Equivalent sound absorption area in a rectangular reverberant room (Sabine's sound absorption factor)

✍ Scribed by M. Tohyama

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 231 KB
• Volume: 108
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1016/s0022-460x(86)80060-8

✦ Synopsis

The equivalent sound absorption area in a rectangular reverberant room can be derived from the initial first and second derivatives (initial decay rate of the time derivative) of the ensemble and space-averaged sound energy decay curve. At low frequency bands, how to estimate the equivalent sound absorption area from the reverberation time has not been theoretically interpreted. This is becahse the decay curve is not linear in logarithmic scales. The formula for the absorption area derived here, however, does not contain the reverberation time. It shows the theoretical relation between the absorption area and the initial slopes of the decay curve. The equivalent absorption area and averaged damping constants can be estimated theoretically according to the relation derived here for low frequency bands.