Microphone array diffracting structure

Details Microphone array diffracting structure Microphone array diffracting structure

2006-06-27

2006-06-27

Pendleton, Brian T. (Department: 2644)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having acoustic wave modifying structure

C381S356000, C381S092000

Reexamination Certificate

active

07068801

ABSTRACT:
The present invention increases the aperture size of a microphone array by introducing a diffracting structure into the interior of a microphone array. The diffracting structure within the array modifies both the amplitude and phase of the acoustic signal reaching the microphones. The diffracting structure increases acoustic shadowing along with the signal's travel time around the structure. The diffracting structure in the array effectively increases the aperture size of the array and thereby increases the directivity of the array. Constructing the surface of the diffracting structure such that surface waves can form over the surface further increases the travel time and modifies the amplitude of the acoustical signal thereby allowing a larger effective aperture for the array.

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“Super directivity design for a sphere-buffed microphone array” J. Acoust. Soc. Am., vol. 103, No. 5, May 1998, Kawahara and Fukudome.
“A steerable and variable first-oder differential microphone array”, Intl. Conf. On accoustics, Speech and Signal,Processing, 1997, Elko and Pong.
“A Method of Interpolating the Diffractive Information of the Spere-Baffled Microphone in the Sound Field of Sperical Wave” Dept. Of Acoustic Design, Japan, Fukudome.

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