PCM.zip_pcm编解码

function out=pcm_encode(x) %x encode to pcm code n=length(x); %-4096<x<4096 for i = 1:n if x(i)>0 out(i,1)=1;%符号位 else out(i,1)=0;%符号位 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; elseif 2048<=abs(x(i))&abs(x(i))<4096 out(i,2)=1;out(i,3)=1;out(i,4)=1;step=128;st=2048; else out(i,2)=1;out(i,3)=1;out(i,4)=1;step=128;st=2048; end if(abs(x(i))&abs(x(i)))<4096 out(i,2:8)=[1 1 1 1 1 1 1]; else tmp=floor((abs(x(i))-st)/step); t=dec2bin(tmp,4)-48;%函数dec2bin输出的是ASCII字符串，48对应0 out(i,5:8)=t(1:4); end end out=reshape(out',1,8*n);%行变列