Noise-canceling differential microphone assembly

Details Noise-canceling differential microphone assembly Noise-canceling differential microphone assembly

1994-04-21

1995-12-05

Hofsass, Jeffery A.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379389, 379390, 379433, 381 71, 381168, 381189, H04M 100

Patent

active

054736846

ABSTRACT:
Improved microphone performance is achieved by configuring a second-order derivative microphone assembly in such a way that radially divergent near-field input produces a microphone response proportional to a first-order spatial derivative of the acoustic pressure field.

REFERENCES:
patent: 4584702 (1986-04-01), Walker, Jr.
patent: 4773091 (1988-09-01), Busche et al.
patent: 4850016 (1989-07-01), Groves et al.
patent: 5239578 (1993-08-01), Regen et al.
patent: 5260998 (1993-09-01), Takagi
patent: 5341420 (1994-08-01), Hollier et al.
patent: 5381473 (1995-01-01), Andrea et al.
"Second-Order Gradient Noise-Cancelling Microphone," A. J. Brouns, CH1610-5/81/0000-0786 1981 IEEE, pp. 786-789.
"A Second-Order Gradient Noise Canceling Microphone Using a Single Diaphragm," W. A. Beaverson and A. M. Wiggins, Journal of the Acoustical Society of America, 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.

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