Microphone array having a second order directional pattern

Details Microphone array having a second order directional pattern Microphone array having a second order directional pattern

2006-06-20

2006-06-20

Pendleton, Brian T. (Department: 2644)

Electrical audio signal processing systems and devices

Directive circuits for microphones

Reexamination Certificate

active

07065220

ABSTRACT:
A directional microphone system is disclosed, which comprises circuitry for low pass filtering a first order signal, and circuitry for high pass filtering a second order signal. The system further comprises circuitry for summing the low pass filtered first order signal and the high pass filtered second order signal. A method of determining whether a plurality of microphones have sufficiently matched frequency response characteristics to be used in a multi-order directional microphone array is also disclosed. For a microphone array having at least three microphones, wherein one of the microphones is disposed between the other of the microphones, a method of determining the arrangement of the microphones in the array is also disclosed.

REFERENCES:
patent: 3860928 (1975-01-01), Ehrlich
patent: 5463694 (1995-10-01), Bradley et al.
patent: 6385323 (2002-05-01), Zoels
patent: 6741713 (2004-05-01), Boone et al.
patent: 0 381 498 (1990-02-01), None
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patent: 0 982 971 (2000-03-01), None
patent: WO 00/30402 (2000-05-01), None

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