PSN-L Email List Message
Subject: Re: Sensor noise
From: Larry Conklin lconklin@............
Date: Tue, 29 Dec 2009 16:16:14 -0500
It sounds like you've been messing around with something similar to a
project I started but didn't get around to finishing. I added a
waterfall FFT plot to my data logging program, but never finished
debugging it. In part because I wasn't all that confident that the plot
would be worth all that much.
I'd be interested in a little more information regarding how you are
collecting the FFT and some of the design decisions you use (number of
samples in the window, how frequently you do a conversion, etc.) Did
you write your own code or are you using some 3'rd party software?
On 12/29/2009 12:12 AM, Barry Lotz wrote:
> I have successfully used a running fft to sense signal frequency
> component changes and used this as a trigger mechanism for an event.
> Could one use the ( I guess you call it ) power spectrum of the signal
> just before and during the event to remove the noise? I guess you would
> have to use the same time window so the frequencies would compare. Could
> it be a simple subtraction of the "before" from the "during"? This would
> assume that the background noise didn't change in the period during an
> event. This could be better than trying to shape a multi pole filter to
> eliminate the noise. I have found that often a portion of the event
> signal is in the same frequency range as the noise.
Public Seismic Network Mailing List (PSN-L)
[ Top ]
[ Back ]
[ Home Page ]