Microphone system

Details Microphone system Microphone system

1997-11-06

2000-05-30

Chang, Vivian

Electrical audio signal processing systems and devices

Directive circuits for microphones

381122, H04R 300

Patent

active

060699612

ABSTRACT:
Provided is a microphone system capable of detecting a direction of a sound source and extracting an object sound with a high S/N ratio. A microphone system comprises a plurality of microphone pairs 1 to 7, each pair having two microphones arranged apart from each other at a predetermined space at a crossing angle of 60 degrees or less, a plurality of subtraction circuits 11a for calculating a difference signal of outputs of each microphone pair, a plurality of addition circuits 11e for calculating a sum signal of outputs of each microphone pair, circuit sections 11c, 11d and 20 for detecting, as sound source direction information, a minimum value output from each output of the subtraction circuits 11a, and a switch 11f for selecting a sum signal of the microphone pairs 1 to 7 corresponding to the minimum value output and for outputting the selected sum signal as sound information.

REFERENCES:
patent: 5058170 (1991-10-01), Kanamori et al.
patent: 5193117 (1993-03-01), Ono et al.
patent: 5226087 (1993-07-01), Ono et al.
patent: 5524059 (1996-06-01), Zurcher
patent: 5729507 (1998-03-01), Massa

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