Hi list,
I am trying to implement an IIR filter which has the following equation :
Y[k] + a[1]Y[k-1] + a[2]Y[k-2] = X[k]
where X[k] is here a dirac to obtain the impulse response of the filter
(of course, first two calculations are set with null samples)
I get stuck as I try to get the feedback loop of the filter and Pd send
me an "DSP loop detected" error message
I know (as I query the Pd archive) there's a way to achieve it by using
block~ but I can't really understand how it works.
I join my patch if anybody can't point me my mistakes or can improve my
implementation
Thanks for nay help
Sylvain
#N canvas 667 376 465 288 10;
#X obj 46 105 RII;
#X obj 46 65 dirac~;
#X floatatom 108 65 5 0 0 0 - - -;
#X floatatom 151 65 5 0 0 0 - - -;
#X obj 45 161 tabwrite~ RII;
#N canvas 0 0 450 300 graph1 0;
#X array RII 10 float 1;
#A 0 0 0 1 0 0 0 0 0 0 0;
#X coords 0 1 9 -1 200 140 1;
#X restore 230 66 graph;
#X obj 16 17 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X obj 16 40 t b b;
#X msg 38 198 \; RII resize 10;
#X connect 0 0 4 0;
#X connect 1 0 0 0;
#X connect 2 0 0 1;
#X connect 3 0 0 2;
#X connect 6 0 7 0;
#X connect 7 0 4 0;
#X connect 7 1 1 0;
#N canvas 125 589 458 308 10;
#X obj 62 137 z~;
#X obj 62 111 z~;
#X obj 62 183 outlet~;
#X obj 91 112 *~;
#X obj 62 44 inlet~;
#X obj 108 44 inlet;
#X obj 134 136 *~;
#X obj 151 44 inlet;
#X obj 118 72 +~;
#X obj 62 79 +~;
#X connect 0 0 6 0;
#X connect 0 0 2 0;
#X connect 1 0 0 0;
#X connect 1 0 3 0;
#X connect 3 0 8 0;
#X connect 4 0 9 0;
#X connect 5 0 3 1;
#X connect 6 0 8 1;
#X connect 7 0 6 1;
#X connect 8 0 9 0;
#X connect 9 0 1 0;