[PD] Resonant filter using cpole~ czero~

[Mike Moser-Booth]

On Sun, Feb 19, 2012 at 4:54 PM, Mathieu Bouchard <matju at artengine.ca> wrote:
> Why would you change the signs of a and b but not c ?
>
> (Was I giving the formula relative to ax²+bx+c=0 or did I assume ax²+bx=c by
> accident ?)

I think it has to do with where c is in the difference equation:

c*y[n] = g*x[n] + a*y[n-1] + b*y[n-2]

Julius Smith explains it better than I could:
https://ccrma.stanford.edu/~jos/fp2/Z_Transform_Difference_Equations.html

.mmb

-- 
Mike Moser-Booth - mmoserbooth at gmail.com
Master's Student in Music Technology
Schulich School of Music, McGill University
Centre for Interdisciplinary Research in Music Media and Technology

"If you think education is expensive, try ignorance" -Derek Bok