Sampling Only When SNR Is Above Some Limit

[Bret Cahill]

In some situations the time periods when noise will be an issue are
easy to identify. Instead of subtracting or filtering the noise you
use a comparator to simply shut down the noisy signal until the SNR
improves.

This basic approach is possible analogue as well as digital. What is
the name of this method or some key words to get started?


Bret Cahill

 

[whit3rd]

On Aug 3, 9:45 am, Bret Cahill <BretCah...@peoplepc.com> wrote:

In some situations the time periods when noise will be an issue are
easy to identify.

[so, don't measure then]

 What is
the name of this method or some key words to get started?

In the mathematical sense, this is 'statistical weight' in operation.
In signal processing, 'squelch' and 'noise gate' are appropriate
terms.

 

[Joerg]

Bret Cahill wrote:

In some situations the time periods when noise will be an issue are
easy to identify. Instead of subtracting or filtering the noise you
use a comparator to simply shut down the noisy signal until the SNR
improves.

This basic approach is possible analogue as well as digital. What is
the name of this method or some key words to get started?

You don't mean a "noise blanker" as they are called in the RF world?
Technically they often work a bit different, they don't completely cut
the signal.

--
Regards, Joerg

http://www.analogconsultants.com/

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