pd-cyclone 0.2~beta1-2 / usr / lib / pd / extra / cyclone / onepole~-help.pd

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#X text 0 20 LICENSE SIBSD;
#X text 0 120 LIBRARY cyclone;
#X text 0 100 OUTLET_0 signal;
#X text 0 0 KEYWORDS signal lowpass filter low pass pole;
#X text 0 40 DESCRIPTION single-pole lowpass filter;
#X text 0 60 INLET_0 signal;
#X text 0 80 INLET_1 float signal;
#X text 0 140 VERSION 0.2-beta1;
#X text 0 158 AUTHOR Krzysztof Czaja;
#X text 1 176 RELEASE_DATE 2002;
#X text 2 195 WEBSITE http://suita.chopin.edu.pl/~czaja/miXed/externs/cyclone.html
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#X text 2 227 HELP_PATCH_AUTHORS Christoph Kummerer. Revised by Jonathan
Wilkes for Pd-extended 0.42 to conform to the PDDP template. Alex Cleveland
updated this patch for Pd-l2ork version 2013.05.28. Fred Jan Kraan
adapted the patch to pd-extended 2015-02-02;
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#X text 6 1 Related Objects;
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#X text 12 23 single-pole lowpass filter;
#X text 109 325 signal;
#X text 109 352 float;
#X text 109 372 signal;
#X text 109 420 signal;
#X text 91 463 1) float;
#X text 180 420 - output of low-pass filter based on args;
#X text 111 539 where k represents the cutoff frequency in radians.
this generates a single-pole lowpass filter with a 6dB/octave attenuation.
;
#X text 162 519 out = prev + k * (in - prev);
#X text 111 499 onepole~ implements the minimal filter equation:;
#X text 111 625 onepole's advantages are efficiency and simplicity.
it works well as a pre- or post-processing stage for other treatments
\, such as waveshaping or filtering \, which can benefit from a gentle
roll-off of high frequencies.;
#X text 111 580 this filter is equivalent to a biquad~ object with
the coefficients \, [ a0 = k \, b1 = k - 1 ] \, as demonstrated above.
;
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#X text 180 325 - input frequency to be filtered;
#X text 180 352 - set cutoff frequency with float;
#X text 180 372 - set cutoff frequency with signal;
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#X obj 154 58 phasor~ 250;
#X obj 153 136 cyclone/onepole~ 200;
#X text 180 464 - initial cutoff frequency;
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#X restore 72 56 graph;
#X text 34 218 The array is placed in a sub-patch to prevent audio
dropouts;
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