puredata-core 0.48.1-3 / usr / share / puredata / doc / 5.reference / czero~-help.pd

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#N canvas 79 22 585 638 12;
#X obj 54 104 osc~ 100;
#X msg 62 131 clear;
#X obj 90 578 lop~;
#X text 10 579 see also:;
#X text 334 601 updated for Pd version-0.38;
#X obj 96 525 rzero~;
#X obj 37 550 cpole~;
#X obj 37 525 rpole~;
#X obj 155 525 rzero_rev~;
#X obj 96 550 czero~;
#X obj 155 550 czero_rev~;
#X text 243 525 real;
#X text 242 551 complex;
#X text 34 505 1-pole;
#X text 94 505 1-zero;
#X text 154 505 1-zero \, reversed;
#X text 59 484 summary of raw filters:;
#X text 109 130 <-- clear internal state to zero;
#N canvas 255 257 585 372 test 0;
#X obj 124 296 env~ 16384;
#X floatatom 124 320 5 0 0 0 - - -, f 5;
#X floatatom 495 121 4 -1000 1000 0 - - -, f 4;
#X obj 349 324 dac~;
#X obj 349 288 *~;
#X obj 375 115 cos~;
#X floatatom 301 60 5 0 0 0 - - -, f 5;
#X obj 341 112 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0
1;
#X obj 301 110 *~;
#X obj 301 83 phasor~;
#X floatatom 382 66 5 0 0 0 - - -, f 5;
#X obj 382 89 / 1000;
#X obj 419 116 -~ 0.25;
#X obj 419 138 cos~;
#X obj 495 140 / 1000;
#X obj 374 166 *~;
#X obj 419 166 *~;
#X obj 228 296 env~ 16384;
#X floatatom 228 320 5 0 0 0 - - -, f 5;
#X obj 381 284 dbtorms;
#X floatatom 382 264 5 0 0 0 - - -, f 5;
#X obj 245 220 czero~;
#X floatatom 201 132 4 -1000 1000 0 - - -, f 4;
#X obj 92 126 cos~;
#X obj 112 85 phasor~;
#X floatatom 115 60 5 0 0 0 - - -, f 5;
#X obj 125 127 -~ 0.25;
#X obj 125 149 cos~;
#X obj 201 151 / 1000;
#X obj 91 177 *~;
#X obj 125 177 *~;
#X text 214 27 Stuff to test it:;
#X connect 0 0 1 0;
#X connect 2 0 14 0;
#X connect 4 0 3 0;
#X connect 4 0 3 1;
#X connect 5 0 15 0;
#X connect 6 0 9 0;
#X connect 7 0 8 1;
#X connect 8 0 21 0;
#X connect 9 0 8 0;
#X connect 10 0 11 0;
#X connect 11 0 5 0;
#X connect 11 0 12 0;
#X connect 12 0 13 0;
#X connect 13 0 16 0;
#X connect 14 0 16 1;
#X connect 14 0 15 1;
#X connect 15 0 21 2;
#X connect 16 0 21 3;
#X connect 17 0 18 0;
#X connect 19 0 4 1;
#X connect 20 0 19 0;
#X connect 21 0 0 0;
#X connect 21 0 4 0;
#X connect 21 1 17 0;
#X connect 22 0 28 0;
#X connect 23 0 29 0;
#X connect 24 0 26 0;
#X connect 24 0 23 0;
#X connect 25 0 24 0;
#X connect 26 0 27 0;
#X connect 27 0 30 0;
#X connect 28 0 30 1;
#X connect 28 0 29 1;
#X connect 29 0 21 0;
#X connect 30 0 21 1;
#X restore 459 507 pd test;
#X text 130 581 etc.: user-friendly filters;
#X text 10 401 (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.);
#X text 130 105 <-- signal to filter (real part);
#X text 130 187 <-- signal to filter (imaginary part);
#X obj 89 186 sig~;
#X obj 125 210 sig~;
#X text 167 209 <-- filter coefficient (real part);
#X obj 162 233 sig~;
#X text 179 260 <-- creation arguments initialize filter;
#X text 207 276 coefficient (real and imaginary part);
#X text 164 158 <-- set internal state (real&imaginary parts);
#X msg 64 157 set 0.6 0.8;
#X obj 52 7 czero~;
#X text 112 7 complex one-zero (non-recursive) filter \, raw;
#X text 8 31 Czero~ filters a complex audio signal (first two inlets)
via a one-zero filter \, whose coefficients are controlled by creation
arguments or by another complex audio signal (remaining two inlets).
;
#X text 202 233 <-- filter coefficient (imaginary part);
#X text 14 293 The action of czero~ is:;
#X text 73 314 y[n] = x[n] - a[n] * x[n-1];
#X text 11 334 where y[n] is the output \, x[n] the input \, and a[n]
the filter coefficient (all complex numbers). The filter is always
stable.;
#X text 12 383 The transfer function is H(Z) = 1 - aZ^-1.;
#X obj 53 258 czero~ 0.9 0.4;
#X connect 0 0 39 0;
#X connect 1 0 39 0;
#X connect 23 0 39 1;
#X connect 24 0 39 2;
#X connect 26 0 39 3;
#X connect 30 0 39 0;

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