Early energy decays in two churches in Hong Kong

Yijing Chu, Cheuk Ming Mak

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)579-587
Number of pages9
JournalApplied Acoustics
Issue number4
Publication statusPublished - 1 Apr 2009


  • Coupled-room
  • Early energy decay

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


Dive into the research topics of 'Early energy decays in two churches in Hong Kong'. Together they form a unique fingerprint.

Cite this