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#X text 12 125 LIBRARY internal;
#X text 12 165 WEBSITE http://crca.ucsd.edu/~msp/;
#X text 12 25 LICENSE SIBSD;
#X text 12 145 AUTHOR Miller Puckette;
#X text 12 205 HELP_PATCH_AUTHORS Updated for Pd version-0.38. Jonathan
Wilkes revised the patch to conform to the PDDP template for Pd version
0.42.;
#X text 12 5 KEYWORDS signal filter;
#X text 12 45 DESCRIPTION real one-pole (recursive) filter \, raw;
#X text 12 85 INLET_1 float signal;
#X text 12 65 INLET_0 signal clear set;
#X text 12 105 OUTLET_0 signal;
#X text 12 185 RELEASE_DATE 1997;
#X restore 500 597 pd META;
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pdpedia: rpole~;
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#X msg 111 139 clear;
#X msg 113 165 set 1;
#X text 163 165 <-- set internal state;
#X text 163 108 <-- signal to filter;
#X text 182 195 <-- filter coefficient (may be a signal);
#X text 182 217 <-- creation argument initializes filter coefficient
;
#X text 163 139 <-- clear internal state to zero;
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#X text 80 18 Stuff to test it:;
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#X text 11 23 real one-pole (recursive) filter \, raw;
#X text 50 58 [rpole~] filters an audio signal (left inlet) via a one-pole
real filter \, whose coefficient is controlled by a creation argument
or by an audio signal (right inlet).;
#X text 98 346 signal;
#X text 168 346 - the incoming signal to filter.;
#X text 98 366 clear;
#X text 168 366 - clear internal state to zero.;
#X text 98 386 set;
#X text 168 386 - set internal state (e.g. \, "set 1").;
#X text 98 412 float;
#X text 98 462 signal;
#X text 168 462 - the outgoing \, filtered signal.;
#X text 108 264 y[n] = y[n-1] + a[n] * x[n];
#X text 49 316 The transfer function is H(Z) = 1/(1 - aZ^-1).;
#X text 49 284 where y[n] is the output \, x[n] the input \, and a[n]
the filter coefficient. The filter is unstable if/when |a[n]|>1.;
#X text 80 505 1) float;
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#X text 201 60 real;
#X text 200 81 complex;
#X text 22 44 1-pole;
#X text 71 44 1-zero;
#X text 121 44 1-zero \, reversed;
#X text 47 29 summary of raw filters:;
#X text 18 184 User-friendly Filters;
#X obj 21 213 lop~;
#X obj 72 212 hip~;
#X obj 124 213 bp~;
#X obj 169 214 vcf~;
#X obj 22 274 biquad~;
#X text 18 250 Other Objects;
#X text 18 113 Pd also provides a suite of user-friendly filters. This
and other raw filters are provided for situations which the user-friendly
ones can't handle. See Chapter 8 of http://crca.ucsd.edu/~msp/techniques
for an introduction to the necessary theory.;
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#X text 98 430 signal;
#X text 167 430 - filter coefficient.;
#X text 167 412 - filter coefficient.;
#X text 167 505 - (optional) initializes filter coefficient.;
#X text 49 242 The action of [rpole~] is:;
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doc/3.audio.examples/H11.shelving.pd;
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