PSN-L Email List Message

Subject: Re: tornadoes and earthquake detection
From: "Geoff" gmvoeth@...........
Date: Fri, 2 Dec 2005 15:45:22 -0700

One of the things I sometimes find useful when analyzing long strings of
vibration data is to convert the record into an audio file. In this case,
we'd have to fool the file translator into thinking the sampling rate was
about 1kH or higher rather than your actual slow rate.

Use a wave file and invent a header with a standard sample rate
used by most audio programs then you can convert to any other
file format desired.
I think 44100 samples per second is typical maximum.
I like using 8 bit samples but 16 is also possible.
Try to make one hertz on the gram equal to 100
or more. The human ear is most sensitive to changes
in freq at about 500Hz which is the freq of a typical human whistle.


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