in a digital television broadcast receiver, the adaptive equalizer filter system being adapted to receive a demodulated baseband signal, comprising: a feedforward equalizer to receive the demodulated baseband signal, having a plurality of adaptive feedforward equalizer coefficients; a decision device having an output that provides an adaptive equalizer filter system forward error correction (FEC) output; a decision feedback equalizer having an output and having an input to receive an adaptive equalizer filter system output, the decision feedback equalizer having a plurality of adaptive decision feedback equalizer coefficients; wherein a sum of the feedforward equalizer output and the decision feedback equalizer output provides an input to the decision device; a frame sync detector having an input and an output, the input receiving the input to the decision device to detect frame sync signals; a channel delay estimation unit (CDEU) having an output that provides an estimate of a channel delay of sync sequences of ghost signals received at the input of the feedforward equalizer; and a control system to receive the outputs of the CDEU and the frame sync detector to adapt the coefficients of the feedforward equalizer and the decision feedback equalizer based on a difference between the summed signal and the FEC output.