find Pitch-synchronous windowing based on pitch tracking

问题

As seen in comment link a pitch by Talkin’s Robust Algorithm for Pitch Tracking in voicebox (function name is "fxrapt") is extracted.

http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/doc/voicebox/fxrapt.html

However, I need to find pitch pulses in the LP error signal by detecting the maximum amplitude within each pitch period. For each pitch pulse, a Hamming window of two pitch periods long. if T(i-1), T(i), T(i+1) denote the locations of three successive pitch pulses. How can I design a analysis window for the pitch pulse at spans from T(i-1) to T(i+1), as illustrated in bellow link Figure ?

I am looking for MATLAB code for it. I will really appreciate, if anyone can help me. Thanks.

回答1:

Steps:

Apply the pitch track to find the period at each frame, not use overalp in your pitch track, you need do it synchronous and linearly.
At every time that you find the Period = P search the maximun absolute amplitude on the signal between the range 1 to P*2

these two steps can be done like this:

while ( (k+Step-1) <= Nsamples )

    frame = x(k:k+steps-1);

    P=PITCHTRACK_FUNCTION_HERE

    [v, l] = max(abs(frame(1:P*2)));

   if count == 1

      marks(count) = l;

   else

     marks(count) = l+k-1;

  count = count +1;

  k=k+Step;

end

you now have all marks referring to your entire signal, then walk around the vector marks to aplly a Hamming window of two pitch periods long !

test=zeros(length(x),1);

for p=2:length(marks)-2

   last=marks(p-1);

   next=marks(p+1);


   test(last:next)=test(last:next) + x(last:next) .*  hamming(length(x(last:next)));



 end

PS:

x = your signal

Nsamples = length(x)

k = begins with 1

Step = 256 or 512 or 1024 or 2048

来源：https://stackoverflow.com/questions/21952495/find-pitch-synchronous-windowing-based-on-pitch-tracking

标签

matlab