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A multi-DSP implementation of a broad-band adaptive beamformer for use in a hands-free mobile radio telephone

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4 Author(s)
I. Claesson ; Dept. of Telecommun. Theory, Lund Univ., Sweden ; S. E. Nordholm ; B. A. Bengtsson ; P. Eriksson

An implementation of a broadband adaptive array on a multiprocessor digital signal processing system for use in a hands free mobile radio telephone is described. This implementation of a five-microphone adaptive Griffiths-Jim array can handle FIR filters with up to 128 taps behind each microphone at a sampling rate of 8 kHz. The filter structure makes it possible to combine an adaptive array with a noise canceler. The near-field problem has been solved by using focusing, a speech-controlled adaptive algorithm, and a short hourglass. Preliminary measurements indicate a considerable potential for this technique in hands-free mobile telephony. The array gives a 20-30 dB suppression of a broadband jammer covering 300-1100 Hz, even with three reflecting walls surrounding the microphone.<>

Published in:

IEEE Transactions on Vehicular Technology  (Volume:40 ,  Issue: 1 )