Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
References: <3DB41488.email@example.com> <3DB43497.A32B8380@webaccess.net> <3DB45343.E61C1CCB@webaccess.net> <3DB466BC.593D4D35@webaccess.net>
Subject: Re: How does a mixer work?
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Date: Wed, 23 Oct 2002 20:11:24 +0100
NNTP-Posting-Date: Wed, 23 Oct 2002 20:11:45 BST
"John Woodgate" wrote in message
> I read in sci.electronics.design that James Meyer
> wrote (in
firstname.lastname@example.org>) about 'How does a mixer work?', on Wed, 23 Oct 2002:
> > Correct! Since a Dirac pulse contains all the information
> >which will be known; all the transmissions that have ever been
produced, or will
> >be produced, are redundant.
> Well, not quite correct, because no-one has ever produced a Dirac
> We are waiting for some transistors with infinite Vcbo. (;-)
Well, not even that. A dirac pulse contains no useful information. Its
certainly true that for a signal to have information content it must
have some randomness associated with it, i.e. log2(/pi), and that as a
consequence, a random signal has a frequency spectrum. It does not
necessarily follow that anything with a complete spectrum contains
useful information. White noise, is just that, white noise.
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