/usr/share/puredata/doc/3.audio.examples/H03.band-pass.pd is in puredata-doc 0.48.1-3.
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 | #N canvas 44 0 604 533 12;
#X obj 43 278 mtof;
#X floatatom 43 255 5 0 150 0 - #0-pit -;
#X obj 32 446 output~;
#X obj 32 225 noise~;
#X text 95 254 <-- cutoff (pitch units);
#X text 106 301 <-- cutoff (Hertz);
#X floatatom 43 303 5 0 0 0 - - -;
#X text 330 494 updated for Pd version 0.39;
#X obj 121 414 metro 250;
#X obj 121 394 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0
1;
#X text 139 391 graphing on/off;
#N canvas 0 0 450 300 graph2 0;
#X array H03-graph 882 float 2;
#X coords 0 1 882 -1 200 140 1;
#X restore 375 290 graph;
#X text 399 432 --- 0.02 sec ---;
#X text 98 224 white noise \, test signal;
#X obj 32 361 bp~;
#X text 73 363 band-pass filter;
#X obj 121 439 tabwrite~ H03-graph;
#X floatatom 54 331 5 0 1000 0 - #0-q -;
#X text 106 329 <-- q;
#N canvas 0 0 450 300 loadbang 0;
#X obj 85 16 loadbang;
#X obj 85 40 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X obj 85 59 f \$0;
#X text 18 179 boxes.;
#X text 16 161 This subpatch loads initial values in number;
#X msg 85 83 \; \$1-pit 72 \; \$1-q 1;
#X connect 0 0 1 0;
#X connect 1 0 2 0;
#X connect 2 0 5 0;
#X restore 139 482 pd loadbang;
#X text 154 8 RESONANT (BAND-PASS) FILTER;
#X text 26 129 The two controls specify \, first \, the center frequency
\, and second \, the sharpness of the filter \, commonly called "q".
If you increase q to 10 or 20 \, you will see a drop in total signal
power \, and moreover \, you'll see and hear the resonant frequency
more clearly in the result.;
#X text 28 30 A simple resonant band-pass filter is provided in the
bp~ object. Resonant filters can be tuned to a specific "center frequency"
and then will pass that frequency while attenuating other frequencies
(the further from the center frequency \, the more attenuation). This
patch uses a white noise source to demonstrate bp~.;
#X connect 0 0 6 0;
#X connect 1 0 0 0;
#X connect 3 0 14 0;
#X connect 6 0 14 1;
#X connect 8 0 16 0;
#X connect 9 0 8 0;
#X connect 14 0 2 0;
#X connect 14 0 2 1;
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#X connect 17 0 14 2;
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