Noise reduction processing arrangement for microphone arrays

Details Noise reduction processing arrangement for microphone arrays Noise reduction processing arrangement for microphone arrays

1987-04-03

1989-01-31

Isen, Forester W.

Electrical audio signal processing systems and devices

Directive circuits for microphones

381 94, 367123, H04R 300

Patent

active

048022276

ABSTRACT:
A sound processing arrangement couples sound from a prescribed environment through a fixed microphone array to a signal processing arrangement having a specifiable preferred sound source location. The microphone pickup signals are combined with a set of weighting signals to adjust the directional response pattern in successive analysis time intervals. The weighting signals are modified in each analysis time interval so that the total acoustic signal power of the signal processing arrangement output signal is decreased toward a minimum while substantially unity power transfer of sound signals from said preferred location is maintained at all frequencies over a prescribed frequency range. In this way, the preferred source location is in the main beam while unwanted sound source locations are at the null points of the adjusted directional response pattern.

REFERENCES:
patent: 4228531 (1980-10-01), Bogert et al.
patent: 4485484 (1984-11-01), Flanagan
patent: 4536887 (1985-08-01), Kaneda et al.
patent: 4559642 (1985-12-01), Naotaka et al.
patent: 4581758 (1986-04-01), Coker et al.
Proceedings of the IEEE, vol. 60, No. 8, 8/72, "An Algorithm for Linearly Constrained Adaptive Array Processing", by O. L. Frost, III, pp. 926-935.

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