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dc.creatorSan Martín Murugarren, Ricardoes_ES
dc.creatorTello, Pabloes_ES
dc.creatorValencia Leoz, Anaes_ES
dc.creatorMarzo Pérez, Asieres_ES
dc.date.accessioned2020-07-03T12:54:13Z
dc.date.available2020-07-03T12:54:13Z
dc.date.issued2020
dc.identifier.issn2076-3417
dc.identifier.urihttps://hdl.handle.net/2454/37305
dc.description.abstractParametric 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.sponsorshipThis 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.extent11 p.
dc.format.mimetypeapplication/pdfen
dc.format.mimetypeapplication/zipen
dc.language.isoengen
dc.publisherMDPIen
dc.relation.ispartofApplied Sciences, 2020, 10 (6), 2070en
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.subjectSecond-order linear differential equationsen
dc.subjectRegular singular pointen
dc.subjectBoundary value problemen
dc.subjectFrobenius methoden
dc.subjectTwo-point Taylor expansionen
dc.titleExperimental evaluation of distortion in amplitude modulation techniques for parametric loudspeakersen
dc.typeinfo:eu-repo/semantics/articleen
dc.typeArtículo / Artikuluaes
dc.contributor.departmentUniversidad Pública de Navarra / Nafarroako Unibertsitate Publikoa. InaMat - Institute for Advanced Materialses_ES
dc.contributor.departmentUniversidad Pública de Navarra / Nafarroako Unibertsitate Publikoa. ISC - Institute of Smart Citieses_ES
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessen
dc.rights.accessRightsAcceso abierto / Sarbide irekiaes
dc.identifier.doi10.3390/app10062070
dc.relation.projectIDinfo:eu-repo/grantAgreement/ES/1PE/BIA2016-76957en
dc.relation.publisherversionhttps://doi.org/10.3390/app10062070
dc.type.versioninfo:eu-repo/semantics/publishedVersionen
dc.type.versionVersión publicada / Argitaratu den bertsioaes
dc.contributor.funderGobierno de Navarra / Nafarroako Gobernuaes


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