> Hi, > > Is vcf~ (which is bandpass) the only available type of signal-controlled > (smoothly-changing) filter? Doesn't the "voltage-controlled" version of > lop~ and hip~ exist? Is it for a "mathematical" reason? (i.e. > impossibility to implement in a relatively simple way) > > Or is it because it is trivial to "build" it in PD? If so, how? > > And if not, how would you "approximate" it, that is create in PD > something similar to a simple low-pass filter whose cutoff frequency is > controlled by a signal? >
Attached are some abstractions I once threw together which should be quite similar to the user-friendly ones. Sorry for the very silly help patch -- I hope I haven't made any stupid mistakes. MB
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#N canvas 104 392 337 344 10; #X obj 38 64 inlet~; #X obj 94 64 inlet~; #X obj 38 243 rpole~; #X obj 185 88 samplerate~; #X obj 185 109 swap 1; #X obj 185 132 /; #X obj 185 64 loadbang; #X obj 94 149 *~ 0; #X obj 38 292 outlet~; #X obj 38 268 rzero~ 1; #X obj 94 171 max~ -1; #X obj 94 193 min~ 0; #X obj 94 109 *~ -6.28318; #X obj 93 227 +~ 1; #X connect 0 0 2 0; #X connect 1 0 12 0; #X connect 2 0 9 0; #X connect 3 0 4 0; #X connect 4 0 5 0; #X connect 4 1 5 1; #X connect 5 0 7 1; #X connect 6 0 3 0; #X connect 7 0 10 0; #X connect 9 0 8 0; #X connect 10 0 11 0; #X connect 11 0 13 0; #X connect 12 0 7 0; #X connect 13 0 2 1;
#N canvas 36 660 566 311 10; #X obj 145 169 -~; #X obj 281 165 -~; #X obj 132 43 noise~; #X obj 272 52 sig~; #X obj 182 110 lop~; #X obj 137 82 vcl~; #X obj 263 96 vch~; #X obj 305 93 hip~; #X floatatom 337 38 5 0 0 0 - - -; #X obj 159 213 print~; #X obj 277 224 print~; #X obj 195 178 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 -1; #X obj 330 179 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 -1; #X text 381 37 <- set cutoff; #X connect 0 0 9 0; #X connect 1 0 10 0; #X connect 2 0 5 0; #X connect 2 0 4 0; #X connect 2 0 6 0; #X connect 2 0 7 0; #X connect 3 0 5 1; #X connect 3 0 6 1; #X connect 4 0 0 1; #X connect 5 0 0 0; #X connect 6 0 1 0; #X connect 7 0 1 1; #X connect 8 0 3 0; #X connect 8 0 7 1; #X connect 8 0 4 1; #X connect 11 0 9 0; #X connect 12 0 10 0;
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