Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22702
Title: Early energy decays in two churches in Hong Kong
Authors: Chu, Y
Mak, CM 
Keywords: Coupled-room
Early energy decay
Issue Date: 2009
Publisher: Pergamon Press
Source: Applied acoustics, 2009, v. 70, no. 4, p. 579-587 How to cite?
Journal: Applied acoustics 
Abstract: Acoustical measurements based on impulse responses have been made in a Protestant and a Catholic church in Hong Kong. Analysis has concentrated on reverberation time, early decay time and C80, the early-to-late ratio, as well as integrated decays. The measured results have been compared with predictions according to two different theoretical room acoustic models: a model for a single diffuse space and one for a set of coupled-rooms. The comparison has shown that treating the churches as a series of coupled spaces is more valid. However the clarity, C80, at different receiver positions was found to be either under- or over-estimated by the classical coupled-room model. Following this observation, a delayed coupled-room model was developed in the hope of achieving more accurate predictions. In this model, the initial condition under the impulse excitation was modified by introducing a time delay for sound propagated from the source to achieve diffuse sound fields in each subspace. The predicted results of the coupled-room model agree well with the measured results.
URI: http://hdl.handle.net/10397/22702
ISSN: 0003-682X
EISSN: 1872-910X
DOI: 10.1016/j.apacoust.2008.07.004
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