Application of wave field synthesis to active control of highly non-stationary noise

Alejandro Magno, el “nuevo” Posidipo y los prodigios. A propósito de los epigramas 31 y 35 A.-B.

“…La primera lectura de , οἷον: "un prodigio tal…", puede ser sustituida por la de Lapini 46 , οἶον adverbial, es decir, no se trata de una oposición entre otros reyes y los Argéadas, sino entre los Argéadas en general y uno de ellos en particular: Alejandro 47 . Esto supone quitar la puntuación al final del v. 4 y entender δέ como adversativa que contrapone los οἰωνοί del águila y del relámpago, comunes a otros reyes Argéadas, al τέρας que acontece a uno de ellos en particular: Alejandro.…”

Large-scale outdoor sound field control

“…Betlehem et al (2018) show that indoors, the late part of control filters is especially sensitive to temperature changes. Active control of sound outdoors has mainly been studied numerically (Berkhoff, 2005;Nakashima and Hodgson, 2005;Stein et al, 2019;Wright and Atmoko, 2001) or at single points only (Lapini et al, 2018).…”

“…Instead, a sound propagation model can be used to estimate the transfer functions. Previous studies have mainly used simple point source models with the multi-point approach (Choi and Kim, 2002;Zhu et al, 2017) or with wave-field synthesis (Kuntz and Rabenstein, 2004;Lapini et al, 2018). Yet, it has been recently shown (Caviedes-Nozal et al, 2019b) that modeling the sound sources with higher-order spherical harmonics and estimating the corresponding mode coefficients from few in situ measurements leads to significantly better results.…”