[music-dsp] Re: Blurps and Chirps when changing filter parameters

[robert bristow-johnson]

> ----- Original Message -----
> From: "Julius Smith" <jos at ccrma.stanford.edu>
> To: "A discussion list for music-related DSP" <music-dsp at music.columbia.edu>
> Cc: music-dsp at music.columbia.edu
> Subject: Re: [music-dsp] Re: Blurps and Chirps when changing filter parameters
> Date: Thu, 07 May 2009 10:47:08 -0700
> 
> 
> I haven't read this whole thread, but to isolate coefficient variation from 
> filter state, you can realize your filter as a normalized ladder filter.

Julius, what do you mean by "isolate coefficient variation from filter state"?

i think i know what a normalized ladder form is, i think i know how k1 and k2 are derived from and are dependent on the biquad poles, and i know that the magnitudes of the states are limited in an L^2 norm kinda way.  but wouldn't sweeping the k1 and k2 values possibly introduce artifacts in the normalized ladder?

i'm sure i'm missing something.

--

r b-j                  rbj at audioimagination.com

"Imagination is more important than knowledge."