[PD] biquad~ with elementary filters [was: Re: dinosaurs ...]

[Damian Stewart]

Frank Barknecht wrote:
> Hallo,
> Frank Barknecht hat gesagt: // Frank Barknecht wrote:
> 
>>> 1*z^2 - fb1*z^1 - fb2 = 0
>> zb = (-fb1 +- sqrt(fb1*fb1 - 4*fb2)) / 2
> 
> Sorry, the one above is wrong, of course. Given the minus-signs in the
> original transfer formula it should be:
> 
> zb = (fb1 +- sqrt(fb1*fb1 + 4*fb2)) / 2
> 
> if I'm right.

see, Chuck, if Frank gets it wrong what chance do i have? ;-)

d
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damian stewart | skype: damiansnz | damian at frey.co.nz
frey | live art with machines | http://www.frey.co.nz