[sdiy] Filter ICs

[Theo]

I guess when 24dB flanks are the "rule" for 10 band vocoders 50dB for a 20+
band vocoder is not to far off. Some large commercial vocoders used 50+ dB
too.
Phase relation is important so you probably need to add some allpass filters
to compensate, doable but more than likely not easy. But he said to like the
side effects form a large real analogue vocoder, that should include; big,
bulky, difficult to calibrate, expensive and temperature stability
problems,..
On the other hand, the blessings from Digihell; unwanted artifacts, sounds
cold instead of cool and not less difficult to design if you wana do it
right,..

Theo


From: Paul Perry <pfperry at melbpc.org.au>

> At 03:55 PM 4/10/01 -0700, gothgeeksysadmin wrote:
>
> >I'm thinking they look interesting ( 50db cutoff! ) for perhaps
> >a Vocoder.
>
> A sharp cutoff is not necessary (or indeed maybe not even desirable!) for
a
> vocoder. Something to worry about, for example, is phase relationships.
> But, looking at it from the angle of an 'instrument', rather than a
general
> purpose tool, maybe.
>
> paul perry ((Frostwave analog fx) Melbourne Australia
>