added doc directory

svn path=/trunk/; revision=220

1 files changed, 35 insertions, 0 deletions

diff --git a/externals/build/doc/lowpass.pd b/externals/build/doc/lowpass.pd
new file mode 100644
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@@ -0,0 +1,35 @@
+#N canvas 365 183 620 467 10;

+#X obj 77 182 print;

+#X floatatom 77 114;

+#X floatatom 162 114;

+#X msg 360 109 \; paint 0;

+#X obj 159 175 filtgain;

+#X msg 91 138 bang;

+#X text 139 93 bandwidth (0 - 100);

+#X text 6 334 See also:;

+#X obj 72 335 bandpass;

+#X obj 139 336 notch;

+#X obj 195 337 lowpass;

+#X obj 247 336 highpass;

+#X obj 247 358 equalizer;

+#X obj 72 357 highshelf;

+#X obj 139 357 lowshelf;

+#X obj 195 357 hlshelf;

+#X text 75 226 These filters are all controlled by a bandwidth which is expressed in octaves. A bandwidth of 100 is equivalent to one octave.;

+#X text 358 25 click first;

+#X text 175 159 click on filtgain to view frequency plot;

+#X text 70 26 ===================================;

+#X text 6 393 (C) Guenter Geiger 2000;

+#X text 75 92 frequency;

+#X text 75 268 Attention \, only the left inlet triggers new coefficients for biquad~;

+#X text 71 12 Lowpass coefficients for biquad~;

+#X msg 360 45 \; pd dsp 1 \; paint 1 \; doit bang \;;

+#X obj 32 114 r doit;

+#X obj 77 160 lowpass 4000 33;

+#X connect 1 0 26 0;

+#X connect 2 0 5 0;

+#X connect 2 0 26 1;

+#X connect 5 0 26 0;

+#X connect 25 0 26 0;

+#X connect 26 0 0 0;

+#X connect 26 0 4 0;