function [out]=pcm_decode(in,v)
n=length(in);
in=reshape(in',8,n/8)'
slot(1)=0;
slot(2)=32
slot(3)=64;
slot(4)=128
slot(5)=256;
slot(6)=512;
slot(7)=1024;
slot(8)=2048;
step(1)=2;
step(2)=2;
step(3)=4;
step(4)=8;
step(5)=16;
step(6)=32;
step(7)=64;
step(8)=128;
for i=1:n/8;
    ss=2*in(i,1)-1;
    tmp=in(i,2)*4+in(i,3)*2+in(i,4)+1;
    st=slot(tmp);
    dt=(in(i,5)*8+in(i,6)*4+in(i,7)*2+in(i,8))*step(tmp)+0.5*step(tmp);
    out(i)=ss*(st+dt)/4096*v;
end