/usr/share/puredata/doc/5.reference/vcf~-help.pd is in puredata-core 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 | #N canvas 1 51 666 539 12;
#X obj 265 266 sig~;
#X text 22 259 test signal;
#X text 108 407 amp in (db);
#X text 100 210 test frequency;
#X text 254 210 center frequency;
#X text 382 250 q;
#X floatatom 130 234 5 0 0 0 - - -, f 5;
#X floatatom 265 237 5 0 0 0 - - -, f 5;
#X obj 130 259 osc~;
#X floatatom 361 269 5 0 0 0 - - -, f 5;
#X obj 130 357 env~ 8192;
#X obj 227 377 env~ 8192;
#X floatatom 129 384 5 0 0 0 - - -, f 5;
#X floatatom 227 406 5 0 0 0 - - -, f 5;
#X obj 80 13 vcf~;
#X text 135 13 -- voltage-controlled bandpass filter;
#X text 34 461 see also:;
#X obj 123 460 bp~;
#X obj 228 330 vcf~ 1;
#X text 298 322 optional argument to initialize q;
#X obj 351 380 env~ 8192;
#X floatatom 351 407 5 0 0 0 - - -, f 5;
#X text 11 43 vcf~ is a resonant band-pass and low-pass filter that
takes an audio signal to set center frequency \, which may thus change
continuously in time. The "Q" or filter sharpness is still only set
by messages. More expensive but more powerful than the bp~ bandpass
filter.;
#X msg 544 67 \; pd dsp 0;
#X msg 544 28 \; pd dsp 1;
#X text 419 509 updated for Pd version 0.46;
#X text 9 129 vcf~ is implemented as a one-pole complex filter with
outlets for the real and imaginary value. These may be used as bandpass
and lowpass filter outputs \, or combined to allow other possibilities.
;
#X text 224 445 (bandpass);
#X text 356 450 (lowpass);
#X text 224 428 real output;
#X text 345 431 imaginary output;
#X connect 0 0 18 1;
#X connect 6 0 8 0;
#X connect 7 0 0 0;
#X connect 8 0 10 0;
#X connect 8 0 18 0;
#X connect 9 0 18 2;
#X connect 10 0 12 0;
#X connect 11 0 13 0;
#X connect 18 0 11 0;
#X connect 18 1 20 0;
#X connect 20 0 21 0;
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