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From: fish@ihlpg.UUCP (Bob Fishell)
Newsgroups: net.video
Subject: Re: Stereo TV
Message-ID: <194@ihlpg.UUCP>
Date: Mon, 18-Feb-85 14:43:06 EST
Article-I.D.: ihlpg.194
Posted: Mon Feb 18 14:43:06 1985
Date-Received: Wed, 20-Feb-85 03:25:59 EST
References: <511@intelca.UUCP>
Distribution: net
Organization: AT&T Bell Laboratories
Lines: 20

> Ok, so now TV20 in the Bay Area is going to broadcast in Stereo and my
> stereo ready Sony, has one Mux Out plug on the back. Does anyone know 
> how it is multiplexed? A friend thinks that it has one channel superimposed
> over the other with an FM Subcarrier. If this is the case two questions arise.
> a.) What is the subcarrier frequency and 
> b.) What is the lowest frequency of the modulated subcarrier so that I can
>     figure out where to put the Low Pass cutoff on the other channel.
> 

*** REPLACE THIS MESS WITH YOUR LINEAGE ***
The stereo tv system approved by the FCC last year uses an L-R signal
on a subcarrier, similar to the method used for FM stereo.  However,
the L-R signal is companded a la dbx, so just peeling it off the
subcarrier won't do the trick.  I don't think the compander is
weighted the same as any of dbx' commercial NR units, either.  You'll
have to buy the decoder or wait for the inevitable kits to come out.
/_\_

				Bob Fishell
				ihnp4!ihlpg!fish