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#X text 151 14 Stuff to test it:;
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#X restore 396 562 pd test;
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#X text 202 297 coefficient (real and imaginary part);
#X msg 70 178 set 0.6 0.8;
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#X text 84 341 y[n] = x[n] - a[n] * x[n-1];
#X text 31 369 where y[n] is the output \, x[n] the input \, and a[n] the filter coefficient (all complex numbers). The filter is always stable., f 63;
#X text 32 415 The transfer function is H(Z) = 1 - aZ^-1.;
#X obj 60 279 czero~ 0.9 0.4;
#X text 195 255 <= filter coefficient (imaginary part);
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#X text 18 614 see also:;
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#X obj 234 569 czero_rev~;
#X text 313 546 real;
#X text 312 568 complex;
#X text 111 527 1-pole;
#X text 171 527 1-zero;
#X text 238 511 1-zero \, reversed, f 8;
#X text 20 551 summary of raw filters:, f 12;
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#X text 289 613 - user-friendly filters;
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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 187 645 - not so friendly;
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#X text 326 644 updated for Pd version 0.38;
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#X text 117 81 signal -;
#X text 180 81 signal to filter (real part)., f 49;
#X text 117 149 signal -;
#X text 180 149 signal to filter (imaginary part)., f 49;
#X text 117 182 signal -;
#X text 117 212 signal -;
#X text 180 212 filter coefficient (imaginary part)., f 49;
#X text 180 182 filter coefficient (real part)., f 49;
#X text 124 119 clear -;
#X text 180 99 set internal state (real and imaginary part)., f 49;
#X text 180 119 clear internal state to zero (same as "set 0 0").;
#X text 71 353 1) list - real and imaginary part of coefficient (default 0 0)., f 64;
#X text 117 301 signal - filtered signal \, imaginary part.;
#X text 117 275 signal - filtered signal \, real part.;
#X text 33 99 set <float \, float> -;
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#X text 91 14 complex one-zero filter;
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#X text 451 11 <= click;
#X text 88 11 complex one-zero filter;
#X text 157 178 <= set internal state (real & imaginary parts);
#X text 19 440 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;
#X text 23 48 [czero~] filters a complex audio signal (first two inlets) via a raw one-zero (non-recursive) filter \, whose coefficients are controlled by creation arguments or by another complex audio signal (remaining two inlets)., f 66;
#X text 25 320 The action of [czero~] is:;
#X text 108 125 <-- signal to filter (real part);
#X text 105 152 <-- clear internal state (last samples) to zero;
#X text 130 206 <-- signal to filter (imaginary part);
#X text 165 230 <-- filter coefficient (real part);
#X text 174 281 <-- creation arguments initialize filter;
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