Journal
APPLIED ACOUSTICS
Volume 70, Issue 8, Pages 1034-1040Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2009.03.005
Keywords
Noise exposure experiments; Reverberant chamber
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Funding
- Spanish Ministry of Education and Science [TRA2007-68080-C03-02/MODAL]
- Comunidad de Madrid [IV PRICYT IC0530]
- DIGNA Biotech [065510]
- CIBERER [U761]
- MICIN [SAF2008-00470]
- Fundacion Investigacion Medica Mutua Madrileia [20070504]
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Previous work on the acoustic design of small reverberant chambers for studies on laboratory animals has paid, in general, more attention to the frequency response at certain points in their interior. These designs aimed to provide a frequency response as flat as possible at the receivers, thus avoiding unpleasant spectral coloration effects. However, an equally important, and frequently neglected, aspect is to set an acoustic field as spatially uniform as possible inside the zone where the animals are to be placed during the exposure to noise. Here, an optimization procedure is described to calculate the proportions of the chamber dimensions that confers the highest sound level with the minimum mean squared deviation averaged in a given area inside the chamber. In addition, new stimuli have been designed with a high-pass filtering and linear with frequency gain. These stimuli were intended to adapt the characteristics of the exposing noise to the rodent hearing spectrum, displaced toward higher frequencies than the hearing frequency band of humans. (C) 2009 Elsevier Ltd. All rights reserved.
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