93 lines
1.6 KiB
Plaintext
Executable File
93 lines
1.6 KiB
Plaintext
Executable File
function eval_blit()
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sinc_use_lut = 0
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L = 40000;
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fs = 48000;
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fstart = 110;
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fend = 1550;
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df = (fend-fstart)/L;
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nhw = 4096;
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Hw = kaiser(nhw, 8)';
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ya = zeros(3,1);
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yb = zeros(3,1);
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x = 0.5;
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z = -1;
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f = fstart;
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sqr = 0.0;
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c4 = 0;
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for n = 1:L,
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if x >= 0.5,
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x = x - 1;
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p = fs/f;
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fraq = 1.0/p;
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m = fix((p/2.0)) + 1;
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saw = 0.0;
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c3 = 0.0;
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z = -z;
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ip = 0; % phase of the first output sample in radians
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w = f*pi / fs
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ba1 = 2.0 * cos(w)
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bb1 = 2.0 * cos(w)
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end;
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if sinc_use_lut == 1
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xi = fix((x+0.5)*nsin)+1
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if aa(xi) ~= 0
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blit = fraq*sinc_m(m, xi) * Hw(fix((x+0.5)*nhw)+1);;
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else
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blit = fraq;
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end
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else
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b = fraq*sin(m*x*pi);
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a = sin(x*pi);
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if (a ~= 0)
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blit = b/a * Hw(fix((x+0.5)*nhw)+1);
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else
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blit = fraq;
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end
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end
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saw = saw + blit;
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sqr = sqr + z*blit;
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vsaw(n) = 2*(saw - c3);
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vsqr(n) = 2*(sqr - 0.5);
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vblit(n) = blit;
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vc3(n) = c3;
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x = x + fraq;
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c3 = c3 + fraq;
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f = f + df;
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c4 = c4 + fraq - blit;
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vc4(n) = c4;
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end;
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close all
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figure;
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plot(1:L, vsaw, 1:L, vc4, 1:L, vblit); grid;
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figure;
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plot(vblit); grid;
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figure;
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plot(vc3); grid;
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if sinc_use_lut == 1
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figure;
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plot(sinc_m(nharm, :)); grid;
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end;
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wavwrite(0.5*vc4, fs, 'c4.wav');
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wavwrite(0.5*vc3, fs, 'c3.wav');
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wavwrite(0.5*vsqr, fs, 'sqr.wav');
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wavwrite(0.5*vsaw, fs, 'saw.wav');
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wavwrite(0.5*vblit, fs, 'blit.wav');
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