Bayesian decay time estimation in a reverberation chamber for absorption measurements

Jamilla Balint, Florian Muralter, Mélanie Nolan, Cheol Ho Jeong

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This work investigates the use of the initial decay time to obtain the Sabine absorption coefficient from measurements conducted in a reverberation chamber. Due to non-uniform distribution of sound absorption in the test chamber, measured energy decay functions exhibit multiple slopes, which cannot be evaluated unambiguously using linear regression as prescribed in the current standard (ISO 354, International Organization for Standardization, Geneva, Switzerland, 2003). As an alternative, this study proposes a Bayesian framework that allows estimating multiple decay parameters, hence capturing more accurately the energy decay features. Measurements are carried out in a reverberation chamber with and without diffusing elements to investigate the influence of diffusers on the absorption coefficient and on the decay process. Measured absorption coefficients of a porous sample are compared to theoretical values estimated with a transfer matrix model. The results show that the Sabine absorption coefficient calculated using the shortest decay time agrees well with the size-corrected theoretical absorption coefficient.

Original languageEnglish
Pages (from-to)1641-1649
Number of pages9
JournalThe Journal of the Acoustical Society of America
Volume146
Issue number3
DOIs
Publication statusPublished - 1 Sep 2019

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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