Xref: utzoo rec.audio:8809 sci.electronics:4185
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From: johng@trwind.UUCP (John Greene)
Newsgroups: rec.audio,sci.electronics
Subject: Re: Extracting "Center Channel" from Stereo Image
Keywords: stereo center channel
Message-ID: <428@trwind.UUCP>
Date: 28 Oct 88 23:21:17 GMT
Article-I.D.: trwind.428
References: <355@ivucsb.UUCP>
Reply-To: johng@trwind.UUCP (John Greene)
Organization: TRW Information Networks Div
Lines: 18

I was just thinking about your article and had an idea.  I haven't thought
out the details but it may work.  

If you ran both channels into an op-amp one side in the non-inverting input and
the other in the inverting input you would get everything you *don't* want at 
the output.  You take this signal and a combined L+R signal into the inverting
and non-inverting inputs of another op-amp.  This would cancel out everything 
thing that you do not want leaving only the stuff you desire.  The tricky part 
would be in getting the levels just right but it may turn out that they don't 
have to be that closely matched to get the desired effect.

Hope this helps.

-- 
John E. Greene    "People are just like frankfurters....You have to decide
                   if you're going to be a hot dog or just another wiener" DLR
TRW Information Networks Division 23800 Hawthorne Blvd, Torrance CA 90505
ARPA: johng@trwind.ind.TRW.COM  USENET: ..trwrb!trwind!johng