In this paper we deal with some practical issues that one can encounter when building a parametric loudspeaker with ultrasonic piezoelectric emitters. We measured several of those transducers (with resonance frequency 40 kHz) available on the market, observing a strong nonlinear behavior of many of them. We also tested a hundred of piezoelectric emitters of the same series and studied the influence of the standard deviation of the resonance frequency and the sensitivity on the performance of the parametric loudspeaker. We conclude that, when constructing a parametric loudspeaker with low-cost piezoelectric emitters, the individual behavior of each of them should be considered. This allows to minimize the effect of their differences and, thus, improve the quality of the sound generated.

Authors: Cadavid, Jose; Novak, Antonin
Affiliations: Université du Mans, Le Mans, France(See document for exact affiliation information.)
AES Convention: 146 (March 2019) Paper Number: 10145
Publication Date: March 10, 2019
Subject: Poster Session 1

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