Sound field reconstruction method of spatial point sound source to accurately calibrate microphone arrays

Abstract

The common methods to calibrate microphone array are those that calibrate each microphone. Different from these methods, this article proposes a simulated point sound source calibration method without calibrating each microphone. Suppose there is a microphone array in the sound field of the point source, according to the positional relationship between the array and the source, the dynamic sound signal of every microphone can be calculated. A microphone array calibration device (MACD) is designed to input the dynamic signals calculated into the actual microphone array by the coupling cavity standard sound sources. By comparing the position of the simulated point source with that located by array, position error correction curves are fitted to calibrate the positioning accuracy of microphone array. The experimental results reveal validity of the proposed method.