Superdirectional Parametric Array Loudspeaker

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In this work, a directional loudspeaker, also known as a parametric array loudspeaker (PAL), is designed and constructed. The operation is based on the phenomenon called self-demodulation that happens when high-frequency beams interact in a viscous medium, due to its non-linear properties. The sound...

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Autores principales:	Montes de Oca, Axel, Verne, Santiago, Vechiatti, Nilda, Muravchik, Carlos
Formato:	Artículo publishedVersion
Lenguaje:	Español
Publicado:	FIUBA 2019
Materias:	parametric array directional speaker Parlante Direccional Matriz paramétrica
Acceso en línea:	https://elektron.fi.uba.ar/elektron/article/view/56 https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=elektron&d=56_oai
Aporte de:	Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires

id	I28-R145-56_oai
record_format	dspace
spelling	I28-R145-56_oai2026-02-11 Montes de Oca, Axel Verne, Santiago Vechiatti, Nilda Muravchik, Carlos 2019-12-15 In this work, a directional loudspeaker, also known as a parametric array loudspeaker (PAL), is designed and constructed. The operation is based on the phenomenon called self-demodulation that happens when high-frequency beams interact in a viscous medium, due to its non-linear properties. The sound obtained after the self-demodulation is formed in the beam of the ultrasonic carrier signal propagating beyond the absorption distance in which the carrier has been sufficiently attenuated. This generates a focused audible signal and therefore a directional polar pattern of narrow angle. In this paper two modulation methods are evaluated: double-sideband amplitude (AM-DBL) and pulse-width modulation (PWM). Its effect on directionality, sound pressure level and harmonic distortion is experimentally analyzed. Este trabajo trata sobre el diseño y construcción de un altoparlante direccional, también conocido como parlante de matriz paramétrica (PAL). El funcionamiento del mismo se basa en los principios de un fenómeno denominado autodemodulación que sucede cuando haces de alta frecuencia interactúan en un medio viscoso, debido a las propiedades no lineales del mismo. El sonido obtenido luego de la autodemodulación se forma en el haz de la señal portadora ultrasónica propagándose más allá de la distancia en la que la portadora ha sido suficientemente atenuada. Esto genera una señal audible focalizada y por ende un patrón polar direccional de ángulo angosto. En el presente trabajo se evalúan dos métodos de modulación: en amplitud con doble banda lateral (AM-DBL) y por variación de ancho de pulso (PWM). Se analiza experimentalmente su efecto en la direccionalidad, nivel de presión sonora y distorsión armónica. application/pdf text/html https://elektron.fi.uba.ar/elektron/article/view/56 10.37537/rev.elektron.3.2.56.2019 spa FIUBA https://elektron.fi.uba.ar/elektron/article/view/56/113 https://elektron.fi.uba.ar/elektron/article/view/56/133 Derechos de autor 2019 Axel Montes de Oca, Santiago Verne, Nilda Vechiatti, Carlos Muravchik Elektron Journal; Vol. 3 No. 2 (2019); 58-66 Revista Elektron; Vol. 3 Núm. 2 (2019); 58-66 Revista Elektron; v. 3 n. 2 (2019); 58-66 2525-0159 2525-0159 parametric array directional speaker Parlante Direccional Matriz paramétrica Superdirectional Parametric Array Loudspeaker Parlante superdireccional de matriz paramétrica info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=elektron&d=56_oai
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-145
collection	Repositorio Digital de la Universidad de Buenos Aires (UBA)
language	Español
orig_language_str_mv	spa
topic	parametric array directional speaker Parlante Direccional Matriz paramétrica
spellingShingle	parametric array directional speaker Parlante Direccional Matriz paramétrica Montes de Oca, Axel Verne, Santiago Vechiatti, Nilda Muravchik, Carlos Superdirectional Parametric Array Loudspeaker
topic_facet	parametric array directional speaker Parlante Direccional Matriz paramétrica
description	In this work, a directional loudspeaker, also known as a parametric array loudspeaker (PAL), is designed and constructed. The operation is based on the phenomenon called self-demodulation that happens when high-frequency beams interact in a viscous medium, due to its non-linear properties. The sound obtained after the self-demodulation is formed in the beam of the ultrasonic carrier signal propagating beyond the absorption distance in which the carrier has been sufficiently attenuated. This generates a focused audible signal and therefore a directional polar pattern of narrow angle. In this paper two modulation methods are evaluated: double-sideband amplitude (AM-DBL) and pulse-width modulation (PWM). Its effect on directionality, sound pressure level and harmonic distortion is experimentally analyzed.
format	Artículo publishedVersion
author	Montes de Oca, Axel Verne, Santiago Vechiatti, Nilda Muravchik, Carlos
author_facet	Montes de Oca, Axel Verne, Santiago Vechiatti, Nilda Muravchik, Carlos
author_sort	Montes de Oca, Axel
title	Superdirectional Parametric Array Loudspeaker
title_short	Superdirectional Parametric Array Loudspeaker
title_full	Superdirectional Parametric Array Loudspeaker
title_fullStr	Superdirectional Parametric Array Loudspeaker
title_full_unstemmed	Superdirectional Parametric Array Loudspeaker
title_sort	superdirectional parametric array loudspeaker
publisher	FIUBA
publishDate	2019
url	https://elektron.fi.uba.ar/elektron/article/view/56 https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=elektron&d=56_oai
work_keys_str_mv	AT montesdeocaaxel superdirectionalparametricarrayloudspeaker AT vernesantiago superdirectionalparametricarrayloudspeaker AT vechiattinilda superdirectionalparametricarrayloudspeaker AT muravchikcarlos superdirectionalparametricarrayloudspeaker AT montesdeocaaxel parlantesuperdireccionaldematrizparametrica AT vernesantiago parlantesuperdireccionaldematrizparametrica AT vechiattinilda parlantesuperdireccionaldematrizparametrica AT muravchikcarlos parlantesuperdireccionaldematrizparametrica
_version_	1857042998199582720

Superdirectional Parametric Array Loudspeaker

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