Path: utzoo!attcan!uunet!clyde.concordia.ca!jarvis.csri.toronto.edu!cs.utexas.edu!rice!uw-beaver!uw-entropy!dataio!pilchuck!ssc!markz
From: markz@ssc.UUCP (Mark Zenier)
Newsgroups: sci.electronics
Subject: Re: Muzak, How Is It Broadcast ???
Message-ID: <377@ssc.UUCP>
Date: 12 Jan 90 07:15:19 GMT
References: <25740@cup.portal.com>
Organization: SSC, Inc., Seattle, WA
Lines: 17

In article <25740@cup.portal.com>, mmm@cup.portal.com (Mark Robert Thorson) writes:
> I seem to recall that Muzak is transmitted in the FM band using some kind
> of funny encoding.  Can someone describe how this works, and what would
> be needed to build a transmitter to break into these broadcasts (purely
> for informational purposes, of course).

These signals are FM subcarriers above 53 Khz, added in with the baseband audio,
and the other stuff that makes up a FM stereo signal.  All of this frequency 
modulates the main carrier. It's all in a package, so you can't override one 
part with out mucking up the rest.

A good way to listen to this stuff is to hook up a VLF receiver to the output 
of the detector of an FM tuner.  Interesting what you find, but the 
@#$%^& Electronic Communications and Privacy Act says you shouldn't.  Most
of elevator music is by subscription and money talks.

markz@ssc.uucp