Experimental evaluation of distortion in amplitude modulation techniques for parametric loudspeakers

San Martín Murugarren, Ricardo; Tello Santacana, Pablo; Valencia Leoz, Ana; Marzo Pérez, Asier

Publication:
Experimental evaluation of distortion in amplitude modulation techniques for parametric loudspeakers

dc.contributor.author	San Martín Murugarren, Ricardo
dc.contributor.author	Tello Santacana, Pablo
dc.contributor.author	Valencia Leoz, Ana
dc.contributor.author	Marzo Pérez, Asier
dc.contributor.department	Institute for Advanced Materials and Mathematics - INAMAT2	en
dc.contributor.department	Institute of Smart Cities - ISC	en
dc.contributor.funder	Gobierno de Navarra / Nafarroako Gobernua	es
dc.date.accessioned	2020-07-03T12:54:13Z
dc.date.available	2020-07-03T12:54:13Z
dc.date.issued	2020
dc.description.abstract	Parametric loudspeakers can generate a highly directional beam of sound, having applications in targeted audio delivery. Audible sound modulated into an ultrasonic carrier will get self-demodulated along the highly directive beam due to the non-linearity of air. This non-linear demodularization should be compensated to reduce audio distortion, different amplitude modulation techniques have been developed during the last years. However, some studies are only theoretical whereas others do not analyze the audio distortion in depth. Here, we present a detailed experimental evaluation of the frequency response, harmonic distortion and intermodulation distortion for various amplitude modulation techniques applied with different indices of modulation. We used a simple method to measure the audible signal that prevents the saturation of the microphones when the high levels of the ultrasonic carrier are present. This work could be useful for selecting predistortion techniques and indices of modulation for regular parametric arrays.	en
dc.description.sponsorship	This work has been funded by the Spanish Ministry of Economy and Competitiveness through the R+D+I research project with reference BIA2016-76957-C3-2-R, and by the Government of Navarre through the Technology Transfer project 0011-1365-2019-000086.	en
dc.format.extent	11 p.
dc.format.mimetype	application/pdf	en
dc.format.mimetype	application/zip	en
dc.identifier.doi	10.3390/app10062070
dc.identifier.issn	2076-3417
dc.identifier.uri	https://academica-e.unavarra.es/handle/2454/37305
dc.language.iso	eng	en
dc.publisher	MDPI	en
dc.relation.ispartof	Applied Sciences, 2020, 10 (6), 2070	en
dc.relation.projectID	info:eu-repo/grantAgreement/ES/1PE/BIA2016-76957	en
dc.relation.publisherversion	https://doi.org/10.3390/app10062070
dc.rights	© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.	en
dc.rights.accessRights	info:eu-repo/semantics/openAccess
dc.subject	Second-order linear differential equations	en
dc.subject	Regular singular point	en
dc.subject	Boundary value problem	en
dc.subject	Frobenius method	en
dc.subject	Two-point Taylor expansion	en
dc.title	Experimental evaluation of distortion in amplitude modulation techniques for parametric loudspeakers	en
dc.type	info:eu-repo/semantics/article
dc.type.version	info:eu-repo/semantics/publishedVersion	en
dc.type.version	Versión publicada / Argitaratu den bertsioa	es
dspace.entity.type	Publication
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