Single diaphragm second order differential microphone assembly

Details Single diaphragm second order differential microphone assembly Single diaphragm second order differential microphone assembly

1994-05-04

1996-04-23

Kuntz, Curtis

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Microphone capsule only

381168, 381169, 381154, 381155, H04R 2500

Patent

active

055111300

ABSTRACT:
A second-order differential (SOD) microphone includes a first-order differential (FOD) microphone element installed in a housing. A pair of front sound conduits extend from respective ports to a chamber on the front side of the microphone diaphragm, and a pair of rear sound conduits extend from respective ports to a chamber on the rear side of the microphone diaphragm. The two front ports and the two rear ports are all substantially collinear along a minor axis, with the rear ports intermediate the front ports or the front ports intermediate the rear ports. The respective acoustic transfer functions from each port to the microphone diaphragm are equivalent. The microphone response is approximately proportional to the second spatial derivative, along the minor axis, of a sampled acoustic pressure field.

REFERENCES:
patent: 2640110 (1953-05-01), Olson et al.
patent: 4584702 (1986-04-01), Walker, Jr.
patent: 4773091 (1988-09-01), Busche et al.
patent: 4850016 (1989-07-01), Groves et al.
patent: 5268965 (1993-12-01), Badia et al.
"Second-Order Gradient Noise Canceling Microphone," A. J. Brouns, IEEE International Conference on Acoustics, Speech, and Signal Processing, CH1610-5/81 (May 1981), pp. 786-789.
"A Second-Order Gradient Noise Canceling Microphone Using a Single Diaphragm," W. A. Beaverson and A. M. Wiggins, J. Acoust. Soc. Am., vol. 22, No. 5, Sep. 1950, pp. 592-601.
"Adaptive Noise Cancelling: Principles and Applications," B. Widrow et al., Proc. IEEE 63, Dec. 1975, pp. 1692-1716.
"Second Order Gradient Uni-Directional Microphones Utilizing an Electret Transducer," G. M. Sessler and J. E. West, J. Acoust. Soc. Amer., vol. 58, 1975, pp. 273-278.
"Autodirective Microphone System," J. L. Flanagan et al., ACUSTICA, vol. 73, 1991, pp. 58-71.

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