残響室法吸音率における拡散方策と測定試料面積の効果

概要

論文の詳細を見る
The goal of this study is to develop a technique for measuring the absorption coefficient using a specimen that has an area smaller than that of the test specimen defined in “Measurement of Sound Absorption Coefficients in a Reverberation Room"(JIS A 1409)but that achieves equivalent results. The absorption coefficient of each test specimen is affected by so-called“Edge-effect"so that they are dependent on the specimen size. Moreover, since the area of a test specimen affects the diffusivity in a room, it is important to ensure appropriate acoustic energy diffusion in a particular room. In this experiment, the measurement results of the absorption coefficient of a stationary diffuser suspended in a reverberation room were compared with those obtained using the deep-well method. The experiment demonstrated that Edge-effect can be reduced by employing appropriate diffusion conditions in the test room.