Construction of an omnidirectional parametric loudspeaker consisting in a spherical distribution of ultrasound transducers

Omnidirectional sound sources are needed to perform a large variety of tests in acoustics. Typically, they consist of conventional speaker drivers arranged in a dodecahedron. However, the directivity of the speaker drivers sharpens with frequency, which induces an intense decrease of the sound press...

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Autores: Arnela, Marc, Guasch Fortuny, Oriol, Sánchez Martín, Patricia|||0000-0001-6937-0155, Camps Dausa, Joan, Alsina Pagès, Rosa Maria, Martínez Suquía, Carmen
Tipo de recurso: artículo
Fecha de publicación:2018
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/422191
Acceso en línea:https://hdl.handle.net/2117/422191
https://dx.doi.org/10.3390/s18124317
Access Level:acceso abierto
Palabra clave:Omnidirectional parametric loudspeaker
Parametric acoustic array
Nonlinear acoustics
Omnidirectional sound source
Ultrasound transduce
Àrees temàtiques de la UPC::Matemàtiques i estadística
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spelling Construction of an omnidirectional parametric loudspeaker consisting in a spherical distribution of ultrasound transducersArnela, MarcGuasch Fortuny, OriolSánchez Martín, Patricia|||0000-0001-6937-0155Camps Dausa, JoanAlsina Pagès, Rosa MariaMartínez Suquía, CarmenOmnidirectional parametric loudspeakerParametric acoustic arrayNonlinear acousticsOmnidirectional sound sourceUltrasound transduceÀrees temàtiques de la UPC::Matemàtiques i estadísticaOmnidirectional sound sources are needed to perform a large variety of tests in acoustics. Typically, they consist of conventional speaker drivers arranged in a dodecahedron. However, the directivity of the speaker drivers sharpens with frequency, which induces an intense decrease of the sound pressure levels at the edges of the dodechaedron. In this work, the problem is mitigated by building an Omnidirectional Parametric Loudspeaker (OPL), which contains hundreds of small ultrasound transducers set on a sphere. Each transducer emits an ultrasonic carrier wave modulated by an audible signal. Thanks to nonlinear propagation, the air itself demodulates the signal bringing it back to the audible range. The construction of an OPL prototype is challenging. The structure has been built by 3D-printing a set of pieces that conform to the sphere. Each piece contains the exact location of the transducers, which are aligned in parallels to facilitate the structural assembly and the wiring. The performance of the OPL has been tested in an anechoic chamber. Measurements show that the OPL has a good omnidirectional behavior for most frequencies. It clearly improves the directivity of dodechaedral sources in the high frequency range, but performs worse at low frequencies.Multidisciplinary Digital Publishing Institute (MDPI)20182018-12-0720252025-01-20journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/422191https://dx.doi.org/10.3390/s18124317reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/4221912026-05-27T15:37:01Z
dc.title.none.fl_str_mv Construction of an omnidirectional parametric loudspeaker consisting in a spherical distribution of ultrasound transducers
title Construction of an omnidirectional parametric loudspeaker consisting in a spherical distribution of ultrasound transducers
spellingShingle Construction of an omnidirectional parametric loudspeaker consisting in a spherical distribution of ultrasound transducers
Arnela, Marc
Omnidirectional parametric loudspeaker
Parametric acoustic array
Nonlinear acoustics
Omnidirectional sound source
Ultrasound transduce
Àrees temàtiques de la UPC::Matemàtiques i estadística
title_short Construction of an omnidirectional parametric loudspeaker consisting in a spherical distribution of ultrasound transducers
title_full Construction of an omnidirectional parametric loudspeaker consisting in a spherical distribution of ultrasound transducers
title_fullStr Construction of an omnidirectional parametric loudspeaker consisting in a spherical distribution of ultrasound transducers
title_full_unstemmed Construction of an omnidirectional parametric loudspeaker consisting in a spherical distribution of ultrasound transducers
title_sort Construction of an omnidirectional parametric loudspeaker consisting in a spherical distribution of ultrasound transducers
dc.creator.none.fl_str_mv Arnela, Marc
Guasch Fortuny, Oriol
Sánchez Martín, Patricia|||0000-0001-6937-0155
Camps Dausa, Joan
Alsina Pagès, Rosa Maria
Martínez Suquía, Carmen
author Arnela, Marc
author_facet Arnela, Marc
Guasch Fortuny, Oriol
Sánchez Martín, Patricia|||0000-0001-6937-0155
Camps Dausa, Joan
Alsina Pagès, Rosa Maria
Martínez Suquía, Carmen
author_role author
author2 Guasch Fortuny, Oriol
Sánchez Martín, Patricia|||0000-0001-6937-0155
Camps Dausa, Joan
Alsina Pagès, Rosa Maria
Martínez Suquía, Carmen
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Omnidirectional parametric loudspeaker
Parametric acoustic array
Nonlinear acoustics
Omnidirectional sound source
Ultrasound transduce
Àrees temàtiques de la UPC::Matemàtiques i estadística
topic Omnidirectional parametric loudspeaker
Parametric acoustic array
Nonlinear acoustics
Omnidirectional sound source
Ultrasound transduce
Àrees temàtiques de la UPC::Matemàtiques i estadística
description Omnidirectional sound sources are needed to perform a large variety of tests in acoustics. Typically, they consist of conventional speaker drivers arranged in a dodecahedron. However, the directivity of the speaker drivers sharpens with frequency, which induces an intense decrease of the sound pressure levels at the edges of the dodechaedron. In this work, the problem is mitigated by building an Omnidirectional Parametric Loudspeaker (OPL), which contains hundreds of small ultrasound transducers set on a sphere. Each transducer emits an ultrasonic carrier wave modulated by an audible signal. Thanks to nonlinear propagation, the air itself demodulates the signal bringing it back to the audible range. The construction of an OPL prototype is challenging. The structure has been built by 3D-printing a set of pieces that conform to the sphere. Each piece contains the exact location of the transducers, which are aligned in parallels to facilitate the structural assembly and the wiring. The performance of the OPL has been tested in an anechoic chamber. Measurements show that the OPL has a good omnidirectional behavior for most frequencies. It clearly improves the directivity of dodechaedral sources in the high frequency range, but performs worse at low frequencies.
publishDate 2018
dc.date.none.fl_str_mv 2018
2018-12-07
2025
2025-01-20
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/422191
https://dx.doi.org/10.3390/s18124317
url https://hdl.handle.net/2117/422191
https://dx.doi.org/10.3390/s18124317
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute (MDPI)
publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute (MDPI)
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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