On Tue, Feb 03, 2004 at 03:13:54 +0100, Alfons Adriaensen wrote: > On Tue, Feb 03, 2004 at 01:52:13PM +0000, Steve Harris wrote: > > On Tue, Feb 03, 2004 at 02:21:53 +0100, Tim Goetze wrote: > > > ps: the svf sounds better to me with the 'very slight waveshape for > > > extra stability' removed. > > > > Yeah, but without it the filter tends to explode with highish cutoff > > values (above fs/4 IIRC). I should probably move it to doubles and remove > > the waveshape. > > Moving it to doubles will not help. The problem is that at high F, the > simple mapping from the continuous time domain to the sampled domain breaks > down. You need to modify the params as non-linear functions of F and Q > in order to correct for this.
OK, thanks. Yes, that rings a bell now - I think I made it a bit better by oversampling the input (2 or 4x). I'l have a look at your plugin to see what you've done. - Steve
