Patent ID: 9036827
Filing Date: 2015-05-19
Classification: G10K,H04R

Abstract:
1. A method of selectively transmitting audio signals to a selected location, the method comprising the steps of: (a) modulating an ultrasonic carrier with at least one audio signal to form a modulated carrier, the frequency of the ultrasonic carrier being sufficiently high that all of the components of the modulated carrier have frequencies above the range in which the human auditory system responds; and (b) directing a beam containing the modulated carrier toward the selected location, whereby the audio signal appears to emanate therefrom or is confined thereto, wherein the carrier is generated by at least one ultrasonic transducer, and the ultrasonic transducer has a triangular response centered on the frequency of the ultrasonic carrier, and the method further comprises employing a re-emphasis filter to correct for non-uniform transducer response.