69 lines
1.2 KiB
Matlab
Executable File
69 lines
1.2 KiB
Matlab
Executable File
function eval_blit3()
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L = 64000;
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Nb = 137;
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Nphases = 256;
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fs = 48000;
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fstart = 110*4;
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fend = 110*4;
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df = (fend-fstart)/L;
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fcut = 16000;
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x = (0:Nb*Nphases-1) - (Nb*Nphases-1)/2;
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H = sinc(2*fcut/fs.*x/Nphases);%.*kaiser(Nphases*Nb, 8)';
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Hw = kaiser(Nb, 18)';
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for ii=0:Nphases-1,
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for jj=0:Nb-1
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Hs(ii+1,jj+1) = H(Nphases-ii+Nphases*jj);
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end
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end;
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f = fstart;
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Pic = 1;
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blit(1:L) = zeros(1, L);
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blit_bp(1:L) = zeros(1, L);
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pol = 1;
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for n = Nb:L,
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P = fs/f;
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Pi = floor(P);
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Pf = 1+fix(Nphases*(P - Pi));
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if Pic >= Pi,
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blit(n-Nb+1:n) = blit(n-Nb+1:n) + Hs(Pf,:).*Hw;
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blit_bp(n-Nb+1:n) = blit_bp(n-Nb+1:n) + pol*Hs(Pf,:).*Hw;
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Pic = 0;
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pol = -pol;
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end;
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Pic = Pic + 1;
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f = f + df;
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end;
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mean_blit = 0.0034;
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mean_saw = 0.00;
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saw(1:L) = zeros(1, L);
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sqr(1:L) = zeros(1, L);
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y_saw = 0;
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y_sqr = 0;
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for n = 2:L,
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y_saw = y_saw + blit(n)-mean_blit;
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y_sqr = y_sqr + blit_bp(n);
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saw(n) = -y_saw -1;
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sqr(n) = y_sqr;
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end;
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saw_nodc = filter([1 -1], [1 -0.995], saw);
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sqr_nodc = filter([1 -1], [1 -0.995], sqr);
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close all;
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plot(saw); grid;
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figure;
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plot(saw_nodc); grid;
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wavwrite(0.8*blit, fs, 'blit.wav');
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wavwrite(0.7*saw_nodc, fs, 'saw.wav');
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wavwrite(0.5*sqr_nodc, fs, 'sqr.wav');
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