f_quantization.m

audio compression matlab code

function [dq] = f_quantization(d, range)
% "range" is a vector of the quantization levels..

n = length(range);
step = range(n)- range(n-1);

if d >= 0,
  for i = 1:n,
    if (d >= range(i) - step / 2) & (d <= range(i) + step / 2),
         dq = range(i);
         break;
    end;
  end;
else
   for i = 1:n,
      if (d <= range(i) - step /2) & (d <= range(i) + step / 2),
           if i>1, dq = range(i-1); else dq = range(i); end;
           break;
       end;
    end;
end;

if d >= range(n), dq = range(n); break; end;        

if d <= range(1),  dq = range(1);  break; end;