Measurement of the sound absorption coefficient of materials in a reverberant chamber using an omnidirectional parametric loudspeaker

The omnidirectional parametric loudspeaker (OPL) is a sound source that exploits the phenomenon of the parametric acoustic array (PAA) to produce an omnidirectional sound field. It consists of hundreds of ultrasound transducers distributed on the surface of a sphere. Each transducer emits an ultraso...

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Detalhes bibliográficos
Autores: Martinez-Suquia, Carme, Arnela, Marc, Guasch, Oriol
Formato: artículo
Fecha de publicación:2023
País:España
Recursos:Universitat Ramon Llull (URL)
Repositorio:DAU Arxiu Digital de la Universitat Ramon Llull
OAI Identifier:oai:dau.url.edu:20.500.14342/5682
Acesso em linha:http://hdl.handle.net/20.500.14342/5682
Access Level:acceso abierto
Palavra-chave:Room acoustics
Reverberation time
Parametric acoustic array
Omnidirectional parametric loudspeaker
Exponential sine sweep
53
531/534
62
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oai_identifier_str oai:dau.url.edu:20.500.14342/5682
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spelling Measurement of the sound absorption coefficient of materials in a reverberant chamber using an omnidirectional parametric loudspeakerMartinez-Suquia, CarmeArnela, MarcGuasch, OriolRoom acousticsReverberation timeParametric acoustic arrayOmnidirectional parametric loudspeakerExponential sine sweep53531/53462The omnidirectional parametric loudspeaker (OPL) is a sound source that exploits the phenomenon of the parametric acoustic array (PAA) to produce an omnidirectional sound field. It consists of hundreds of ultrasound transducers distributed on the surface of a sphere. Each transducer emits an ultrasonic signal modulated in amplitude by an audible exponential sweep sine (ESS). The signal is demodulated back to the audible range by nonlinear propagation in air. This work investigates the suitability of the OPL for some room acoustics measurements. We focus on measuring the sound absorption coefficient of materials in a reverberant chamber. In fact, the study proposes the first steps towards a methodology to measure the absorption coefficient of materials, similar to ISO 354 standard, but for an OPL. The ESS is used as excitation signal because it allows the OPL to concentrate the emitted sound power on a single frequency, leading to higher ultrasonic power levels and increasing the signal-to-noise ratio of the audible sound pressure levels. The procedure for obtaining the frequency dependent reverberation times is also described. The absorption coefficient and reverberation times measured with the OPL are compared with those of conventional dodecahedral loudspeakerinfo:eu-repo/semantics/publishedVersionUniversitat Ramon Llull. La Salle2025202520232023info:eu-repo/semantics/article6 p.application/pdfhttp://hdl.handle.net/20.500.14342/5682reponame:DAU Arxiu Digital de la Universitat Ramon Llullinstname:Universitat Ramon Llull (URL)InglésProceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023© L'autor/aAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:dau.url.edu:20.500.14342/56822026-06-21T06:40:37Z
dc.title.none.fl_str_mv Measurement of the sound absorption coefficient of materials in a reverberant chamber using an omnidirectional parametric loudspeaker
title Measurement of the sound absorption coefficient of materials in a reverberant chamber using an omnidirectional parametric loudspeaker
spellingShingle Measurement of the sound absorption coefficient of materials in a reverberant chamber using an omnidirectional parametric loudspeaker
Martinez-Suquia, Carme
Room acoustics
Reverberation time
Parametric acoustic array
Omnidirectional parametric loudspeaker
Exponential sine sweep
53
531/534
62
title_short Measurement of the sound absorption coefficient of materials in a reverberant chamber using an omnidirectional parametric loudspeaker
title_full Measurement of the sound absorption coefficient of materials in a reverberant chamber using an omnidirectional parametric loudspeaker
title_fullStr Measurement of the sound absorption coefficient of materials in a reverberant chamber using an omnidirectional parametric loudspeaker
title_full_unstemmed Measurement of the sound absorption coefficient of materials in a reverberant chamber using an omnidirectional parametric loudspeaker
title_sort Measurement of the sound absorption coefficient of materials in a reverberant chamber using an omnidirectional parametric loudspeaker
dc.creator.none.fl_str_mv Martinez-Suquia, Carme
Arnela, Marc
Guasch, Oriol
author Martinez-Suquia, Carme
author_facet Martinez-Suquia, Carme
Arnela, Marc
Guasch, Oriol
author_role author
author2 Arnela, Marc
Guasch, Oriol
author2_role author
author
dc.contributor.none.fl_str_mv Universitat Ramon Llull. La Salle
dc.subject.none.fl_str_mv Room acoustics
Reverberation time
Parametric acoustic array
Omnidirectional parametric loudspeaker
Exponential sine sweep
53
531/534
62
topic Room acoustics
Reverberation time
Parametric acoustic array
Omnidirectional parametric loudspeaker
Exponential sine sweep
53
531/534
62
description The omnidirectional parametric loudspeaker (OPL) is a sound source that exploits the phenomenon of the parametric acoustic array (PAA) to produce an omnidirectional sound field. It consists of hundreds of ultrasound transducers distributed on the surface of a sphere. Each transducer emits an ultrasonic signal modulated in amplitude by an audible exponential sweep sine (ESS). The signal is demodulated back to the audible range by nonlinear propagation in air. This work investigates the suitability of the OPL for some room acoustics measurements. We focus on measuring the sound absorption coefficient of materials in a reverberant chamber. In fact, the study proposes the first steps towards a methodology to measure the absorption coefficient of materials, similar to ISO 354 standard, but for an OPL. The ESS is used as excitation signal because it allows the OPL to concentrate the emitted sound power on a single frequency, leading to higher ultrasonic power levels and increasing the signal-to-noise ratio of the audible sound pressure levels. The procedure for obtaining the frequency dependent reverberation times is also described. The absorption coefficient and reverberation times measured with the OPL are compared with those of conventional dodecahedral loudspeaker
publishDate 2023
dc.date.none.fl_str_mv 2023
2023
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/20.500.14342/5682
url http://hdl.handle.net/20.500.14342/5682
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023
dc.rights.none.fl_str_mv © L'autor/a
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv © L'autor/a
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 6 p.
application/pdf
dc.source.none.fl_str_mv reponame:DAU Arxiu Digital de la Universitat Ramon Llull
instname:Universitat Ramon Llull (URL)
instname_str Universitat Ramon Llull (URL)
reponame_str DAU Arxiu Digital de la Universitat Ramon Llull
collection DAU Arxiu Digital de la Universitat Ramon Llull
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.811543

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