Image-derived second-order directional microphones with finite b

Details Image-derived second-order directional microphones with finite b Image-derived second-order directional microphones with finite b

1995-12-29

1998-04-21

Isen, Forester W.

Electrical audio signal processing systems and devices

Directive circuits for microphones

381 91, 381122, 381160, 381169, H04R 300

Patent

active

057426937

ABSTRACT:
An acoustic transducer including an acoustical reflecting surface of a finite dimension and at least one sensor having an output which produces a first-order differential response pattern. The sensor is located proximate to the reflecting surface, wherein acoustical waves propagating from the reflecting surface, acoustically interact with the sensor to produce a second-order differential response pattern at the output of the sensor at a predetermined frequency. The second-order differential response pattern at the output of the sensor occurs at the predetermined frequency when the finite dimension of the reflecting surface is at least one-half of an acoustic wavelength.

REFERENCES:
patent: 2544536 (1951-03-01), Kettler
patent: 4742548 (1988-05-01), Sessler et al.
patent: 4965775 (1990-10-01), Elko et al.

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