Sharp Directivity Function Based on Fourier Series Expansion and Its Directional System Realization With Small Number of Microphones

摘要

In order that speech recognition system may have a highrecognition rate in a noisy environment, a wide-band sharpdirectional microphone system is required at the input for securing ahigh S/N ratio. The authors have already reported the realization ofa wide-band uni-directional microphone system by three-microphoneintegration method.