Xref: utzoo rec.audio:8738 sci.electronics:4154
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From: cdl@mplvax.nosc.MIL (Carl Lowenstein)
Newsgroups: rec.audio,sci.electronics
Subject: Re: Extracting Mono from Stereo
Keywords: mono stereo signal processing
Message-ID: <785@mplvax.nosc.MIL>
Date: 24 Oct 88 20:24:42 GMT
References: <341@ivucsb.UUCP> <343@ivucsb.UUCP> <3836@ncrcae.Columbia.NCR.COM>
Reply-To: cdl@mplvax.ucsd.edu.UUCP (Carl Lowenstein)
Organization: U.C. San Diego, Marine Physical Laboratory
Lines: 22

>>In article <341@ivucsb.UUCP> I (Todd Day) write:
>>_I have a very interesting signal processing problem for those signal
>>_processing gurus.

>>_I want to use a DSP chip to extract mono from stereo.  Does anybody
>>_know of any algorithms to accomplish this or can anyone direct me to
>>_any literature that might describe this?

>>Your smart-aleck answers are not appreciated.  I won't summarize these. :-)

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.

Otherwise, as has been pointed out repeatedly,the best you can do with a linear
circuit is the original compatibility designed into FM stereo broadcasts and
stereo LP records, namely, mono = (L + R)  (/2 for purists).

-- 
	carl lowenstein		marine physical lab	u.c. san diego
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