view notes/transcriptionMultipleTemplates-annotated.m @ 10:dc1b5f16d000

More notes (about the frequency range retained from the constant Q)

function [ph pz sumY] = transcriptionMultipleTemplates(filename,iter,sz,su)


% Load note templates
load('noteTemplatesBassoon');      W(:,:,1) = noteTemplatesBassoon;
load('noteTemplatesCello');        W(:,:,2) = noteTemplatesCello;
load('noteTemplatesClarinet');     W(:,:,3) = noteTemplatesClarinet;
load('noteTemplatesFlute');        W(:,:,4) = noteTemplatesFlute;
load('noteTemplatesGuitar');       W(:,:,5) = noteTemplatesGuitar;
load('noteTemplatesHorn');         W(:,:,6) = noteTemplatesHorn;
load('noteTemplatesOboe');         W(:,:,7) = noteTemplatesOboe;
load('noteTemplatesTenorSax');     W(:,:,8) = noteTemplatesTenorSax;
load('noteTemplatesViolin');       W(:,:,9) = noteTemplatesViolin;

%% SptkBGCl -> piano (it stands for Sampletek Steinway "Black Grand").
%% It took me a while to figure this out! (It is documented in the
%% MAPS database)
load('noteTemplatesSptkBGCl');     W(:,:,10) = noteTemplatesSptkBGCl;

%pitchActivity = [14 16 30 40 20 21 38 24 35 1; 52 61 69 76 56 57 71 55 80 88]';
pitchActivity = [16 16 30 40 20 21 38 24 35 16; 52 61 69 73 56 57 71 55 73 73]';


%% this turns W0 into a 10x88 cell array in which W0{instrument}{note}
%% is the 545x1 template for the given instrument and note number.
W = permute(W,[2 1 3]);
W0 = squeeze(num2cell(W,1))';

clear('noteTemplatesBassoon','noteTemplatesCello','noteTemplatesClarinet','noteTemplatesFlute','noteTemplatesGuitar',...
    'noteTemplatesHorn','noteTemplatesOboe','noteTemplatesTenorSax','noteTemplatesViolin','noteTemplatesSptkBGCl','W');


% Compute CQT

%% The CQT parameters are hardcoded in computeCQT. It has frequency
%% range 27.5 -> samplerate/3, 60 bins per octave, a 'q' of 0.8 (lower
%% than the maximum, and default, value of 1), 'atomHopFactor' 0.3
%% rather than the default 0.25 (why?), Hann window, default sparsity
%% threshold. The CQT obtained is the interpolated real-valued
%% magnitude spectrogram rather than the complex output.

%% The audio is always resampled to 44100Hz (if it isn't at that rate
%% already) and mixed down to mono.

%% The computed CQT parameters actually obtained are:
%%   10 octaves
%%   highest frequency 14700Hz
%%   lowest frequency 14.5223Hz
%%   column height 600 (60 bpo * 10 oct)
%% But only bins 56:600 are used, the first 55 are dropped, leaving
%% 545 bins per column. I *think* the spectrogram is the "right" way
%% up at this point so those first 55 bins are the lowest-frequency
%% ones, meaning the frequency range actually returned is 27.4144Hz
%% to 14700Hz.

%% for a 43.5 second 44.1 KHz audio file, intCQT will be a 545x30941
%% array, one column every 0.0014 seconds.
[intCQT] = computeCQT(filename);

%% X is sampled from intCQT at 7.1128-column intervals, giving
%% 4350x545 in this case, so clearly 100 columns per second; then
%% transposed
X = intCQT(:,round(1:7.1128:size(intCQT,2)))';

%% median filter to reduce noise -- I think this is essentially the
%% same as Xue's method for devuvuzelation
noiseLevel1 = medfilt1(X',40);
noiseLevel2 = medfilt1(min(X',noiseLevel1),40);
X = max(X-noiseLevel2',0);

%% take every 4th row. We had 100 per second (10ms) so this is 40ms as
%% the comment says. I am guessing we denoised at a higher resolution
%% for better denoising, though still not at the original resolution,
%% for speed. Y is now 1088x545 in our example and looks pretty clean
%% as a contour plot.
Y = X(1:4:size(X,1),:);  % 40ms step

%% a 1x1088 array containing the sum of each column. Doesn't appear to
%% be used in here, but it is returned to the caller.
sumY = sum(Y');

clear('intCQT','X','noiseLevel1','noiseLevel2');

fprintf('%s','done');
fprintf('\n');
fprintf('%s',['Estimating F0s...........']);

% For each 2sec segment, perform SIPLCA with fixed W0
ph = zeros(440,size(Y,1));
pz = zeros(88,size(Y,1));

for j=1:floor(size(Y,1)/100)

    x=[zeros(2,100); Y(1+(j-1)*100:j*100,:)'; zeros(2,100)];
    [w,h,z,u,xa] = cplcaMT( x, 88, [545 1], 10, W0, [], [], [], iter, 1, 1, sz, su, 0, 1, 1, 1, pitchActivity);
   
    H=[]; for i=1:88 H=[H; h{i}]; end;
    ph(:,1+(j-1)*100:j*100) = H;
    Z=[]; for i=1:88 Z=[Z z{i}]; end;
    pz(:,1+(j-1)*100:j*100) = Z';   
    perc = 100*(j/(floor(size(Y,1)/100)+1));
    fprintf('\n');
    fprintf('%.2f%% complete',perc);
end;

len=size(Y,1)-j*100; % Final segment

if (len >0)
x=[zeros(2,len); Y(1+j*100:end,:)'; zeros(2,len)];
[w,h,z,u,xa] = cplcaMT( x, 88, [545 1], 10, W0, [], [], [], iter, 1, 1, sz, su, 0, 1, 1, 1, pitchActivity);
fprintf('\n');
fprintf('100%% complete');

H=[]; for i=1:88 H=[H; h{i}]; end;
ph(:,1+j*100:end) = H;
Z=[]; for i=1:88 Z=[Z z{i}]; end;
pz(:,1+j*100:end) = Z'; 
end;