Build your own parametric speaker
In this talk I will show you the theory behind parametric arrays what is involved in making your own low-cost directional speaker
Parametric speakers are extremely directional speakers that produce audible sound by modulating an audible signal on top of an ultrasonic carrier. Commercial options have existed for a long time but are quite expensive for hobbyists.
Licensed to the public under http://creativecommons.org/licenses/by/4.0