puredata-extra 0.48.1-3 / usr / lib / puredata / extra / bob~ / bob~-help.pd

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#N canvas 27 58 1062 722 12;
#X obj 231 347 env~ 8192, f 4;
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#X obj 39 260 env~ 8192, f 5;
#X floatatom 39 300 5 0 0 0 - - -, f 5;
#X obj 279 317 bob~;
#X obj 408 215 / 25;
#X msg 950 229 print;
#X obj 87 259 output~;
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#X obj 291 201 mtof;
#X obj 292 246 pack 0 50;
#X obj 292 271 line~;
#X msg 886 227 clear;
#X obj 280 349 output~;
#X floatatom 291 224 7 0 0 0 - - -, f 7;
#X floatatom 611 177 5 0 999 0 - - -, f 5;
#X msg 611 223 saturation \$1;
#X obj 611 127 loadbang;
#X obj 611 199 / 100;
#X text 885 183 clear or print;
#X text 889 202 filter state;
#X floatatom 748 197 5 1 10 0 - - -, f 5;
#X text 744 122 oversampling;
#X msg 748 224 oversample \$1;
#X text 419 88 "resonance";
#X text 418 105 (>4 to oscillate);
#X obj 748 145 loadbang;
#X msg 748 170 2;
#X text 456 211 scaled to 0-8;
#X text 455 193 0-200 control;
#X text 263 86 resonant or cutoff frequency, f 16;
#X text 300 60 ----- filter parameters ----;
#X text 609 59 ------ optimizations / setup params -------;
#X text 899 161 debugging:;
#X text 603 88 saturation point;
#X text 600 105 of "transistors";
#X msg 611 152 300;
#X obj 408 142 loadbang;
#X msg 408 167 10;
#X text 521 625 "Clear" momentarily shorts out the capacitors in case
the filter has gone unstable and stopped working.;
#X text 523 410 By default bob~ does one step of 4th-order Runge-Kutte
integration per audio sample. This works OK for resonant/cutoff frequencies
up to about 1/2 Nyquist. To improve accuracy and/or to extend the range
of the filter to higher cutoff frequencies you can oversample by any
factor - but note that computation time rises accordingly. At high
cutoff frequencies/resonance values the RK approximation can go unstable.
You can combat this by raising the oversampling factor.;
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#X text 196 32 test signal;
#X text 147 102 pitch;
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#X msg 62 49 57;
#X msg 48 163 80;
#X text 133 180 dB out;
#X msg 60 111 1;
#X obj 362 189 noise~;
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#X coords 0 -1 1 1 95 100 2 100 100;
#X restore 101 96 pd test;
#X text 228 410 output monitor;
#X text 35 321 input monitor;
#X obj 291 130 loadbang;
#X msg 291 155 69;
#X text 47 65 ----- test input ----;
#X text 356 366 <--- adjust output "dB" to hear filter output.;
#X text 21 558 The design is based on papers by Tim Stilson \, Timothy
E. Stinchcombe \, and Antti Huovilainen. See README.txt for pointers.
;
#X text 23 459 The three audio inputs are the signal to filter \, the
cutoff/resonant frequency in cycles per second \, and "resonance" (the
sharpness of the filter). Nominally \, a resonance of 4 should be the
limit of stability -- above that \, the filter oscillates.;
#X text 24 10 bob~ - Runge-Kutte numerical simulation of the Moog analog
resonant filter, f 79;
#X text 876 676 updated for Pd 0.47;
#X text 522 565 The saturation parameter determines at what signal
level the "transistors" in the model saturate. The maximum output amplitude
is about 2/3 of that value.;
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