Construction of an Omnidirectional Parametric Loudspeaker Consisting in a Spherical Distribution of Ultrasound Transducers. - Arnela, Marc; Guasch, Oriol; Sánchez-Martín, Patricia; Camps, Joan; Alsina-Pagès, Rosa Ma; Martínez-Suquía, Carme (Sensors (14248220), 2018)