| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for measuring accurately the acoustic impedance and the acoustic absorption coefficient of a sample such as a building material in the installed state on a cite. SOLUTION: In this measuring technique of the acoustic impedance and the acoustic absorption coefficient for measuring accurately the acoustic impedance and the acoustic absorption coefficient of the material installed on the cite, the acoustic impedance and the acoustic absorption coefficient of the material are measured by utilizing a usually existing noise without using a sound source speaker. In a room where the usually existing noise level is low and measurement is difficult as it is, a random noise is outputted, and measurement is performed by improving diffusion of the sound in the room.
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