From: Bret Cahill on
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


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
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
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
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