I posted a link to this way back.
In the light of recent noise legislation on both sides of the pond is it worth another look?
http://www.woodynorris.com/Articles/USAToday2.htm
ETA: Audio spotlight http://www.holosonics.com/technology.html
The idea is to modulate an ultrasonic carrier wave with the audible frequencies required - say the audible sounds from an electric motor in the rear of the vehicle.
In the light of recent noise legislation on both sides of the pond is it worth another look?
http://www.woodynorris.com/Articles/USAToday2.htm
ETA: Audio spotlight http://www.holosonics.com/technology.html
The idea is to modulate an ultrasonic carrier wave with the audible frequencies required - say the audible sounds from an electric motor in the rear of the vehicle.
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