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From: steveq@syd.dms.CSIRO.AU (Stephen Quigg)
Newsgroups: comp.dsp,sci.electronics
Subject: Re: 180 deg phase shift
Message-ID: <1991May8.222501.19572@syd.dms.CSIRO.AU>
Date: 8 May 91 22:25:01 GMT
References: <1991May5.233533.18783@ux1.cso.uiuc.edu> <5781@media-lab.media.mit.edu.MEDIA.MIT.EDU>
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In article <5781@media-lab.media.mit.edu.MEDIA.MIT.EDU> cas@media-lab.media.mit.edu (Scud) 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?
>
>Use an op-amp as as inverter (ie with a gain of -1). One chip, one resistor,
>one pot.
>
>cas
 Inverting is NOT the same as 180 deg phase shift. For a symetric waveform
(eg a sine wave) it looks the same, but with something assymetric what you
will see is the waveform upside-down, which is not the same as shifted 180
deg. Phase shifting moves a waveform along the time axis: it stays the same
way up. Try it on an oscilloscope.