Hi All,

I found this site last spring.  It has some good FFT explanation.
http://www.dspguide.com/pdfbook.htm

Randy

----- Original Message -----
From: "Rolando Benitez" 
To: "Psn-L@........... Com" 
Sent: Thursday, August 08, 2002 10:56 PM
Subject: FFT


> Larry et al,
> I am a newcomer -almost- in this list and an apprentice of the earthquakes
> sciences, I have been posting events at the PSN web page since late May,
> having the good fortune to live in the middle of a very active area, I
have
> posted a few. As a beginner I need to learn a lot about many things, I
have
> received wonderful help from several PSN members, thank to them I am
> enjoying this very much. I would like to address some questions to the
group
> looking for some light in the area of what the FFT module of WINQUAKE is,
> I've used the filters in a very practical and blind way, so I have a
slight
> idea of what it can be used for,  but have no clue in the relationship
among
> the period of sensor and the freq of the event and the proximity of quake,
> etc, and the FFT screen, so I really need further assistance. Can someone
> give me some light, please? How can I find some info in the Internet,
book,
> etc.,? Your help would be very appreciated.
> Best regards from Fraijanes, Guatemala.
> Rolando Benitez
>
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