Electrical audio signal processing systems and devices – Directive circuits for microphones
Patent
1985-08-16
1987-09-22
Rubinson, Gene Z.
Electrical audio signal processing systems and devices
Directive circuits for microphones
381122, 381155, 381168, H04R 140
Patent
active
046960430
ABSTRACT:
A microphone apparatus includes an array of equally spaced microphones divided into a center subarray and a pair of side subarrays located one on each side of the center subarray. A first weighting network having a plurality of weighting factors impresses a first weighting function on signals from the center subarray. Second and third weighting networks each having a plurality of weighting factors impress second and third weighting functions respectively on signals from the side subarrays. The first, second and third weighting functions correspond respectively to center and side portions of a total function. Signals from the first weighting network are summed in a first adder, signals from the second and third weighting networks being summed in a second adder and cmbined with the output of the first adder in a third adder to produce an output signal. A variable directivity pattern is obtained by a level setting means which allows adjustment of the level of the output signal from the second adder in a predetermined relationship with the level of the output signal from the first adder.
REFERENCES:
patent: 4130726 (1978-12-01), Kates et al.
patent: 4521908 (1985-06-01), Miyaji et al.
patent: 4536887 (1985-08-01), Kaneda et al.
Iwahara Makoto
Miyaji Naotaka
Sakamoto Atsushi
Byrd Danita R.
Rubinson Gene Z.
Victor Company of Japan Ltd.
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