Path: utzoo!attcan!uunet!cs.utexas.edu!wuarchive!udel!mvac23!thomas
From: thomas@mvac23.UUCP (Thomas Lapp)
Newsgroups: sci.electronics
Subject: Re: Hissing from tape recorders ?
Message-ID: <206.UUL1.3#5131@mvac23.UUCP>
Date: 7 Apr 90 03:05:46 GMT
References: <3190@moondance.cs.uq.oz.au>
Sender: usenet@udel.EDU
Organization: MultiVac23, Newark, DE, U.S.A.
Lines: 31

> Just want to ask a simple question.  I notice that my tape recorder when
> played without a tape hisses.  I just want to know why and how I can
> get rid of the hiss.  Is this because the head have been magnetised one
> way and need demagnetising ?

I can't believe some of the (joking) replies I've seen to this one.
If you are talking about the hiss which gets louder when you turn up the
volume, the reason is that you are hearing the amplification of noise
created by the components making up the amplification circuit.  Cheaper
machines have more hiss.  More expensive recorders have better quality
components which have less noise associated with them.  The hiss is white
noise which results (ultimately) from the brownian motion of the molecules
in the components.  The only way to get rid of this noise is to cool the
machine way down (like liquid gas temperatures).  Not worth the bother
in my opinion ;-)

> Anthony Lee (Humble PhD student) (Alias Time Lord Doctor) 
> ACSnet: anthony@batserver.cs.uq.oz    TEL:+(61)-7-371-2651
> Internet: anthony@batserver.cs.uq.oz.au        +(61)-7-377-4139 (w)
> SNAIL: Dept Comp. Science, University of Qld, St Lucia, Qld 4072, Australia
                         - tom

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