Directional microphone

Details Directional microphone Directional microphone

1996-11-22

1998-12-08

Tran, Sinh

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Housed microphone

381357, 381358, H04R 2500

Patent

active

058481729

ABSTRACT:
A monolithic second order gradient (SOG) microphone structure employs acoustic transmission lines wherein the acoustic phase delay along each of the acoustic transmission lines is in direct proportion to the length of each of the acoustic transmission lines and, where this is effected by the use of an acoustic impedance element placed within each acoustic transmission line that has an acoustic impedance related to the acoustic impedance of the associated acoustic transmission line. In one embodiment, the acoustic impedance element has a specific acoustic impedance substantially matched to the specific acoustic characteristic resistance of the acoustic transmission line. Various embodiments may utilize acoustic or electrical subtraction of the signals in the acoustic transmission lines to realize the desired directional sound pickup.

REFERENCES:
patent: 3715500 (1973-02-01), Sessler et al.
patent: 3944757 (1976-03-01), Tsukamoto
patent: 5226076 (1993-07-01), Baumhauer, Jr. et al.
patent: 5511130 (1996-04-01), Bartlett et al.

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