On making quality recordings of distant speech by using a 2D microphone array

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In this research, we obtained the following major achievements through a study about distant speech recording. (1) 2 dimensional microphone array producing an easily steerable spotlight-shaped directional beam. (2) Enhancement of the intelligibility of captured speech by controlling 3 acoustic features such as mean pitch frequency, pitch frequency range and spectral intensity around 3 kHz. (3) Bass augmentation of speech captured through a portable microphone-array of an insufficient aperture length by using psychoacoustic phenomenon MISSING FUNDAMENTAL. These achievements are expected to be useful for making quality recordings of lecture speech.