latcfilt.m

DSP课程的Matlab程序

function [y] = latcfilt(K,x)

% LATTICE form realization of FIR filters

% ---------------------------------------

% y = latcfilt(K,x)

%   y = output sequence

%   K = LATTICE filter (reflection) coefficient array

%   x = input sequence

%

Nx = length(x)-1;

x = K(1)*x;

M = length(K)-1; K = K(2:M+1);

fg = [x; [0 x(1:Nx)]];

for m = 1:M

    fg = [1,K(m);K(m),1]*fg;

    fg(2,:) = [0 fg(2,1:Nx)];

end

y = fg(1,:);