Design of a MEMS Microphone Array Data Acquisition System
Lytis Alexandros
Abstract
The present thesis deals with the design and implementation of a microphone array system for use as laboratory equipment for recording audio and speech for signal processing applications. The array is specified to support audio recording simultaneously from up to 32 channels organized at four branches of eight microphones each capable of operating at long distances. The acoustic sensors used in the system are digital MEMS microphones. The system was built in the form of a star and with the ability to adjust the number of connected microphones easily just by plugging or unplugging nodes. The data is collected from the central node of the star and stored without any compression on a memory card while one of the channels is fed in real time to a computer via USB. The industry standard RS-485 was used to transfer the data to the central hub.