[sdiy] standard filters from ladder topology?

[Magnus Danielson]

From: Don Tillman <don at till.com>
Subject: Re: [sdiy] standard filters from ladder topology?
Date: 04 Sep 2005 14:05:35 -0700
Message-ID: <m2r7c45ysg.fsf at till.com>

Don,

>    > Date: Sun, 04 Sep 2005 12:33:32 -0400
>    > From: harrybissell <harrybissell at prodigy.net>
>    > 
>    > I could see the ebenfit to making a voltage tuned filter with
>    > specific response... but I have some doubts as to how it would
>    > sound in a synth application. I'd expect that the difference
>    > would be subtle as best ???
> 
> Maybe; maybe not.  It's probably worth investigating anyway.

Not that I don't enjoy the thread, but I seriously doubt that there is a huge
gain compared the normal filter responses from a musical point of view.

Tuneable Butterworth and Bessel/Thompson are interesting special-cases which
can have uses as part of a larger processing-environment with their maximal
flat amplitude responce and group-delay responce respectively, but as starting
point for a variable-Q VCF I am not so sure of much added benefit. But you did
not say that you where doing that.

Now, this is only what I beleive and real life might be different, but I think
it is an interesting discussion as such.

I am not clear if you meant that one should do multiple insertion of multiple
feedback in order to get the different responces. Both should work IMHO.
Insertion rather than multi-tap is cheaper.

Cheers,
Magnus