On 2/2/12, Patrice Colet <colet.patr...@free.fr> wrote: > >> De: "Ed Kelly" <morph_2...@yahoo.co.uk> > >> >> Hi all, >> >> Here is my first attempt at making a resonant lowpass filter using >> cpole~ and czero~ objects. It's the first version I've made which >> actually sounds halfway towards what I want to achieve, which is a >> decent diode-ladder or transistor-ladder filter emulation. I want to >> make this using only vanilla objects, particularly rpole~, cpole~ >> etc. so that they can be ultra-portable and signal-controlled. Also, >> http://www.timstinchcombe.co.uk/index.php?pge=poles#diode >> >> >> Does anyone else have any ideas, or patches we can share? >> >> >> Ed >> >> Gemnotes-0.1alpha: Live music notation for Pure Data >> http://sharktracks.co.uk/ > > > hello, > > using biquad~ gives very nice results for resonant filtering, ggee audio > filters show how it sounds. It should be possible to use vanilla's audio > math objects only for the biquad mathematical functions instead of an > external.
Hi Ed, Patrice This patch ds~ (damped sines) uses the biquad. It works as a resonant filter--I like to feed it impulses. The arguments to the patch are frequency and the number of ms to decay 10 dB ( I think). Copied below. Chuck ds~.pd --------- #N canvas 0 0 337 561 10; #X obj 12 384 biquad~; #X obj 57 351 pack f f f f f; #X obj 145 188 exp; #X obj 156 98 * 44.1; #X text 209 96 ms to samples; #X obj 156 119 t b f; #X obj 145 154 / 44100; #X msg 91 118 -2.30259; #X obj 145 219 t f f; #X obj 17 148 * 6.28319; #X obj 63 208 sin; #X obj 26 210 cos; #X obj 60 257 * 2; #X obj 45 290 * 1; #X obj 92 256 t f f; #X obj 92 279 * 1; #X obj 82 313 * -1; #X msg 132 302 0; #X obj 166 303 * 1; #X msg 199 302 0; #X obj 32 119 / 44100; #X obj 34 180 t f f; #X text 176 189 a; #X text 13 229 cos and sin of b; #X obj 32 78 unpack f f; #X obj 56 460 outlet~; #X obj 11 31 inlet~; #X obj 73 32 inlet; #X obj 158 8 loadbang; #X obj 158 53 \$1; #X obj 188 53 \$2; #X obj 158 30 t b b; #X obj 124 75 pack 100 10; #X connect 0 0 25 0; #X connect 1 0 0 0; #X connect 2 0 8 0; #X connect 3 0 5 0; #X connect 5 0 7 0; #X connect 5 1 6 1; #X connect 6 0 2 0; #X connect 7 0 6 0; #X connect 8 0 12 0; #X connect 8 1 14 0; #X connect 8 1 17 0; #X connect 8 1 19 0; #X connect 8 1 18 1; #X connect 9 0 21 0; #X connect 10 0 18 0; #X connect 11 0 13 0; #X connect 12 0 13 1; #X connect 13 0 1 0; #X connect 14 0 15 0; #X connect 14 1 15 1; #X connect 15 0 16 0; #X connect 16 0 1 1; #X connect 17 0 1 2; #X connect 18 0 1 3; #X connect 19 0 1 4; #X connect 20 0 9 0; #X connect 21 0 11 0; #X connect 21 1 10 0; #X connect 24 0 20 0; #X connect 24 1 3 0; #X connect 26 0 0 0; #X connect 27 0 24 0; #X connect 28 0 31 0; #X connect 29 0 32 0; #X connect 30 0 32 1; #X connect 31 0 29 0; #X connect 31 1 30 0; #X connect 32 0 24 0; _______________________________________________ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list