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From: mpurtell@IASTATE.EDU (Purtell Michael J)
Newsgroups: comp.dsp,sci.electronics
Subject: Re: 180 deg phase shift
Message-ID: <1991May7.042904@IASTATE.EDU>
Date: 7 May 91 09:29:04 GMT
References: <1991May5.233533.18783@ux1.cso.uiuc.edu> <7821@nst>
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Reply-To: mpurtell@IASTATE.EDU (Purtell Michael J)
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Organization: Iowa State University
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In article <7821@nst>, grayt@Software.Mitel.COM (Tom Gray) writes:
> In article <1991May5.233533.18783@ux1.cso.uiuc.edu>
frerichs@adsl.ece.uiuc.edu (dfRERICHS) writes:
> >Does anyone know the algorithm that would take a stream of sampled
sound
> >,shift it 180 deg in phase and spit it back out again?
> >
> >ie   sound -> a/d -> dsp to shift phase -> d/a -> sound
> >
>  
> Invert the sign bit

Not if it's a 2's complement integer!!

--
-- Michael Purtell --  | "In a hundred years, | There's an Old Irish
Recipe for
mpurtell@iastate.edu   |  we'll all be dead." |   Longevity: Leave the
Table
Iowa State University  |  -- The January Man  |  Hungry.  Leave the Bed
Sleepy.
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Thirsty.