/usr/share/puredata/doc/3.audio.examples/G04.control.blocksize.pd is in puredata-doc 0.46.7-3.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 | #N canvas 100 17 637 513 12;
#N canvas 195 311 647 354 delay-writer 0;
#X obj 86 220 inlet~;
#X obj 86 326 outlet~;
#X obj 392 197 block~ 1;
#X obj 164 267 *~ 0.99;
#X obj 87 272 +~;
#X obj 165 221 inlet;
#X text 80 7 Because of the feedback \, the delwrite~ has to be computed
after the delread~. So we set the blocksize to 1 to minimize the resulting
delay.;
#X text 390 219 this object sets the;
#X text 389 236 block size for audio;
#X text 388 255 computations in this;
#X obj 165 244 delread~ G04-del;
#X obj 98 302 delwrite~ G04-del 1000;
#X text 79 183 incoming;
#X text 81 198 pulses;
#X text 165 182 delay;
#X text 166 197 time;
#X text 388 273 window. Must be a;
#X text 388 292 power of two.;
#X text 77 60 The smaller the blocksize the more expensive the computations
are \, so don't reduce it lower than you have to. Also \, it's a good
idea to isolate the portion of the patch that requires the smaller
block size \, and only run that portion that way. Here \, the pulses
that excite the delay line are computed outside this window \, and
the output level control as well.;
#X connect 0 0 4 0;
#X connect 3 0 4 1;
#X connect 4 0 1 0;
#X connect 4 0 11 0;
#X connect 5 0 10 0;
#X connect 10 0 3 0;
#X restore 153 420 pd delay-writer;
#X obj 283 384 expr 1000/$f1;
#X obj 283 358 mtof;
#X msg 153 355 1;
#X msg 192 355 0;
#X obj 153 254 metro 500;
#X obj 283 304 random 60;
#X obj 153 228 loadbang;
#X obj 283 330 + 30;
#X text 86 9 CONTROLLING DELAY WITH BLOCK~;
#X text 299 420 <-- here is the delay loop;
#X text 63 43 In situations where a delay read feeds back to a delay
write \, the minimum possible delay you can achieve is one block \,
which by default is 64 samples \, or 1.45 msec at 44100 Hz. You can
shorten the minimum delay by changing the block size. Do this in a
subpatch (open it to see how).;
#X obj 153 449 output~;
#X obj 153 387 vline~;
#X text 371 487 updated for Pd version 0.37-1;
#X text 61 124 Here we use this principle to make a harpisichord-like
sound by sending pulses into a recirculating delay line (which imitates
the travel of the wave up and down the harpsichord string.) This is
related to Karplus-Strong synthesis \, but the idea is probably much
older than their paper.;
#X text 33 328 this makes;
#X text 32 346 a rectangular;
#X text 31 384 long.;
#X text 409 366 length of delay line is;
#X text 410 384 1000/(frequency);
#X obj 192 329 del 1;
#X text 32 364 pulse 1 msec;
#X connect 0 0 12 0;
#X connect 0 0 12 1;
#X connect 1 0 0 1;
#X connect 2 0 1 0;
#X connect 3 0 13 0;
#X connect 4 0 13 0;
#X connect 5 0 3 0;
#X connect 5 0 6 0;
#X connect 5 0 21 0;
#X connect 6 0 8 0;
#X connect 7 0 5 0;
#X connect 8 0 2 0;
#X connect 13 0 0 0;
#X connect 21 0 4 0;
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