Can anyone explain me this code of mel spaced filter banks? i have to use this in my speaker recognition project.

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Nishat Anjum Shaikh
Nishat Anjum Shaikh 2011-12-20
function m = melfb(p, n, fs)
% MELFB Determine matrix for a mel-spaced filterbank %
% Inputs: p number of filters in filterbank
% n length of fft
% fs sample rate in Hz %
% Outputs: x a (sparse) matrix containing the filterbank amplitudes
% size(x) = [p, 1+floor(n/2)] %
f0 = 700 / fs;
fn2 = floor(n/2);
lr = log(1 + 0.5/f0) / (p+1);
% convert to fft bin numbers with 0 for DC term
bl = n * (f0 * (exp([0 1 p p+1] * lr) - 1));
b1 = floor(bl(1)) + 1;
b2 = ceil(bl(2));
b3 = floor(bl(3));
b4 = min(fn2, ceil(bl(4))) - 1;
pf = log(1 + (b1:b4)/n/f0) / lr;
fp = floor(pf);
pm = pf - fp;
r = [fp(b2:b4) 1+fp(1:b3)];
c = [b2:b4 1:b3] + 1;
v = 2 * [1-pm(b2:b4) pm(1:b3)];
m = sparse(r, c, v, p, 1+fn2);

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