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From: jlg@lanl.ARPA
Newsgroups: net.audio
Subject: Re: question about whispering ghosts
Message-ID: <17976@lanl.ARPA>
Date: Thu, 13-Dec-84 20:08:17 EST
Article-I.D.: lanl.17976
Posted: Thu Dec 13 20:08:17 1984
Date-Received: Sun, 16-Dec-84 06:54:28 EST
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Organization: Los Alamos National Laboratory
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> < ack ~nack >
> 
> When I listen to a record, I can often hear the music that
> begins a track very faintly a second or two before the
> track actually begins.  My understanding was that the wall
> between grooves was thick enough so that the stylus doesn't
> pick up the music embedded in the plastic on the other side
> of the wall.  Is this true?  In either case, where are the
> "ghosts" coming from?

This is an unmistakable sign that the recording was tape mastered.  What
you are hearing is caused by the tape being magnetized by the data that
is on adjacent layers as the tape is wound on the spool.  A good recording
engineer will use thicker tape and will not let the recording level exceed
the threshold of this bleed-through effect.  However, there are a number
of recordings with this problem on the market.