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Re: Topband: Signals in noise

To: topband@contesting.com
Subject: Re: Topband: Signals in noise
From: Bob Eldridge <r.c.eldridge@ieee.org>
Date: Mon, 29 Mar 2004 21:50:32 -0800
List-post: <mailto:topband@contesting.com>
Hi Jerry:
Tried to send this privately, but Earthlink dumped it in your "suspect" box.

At 10:09 2004-03-27 -0800, you wrote:
There is an interesting article in Chinese Physics Letters Vol. 21, No. 4,
p. 757 regarding enhancing detection of single tones by adding noise.

Jerry:
Indeed an interesting article. But it seems to me it refers to making a very low amplitude signal (one too weak to hear, not one too masked by QRN) audible by bringing the totality up to perceptible level. Not by winkling out a signal that is buried in noise by adding white noise to the S + N.
I have adjustable level white noise on the Hildreth filter, and sometimes use it to mask intelligible weak QRM. I haven't really tried reducing the audio to almost imperceptible level before adding the white noise, but I will. It makes sense that white noise modulated by the signal will be perceptible, and I have to find out what it sounds like.
It may be like hearing your callsign in the wind.


Bob VE7BS

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