From: Alex (alex@glx.net)
Date: Tue Aug 17 2004 - 17:38:46 PDT
Awfully difficult to do this with a mic close range (near field) at the
frequencies you're probably interested in. Probably the best thing is
what the other guys suggested, a contact stethoscope... ($5.00 @ Harbor
Freight)
http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=41966
The reason it's difficult, aside from the hideous masking noises
present, is how we directionalize low frequency sounds.
Alex
PS... for those who need help falling asleep..
http://interface.cipic.ucdavis.edu/CIL_tutorial/3D_psych/3D_psych.htm
-----Original Message-----
From: Military Vehicles Mailing List [mailto:mil-veh@mil-veh.org] On
Behalf Of Bjorn Brandstedt
Sent: Tuesday, August 17, 2004 12:16 PM
To: Military Vehicles Mailing List
Subject: [MV] Diagnosing engine compartment noises
Is there such a thing as a highly directional microphone that can be
used
for pinpointing sound sources within an engine compartment? Sometimes
it's
hard to tell where a particular sound comes from. Being able to isolate
the
sounds from each and every component could be very helpful.
Just thinking out loud.
Bjorn
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