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Improving the performance of a small microphone array at low frequencies using critical band and LPC codebooks

This paper presents a novel method for improving the low frequency performance of a microphone array by use of a twin codebook consisting of critical band energy and LPC distribution of speech. A modified Wiener filter created using these codebooks eliminates residual noise at low frequencies, which may result from the limitation of the array size or the beamforming algorithm. The preliminary simulation tests have shown that the proposed system is effective, and may provide good performance for those microphone array systems which are installed on a computer in an office, or in a moving vehicle.