Electrical audio signal processing systems and devices – Directive circuits for microphones
Patent
1981-01-21
1983-10-25
Rubinson, G. Z.
Electrical audio signal processing systems and devices
Directive circuits for microphones
179121D, 179179, H01R 110
Patent
active
044120974
ABSTRACT:
A variable directivity microphone device comprises a microphone unit assembly provided and arranged with at least three microphone units, wherein the three microphone units are mutually separated by predetermined distances, and front faces of a first and second microphone units of the three microphone units are provided and arranged facing the front surface of the microphone unit assembly while the front face of a third microphone unit is provided and arranged in a direction opposite to those of the first and second microphone units, a first and second variable resistors respectively having a terminal at one end, an intermediate terminal, and a terminal at the other end, wherein respective sliders are mutually linked or ganged and movable between a first, second, and third positions corresponding to the terminals, where the first variable resistor has the terminals at both ends thereof respectively connected to the output sides of the second and third microphone units and the intermediate terminal thereof connected to ground, an adder for adding and mixing the output of the first microphone unit and a signal obtained from the slider of the first variable resistor, and a frequency characteristic compensating circuit having an operational amplifier, for compensating for the frequency characteristic of the output signal of said adder. The second variable resistor has the terminals at both ends thereof respectively connected between the output side and input side of the operational amplifier, and the slider thereof connected to the output side of the operational amplifier. The frequency characteristic compensating circuit further comprises a frequency characteristic circuit connected in parallel with the second variable resistor, and the microphone device varied of its directivity from non-directivity, to primary unidirectivity, and then to secondary unidirectivity, as the sliders of the first and second variable resistors vary from the above first, to second, and then to third positions.
REFERENCES:
patent: 2496031 (1950-01-01), Anderson et al.
patent: 4308425 (1981-12-01), Momose et al.
Farrar, K., Soundfield Microphone-2 Wireless World, 11/79, pp. 99-103.
Ishigaki Yukinobu
Miyaji Naotaka
Totsuka Kaoru
Yamamoto Makoto
Lev Robert
Rubinson G. Z.
Victor Company of Japan Ltd.
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