Xref: utzoo rec.audio:8773 sci.electronics:4169
Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!pacbell!ptsfa!dmt
From: dmt@ptsfa.PacBell.COM (Dave Turner)
Newsgroups: rec.audio,sci.electronics
Subject: Re: Extracting Mono from Stereo
Keywords: mono stereo signal processing
Message-ID: <4571@ptsfa.PacBell.COM>
Date: 28 Oct 88 20:17:59 GMT
References: <341@ivucsb.UUCP> <343@ivucsb.UUCP> <3836@ncrcae.Columbia.NCR.COM> <785@mplvax.nosc.MIL> <2125@iscuva.ISCS.COM> <357@ivucsb.UUCP>
Reply-To: dmt@ptsfa.PacBell.COM (Dave Turner)
Organization: Pacific * Bell, San Ramon, CA
Lines: 20

In article <357@ivucsb.UUCP> todd@ivucsb.UUCP (Todd Day) writes:
>
>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...

You stopped too soon. Now subtract R twice:

	M+2R - 2R = M

This seems too simple. What did I miss?



-- 
Dave Turner	415/542-1299	{att,bellcore,sun,ames,pyramid}!pacbell!dmt