Abstract

This paper describes two circular microphone arrays and square microphone array which may be used for sound localization and sound capture. Sound capture by microphone array is achieved by Sum and Delay Beam Former (SDBF). A dedicated PCI 128-channel simultaneous input analog-to-digital (AD) board is developed for 128-channel microphone array with maximum sampling rate of 22.7 /spl mu/s/sample. Our 128-channel circular microphone array is under construction, but 24 channel circular microphone array and 128 channel square microphone array have been completed. The 24 channel circular microphone array can capture sound from an arbitrary direction. The 128-channel square microphone array can capture sound from specific point. The 24-channel circular microphone array and the 128-channel square microphone array are evaluated by using frequency components of the sound. The 128-channel circular microphone array is evaluated by simulations of the sound pressure distribution. These microphone arrays will be used as the capture method of a meeting system which automatically takes minutes of conference.

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