Parametric Array loudspeakers can generate a sound beam using nonlinear acoustic interactions, widely known as “Parametric Array,” that can enable private listening in a public area. Parametric array loudspeakers can be applied to many applications, such as information technology devices, that require a high power efficiency and wide bandwidth. In a previous study, a piezoelectric micro-machined ultrasonic transducer (PMUT) is shown to be an efficient unit for a parametric array loudspeaker. In this paper we will describe realization of a parametric array loudspeaker with high power efficiency (up to 71%) and wide flat radiation bandwidth (19.5 kHz, difference frequency wave with equalization), which consists of an array of PMUTs with two resonance frequencies (f1 = 100 kHz, f2 = 110 kHz) and use of “out-of-phase” driving techniques.

Authors: Been, Kyounghun; Hwang, Younghwan; Je, Yub; Lee, Haksue; Moon, Wonkyu
Affiliations: POSTECH, Gyeongsangbuk-do, Korea; Agency for Defense Development, Gyeongsangnam-do, Korea(See document for exact affiliation information.)
AES Convention: 138 (May 2015) Paper Number: 9314
Publication Date: May 6, 2015 Import into BibTeX
Subject: Transducers
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=17738

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