Xref: utzoo rec.audio:8772 sci.electronics:4168
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From: todd@ivucsb.UUCP (Todd Day)
Newsgroups: rec.audio,sci.electronics
Subject: Re: Extracting Mono from Stereo
Keywords: mono stereo signal processing
Message-ID: <357@ivucsb.UUCP>
Date: 28 Oct 88 09:18:05 GMT
References: <341@ivucsb.UUCP> <343@ivucsb.UUCP> <3836@ncrcae.Columbia.NCR.COM> <785@mplvax.nosc.MIL> <2125@iscuva.ISCS.COM>
Reply-To: todd@ivucsb.UUCP (Todd Day)
Organization: The Audio Club at UCSB, Isla Vista, California
Lines: 26

In article <2125@iscuva.ISCS.COM> jimc@iscuva.ISCS.COM (Jim Cathey) writes:
_In article <785@mplvax.nosc.MIL> cdl@mplvax.ucsd.edu.UUCP (Carl Lowenstein) writes:
_>If you want to assert that the 'left' signal is  L + M/2 and
_>the 'right' signal is R + M/2, then you will have to devise a way to
_>solve two linear equations in three unknowns before you can get any further.
_
_OK, somebody tell me why you can't take the output from one of those 'vocals
_removers' and subtract that from the original source (presumably yielding what
_was subtracted by the vocals remover)?  I'm sure that in practice there will
_be some difficulty, but this sounds plausible, especially if working in the
_DSP world for the whole process.

Those 'vocals removers' typically subtract the right from the left channel
(or vice versa).  That gives us:
(L+M/2)-(R+M/2) = L + M/2 - R - M/2 = L - R

Now, you want to subtract this from the original source (L+M+R):
(L+M+R) - (L-R) = L + M + R - L + R = M+2R
which is not what you intended...


 
   /| Todd Day (805)968-9352 |\              "I go to school, but
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