Directional microphone assembly

Details Directional microphone assembly Directional microphone assembly

2000-01-07

2000-10-17

Kuntz, Curtis A.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Housed microphone

381381, H04R 2500

Patent

active

06134334&

ABSTRACT:
A microphone capsule for an in-the-ear hearing aid is disclosed. The capsule can include a top plate having first and second spaced openings defining front and rear sound inlets, and a directional microphone cartridge enclosing a diaphragm. The diaphragm is oriented generally perpendicular to the top plate and divides the directional microphone cartridge housing into a front chamber and a rear chamber. A front sound passage communicates between the front sound inlet and the front chamber, and a rear sound passage communicates between the rear sound inlet and the rear chamber. Front and rear acoustic damping resistors are associated with the front and rear sound passages. The acoustic resistor pair provides a selected time delay, such as about 4 microseconds, between the front and rear sound passages. The use of two acoustic resistors instead of one levels the frequency response, compared to the frequency response provided by a rear acoustic damping resistor alone.

REFERENCES:
patent: 5524056 (1996-06-01), Killion et al.
patent: 5613011 (1997-03-01), Chase et al.
patent: 5790679 (1998-08-01), Hawker et al.
patent: 5848172 (1998-12-01), Allen et al.
patent: 5878147 (1999-03-01), Killion et al.

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