Attachment 'sfft.m'

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   1 function S = sfft(s, window, shift)
   2 % 
   3 % short time FFT, S = sfft(s, window, shift)
   4 % 
   5 
   6 frameSize = length(window);
   7 sLength = length(s);
   8 %nFrame = ceil( (sLength-frameSize)/shift )+1;
   9 nFrame = ceil( (sLength-frameSize)/shift );
  10 
  11 if ( nFrame < 1 ), nFrame = 1; end % for the case sLength < frameSize
  12 % adjusting the length of s, padding zero
  13 adjustLength = shift*(nFrame-1) + frameSize; 
  14 s = [s; zeros(adjustLength-sLength,1)]; % column vector
  15 
  16 S=zeros(frameSize, nFrame); 
  17 
  18 begintime=1;
  19 endtime=frameSize;
  20 
  21 for i=1:nFrame,
  22  windowed_signal = s(begintime:endtime) .* window;
  23  S(:,i) = fft(windowed_signal); % rows = frequency bins, columns = number of frames
  24  begintime = begintime + shift;
  25  endtime = endtime + shift;
  26 end;

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  • [get | view] (2011-05-31 20:33:20, 2656.3 KB) [[attachment:ids_lect.pdf]]
  • [get | view] (2011-05-24 15:25:30, 2121.4 KB) [[attachment:kern_struct.pdf]]
  • [get | view] (2011-06-14 10:50:39, 1169.4 KB) [[attachment:mkl_intro.pdf]]
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  • [get | view] (2011-05-17 09:43:15, 7656.4 KB) [[attachment:mnist.mat]]
  • [get | view] (2011-06-07 18:29:45, 192.5 KB) [[attachment:opt_intro.pdf]]
  • [get | view] (2011-05-17 09:43:21, 1.7 KB) [[attachment:rbm.m]]
  • [get | view] (2011-05-02 16:54:43, 0.7 KB) [[attachment:sfft.m]]
  • [get | view] (2011-05-30 13:37:07, 4.3 KB) [[attachment:sheet07.m]]
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  • [get | view] (2011-04-18 07:30:47, 1515.8 KB) [[attachment:ssa_data.mat]]
  • [get | view] (2011-04-18 07:28:13, 585.7 KB) [[attachment:ssa_lecture.pdf]]
  • [get | view] (2011-04-18 07:30:20, 7.4 KB) [[attachment:ssa_simple.m]]
  • [get | view] (2011-07-05 11:05:27, 1202.4 KB) [[attachment:structured_lecture.pdf]]
  • [get | view] (2011-05-30 13:36:38, 1217.5 KB) [[attachment:stud-data.mat.gz]]
  • [get | view] (2011-04-18 07:29:43, 1.0 KB) [[attachment:tkcca_example.m]]
  • [get | view] (2011-04-18 07:29:54, 4.1 KB) [[attachment:tkcca_simple.m]]
  • [get | view] (2011-04-18 07:30:07, 150.9 KB) [[attachment:tkcca_toy_data.mat]]
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