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#X text 83 23 Stuff to test it:;
#X obj 98 179 rzero~;
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#X restore 420 480 pd test;
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#X obj 69 210 rzero~ 1;
#X text 34 283 where y[n] is the output \, x[n] the input \, and a[n]
the filter coefficient. The filter is always stable., f 61;
#X text 35 319 The transfer function is H(Z) = 1 - aZ^-1.;
#X text 94 262 y[n] = x[n] - a[n] * x[n-1];
#X text 133 102 <= signal to filter;
#X text 133 131 <= clear internal state to zero;
#X text 147 158 <= set internal state;
#X text 155 185 <= filter coefficient (may be a signal);
#X text 142 210 <= creation argument initializes filter coefficient
;
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#X obj 119 486 cpole~;
#X obj 119 463 rpole~;
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#X obj 239 486 czero_rev~;
#X text 318 463 real;
#X text 317 485 complex;
#X text 116 444 1-pole;
#X text 176 444 1-zero;
#X text 243 428 1-zero \, reversed, f 8;
#X text 25 468 summary of raw filters:, f 12;
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#X obj 170 530 bp~;
#X obj 205 530 vcf~;
#X text 286 530 - user-friendly filters;
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#X text 24 356 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://msp.ucsd.edu/techniques.htm
for an introduction to the necessary theory (click) =>, f 69;
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#X msg 11 139 browse http://msp.ucsd.edu/techniques/latest/book-html/node127.html
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#X text 194 562 - not so friendly;
#X obj 80 561 fexpr~;
#X obj 135 561 slop~, f 7;
#X text 335 562 updated for Pd version 0.38;
#X text 15 530 see also:;
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#X text 127 79 signal -;
#X text 127 149 signal -;
#X text 134 115 clear -;
#X text 190 79 real signal to filter., f 49;
#X text 92 97 set <float> -;
#X text 190 97 set internal state., f 49;
#X text 190 115 clear internal state to zero (same as "set 0")., f
49;
#X text 190 149 filter coefficient., f 49;
#X text 127 189 signal - filtered signal.;
#X text 129 228 1) float - filter coefficient (default 0)., f 43;
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#X text 92 10 - real one-zero filter;
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#X text 462 9 <= click;
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#X text 82 10 - real one-zero filter;
#X text 37 45 [rzero~] filters an audio signal (left inlet) via a raw
one-zero (recursive) real filter \, whose coefficient is controlled
by a creation argument or by an audio signal (right inlet)., f 64
;
#X text 40 242 The action of [rzero~] is:;
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