@article {Torres-Guijarro:2012:1610-1928:411,
title = "A Study of Wideband Absorbers in a Non-Environment Control Room: Normal Absorption Coefficient Measurement and Analysis",
journal = "Acta Acustica united with Acustica",
parent_itemid = "infobike://dav/aaua",
publishercode ="dav",
year = "2012",
volume = "98",
number = "3",
publication date ="2012-05-01T00:00:00",
pages = "411-417",
itemtype = "ARTICLE",
issn = "1610-1928",
url = "https://www.ingentaconnect.com/content/dav/aaua/2012/00000098/00000003/art00007",
doi = "doi:10.3813/AAA.918526",
author = "Torres-Guijarro, Soledad and Pena, Antonio and P{\’e}rez-Cabo, David and Degara-Quintela, Norberto",
abstract = "This contribution concludes the study initiated in [1] about the wideband absorbers of the rear wall in a nonenvironment control room at the Universidade de Vigo. The specific acoustic impedance will be calculated from microphone signals of a p-p intensity probe, and the
H
2 estimator will demonstrate that it provides the best estimate both at fixed measuring points and in scanning. The absorption coefficient calculated from the specific acoustic impedance is related to the sound field characterisation in the vicinity of the panels: in the
very low frequency region it presents maxima and minima attributable to the behaviour of the channels between panels as open-closed tubes, and also shows the effect of the first transverse standing wave in fixed point measurements performed in the centre of the channel opening. This effect
disappears in the scanning measurement providing an average absorption curve in a wide area in front of the absorbers. A simple model can be made from the results for the absorption of the wideband absorbers of the rear wall of the room.",
}