Newsgroups: sci.image.processing
From: Steve@dstrip.demon.co.uk (Steve Rencontre)
Path: cantaloupe.srv.cs.cmu.edu!rochester!cornell!travelers.mail.cornell.edu!news.kei.com!news.mathworks.com!news.alpha.net!uwm.edu!math.ohio-state.edu!jussieu.fr!oleane!pipex!peernews.demon.co.uk!dstrip.demon.co.uk!Steve
Subject: Re: stochastic resonance
References: <3ifqo0$ask@ucsbuxb.ucsb.edu> <9502202358.AA16169@aslmr-serv.med.ge.com>
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Date: Fri, 24 Feb 1995 08:09:10 +0000
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In article: <3ifqo0$ask@ucsbuxb.ucsb.edu>  will@icess.ucsb.edu (William C. Snyder) writes:
> 
> In article <9502202358.AA16169@aslmr-serv.med.ge.com>, carl@aslmr-serv.med.ge.com (Carl R. Crawford) says:
> ...
> >that you can hear subcritical tones if sufficient white noise is added
> ...
> Sounds like dithering to me. Dithering is applied, for instance, during the 
> digitizing of analog signals and is quite useful. 
> ...

I think that's a quite different thing. The purpose of adding dither  
to an A-D system is to convert the highly signal-dependant quantisation 
'noise' (which is really a non-linear distortion) into 'true' noise. 
This can greatly improve the subjective quality, and indeed make 
sub-lsb signals audible, but it's only relevant to quantised systems, 
which (presumably?) the human ear is not.
 

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Steve Rencontre               |  steve@dstrip.demon.co.uk (business) 
If it works, it's obsolete.   |  steveren@cix.compulink.co.uk (private)
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