Looking again at this, there is another approximation
that appears to be simpler:

BW =  - 2.30259*(sin(2*pi*cf/sr) - 3) / (d*pi)

probably better to use this one instead.

Dr Victor Lazzarini
Music Technology Laboratory
Music Department
National University of Ireland, Maynooth  

Thanks, Victor, this will give me something to expiriment with.

Isaac

>From: Victor Lazzarini 
>Reply-To: csound@lists.bath.ac.uk
>To: csound@lists.bath.ac.uk
>Subject: [Csnd] another solution for fofilter decay and bandwidth
>Date: Wed, 03 May 2006 15:22:03 +0100
>
>Looking again at this, there is another approximation
>that appears to be simpler:
>
>BW =  - 2.30259*(sin(2*pi*cf/sr) - 3) / (d*pi)
>
>probably better to use this one instead.
>
>Dr Victor Lazzarini
>Music Technology Laboratory
>Music Department
>National University of Ireland, Maynooth
>
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