Patent ID: 6226049
Filing Date: 2001-05-01
Classification: H04N

Abstract:
A method for use in an NTSC rejection filter for removing NTSC signals in a high definition signal, said method comprising the steps of:(a) determining an energy ratio of energy of an expected high definition signal to energy of an input NTSC signal;(b) generating an NTSC signal sequence according to said energy ratio;(c) obtaining an autocorrelation matrix of the input NTSC signal, using said NTSC signal sequence as follows: ##EQU6##where `R.sub.I ` represents an autocorrelation matrix of the NTSC signal with a predetermined number `N` of filter taps, `a` is the energy of the NTSC signal, `b` indicates a 1.times.N vector, `b.sup.T ` indicates the matrix transpose of `b`, and `C` indicates an N.times.N matrix;(d) calculating filter coefficients based on the autocorrelation matrix, where the coefficient `g` of the filter is obtained by the following equation:g=-(C+(N.sub.0 +E.sub.s)I).sup.-1 b,where: `N.sub.0 ` represents the power of Gaussian noise input to an NTSC rejection filter, `E.sub.s ` indicates the mean power of the input high definition signal, and `I` indicates a unit matrix;(e) configuring the NTSC rejection filter based on said calculated filter coefficients; and(f) removing the NTSC signal from the high definition signal using the NTSC rejection filter configured as in step (e).