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Uniform Quantization - PCM

Senthilkumar ● March 24, 2011 ● Coded in Scilab

This program is used to perform uniform Quantization in pulse code modulation transmission.

function [SQNR,xq,en_code] = uniform_pcm(x,L)
  //x = input sequence
  //L = number of qunatization levels 
 xmax = max(abs(x));
xq = x/xmax;
en_code = xq;
d = 2/L;
q = d*[0:L-1];
q = q-((L-1)/2)*d;
for i = 1:L
    xq(find(((q(i)-d/2)<= xq)&(xq<=(q(i)+d/2))))=...     
    q(i).*ones(1,length(find(((q(i)-d/2)<=xq)&(xq<=(q(i)+d/2)))));
    en_code(find(xq == q(i)))= (i-1).*ones(1,length(find(xq == q(i))));
end
  xq = xq*xmax;
  SQNR = 20*log10(norm(x)/norm(x-xq));
endfunction