On 2/2/12, Patrice Colet colet.patrice@free.fr wrote:
De: "Ed Kelly" morph_2016@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;