Article View: rec.audio
Article #7028Re: Extracting Mono from Stereo
From: Todd Day
Date: Mon, 31 Oct 1988 15:33
Date: Mon, 31 Oct 1988 15:33
27 lines
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1667 bytes
In article <4571@ptsfa.PacBell.COM> dmt@ptsfa.PacBell.COM (Dave Turner) writes: _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? Where did you get just R? By my definitions, you don't have R, but the right channel has R+0.5M. No matter what you do, it is ?impossible? to manipulate M out of the system algebraically. /| Todd Day (805)968-9352 |\ "I go to school, but +-+ | The Audio Club at UCSB | +-+ I never learn what I want to know." +-+ | 926 B Camino Del Sur | +-+ ..!pyramid!comdesign!ivucsb!todd \| Isla Vista, CA 93117 |/ todd@ivucsb.UUCP
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<341@ivucsb.UUCP> <343@ivucsb.UUCP> <3836@ncrcae.Columbia.NCR.COM> <785@mplvax.nosc.MIL> <2125@iscuva.ISCS.COM> <357@ivucsb.UUCP> <4571@ptsfa.PacBell.COM>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!nosc!ucsd!ucsbcsl!comdesign!ivucsb!todd From: todd@ivucsb.UUCP (Todd Day) Newsgroups: rec.audio,sci.electronics Subject: Re: Extracting Mono from Stereo Keywords: mono stereo signal processing Message-ID: <361@ivucsb.UUCP> Date: 31 Oct 88 15:33:21 GMT References: <341@ivucsb.UUCP> <343@ivucsb.UUCP> <3836@ncrcae.Columbia.NCR.COM> <785@mplvax.nosc.MIL> <2125@iscuva.ISCS.COM> <357@ivucsb.UUCP> <4571@ptsfa.PacBell.COM> Reply-To: todd@ivucsb.UUCP (Todd Day) Organization: The Audio Club at UCSB, Isla Vista, California Lines: 26