Directional microphone apparatus

Details Directional microphone apparatus Directional microphone apparatus

1986-07-22

1987-10-27

Isen, Forester W.

Electrical audio signal processing systems and devices

Directive circuits for microphones

367125, 367126, H04R 300

Patent

active

047035064

ABSTRACT:
A directional microphone apparatus includes an array of at least three sets of microphone units, circuits for processing the output signals from the microphone units to produce a first signal which varies in accordance with the second order bidirectional sound pressure gradient characteristic of the array, weighting circuits for applying respective weighting coefficients to the output signals from the microphone units in accordance with a desired shape of directivity response characteristic, to produce corresponding weighted signals which are combined to form a second signal. The first and second signals are combined to produce an output signal which exhibits sharp directivity even at relatively low frequencies in the audio range.

REFERENCES:
patent: 4025894 (1977-05-01), Ziese
patent: 4485484 (1984-11-01), Flanagan
patent: 4536887 (1986-08-01), Kaneda et al.
S. Ibaraki et al: "2nd-Order Gradient Microphone Alley" Acoustic Research Lab. Matsushita Elec. Ind. Co., Ltd.; Mar. 1984.
Yoshihiko, ABE et al: "Practical Application and Digital Control of the Microphone Array"; AES, Presented at the 76th Convention 1984 Oct. 8-11, New York.

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