PSN-L Email List Message

Subject: Noise
From: "Randall Pratt" rpratt@.............
Date: Wed, 6 Jul 2011 10:11:49 -0500


I'm following the discussion of Geoff's noise with interest.  I would like
to ask some questions on alias noise.  

 

If one were to vary the sample rate and sample at say 60sps, 40 sps, 15 sps,
6 sps is there a formula to take the peaks from the various ffts and arrive
at a list of probable noise alias problems?   I have done this and can see
some changes in noise peaks on the spectrums but I have not attempted to
calculate a relationship.

 

Secondly, if the AD runs at 120 sps and averages to 6 sps recording rate
will frequencies between 3 and 60 hz alias into the record?

 

Randy

 












I’m following the discussion of Geoff’s = noise with interest.  I would like to ask some questions on alias = noise. 

 

If one were to vary the sample rate and sample at say = 60sps, 40 sps, 15 sps, 6 sps is there a formula to take the peaks from the = various ffts and arrive at a list of probable noise alias problems?   = I have done this and can see some changes in noise peaks on the spectrums but I = have not attempted to calculate a relationship.

 

Secondly, if the AD runs at 120 sps and averages to 6 = sps recording rate will frequencies between 3 and 60 hz alias into the = record?

 

Randy

 


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