Microphone array diffracting structure

Details Microphone array diffracting structure Microphone array diffracting structure

2008-04-29

2008-04-29

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Directive circuits for microphones

C381S091000, C381S122000, C381S160000, C381S356000

Reexamination Certificate

active

07366310

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.

REFERENCES:
patent: 4802227 (1989-01-01), Elko et al.
patent: 4904078 (1990-02-01), Gorike
patent: 5539834 (1996-07-01), Bartlett et al.
patent: 5592441 (1997-01-01), Kuhn
patent: 5742693 (1998-04-01), Elko
patent: 5778083 (1998-07-01), Godfrey
patent: 6041127 (2000-03-01), Elko
patent: 0 869 697 (1998-10-01), None
Robust Adaptive Beamforming—Henry Cox, Fellow, IEEE, Robert M. Zeskind Senior Member ; Mark M. Owen, Member, IEEE Transactions on Acoustics, Speech and Signal Processing, vol. Assp-35, No. 10, Oct. 1987.
M.A. Hand: “Methodes de Discretisation part Elements Finis et Elements Finis de Frontiere,” pp. 355-357, (Chapter 9) of “Rayonnement Acoustique de Structures”, edited by Claude Leseur, Published Mar. 1, 1988.
J.J. Bowman, T.B.A. Senior, P.E. Uslenghi “Electromagnetic and Acoustic Scattering by Simple Shapes”, published by Hemisphere, New York, 1987, ISBN 0891168850.

Affiliated with

Also associated with

Rating

Microphone array diffracting structure does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Microphone array diffracting structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microphone array diffracting structure will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2748620