/usr/share/puredata/doc/3.audio.examples/F06.packets.pd is in puredata-doc 0.47.1-3.
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#X obj 55 410 *~;
#X obj 327 367 / 10;
#X obj 55 433 clip~ -0.5 0.5;
#X text 327 322 bandwidth;
#X obj 327 436 +~ 1;
#X obj 55 479 +~ 1;
#X obj 206 491 cos~;
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#X text 627 472 --- 0.02 seconds ---;
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#X msg 654 140 \; pd dsp 1;
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#X text 204 573 <-- graph;
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#X obj 55 331 phasor~ 100;
#X text 31 2 WINDOWED PACKETS;
#X text 51 266 fundamental;
#X text 206 260 center;
#X text 204 279 freq. (in;
#X text 203 298 tenths of;
#X text 202 318 fundamental);
#X text 119 493 window;
#X text 241 469 magnified phase;
#X text 283 509 desired center frequency;
#X text 255 492 <--this cosine goes at the;
#X text 284 528 but its phase is reset each;
#X text 282 547 fundamental period.;
#X text 28 32 The simpler of two techniques for making slidable center
frequencies is to synthesize enveloped sinusoidal wave packets. The
packets should repeat at the fundamental frequency \, but the frequency
of the packet itself controls the center frequency of the formant.
The length of the packet varies inversely with bandwidth.;
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#X text 601 635 updated for Pd version 0.37;
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#X text 26 132 In the patch below \, the "clip~" followed by "cos~"
and "+~ 1" is the enveloping ("windowing") function \, which appears
in the top graph. The carrier \, on the other hand \, is a broken sinusoid
made by amplifying the phasor~ (the "*~" controlled by "center freq.")
and taking the cos~ of the result. The "breaks" in the sinusoid only
occur when the enveloping signal is zero.;
#X text 105 464 raised;
#X text 113 479 cosine;
#X text 51 285 frequency;
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