Patent ID: 7224747
Filing Date: 2007-05-29
Classification: H03H

Abstract:
1. A transmitting device for transmitting a digital information signal via a transmission medium, said transmitting device comprising: input means for receiving the digital information signal; adaptive prediction filter means for deriving a prediction signal from the digital information signal in dependence on an array of prediction filter coefficients; first signal combination means for combining the digital information signal and said prediction signal so as to obtain a residual signal; encoding means for encoding said residual signal so as to obtain an encoded signal; coefficient generator means for generating an array of filter coefficients A[i] in response to the digital information signal, i being an integer for which it holds that 0≦i<p, where p is a variable; output means for supplying the encoded signal to an output terminal for transmission via the transmission; and smoothing means for smoothing the array of filter coefficients A[i] so as to obtain the array of prediction filter coefficients for supply to the adaptive prediction filter means, wherein the smoothing means includes low-pass filtering means for low-pass filtering the array of filter coefficients so as to obtain the prediction filter coefficients, and wherein said low-pass filtering means performs the following equations to obtain the coefficients:  whereby i is an integer and 1≦i≦n−2,  Cin[x] being coefficient number x before smoothing, and Cout[x] being coefficient number x after smoothing.