Abstract. Specialist bibliographies reveal that there are many parameters for fully describing the acoustics of a hall. Are all of these parameters absolutely necessary? Although hall acoustics is a complex discipline, we can nevertheless see that many parameters measure aspects that are very similar to musical perception. Our aim in this paper is to use factor analysis to find a small number of statistically independent parameters that will enable musical performance halls to be characterised using just a few parameters. At the same time, we aim to identify other parameters that will be useful to researchers as part of a lineal combination. To achieve this, we have measured impulse responses in 17 halls and determined the most common 18 parameters. By using factor analysis, we have identified the three key factors that satisfy the required characteristics. This result confirms those obtained in an earlier study [1] of nine halls. The factors obtained strongly correlate with other classic parameters. Factor 1 correlates with reverberation time; Factor 2 correlates with the objective parameters for the impression of space; and Factor 3 correlates with parameters of strength. This last factor also correlates strongly with objective parameters for listener envelopment (LEV) [2].
SummaryThe study of rooms devoted to sound transmission has become adiscipline in which all the fundamentals areas of current scientificr esearch in acoustics converge. To demonstrate howt his convergence arises in this work, we present acomplete and detailed acoustics study of the Sant Jaume Basilica in Algemesí (Valencia, Spain), a building which has been declared as ite of cultural interest. Starting from this overall perspective,t he first part of this paper describes the features of the room studied (chosen for its complexity), the usual parameters for the analysis of room acoustics, and twomeasurement methodologies and twosimulating methods widely used by the scientificc ommunity.B ased on the theoretical results (obtained from modelling)a nd measurements following the recommendations of ISO 3382 Standard [1], we study the errors in 'just noticeable differences' in acoustic parameters that al istener may perceive.T he aim of the study is to highlight the drawbacks and successes of the procedures used. From the perspective of comparing the results, the purpose of this study is not to assess the experimental procedures themselves or the modelling systems, butr ather to demonstrate, using the four possible measurement-calculation combinations, whether the differences obtained between the theoretical values and experimental values are within areasonable range of acceptability.
La Catedral de Valencia (España) es el resultado de múltiples intervenciones y ampliaciones realizadas a lo largo de su historia. La repristinación parcial del templo en las últimas décadas ha generado una nueva configuración espacial y una variación en los revestimientos, influyendo en la acústica del recinto. Los edificios de culto presentan una sonoridad característica que debe ser objeto de especial protección, por lo que resulta importante determinar las variaciones que, en cuanto a calidad acústica, hayan podido producirse. Para ello, a través de simulaciones acústicas, se ha realizado un estudio comparativo del comportamiento acústico antes y después de la repristinación realizada. Esta metodología permite predecir el resultado acústico de cualquier intervención antes de su ejecución práctica. Con ello, se presenta una nueva variable a la hora de afrontar la restauración del patrimonio: la acústica arquitectónica.
Los recintos de culto son construcciones patrimoniales de un gran valor histórico, artístico y arquitectónico. Además, presentan una sonoridad característica que debe ser objeto de especial protección. En este sentido, la simulación acústica y visual se presenta como una herramienta muy eficaz para la preservación y difusión de los valores patrimoniales, materiales e inmateriales, de los recintos de culto, ofreciendo la posibilidad de realizar turismo virtual en los entornos simulados. Además, se garantiza la preservación de los actuales valores patrimoniales de los templos, permitiendo su disfrute y estudio por parte de futuras generaciones. Con todo ello, en este estudio se ha realizado la simulación acústica y visual del interior de la Catedral de Valencia.
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