1 files changed, 104 insertions, 0 deletions
diff --git a/pd/doc/3.audio.examples/butterworth3~.pd b/pd/doc/3.audio.examples/butterworth3~.pd
new file mode 100644
index 00000000..9b6511c6
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+++ b/pd/doc/3.audio.examples/butterworth3~.pd
@@ -0,0 +1,104 @@
+#N canvas -21 471 656 598 10;
+#X obj 59 313 rpole~;
+#X obj 58 379 cpole~;
+#X obj 82 410 cpole~;
+#X obj 58 351 *~;
+#X msg 488 421 clear;
+#X obj 127 160 loadbang;
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+50;
+#X obj 59 289 *~;
+#X obj 131 446 /~;
+#X obj 171 207 samplerate~;
+#X obj 171 228 / 2;
+#X obj 127 250 / 22050;
+#X obj 127 208 f \$1;
+#X obj 127 228 t f b;
+#X obj 135 181 inlet;
+#X obj 397 164 loadbang;
+#X obj 405 185 inlet;
+#X obj 263 162 loadbang;
+#X obj 307 209 samplerate~;
+#X obj 307 230 / 2;
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+#X obj 263 230 t f b;
+#X obj 271 183 inlet;
+#X obj 58 163 inlet~;
+#X obj 488 166 inlet;
+#X obj 155 568 outlet~;
+#X obj 263 210 f \$2;
+#X obj 397 212 f \$3;
+#X text 58 142 audio;
+#X text 133 140 lp freq;
+#X text 263 142 hp freq;
+#X text 395 146 hi/lo norm;
+#X text 490 143 clear;
+#X text 68 10 3-pole \, 3-zero butterworth lp/hp/shelving filter. Args:
+lp freq \, hp freq \, normalize-hi. Inlets: input signal \, lo freq
+\, hi freq \, hi norm \, reset.;
+#X text 70 75 For high-pass: set LP freq =0 and hi/lo to 1;
+#X text 70 56 For low-pass: set HP freq >= SR/2 and hi/lo to 0;
+#X text 69 92 Shelving: HP and LP specify shelving band. Gain difference
+is about HP/LP cubed (so HP=2LP should give about 18 dB \, for example.)
+;
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