Sampling Only When SNR > Some Limit
in [DSP]
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From: Bret Cahill on 3 Aug 2010 12:34 Subtracting or otherwise filtering noise isn't always all that convenient at low SNR If you know when noise is going to be an issue it could be much easier to take a little more time and simply switching off the noisy signal when the SNR is below a certain limit. What is the name and for this approach? Since this can be done analogue as well as digital some keywords for the basics would help. Bret Cahill
From: Vladimir Vassilevsky on 3 Aug 2010 12:37 Bret Cahill wrote: > Subtracting or otherwise filtering noise isn't always all that > convenient at low SNR > > If you know when noise is going to be an issue it could be much easier > to take a little more time and simply switching off the noisy signal > when the SNR is below a certain limit. > > What is the name and for this approach? Blanking. VLV
From: Steve Pope on 3 Aug 2010 12:47 Bret Cahill <BretCahill(a)peoplepc.com> wrote: >Subtracting or otherwise filtering noise isn't always all that >convenient at low SNR > >If you know when noise is going to be an issue it could be much easier >to take a little more time and simply switching off the noisy signal >when the SNR is below a certain limit. > >What is the name and for this approach? It's called a "squelch". It's as old as the hills. In an audio context, it is a "noise gate". Steve
From: Eric Jacobsen on 3 Aug 2010 12:54 On Tue, 03 Aug 2010 11:37:08 -0500, Vladimir Vassilevsky <nospam(a)nowhere.com> wrote: > > >Bret Cahill wrote: > >> Subtracting or otherwise filtering noise isn't always all that >> convenient at low SNR >> >> If you know when noise is going to be an issue it could be much easier >> to take a little more time and simply switching off the noisy signal >> when the SNR is below a certain limit. >> >> What is the name and for this approach? > >Blanking. > >VLV Or Squelch. Eric Jacobsen Minister of Algorithms Abineau Communications http://www.abineau.com
From: Steve Pope on 3 Aug 2010 12:56
Eric Jacobsen <eric.jacobsen(a)ieee.org> wrote: >On Tue, 03 Aug 2010 11:37:08 -0500, Vladimir Vassilevsky >>Blanking. >Or Squelch. There's an echo in here! Audio: noise gate Video: blanking Radio: squelch Journalism: "cut that s--- out!" Steve |