### Abstract

Two ideas to improve the boundary conditions for room acoustic simulations are presented. First, all rooms have finite boundary surfaces, thereby a reflection coefficient for finite surfaces should be

physically more suitable than that for infinitely large surfaces. Second, absorption coefficients measured by the chamber method, so-called the Sabine absorption coefficients, have certain problems to be used in geometrical acoustics simulations; one serious problem is that they often exceed unity for porous absorbers due to the finite sample size and non-uniform intensity in the test reverberation

chamber. Therefore the Sabine absorption coefficients should be converted into the random incidence absorption coefficients, which never exceed unity, thus are more proper for room acoustic simulations.

physically more suitable than that for infinitely large surfaces. Second, absorption coefficients measured by the chamber method, so-called the Sabine absorption coefficients, have certain problems to be used in geometrical acoustics simulations; one serious problem is that they often exceed unity for porous absorbers due to the finite sample size and non-uniform intensity in the test reverberation

chamber. Therefore the Sabine absorption coefficients should be converted into the random incidence absorption coefficients, which never exceed unity, thus are more proper for room acoustic simulations.

Original language | English |
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Title of host publication | Proceedings of Spring Meeting of the Acoustical Society of Korea. |

Publication date | 2013 |

Pages | 104-107 |

Publication status | Published - 2013 |

Event | Spring meeting of the acoustical society of Korea - Incheon, Korea, Republic of Duration: 9 May 2013 → 10 May 2013 |

### Conference

Conference | Spring meeting of the acoustical society of Korea |
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Country | Korea, Republic of |

City | Incheon |

Period | 09/05/2013 → 10/05/2013 |

### Bibliographical note

Spring meeting of the Acoustical Society of Korea## Cite this

Jeong, C-H. (2013). Reflection and absorption coefficients for use in room acoustic simulations. In

*Proceedings of Spring Meeting of the Acoustical Society of Korea.*(pp. 104-107)