Development of measuring device of acoustic characteristic for sound absorber and sound barrier

摘要

To measure the characteristic of acoustic material such as sound absorber and sound barrier, a simple device has been developed instead of using reverberant rooms and a big size of specimen. The two-microphone random-excitation technique has been adopted to separate the incident wave and reflected wave spectra in a duct. The test result using the device has been compared with the experimental data of the reverberant room method showing its efficiency.