56 research outputs found
Supplemental material for Relationship Between Auditory Context and Visual Distance Perception: Effect of Musical Expertise in the Ability to Translate Reverberation Cues Into Room-Size Perception
No full textSupplemental material for Relationship Between Auditory Context and Visual Distance Perception: Effect of Musical Expertise in the Ability to Translate Reverberation Cues Into Room-Size Perception by Pablo E. Etchemendy, Ignacio Spiousas and Ramiro Vergara in Perception</p
Directional impulse response of a large cavity inside a sonic crystal
No full textBoth temporal and directional responses of a cavity inside a two-dimensional sonic crystal are investigated. The size of the cavity is large compared to the lattice parameter and the wavelength for the frequency range of interest. Hence, a hybrid method to compute the response is proposed, combining multiscattering theory for the calculation of the reflective properties of the sonic crystal with a modified ray-tracing algorithm for the sound propagation within the cavity. The response of this enclosure displays resonances for certain frequency bands that depend on the geometry of the lattice and the cavity. When a full band gap exists in the sonic crystal, rays cannot propagate through the medium and total reflection occurs for all incidence angles, leading to strong resonances with an isotropic intensity field inside the cavity. When only some propagation directions are forbidden, total reflection occurs for certain ranges of incidence angles, and resonances can also be elicited but with a highly anisotropic intensity field. The spectrum of resonances of the cavity is strongly affected by changes in the lattice geometry, suggesting that they can be tailored to some extent, a feature that can lead to potential applications in architectural acoustics.Fil: Spiousas, Ignacio. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Acústica y Percepción Sonora; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Eguia, Manuel Camilo. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Acústica y Percepción Sonora; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Aplicaciones de cristales sónicos a cavidades resonantes y localización de fuentes sonoras
No full textFil: Spiousas, Ignacio. Universidad Nacional de Quilmes. Departamento de Ciencias Sociales. Laboratorio de Acústica y Percepción Sonora (LAPSo); Argentina.La hipótesis que se plantea en esta tesis es que la introducción de metamateriales acústicos puede, a través de sus propiedades de transmisión y reflexión, modificar el campo sonoro de forma controlada y predecible y afectar a la percepción espacial de las fuentes de sonido. La elección de los metamateriales para la resolución de este problema responde a que los mismos presentan un comportamiento dinámico diferente del exhibido por los materiales ordinarios. Estos comportamientos incluyen focalización de sonido y efectos de filtrado altamente dependientes del espacio y la frecuencia.
A partir de la idea de controlar la acústica de un recinto utilizando cristales sónicos es que se define el primer objetivo de esta tesis: estudiar las propiedades de reflexión de los cristales sónicos y su aplicación a la acústica de cavidades, resonadores y salas. En particular, se propone utilizar un modelo simple, una cavidad rectangular dentro de un cristal sónico, para comprender el efecto de la estructura cristalina en la respuesta temporal y espectral de la cavidad.
El segundo objetivo consiste en analizar el efecto en la percepción auditiva de distancia al
colocar un cristal sónico entre una fuente sonora y un oyente. Para llevar a cabo este estudio se analizan los cambios en la percepción espacial auditiva, y en las claves acústicas relacionadas con ella, al introducir un módulo de cristal sónico entre una fuente sonora y un sujeto experimental. De esta manera, buscamos comprender las posibilidades y limitaciones de utilizar esta alternativa para controlar la localización de una fuente sonora utilizando sólo medios acústicos
Data from "Moonstruck sleep: Synchronization of Human Sleep with the Moon Cycle under Field Conditions"
No full textData from the paper:
"Moonstruck sleep: Synchronization of Human Sleep with the Moon Cycle under Field Conditions"
Science Advances, January 2021
Authors: Leandro Casiraghi, Ignacio Spiousas, Gideon P. Dunster, Kaitlyn McGlothlen, Eduardo Fernández-Duque, Claudia Valeggia & Horacio O. de la Iglesi
Data from "Moonstruck sleep: Synchronization of Human Sleep with the Moon Cycle under Field Conditions"
No full textData from the paper:
"Moonstruck sleep: Synchronization of Human Sleep with the Moon Cycle under Field Conditions"
Science Advances, January 2021
Authors: Leandro Casiraghi, Ignacio Spiousas, Gideon P. Dunster, Kaitlyn McGlothlen, Eduardo Fernández-Duque, Claudia Valeggia & Horacio O. de la Iglesi
Data from "Moonstruck sleep: Synchronization of Human Sleep with the Moon Cycle under Field Conditions"
No full textData from the paper:
"Moonstruck sleep: Synchronization of Human Sleep with the Moon Cycle under Field Conditions"
Science Advances, January 2021
Authors: Leandro Casiraghi, Ignacio Spiousas, Gideon P. Dunster, Kaitlyn McGlothlen, Eduardo Fernández-Duque, Claudia Valeggia & Horacio O. de la Iglesi
Relationship Between Auditory Context and Visual Distance Perception: Effect of Musical Expertise in the Ability to Translate Reverberation Cues Into Room-Size Perception
