A fundamental investigation of the small microphone array system and its applications

Abstract

A purpose of this research is to construct a 3‐D sound recording and reproduction system that has a high presence by performing a spatially controlled sound field synthesis technique. For this purpose, it will be required to examine and choose the most suitable sound recording system, since a conventional sound recording system samples only original signal itself, and does not include enough spatial information. In other words, it will be required to examine the system to record the information of the three‐dimensional spaces, such as the direction and the distance, and to transform the configuration to become effective to the reproduction system. This paper will deal with a basic examination to construct the microphone array placed in proximity and the recording system, which is able to control the directivities in the three‐dimensional spaces, using algorithm based on LMS by FIR filter networks from signals to each microphone.