a_output.m

英文书《Digital Signal Processing with Examples in MATLAB》附带的MATLAB实例

function [yout,N,M]=a_output(y,Nbits,bit,Nbtf,ipr);
% Function used by a_encode to stuff bits into y, 8 bits per word.
% [yout,N,M]=altered values of [y,Nbits,Nbtf].
% M=Nbtf ("# bits to follow") is always returned =0.
% N=next bit to be used. (Not used yet.) N begins at zero.
% ipr has the same effect here as in a_encode when =2.
yout=y;
iy=fix(Nbits/8)+1;
if iy>length(y),
	error('Vector y has been exceeded.')
end
ibit=Nbits-8*(iy-1);
yout(iy)=yout(iy)+bit*2^(7-ibit);
N=Nbits+1;
if ipr==2,
	fprintf([blanks(60),'Nbits, Bit out: %4.0f%3.0f\n'],N,bit);
end
M=Nbtf;
while M>0;
   iy=fix(N/8)+1;
   ibit=N-8*(iy-1);
   yout(iy)=yout(iy)+(1-bit)*2^(7-ibit);
   N=N+1;
	if ipr==2,
   	fprintf([blanks(60),'Nbits, Bit adj: %4.0f%3.0f\n'],N,1-bit);
	end
   M=M-1;
end