All pass filters?

[sasami]

Essentially, when you mix the all pass filters phase shifted output
signal with the original incoming signal, cancelation occurs at a
particular frequency - thus filtering that frequency out.

Ken

John Speth wrote:
> 
> As I undertstand, in an all-pass filter, essentially no frequency bands are
> attenuated nor boosted but rather frequency band phase is changed.  A phase
> shifter is a perfect example and to make it interesting, the phase shifts
> are usually cyclic to give the sound some motion.
> 
> John Speth
> Object Engineering, Inc
> mailto:johns at oei.com
> 
> > -----Original Message-----
> > From: owner-synth-diy at mailhost.bpa.nl
> > [mailto:owner-synth-diy at mailhost.bpa.nl]On Behalf Of BuDWeiSeR
> > Sent: Thursday, September 03, 1998 5:01 PM
> > To: Synth DIY
> > Subject: All pass filters?
> >
> >
> > This is something i just don't understand. I'm studying computer systems
> > engineering 2nd year, and i'm doing a lot of analogue electronics
> > subjects including filter design etc, but what the hell is an all pass
> > filter used for? If it passes everything then its not really
> > filtering is it?
> >
> >
> > <bUd>
> >
> >

-- 
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                Ken Stone  sasami at blaze.net.au
                   ** Catgirl Paradise **
               <http://www.anime.net/~kens/>
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             <http://www.blaze.net.au/~sasami/>
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