PSN-L Email List Message

Subject: Re: FFT Waterfall Display
From: "Geoffrey" gmvoeth@...........
Date: Sat, 14 Jul 2007 03:42:48 -0700

I convert my data to 8 bit mono wav files
and speed them up to about 300X so my
30 minute files will last only 6 seconds or so
but you can hear very clearly the differences
between man made sounds and EQs.
You simply have to understand the headers
to program the conversion.

----- Original Message ----- 
From: "Michael Kimzey" 
Sent: Monday, July 09, 2007 05:23
Subject: Re: FFT Waterfall Display

>>The Cornell Lab of Ornithology offers a free program for displaying
>>waterfall spectrograms of WAVE format sound files, which although intended  
>>for the study of bird songs, would be useful for earthquakes as well.  All 
>>have to do is convert your event files to 16-bit monaural WAVE  format and
>>use Cornell's "Raven Lite 1.0" application. It is free, and can  display
>>spectrograms in color or black-and-white. See:
>>   _
> Ok, so that begs the question, how do we convert an event to a 16 bit wave 
> file?  Actually, this is a question that has more implications, as some 
> gentleman actually took USGS data and did convert it to a wave file, then 
> sped it up and is using it as an art exhibit.  See:
> So, if anyone knows how to convert events, or even WinSDR data to a "wave" 
> file, it can be sped up and I think that one day's worth was approximately 4 
> minutes of sound.
> Interesting.
> - Mike
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