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parabolic T mic and phase invert noise reduction

Subject: parabolic T mic and phase invert noise reduction
From: "Rich Peet" <>
Date: Thu, 30 Dec 2004 22:23:21 -0000
Still working with the parabolic mic configurations.
Rough photo and sound to illustrate only.

As a hybred between barrier and a no barrier stereo mic method used in
parabolic dishes, I constructed a T mic using the 183 elements.

Pictured without foam wind screens as seen through the dish.
http://home.comcast.net/~richpeet/q1t.jpg

Sound when focused at bird seed on the ground with quiet visiting
redpolls and pine grosbeaks at about 100feet. Note the sound of the
logging equipment a few miles away.
1.5 meg download
http://home.comcast.net/~richpeet/183t.mp3

First segment of three is the raw stereo track.

Second segment is a mono track made by combining the two stereo channels.

Third segment is a mono track with one channel phase inverted prior to
combining the two stereo tracks.

I thinik it does a pretty good job of reducing the logging background
noise. Of course it can not reduce the background noise more than the
actual gain of the dish itself.

Rich







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