Noise canceling gradient microphone assembly

Details Noise canceling gradient microphone assembly Noise canceling gradient microphone assembly

1995-05-11

1997-07-22

Tran, Sinh

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Microphone capsule only

381155, 381168, 381169, H04C 2500

Patent

active

056510748

ABSTRACT:
An improved Broadside SOG microphone assembly is realized by employing a microphone assembly having at least three ports arranged in a non-colinear fashion with the at least three ports defining and being in a "gradient" plane and with both outer adjacent differential pair of ports aligned in a direction substantially toward a prospective talker's lips. Thus, the inner port(s) is always closer to the prospective talker's lips. Each outer differential pair of ports forms a dipole which yields a high spatial gradient and, hence, higher speech sensitivity since they are pointed substantially toward the prospective talker's lips. Just as important, as the prospective talker's lip position relative to the microphone varies, this alignment of each outer differential pair of ports will result in the least change in the dipole sensitivity and, therefore, the lowest Broadside SOG microphone position sensitivity. Another advantage of this arrangement is that it similarly has significantly reduced position sensitivity with angular departure from the nominal Broadside prospective talker's lip position, owing again to the orientation of the prospective talker's lips. In a preferred embodiment, a single FOG microphone element is employed which accepts four distinct acoustic signals from acoustic transmission lines from four distinct ports arranged in a non-colinear fashion. The four ports define and are in a "gradient" plane with both outer adjacent differential pair of ports aligned in a direction substantially toward the prospective talker's lips. Thus, the inner ports are always closer to the prospective talker's lips. Each outer differential pair of ports forms a dipole which yields a high spatial gradient and, hence, higher speech sensitivity since they are pointed in a direction substantially toward the prospective talker's lips. To this end, the outer ports are plus (+) ports and the inner ports are minus (-) ports, or vice versa, referring to each side of the FOG element's diaphragm.

REFERENCES:
patent: 5303307 (1994-04-01), Elko et al.
patent: 5511130 (1996-04-01), Bartlett et al.
U.S. patent application by Charles Spurgeon Bartlett and Michael Anthony Zuniga, entitled "Single Diaphragm Second Order Differential Microphone Assembly", Ser. No. 08/237,798 filed on May 4, 1994.
U.S. patent application by Charles Spurgeon Bartlett and Michael Anthony Zuniga, entitled "Noise-Canceling Differential Microphone Assembly", Ser. No. 08;230,955 filed Apr. 21, 1994.
U.S. patent application by Charles Spurgeon Bartlett and Michael Anthony Zuniga entitled "Baffled Microphone Assembly", Ser. No. 08/333,671 filed Nov. 3, 1994.
JASA, vol. 58, No. , Jul. 1975, entitled "Second-Order Gradient Unidirectional Microphones Utilizing An Electret Transducer", authorized by G. M. Sessler and J. E. West.
JASA, vol. 22, No. 5, Sep. 1950, entitled "A Second-Order Gradient Noise Canceling Microphone Using A Single Diaphragm", authored by W. A. Beaverson and A. M. Wiggins.

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