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Re: A Question of Sound?
The practical implimentation is an electronically steerable phased array antenna. Broadcast signal cancels except at the focus. You can drive EMF and make a target vibrate, or broadcast the sound itself.
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Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz4.htm
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