From 4d84d14ac1aa13958eaa2971b03f7f929a519105 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?IOhannes=20m=20zm=C3=B6lnig?=
 <zmoelnig@users.sourceforge.net>
Date: Fri, 8 Feb 2008 13:00:32 +0000
Subject: reorganized

svn path=/trunk/; revision=9400
---
 desiredata/doc/3.audio.examples/H13.butterworth.pd | 74 ++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 desiredata/doc/3.audio.examples/H13.butterworth.pd

(limited to 'desiredata/doc/3.audio.examples/H13.butterworth.pd')

diff --git a/desiredata/doc/3.audio.examples/H13.butterworth.pd b/desiredata/doc/3.audio.examples/H13.butterworth.pd
new file mode 100644
index 00000000..4cdcb628
--- /dev/null
+++ b/desiredata/doc/3.audio.examples/H13.butterworth.pd
@@ -0,0 +1,74 @@
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+#N canvas 0 0 450 300 graph2 0;
+#X array \$0-tab1 100 float 1;
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+#X restore 615 71 graph;
+#X obj 32 250 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
+-1;
+#X floatatom 40 294 3 0 0 0 - - -;
+#X text 670 377 frequency;
+#N canvas 876 177 375 255 startup 0;
+#X obj 22 24 loadbang;
+#X obj 22 48 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
+-1;
+#X obj 22 67 f \$0;
+#X text 35 195 This subpatch loads initial;
+#X text 31 219 values in number boxes.;
+#X msg 22 91 \; \$1-lf 80 \; \$1-hf 150 \;;
+#X connect 0 0 1 0;
+#X connect 1 0 2 0;
+#X connect 2 0 5 0;
+#X restore 324 431 pd startup;
+#X text 553 359 gain=0;
+#X obj 32 446 filter-graph2 \$0-tab1;
+#X text 593 60 5;
+#X text 610 370 0;
+#X text 598 301 1;
+#X text 575 435 updated for Pd version 0.39;
+#X text 186 -4 BUTTERWORTH FILTER;
+#X obj 216 398 butterworth3~;
+#X floatatom 244 340 3 0 100 0 - #0-lf -;
+#X floatatom 291 339 3 85 150 0 - #0-hf -;
+#X obj 244 366 mtof;
+#X obj 291 366 mtof;
+#X text 790 373 5000;
+#X obj 32 271 filter-graph1 100 5000;
+#X text 232 318 poles;
+#X text 288 318 zeros;
+#X text 24 20 The butterworth filter can be configured for low-pass
+\, high-pass \, and shelving \, depending on the placement of the poles
+and zeros. For low-pass \, the poles are placed to set the cutoff frequency
+and the zeros are at -1 (the Nyquist). Leaving the poles fixed and
+moving the zeros then gives shelving filters. In this example \, the
+actual filtering is relegated to an abstraction (butterworth3~) which
+takes frequencies corresponding to the pole and zero placement.;
+#X text 24 147 The butterworth3~ abstraction computes filter coeffients
+using control messages \, and so it is not suitable for continuously
+time-varying Butterworth filters. For that \, it is often appropriate
+to use time-saving approximations \, but precisely which approximations
+to use will depend on the way the filter is to be used.;
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+#X connect 13 0 15 0;
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+#X connect 15 0 12 1;
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+#X connect 18 1 12 0;
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-- 
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