annotate _misc/featureextraction/.svn/text-base/mychroma.m.svn-base @ 9:4ea6619cb3f5 tip

removed log files

function [chromagram,t,salience] = ...
    mychroma(filename, nBins, fmin, used_fs, fracofsecond, calcu)

if isempty(nBins)
    nBins = 3;
end
midbin = ceil(nBins/2);
if isempty(fmin)
    fmin = 55 * 2^(-7/12-(midbin-1)/12/nBins);
end

if isempty(used_fs)
    used_fs=round(44100/4);
end

hopspersecond = 20;
nFFT = 2^nextpow2(used_fs/fracofsecond);
hopsize = used_fs/hopspersecond/nFFT;
noterange = 61;
used_instruments = 1:2;
nInstrument = length(used_instruments);

%% load or generate dictionary
dirc = what('./data');
dicfilename = ['mydict-' num2str(nBins) '.mat'];
if ~calcu && any(strcmp(dirc.mat, dicfilename))
    load(['data/' dicfilename])
else
    % dictionary parameters
    midbin = nBins/2 + .5;
    %hopspersecond = 10;
    secs = .8;
    t = linspace(0,secs,secs*used_fs)';

    % make note dictionary
    A = zeros(noterange*nBins,nFFT/2,nInstrument);
    for iInstrument = used_instruments
        for iMidiNote = 1:noterange
            for iBin = 1:nBins
                f0 = fmin * 2^((iMidiNote-1)/12 + (iBin-1)/12/nBins);
                %wave = zeros(size(t));
                switch iInstrument
                    case 1
                        wave = sum([sin(t*2*pi*f0*1) ...
                            0.6^1 * sin(t*2*pi*f0*2) ...
                            0.6^2 * sin(t*2*pi*f0*3) ...
                            0.6^3 * sin(t*2*pi*f0*4)],2);
                    case 2
                        wave = sin(t*2*pi*f0*1);
                    case 3
                        wave = sum([...
                            0.6^1 * sin(t*2*pi*f0*1/2) ...
                            0.6^2 * sin(t*2*pi*f0*1/3) ...
                            0.6^3 * sin(t*2*pi*f0*1/4) ...
                            0.6^4 * sin(t*2*pi*f0*1/5) ...
                            0.6^5 * sin(t*2*pi*f0*1/6) ...                         
                            0.6^6 * sin(t*2*pi*f0*1/7) ...
                            0.6^7 * sin(t*2*pi*f0*1/8) ...                            
                            0.6^8 * sin(t*2*pi*f0*1/9)],2);
                end
                fftframes0 = myframefft(wave,nFFT,hopsize,'hamming');
                A(nBins*(iMidiNote-1)+iBin,:,iInstrument) = mean(abs(fftframes0(1:round(nFFT/2),:)),2);
            end
        end
    end
    save(['data/' dicfilename], 'A', 'nFFT', 'hopsize');
end

%% get the fft frames from a wave file
fprintf(1,'%s\n',filename)
[audiosize,fs] = wavread(filename,'size');
chunk_sec = 20;
nChunk = ceil(audiosize(1)/fs/chunk_sec);
songframes = [];
s = [];
start = 1;

for iChunk = 1:nChunk
    samplemin = (iChunk-1) * chunk_sec * fs + 1;
    samplemax = min(audiosize(1), (iChunk * chunk_sec + 1) * fs);
    
    audiodata0 = wavread(filename,[samplemin samplemax]);
   
    audiodata = resample(mean(audiodata0,2),used_fs,fs,20);
   
    songframes0 = myframefft(audiodata,nFFT,hopsize,'hamming');
    
    if size(songframes0,2)>=start
        songframes = [songframes(:,1:end-start) abs(songframes0(1:round(nFFT/2),start:end))];
    end
    start = round(hopspersecond/2)+1;
end
clear songframes0
clear audiodata
clear audiodata0

T = size(songframes,2);
t = (0:T-1)./hopspersecond;
fprintf(1, '%d different notes, %d frequency bins, %d time frames\n', noterange,nFFT/2, T)

simpleS = zeros(noterange*nBins,T, nInstrument+1);
songframes(isnan(songframes)) = 0;

for iInstrument = 1:nInstrument
    At = A(:,:,iInstrument);
    for kFrame = 1:T
        simpleS(:,kFrame,iInstrument) = At * songframes(:,kFrame);
    end
end
simpleS(:,:,2) =  max(0,conv2(simpleS(:,:,2), ...
        repmat([-1 -1 4 -1 -1]',1,1),'same'));

%% add the instruments (i.e. the different partial decay bla)
%---------------------------------------------------------
note_s =  (simpleS(:,:,1) .* simpleS(:,:,2));
clear simpleS

%% tuning

wrapped_s = zeros(nBins,T);
for iBin = 1:nBins
    wrapped_s(iBin,:) = sum(note_s(iBin:nBins:end,:));
end
on_circle = exp(i * ((1:nBins)-midbin)/nBins * 2 * pi);
complex_tuning = on_circle * wrapped_s;
smooth_complex_tuning = conv2(complex_tuning,hamming(20*hopspersecond)','same');
tooflat = angle(mean(smooth_complex_tuning)) / (2 * pi) * nBins;
tooflat = repmat(tooflat,T,1);
tuned_s = note_s;
for iFrame = 1:T
    tuned_s(:,iFrame) = interp1(1:nBins*noterange, note_s(:,iFrame), (1:nBins*noterange) + 1 * tooflat(iFrame),[],0);
end

%% reduce to 1 bin per semitone
wrapped_tuned_s = reshape(tuned_s,[nBins,noterange*T]);
wei = rectwin(nBins)';
reduced = reshape(wei * wrapped_tuned_s,noterange,T);

salience.full = s;
salience.reduced = reduced;

%% make chromagram

reduced = medfilt1(reduced',9)';
chromagen = [zeros(12,1) repmat(eye(12),1,5)];


treble_profile = ([0 zeros(1,24) linspace(0,1,6) linspace(1,1,6) ones(1,12)  linspace(1,0,6) zeros(1,6)]);
bass_profile   = [0 ones(1,18) linspace(1,0,12) ,zeros(1,noterange-31)];
wide_profile = max(treble_profile, bass_profile);

treble_salience = reduced .* repmat(treble_profile(:),1,T);
bass_salience = reduced  .* repmat(bass_profile(:),1,T);
wide_salience = reduced  .* repmat(wide_profile(:),1,T);

bass_chromag = circshift(chromagen * bass_salience,6);
wide_chromag = circshift(chromagen * wide_salience,6);

[peakindex,peakindex]=sort(treble_salience,'descend');
for iFrame = 1:T
    treble_salience(peakindex(1,iFrame),iFrame) = treble_salience(peakindex(2,iFrame),iFrame);
end
treble_chromag = circshift(chromagen * treble_salience,6);

chromagram.treble = treble_chromag;
chromagram.bass = bass_chromag;
chromagram.wide = wide_chromag;

% csvwrite('chr.csv',[ones(25,1) [maxn(circshift(bass_chromag,4));ones(1,size(treble_chromag,2)); maxn(circshift(treble_chromag,4))]]');
% csvwrite('tuned_s.csv',[maxn(reduced)]');