Patent ID: 7304687

Claim:
A ghost cancellation system for a television signal, comprising: an input terminal ( 1 ) for receiving and digitizing an input television signal including a GCR signal with an analog-to-digital converter; a preprocessing unit ( 2 ) for storing a plurality of the received digitized GCR waveforms for consecutive fields, and pre-conditioning the received digitized GCR waveforms by performing a wavelet de-noising operation to improve an S/N level of the GCR waveform; a channel estimation and filter training unit ( 3 ) for characterizing a communication channel based on the received or pre-conditioned GCR waveforms and/or a stored predetermined GCR waveform, and determining optimal filter coefficients for a plurality of filters; a plurality of de-noising filters ( 4 ) for reducing post-ghost echoes by passing the digitized signal through a plurality of transversal filters constituting the de-noising filters; a plurality of equalizing filters ( 5 ) for reducing nearby ghost echoes by passing the ghost-reduced composite signal through a plurality of transversal filters constituting the equalizing filters; and an output terminal ( 6 ) for providing an output video signal in digitized form and/or analog form with a digital-to-analog converter.