<div dir="ltr">While in the biquad subject, max to pd translating, I learned that the order and values of coefficients in both don't match... I checked mmb's patches and I see they match pd's native biquad~, but both don't agree to max...<div>
<br></div><div>Max does suggest a different order of the coefficients in its help file, but what we see in practice is yet some other order, and also some reversal in signs (positive/negative) in a couple of terms.<br><div>
<br></div><div>Just wondering, why the hell is that? Anybody?</div><div><br></div><div>Can't deal with formulas really well, but I see they're supposed to be the same... and I take that from mmb's patches, whose formulas are exactly as depicted in max (although the help from native pd's biquad~ is somewhat different, but seemingly equivalent mathematically)</div>
<div><div><br></div></div></div><div>cheers</div><div><br></div><div>ps. by the way, here's a patch that converts the order of coefficients from "max to pd"</div><div><br></div><div><br></div><div><br></div>
<div><div>#N canvas 150 47 214 262 10;</div><div>#X obj 32 7 unpack f f f f f;</div><div>#X obj 125 31 * -1;</div><div>#X obj 101 55 * -1;</div><div>#X obj 41 80 pack f f f f f;</div><div>#X msg 41 115 \$4 \$5 \$3 \$2 \$1;</div>
<div>#X obj 32 -23 inlet;</div><div>#X obj 41 143 outlet;</div><div>#X text 69 -24 max;</div><div>#X text 87 143 pd;</div><div>#X connect 0 0 3 0;</div><div>#X connect 0 1 3 1;</div><div>#X connect 0 2 3 2;</div><div>#X connect 0 3 2 0;</div>
<div>#X connect 0 4 1 0;</div><div>#X connect 1 0 3 4;</div><div>#X connect 2 0 3 3;</div><div>#X connect 3 0 4 0;</div><div>#X connect 4 0 6 0;</div><div>#X connect 5 0 0 0;</div></div></div>