APPARATUS FOR MEASURING ACOUSTIC ABSORPTION COEFFICIENT OF SOUND ABSORBING MATERIAL FOR OBTAINING RELIABLE MEASUREMENT RESULT BY ENLARGING FREQUENCY RANGE

摘要

Purpose: a device is provided in a unit by using a central processing unit for measuring an acoustical absorptivity of a sound-absorbing material and easily measures a low frequency and a high frequency. Construction a: device, for measuring an acoustical absorptivity of a sound-absorbing material, component (50), a microphone (70) and a central processing unit (80) are adjusted including a main impedance tube (10), a loudspeaker (30), a sample impedance tube (40), a position. Loudspeaker (30), which is provided to one end part of main impedance tube (40) and provides sound, gives main impedance tube (40). Sample impedance tube (40) couples with the other end part of main impedance tube and has a sound-absorbing material. Position adjusts the position of the sample of component (50) adjustment acoustic absorption material.