OK, I'm back.
As far as I can figure, you made two boo-boos. The first was assuming
that the output of [fiddle~] was in Hz, when it is in MIDI.
The second was too many objects in your low-blocksize subpatch. I can't
explain why, but your subpatch was not operating at [block~ 1] for some
reason. The only things that are necessary in that subpatch are the
[vd~] and the [delwrite~]. Everything else should be left out.
I cleaned it up and have attached it here. The one last thing to note is
that [fiddle~] will not give an "accurate" reading of the comb filter
below around 138.5 Hz or MIDI note 49. As the delay gets longer, the
resulting sound becomes less sinusoidal and closer to the noise which is
driving the comb filter.
best,
derek
Davide Morelli wrote:
Hi Derek,
Thank you for the explanation, Karplus-Strong gives charimng sounds.
But I can't make it resonate at the frequency I want.
I made a little testing patch trying to follow your guidelines as much
as I
could.
What's wrong?
I googled a bit and I always found that deltime should be
deltime (sec) = 1/Freq(Hz)
example: to get a A440 sound I should
deltime (msec) = (1/440)*1000
why must we do
deltime (msec) = (samplerate~ / Freq(Hz)) / 1000
instead?
I can't get it...
(.. newbie)
--
derek holzer :::
http://www.umatic.nl
---Oblique Strategy # 36:
"Consult other sources
-promising
-unpromising"
#N canvas 70 40 513 492 10;
#X obj 315 92 samplerate~;
#X obj 315 113 /;
#X obj 315 72 t b f;
#X obj 315 222 sig~;
#X obj 331 132 / 1000;
#X obj 315 152 /;
#X obj 315 199 line;
#X obj 318 11 hsl 128 15 0 127 0 0 empty empty MIDI_note -2 -6 0 8
-262144 -1 -1 8600 1;
#X obj 315 43 mtof;
#X floatatom 379 40 5 0 0 0 - - -;
#X floatatom 378 74 5 0 0 0 - - -;
#X obj 315 174 pack 0 50;
#X obj 269 13 vsl 15 128 0.9 0.999 0 0 empty empty F_back 0 -8 0 8
-262144 -1 -1 11400 1;
#X obj 54 11 noise~;
#X obj 107 11 hsl 128 15 0 1 0 0 empty empty noise_level -2 -6 0 8
-262144 -1 -1 600 1;
#X obj 88 78
*~;
#X obj 271 287 fiddle~;
#X obj 224 359 dac~;
#X floatatom 271 315 5 0 0 0 - - -;
#X text 383 474 derek@umatic.nl;
#X obj 421 37 s midi-note;
#X obj 340 287 r midi-note;
#X floatatom 340 316 5 0 0 0 - - -;
#X msg 53 279 ; pd dsp $1;
#X obj 53 248 tgl 25 0 empty empty empty 0 -6 0 8 -258699 -1 -1 1 1
;
#X text 37 433 [fiddle~] will not be accurate at very low frequencies!
;
#X text 37 393 The sound produced by the comb filter becomes less and
less sinusoidal the lower in frequency/longer in delay length.;
#N canvas 0 0 483 366 comb_filter 0;
#X obj 235 0 inlet~ delay_length;
#X obj 119 0 inlet feedback;
#X obj 35 187 *~;
#X obj 18 0 inlet~ signal;
#X obj 19 214 +~;
#X obj 119 119 line;
#X obj 19 245 delwrite~ $0-pluck 124;
#X obj 235 245 outlet~;
#X obj 295 245 block~ 1;
#X obj 236 96 vd~ $0-pluck;
#X obj 119 96 pack 0 50;
#X text 19 280 Put only ESSENTIAL stuff in this small-blocksize subpatch!
;
#X connect 0 0 9 0;
#X connect 1 0 10 0;
#X connect 2 0 4 1;
#X connect 3 0 4 0;
#X connect 4 0 6 0;
#X connect 5 0 2 1;
#X connect 9 0 7 0;
#X connect 9 0 2 0;
#X connect 10 0 5 0;
#X restore 223 249 pd comb_filter;
#X text 36 462 (i.e. below 138.5 Hz = MIDI note 49);
#X floatatom 117 38 5 0 0 0 - - -;
#X floatatom 231 155 5 0 0 0 - - -;
#X connect 0 0 1 0;
#X connect 0 0 4 0;
#X connect 1 0 5 0;
#X connect 2 0 0 0;
#X connect 2 1 1 1;
#X connect 3 0 27 2;
#X connect 4 0 5 1;
#X connect 5 0 11 0;
#X connect 6 0 3 0;
#X connect 7 0 8 0;
#X connect 7 0 9 0;
#X connect 7 0 20 0;
#X connect 8 0 2 0;
#X connect 8 0 10 0;
#X connect 11 0 6 0;
#X connect 12 0 27 1;
#X connect 12 0 30 0;
#X connect 13 0 15 0;
#X connect 14 0 15 1;
#X connect 14 0 29 0;
#X connect 15 0 27 0;
#X connect 16 0 18 0;
#X connect 21 0 22 0;
#X connect 24 0 23 0;
#X connect 27 0 17 0;
#X connect 27 0 17 1;
#X connect 27 0 16 0;
