1,722,229 research outputs found
A new method for measuring the scattering coefficient and the diffusion coefficient of panels
No full textThe sound scattering properties of diffusing panels are actually very difficult to measure and to predict. In this paper the Wave Field Synthesis approach is employed for the experimental measurement of the scattering coefficient. The results are in good agreement with the numerical simulations made possible by some recent improvements to the pyramid Tracing algorithm, which takes into account separately the scattering of sound from the edges of finite-size surfaces, and the surface scattering coefficient
Sviluppo di un Elemento Mixed per lo Studio della Frattura e della Delaminazione nei CompositiNota Scientifica 251 DIASP-Politecnico di Torino
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Acoustics of the former teatro "la fenice" in Venice
Full text linkThe acoustic characteristics of the former "La Fenice" theater have been analyzed. Binaural measurements of the impulse responses were performed at a large number of measuring points within the hall. Following the recent ISO standard 3382 [1], many mono and binaural acoustical parameters were calculated from the impulse responses, such as reverberation time, clarity, center time, strength, initial time delay gap, interaural cross correlation, and others. Finally, Ando's preference maps were developed, taking into account two different kinds of musical signals. The measurements underlined the peculiar acoustical behavior of the theater, characterized by a greater initial decay of the reverberant tail and a subsequent reverberation that allowed a remarkable fusion of the sound and sustain to the musicians
Validation of the pyramid tracing algorithm for sound propagation outdoors: comparison with experimental measurements and with the ISO–DIS 9613 standards
Full text linkThe accuracy of numerical provisions of the sound propagation outdoors made with the newly developed pyramid tracing algorithm, was tested using a directive loudspeaker as the sound source. The pyramid tracing code was compared against experimental measurements and with the ISO-DIS 9613 standards. Both the experimental and numerical data were used to build graphical plots, enabling a direct comparison of the results: they show that the capability of accurately modeling the source directivity produces generally a better estimate using the pyramid tracing algorithm, but the shielding effects and excess attenuation are more accurately modeled by the ISO 9613 code
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