Patent ID: 6184938
Filing Date: 2001-02-06
Classification: H04N

Abstract:
A television receiver for use with ghost-cancellation-reference signals of a type that include both a chirp and a pseudo-noise sequence in a selected scan line of a vertical blanking interval of each field of a composite video signal, said television receiver comprising:means for separating the chirp and pseudo-noise sequence portions of the ghost-cancellation-reference signals from the remainder of the composite video signal; anda ghost cancellation filter provided with adjustable filtering weights; an equalization filter provided with adjustable filtering weights and connected in cascade with said ghost cancellation filter to respond to the composite video signal;means responding to the separated chirp portions of the ghost-cancellation-reference signals to calculate a discrete Fourier transform therefrom;means responding to said discrete Fourier transform to determine values of the adjustable filtering weights of the ghost cancellation filter; andmeans responding to the separated pseudo-noise sequence portions of the ghost-cancellation-reference signals to determine values of the adjustable filtering weights of the equalization filter.