e85d191b46
- merge v0.01 --> Añadido fileselector - Añadidas fuentes de Gem y Pure Data - pix2jpg incluído en Gem. Archivos de construcción de Gem modificados. - Añadido fichero ompiling.txt con instrucciones de compilación
226 lines
7.4 KiB
Text
226 lines
7.4 KiB
Text
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#X text 131 682 <--ring mod step;
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#X text 256 635 waveshaper;
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#X text 425 791 updated for Pd version 0.37;
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#X text 157 326 frequency;
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#X text 157 342 (tenths of;
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#X text 475 444 -- frequency --;
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#X text 91 216 Fourier series;
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#X text 96 269 magnitude;
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#X text 94 254 calculate;
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#X text 21 3 This subpatch computes the spectrum of the incoming signal
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with a (rectangular windowed) FFT. FFTs aren't properly introduced
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until much later.;
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#X text 83 61 signal to analyze;
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#X msg 211 413 \; pd dsp 1;
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#X text 113 138 hanning window;
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#X restore 148 725 pd fft;
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#X text 229 724 <-- repeatedly;
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#X text 230 704 <-- graph once;
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#X text 17 21 Instead of using the two cosines as FM carrier oscillators
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\, we can use them as ring modulators for a natural or synthetic tone.
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Here we use waveshaping - to wit \, a sinusoid looking up a Gaussian
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bell curve. This has the nice properties that the partials are always
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positive cosines in phase \, and the spectrum spreads out smoothly
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as the index changes.;
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#X text 98 1 PAF: TWO-COSINE RING MODULATOR FOR WAVESHAPER;
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#X text 17 253 Then with ~* we do the ring modulation and we're done.
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This is the PAF (phase-aligned formant) synthesis algorithm (patented
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1993 by IRCAM).;
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#X text 17 129 For phase coherency \, the waveshaper and the cosine
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pair are driven from the same phasor~ object. Since the waveshaping
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is done using a symmetric curve \, its output is at double the frequency
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of the input. So for each cycle of the phasor we compute a half-cycle
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of the sine function (by multiplying by 0.5 and subtracting 0.25 before
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the cosine lookup). We center the cosine output for lookup in a 200-point
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table containing a bell curve.;
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