Ghost cancellation reference signal with bessel chirps & PN sequences, & TV receiver using such signal

  • US 6,184,938 B1
  • Filed: 02/04/1999
  • Issued: 02/06/2001
  • Est. Priority Date: 04/22/1992
  • Status: Expired due to Term
First Claim
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1. 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; and

    a 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; and

    means 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.

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