To: | topband@contesting.com |
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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 _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting.com/mailman/listinfo/topband |
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