view src/matlab/chromagram_P.m @ 0:c52bc3e8d3ad tip

user: boblsturm branch 'default' added README.md added assets/.DS_Store added assets/playButton.jpg added assets/stopButton.png added assets/swapButton.jpg added data/.DS_Store added data/fiveoctaves.mp3 added data/glock2.wav added data/sinScale.mp3 added data/speech_female.mp3 added data/sweep.wav added nimfks.m.lnk added src/.DS_Store added src/matlab/.DS_Store added src/matlab/AnalysisCache.m added src/matlab/CSS.m added src/matlab/DataHash.m added src/matlab/ExistsInCache.m added src/matlab/KLDivCost.m added src/matlab/LoadFromCache.m added src/matlab/SA_B_NMF.m added src/matlab/SaveInCache.m added src/matlab/Sound.m added src/matlab/SynthesisCache.m added src/matlab/chromagram_E.m added src/matlab/chromagram_IF.m added src/matlab/chromagram_P.m added src/matlab/chromsynth.m added src/matlab/computeSTFTFeat.m added src/matlab/controller.m added src/matlab/decibelSliderReleaseCallback.m added src/matlab/drawClickCallBack.m added src/matlab/fft2chromamx.m added src/matlab/hz2octs.m added src/matlab/ifgram.m added src/matlab/ifptrack.m added src/matlab/istft.m added src/matlab/nimfks.fig added src/matlab/nimfks.m added src/matlab/nmfFn.m added src/matlab/nmf_beta.m added src/matlab/nmf_divergence.m added src/matlab/nmf_euclidean.m added src/matlab/prune_corpus.m added src/matlab/rot_kernel.m added src/matlab/templateAdditionResynth.m added src/matlab/templateDelCb.m added src/matlab/templateScrollCb.m
author boblsturm
date Sun, 18 Jun 2017 06:26:13 -0400
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function Y = chromagram_P(d,sr,fftlen,nbin,f_ctr,f_sd)
% Y = chromagram_E(d,sr,fftlen,nbin)
%  Calculate a "chromagram" of the sound in d (at sampling rate sr)
%  Use windows of fftlen points, hopped by ffthop points
%  Divide the octave into nbin steps
%  Weight with center frequency f_ctr (in Hz) and gaussian SD f_sd (in octaves)
% 2006-09-26 dpwe@ee.columbia.edu

if nargin < 3;   fftlen = 2048; end
if nargin < 4;   nbin = 12; end
if nargin < 5;   f_ctr = 1000; end
if nargin < 6;   f_sd = 1; end

fftwin = fftlen/2;
ffthop = fftlen/4;  % always for this

D = abs(specgram(d,fftlen,sr,fftwin,(fftwin-ffthop)));

[nr,nc] = size(D);

A0 = 27.5; % Hz
A440 = 440; % Hz

f_ctr_log = log(f_ctr/A0) / log(2);

CM = fft2chromamx(fftlen, nbin, sr, A440, f_ctr_log, f_sd);
% Chop extra dims
CM = CM(:,1:(fftlen/2)+1);

% Keep only local maxes in freq
Dm = (D > D([1,[1:nr-1]],:)) & (D >= D([[2:nr],nr],:));
Y = CM*(D.*Dm);