No full textIn a recently published work by our group [Scientific Reports, 7, 7189 (2017)], we performed experiments of visual distance perception in two dark rooms with extremely different reverberation times: one anechoic (T ∼ 0.12 s) and the other reverberant (T ∼ 4 s). The perceived distance of the targets was systematically greater in the reverberant room when contrasted to the anechoic chamber. Participants also provided auditorily perceived room-size ratings which were greater for the reverberant room. Our hypothesis was that distance estimates are affected by room size, resulting in farther responses for the room perceived larger. Of much importance to the task was the subjects’ ability to infer room size from reverberation. In this article, we report a postanalysis showing that participants having musical expertise were better able to extract and translate reverberation cues into room-size information than nonmusicians. However, the degree to which musical expertise affects visual distance estimates remains unclear.Fil: Etchemendy, Pablo Esteban. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Acústica y Percepción Sonora; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Spiousas, Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. McGill University; Canadá. Douglas Mental Health University Institute; CanadáFil: Vergara, Ramiro Oscar. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Acústica y Percepción Sonora; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Time reversal focusing in the audible range using a tunable sonic crystal
No full textTime reversal (TR) focusing of acoustical waves is a widely studied phenomenon that usually requires a chaotic cavity or disordered scattering medium to achieve spatial and frequency decorrelation of the acoustic field when using a single channel. On the other hand, sonic crystals were disregarded as scattering media for the TR process because of their periodic structure and previous results showing poor spatial focusing when compared to a disordered medium. In this paper, an experimental realization of a tunable sonic crystal, which can achieve single-channel TR focusing amplitudes in the audible range comparable to those obtained in a disordered scattering medium, is presented. Furthermore, the tunable nature of the system allows it to switch the time-reversed pulse on and off by changing its geometrical configuration. A robustness analysis with respect to the perturbations in the sonic crystal configurations is also presented, showing that the time-reversed pulses with high temporal and spatial contrasts are preserved only for configurations that are close to the original one.Fil: Gomez, Valeria Sol. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Acústica y Percepción Sonora; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas; ArgentinaFil: Spiousas, Ignacio. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Acústica y Percepción Sonora; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Eguia, Manuel Camilo. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Acústica y Percepción Sonora; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Broadband resonant cavity inside a two-dimensional sonic crystal
No full textA rectangular cavity inside a two-dimensional sonic crystal was theoretically and experimentally characterized by examining its response to a cylindrical source emitting narrow-band filtered noise bursts with central frequencies ranging from 2 to 12 kHz. A broadband intensity resonance was observed for frequencies within the full band-gap region of the sonic crystal (5.5–6.5 kHz). Unlike ordinary resonances, this broadband resonance depends on the reflection properties of the sonic crystal forming the surrounding walls rather than on the geometry of the cavity.Fil: Alberti, Alejo. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Acústica y Percepción Sonora; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Gomez, Pablo M.. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Electronica; ArgentinaFil: Spiousas, Ignacio. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Acústica y Percepción Sonora; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Eguia, Manuel Camilo. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Acústica y Percepción Sonora; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Resonance switching in a large sonic crystal cavity
No full textIn this work we present an experimental realization of resonance switching inside a large, relative to the lattice constant, sonic crystal (SC) cavity. The resonances arise from a temporary trapping of the acoustical energy between two sonic crystal slabs when the frequency of the wave falls within a partial band-gap region (thus, the propagation inside the sonic crystal is inhibited for normal incidence and a total reflection occurs). We show that by modifying the geometry of the sonic crystal lattice, from square to centered rectangular, it is possible to switch some resonances on and off, for a certain frequency region corresponding to the second band-gap for normal incidence. We also study the generalization of this phenomenon for the same lattice and band-gap region, as a function of the length of the cavity and the filling fraction the lattice.Fil: Alberti, Alejo. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Acústica y Percepción Sonora; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Spiousas, Ignacio. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Gomez, Pablo Martín. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Electronica; ArgentinaFil: Eguía, Manuel C.. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Acústica y Percepción Sonora; Argentin
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