puredata-doc 0.48.1-3 / usr / share / puredata / doc / 3.audio.examples / F05.ring.modulation.pd

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#X text 552 349 ---- 0.02 seconds ----;
#X text 507 563 updated for Pd version 0.37;
#X text 495 155 0;
#X text 534 174 -- partial number --;
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#X text 53 5 This is a modified version of the pulse train generator
from two examples back.;
#X text 107 140 We have to add 1/2 and wrap so that the center of the
pulse comes at phase zero (previously it was 1/2 cycle out of phase).
This wasn't a problem before but now we have to be in phase with the
oscillator we're multiplying with.;
#X text 276 262 otherwise it's the same as before.;
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#X text 83 61 <-- bandwidth;
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#X text 113 123 <-- modulation frequency as;
#X text 152 137 multiple of fundamental;
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#X text 93 93 Fourier series;
#X text 98 146 magnitude;
#X text 96 131 calculate;
#X text 21 3 This subpatch computes the spectrum of the incoming signal
with a (rectangular windowed) FFT. FFTs aren't properly introduced
until much later.;
#X text 83 61 signal to analyze;
#X text 193 164 delay two samples;
#X text 191 182 for better graphing;
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#X msg 224 321 \; pd dsp 1;
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#X text 179 244 <-- repeatedly;
#X text 180 224 <-- graph once;
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#X text 122 185 modulating oscillator;
#X text 153 6 RING MODULATED PULSE TRAINS;
#X text 23 357 Now we take a pulse train and ring modulate it \, which
effectively aliases the spectrum so that it is centered at any desired
partial number. The "bandwidth" control still affects the shape of
the peak \, independently of where it is centered. This generates a
formant centered at the given partial.;
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#X text 23 457 This patch is limited to making formants centered on
harmonics. The center frequency thus can't be moved smoothly up and
down at will (try shift-clicking on modulation frequency to make fractions).
Next we'll look at two techniques for sliding a formant frequency without
losing harmonicity.;
#X text 184 85 <-- pulse train;
#X text 220 101 generator from before;
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