Mercurial > hg > ishara
annotate dsp/cepstrum.m @ 32:c3b0cd708782
Imported core dsp tools.
| author | samer |
|---|---|
| date | Sun, 20 Jan 2013 13:48:47 +0000 |
| parents | |
| children |
| rev | line source |
|---|---|
| samer@32 | 1 % cepstrum - generalised cepstral coefficients from warped power spectrogram |
| samer@32 | 2 % |
| samer@32 | 3 % cepstrum :: |
| samer@32 | 4 % [[M]->[K]] ~'which coefficients to compute', |
| samer@32 | 5 % [[K]] ~'edges for (K-2)-band filterbank', |
| samer@32 | 6 % [[N]] ~'centre frequencies of spectrum bins', |
| samer@32 | 7 % [[N,T]] ~'input spectra', |
| samer@32 | 8 % -> [[M,T]] ~'MFCCs for L time slices'. |
| samer@32 | 9 function y = cepstrum(MX,edges,fx,x) |
| samer@32 | 10 melW = tri_filterbank(edges,fx); |
| samer@32 | 11 dctW = dct(eye(size(melW,1))); |
| samer@32 | 12 y = dctW(MX,:)*log(melW*x); |
| samer@32 | 13 end |