[sdiy] SVF & phase

[Magnus Danielson]

From: Tom May <tom at tommay.net>
Subject: Re: [sdiy] SVF & phase
Date: 28 Nov 2002 12:07:26 -0800

> Magnus Danielson <cfmd at swipnet.se> writes:
> 
> > > I'm wondering, what is "better" or "worse" regarding the phase
> > > response of a synthesizer filter?
> > 
> > The actual goal should really be formulated as having a minimal impact on the
> > sound, other than that modification you intended (amplitude modification).
> > Weither phase changes or close to no phase changes are better or not (or even
> > unrelated) is however something one has to discover, but it is not given as
> > being assumed in the original question. This is the difficult thing, separating
> > out the actual requested property and the underlying assumption that led to the
> > formulation used in the question.
> 
> In a synthesizer, phase is an issue since phase changes will affect
> the sound when the filter is modulated, as the changing phase detunes
> the harmonics.

True, but that this was not very clearly stated as the definition of "better".

My point is that you need to know which aspects is in there, or else we can
discuss forever about which is "best", since we will have different assumptions
on what is "best" or for that matter "the problem".

Cheers,
Magnus