混沌PCM加密解密MATLAB源码实现

文件1
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[A,fs,bits]=wavread('ya.wav');
subplot(211);plot(A);title('yuyin');
%x encode to pcm code 
n=length(A);
M=max(A);
 x=(A/M*4096);
   out=zeros(1,8);
%-4096<x<4096
for i = 1:n
if x(i)>0
out(i,1)=1;
else
out(i,1)=0;
end
if abs(x(i))>=0 && abs(x(i))<32
out(i,2)=0;out(i,3)=0;out(i,4)=0;step=2;st=0;
elseif 32<=abs(x(i))&&abs(x(i))<64
out(i,2)=0;out(i,3)=0;out(i,4)=1;step=2;st=32;
elseif 64<=abs(x(i))&&abs(x(i))<128
out(i,2)=0;out(i,3)=1;out(i,4)=0;step=4;st=64;
elseif 128<=abs(x(i))&&abs(x(i))<256
out(i,2)=0;out(i,3)=1;out(i,4)=1;step=8;st=128;
elseif 256<=abs(x(i))&&abs(x(i))<512
out(i,2)=1;out(i,3)=0;out(i,4)=0;step=16;st=256;
elseif 512<=abs(x(i))&&abs(x(i))<1024
out(i,2)=1;out(i,3)=0;out(i,4)=1;step=32;st=512;
elseif 1024<=abs(x(i))&&abs(x(i))<2048
out(i,2)=1;out(i,3)=1;out(i,4)=0;step=64;st=1024;