puredata-doc 0.48.1-3 / usr / share / puredata / doc / 3.audio.examples / E09.FM.spectrum.pd

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#N canvas 127 136 697 536 12;
#X obj 94 188 *~;
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#X obj 18 179 cos~;
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#X obj 136 141 / 100;
#X obj 18 129 phasor~;
#X obj 18 284 output~;
#X obj 17 253 hip~;
#X text 442 513 updated for Pd version 0.37;
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#X obj 29 155 sqrt~;
#X obj 332 109 block~ 4096 1;
#X obj 29 181 biquad~ 0 0 0 0 1;
#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 obj 19 482 / 256;
#X obj 19 412 loadbang;
#X obj 75 528 s fundamental;
#X text 17 359 At load time \, calculate a good choice of fundamental
frequency for showing spectra: the 16th bin in a 4096-point spectrum
\, so SR*16/4096 or SR/256.;
#X obj 231 259 metro 500;
#X obj 231 236 inlet;
#X text 284 234 toggle to graph repeatedly;
#X text 262 212 bang to graph once;
#X obj 19 295 tabwrite~ E09-signal;
#X obj 231 298 tabwrite~ E09-spectrum;
#X obj 19 528 t b f;
#X msg 19 551 \; cm 6;
#X text 25 585 set carrier multiplier after fundamental;
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#X text 442 114 ---- 0.02 seconds ----;
#X text 433 306 2;
#X text 464 306 4;
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#X text 441 321 -- partial number --;
#X text 497 8 WAVEFORM;
#X text 497 157 SPECTRUM;
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#X text 171 117 index (x100);
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#X text 43 3 SPECTRUM OF TWO-OPERATOR PHASE MODULATION;
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#X text 52 57 carrier harmonic #;
#X text 71 367 This patch measures the spectrum of two-operator phase
modulation. The carrier frequency is initially six times the modulation
frequency \, but you can change it with the "carrier harmonic #" control.
Changing the index changes the relative strengths of the harmonics.
Past a certain index (which depends on the carrier frequency) the lower
sidebands begin to reflect about the left edge of the spectrum \, causing
complicated interference effects.;
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