Generating dual beams from a single steerable parametric loudspeaker

The parametric loudspeaker utilizes an ultrasonic transducer array to transmit a directional sound beam in air based on the parametric array effect. In recent studies, phased array techniques have been applied to achieve controllable directivity patterns or to change the direction of the sound beam. Such a parametric loudspeaker is often referred to as a steerable parametric loudspeaker. In this paper, a dual beam generation method is elaborated. It aims to transmit two sound beams from just one steerable parametric loudspeaker. The two sound beams carries the same audio content to different locations. This dual beam generation method is compatible with the configuration of existing steerable parametric loudspeakers based on phased array techniques. As an algorithm solution, the dual beam generation method readily improves the flexibility of the steerable parametric loudspeaker.