Realization of an omnidirectional source of sound using parametric loudspeakers

Umut Sayin, Pere Artís, Oriol Guasch

Research output: Indexed journal article Articlepeer-review

25 Citations (Scopus)


Parametric loudspeakers are often used in beam forming applications where a high directivity is required. Withal, in this paper it is proposed to use such devices to build an omnidirectional source of sound. An initial prototype, the omnidirectional parametric loudspeaker (OPL), consisting of a sphere with hundreds of ultrasonic transducers placed on it has been constructed. The OPL emits audible sound thanks to the parametric acoustic array phenomenon, and the close proximity and the large number of transducers results in the generation of a highly omnidirectional sound field. Comparisons with conventional dodecahedron loudspeakers have been made in terms of directivity, frequency response, and in applications such as the generation of diffuse acoustic fields in reverberant chambers. The OPL prototype has performed better than the conventional loudspeaker especially for frequencies higher than 500 Hz, its main drawback being the difficulty to generate intense pressure levels at low frequencies.

Original languageEnglish
Pages (from-to)1899-1907
Number of pages9
JournalJournal of the Acoustical Society of America
Issue number3
Publication statusPublished - Sept 2013


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