语音的倒谱分析.txt

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%求语音的倒谱分析，p231（数字语音处理）。 
clc; 
tic, 
[y,fs]=wavread('d:\MATLAB701\work\sound\A.wav'); 
L=length(y)/512; 
for i=1:L 
    y1=y(1+(i-1)*512:i*512).*hamming(512); 
%y1=y(1:1024).*hamming(1024); 
t=(1/fs:1/fs:length(y1)/fs)*1000; 
subplot(221);plot(t,y1);axis tight; 
x=fft(y1); 
for i=1:length(x)-1; 
    if x(i,1)==0 
    x(i,1)=x(i+1,1); 
    end 
end 
a=2*log2(abs(x)); 
%a=fftshift(a);%平移频率谱。 
%f=((1:(length(a)/2))/fs)*1000; 
subplot(222); 
%plot(f,a(1:length(a)/2));axis tight; 
plot(a(1:length(a)/2)); 
b=ifft(a); 
t=(1/fs:1/fs:length(b)/2/fs)*1000;  % ms 
subplot(223);plot(t,b(1:length(b)/2));axis tight; 
%subplot(224);plot(abs(b));axis tight; 
axis tight; 
%怎么用升余弦窗？？？ 
t=1:size(b)/8; 
xy=(1+cos(2*pi*(t-100)/100))/2; 
%b2=b(1:length(t)).*xy'; 
%plot(b); 
%figure;plot(b2);axis tight; 
pause 
clc; 
end 
toc,