语音信号的滤波&#x5

AN2=0.6;    %   All Pass Numerator constant Stage 2
level = 0.7;
AD2=390;    %   All Pass Denuminator constant Stage 2
%   All Pass stage 1
APden=[1,zeros(1,R5-1),AN1]; %All Pass Denumator
AllPass1 = filter(APnum,APden,combfilt);
num=[AN2,zeros(1,R6-1),1];
den=[1,zeros(1,R6-1),AN2];
%   All Pass stage 2
%   Add the echoes into the original signal and scale down level of echo
REVERB = x + level 3 AllPass2; 
soundsc(REVERB,Fs);
subplot(325);plot(REVERB(1:30000));
xlabel( Time Variant ); ylabel( signal level );
title( Filtered Signal + REVERB );
XF = fft(REVERB,Fs);