Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : July 18, 2024
As potential calibration methods for the low-cost microphone such as MEMS type, two alternative methods, the pressure calibration method by a modified active coupler and the bulk calibration method using a reverberation chamber are proposed and the feasibility is investigated. The modified active coupler is designed to make that the comparison calibration with the reference microphone is possible for the surface mounted configuration. For the bulk calibration method, the procedure of sound power measurement with the calibrated reference sound source is applied. The proposed methods have relatively higher uncertainty compared to the standard microphone calibration method standardized in IEC, however it still maintained within the acceptable level regarding the practical application of MEMS microphones.
