Article View: comp.dsp
Article #1753Re: 180 deg phase shift
From: James J. Szinger
Date: Tue, 07 May 1991 19:10
Date: Tue, 07 May 1991 19:10
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1660 bytes
In article <1991May5.233533.18783@ux1.cso.uiuc.edu> frerichs@adsl (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
(it would seem from the nature of the problem that a simplistic analog
circuit to do this might be possible... some sort of RC net... if anyone
know if this is possible, PLEASE make it known.)
Thanks
djf
I think what you are looking for is the Hilbert Transform. A
Hilbert Xform shifts the phase of the signal by 90 degrees. Just
cascade two of them together for a total of 180 degrees.
There might be an easier way but I can't quite think of it.
Jim
--
James J. Szinger Becton Center
jim@fuji.eng.yale.edu 15 Prospect Street
Intelligent Sensors Lab. Box 2157 Yale Station
Electrical Engineering New Haven, Connecticut 06520
Yale University U.S.A.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!sdd.hp.com!think.com!yale!cs.yale.edu!rt4-gw.cs.yale.edu!jim From: jim@fuji.eng.Yale.edu (James J. Szinger) Newsgroups: comp.dsp,sci.electronics Subject: Re: 180 deg phase shift Message-ID: <JIM.91May7191024@fuji.eng.Yale.edu> Date: 7 May 91 19:10:24 GMT References: <1991May5.233533.18783@ux1.cso.uiuc.edu> Sender: news@cs.yale.edu (Usenet News) Organization: Yale Univerity, Intelligent Sensors Lab, Elect. Eng. Lines: 28 In-Reply-To: frerichs@adsl's message of 5 May 91 23: 35:33 GMT Nntp-Posting-Host: fuji.eng.yale.edu