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    Experimental evaluation of distortion in amplitude modulation techniques for parametric loudspeakers

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    2020060089_MatCompl.zip (1.385Mb)
    Date
    2020
    Author
    San Martín Murugarren, Ricardo Upna
    Tello, Pablo 
    Valencia Leoz, Ana Upna
    Marzo Pérez, Asier Upna
    Version
    Acceso abierto / Sarbide irekia
    xmlui.dri2xhtml.METS-1.0.item-type
    Artículo / Artikulua
    Version
    Versión publicada / Argitaratu den bertsioa
    Project Identifier
    ES/1PE/BIA2016-76957 
    Impact
     
     
     
    10.3390/app10062070
     
     
     
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    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 d ... [++]
    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. [--]
    Subject
    Second-order linear differential equations, Regular singular point, Boundary value problem, Frobenius method, Two-point Taylor expansion
     
    Publisher
    MDPI
    Published in
    Applied Sciences, 2020, 10 (6), 2070
    Departament
    Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa. InaMat - Institute for Advanced Materials / Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa. ISC - Institute of Smart Cities
     
    Publisher version
    https://doi.org/10.3390/app10062070
    URI
    https://hdl.handle.net/2454/37305
    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.
    Appears in Collections
    • Artículos de revista - Aldizkari artikuluak [2947]
    • Artículos de revista ISC - ISC aldizkari artikuluak [208]
    • Artículos de revista InaMat - InaMat aldizkari artikuluak [147]
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