/usr/share/puredata/doc/5.reference/bp~-help.pd is in puredata-core 0.48.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | #N canvas 530 64 651 484 12;
#X obj 124 11 bp~;
#X text 159 11 - BANDPASS FILTER;
#X floatatom 113 293 5 0 0 0 - - -, f 5;
#X floatatom 151 199 0 0 0 0 - - -;
#X floatatom 16 294 5 0 0 0 - - -, f 5;
#X text 203 271 env~ gives the amplitude of the signal envelop in dB.
;
#X floatatom 16 130 0 0 0 0 - - -;
#X msg 544 67 \; pd dsp 0;
#X obj 16 153 osc~ 100;
#X text 61 128 <-- scroll to change input frequency;
#X msg 105 176 clear;
#X text 155 175 <-- reinitialize internal state;
#X msg 544 28 \; pd dsp 1;
#X text 13 73 The left inlet is the incoming audio signal \, the middle
control input sets center frequency and the right input sets "Q".;
#X text 183 200 <-- center frequency;
#X obj 113 243 bp~ 100 10;
#X text 212 247 Arguments initialize center frequency and Q.;
#X text 16 318 Compare the amplitude of the original signal on the
left with the amplitude of the filtered signal on the right.;
#X floatatom 190 221 0 0 0 0 - - -;
#X text 222 222 <-- Q;
#X text 11 35 bp~ passes a sinusoid at the center frequency at unit
gain (approximately). Other frequencies are attenuated.;
#X text 23 445 see also:;
#X obj 108 445 vcf~;
#X obj 15 268 env~ 8192;
#X obj 113 268 env~ 8192;
#X text 400 449 updated for Pd version 0.46;
#X text 15 363 NOTE: the maximum center frequency is sample rate divided
by 6.28 \, or about 12kHz at the "usual" rates - for a more general
and stable (but slightly more CPU-expensive) filter \, try vcf~.;
#X connect 3 0 15 1;
#X connect 6 0 8 0;
#X connect 8 0 15 0;
#X connect 8 0 23 0;
#X connect 10 0 15 0;
#X connect 15 0 24 0;
#X connect 18 0 15 2;
#X connect 23 0 4 0;
#X connect 24 0 2 0;
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