Acoustic tube and directional microphone

Details Acoustic tube and directional microphone Acoustic tube and directional microphone

2006-03-22

2010-06-29

Ensey, Brian (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Housed microphone

C029S594000, C381S358000

Reexamination Certificate

active

07747033

ABSTRACT:
An acoustic tube that can be manufactured simply and can also be reduced in size easily is obtained. By using the acoustic tube, a directional microphone which has a simple structure and can be reduced in size easily is obtained. In an integrally molded acoustic tube, an acoustic resistance material arranged on the inner circumferential surface of the acoustic tube is integrated to the acoustic tube by molding of the acoustic tube. It is preferable to select resin as the material of the acoustic tube and resin mesh as that of the acoustic resistance material. It is preferable that the acoustic tube have a slit-like acoustic resistance part and the acoustic resistance material be present in the acoustic resistance part. It is preferable to configure a directional microphone by using the acoustic tube.

REFERENCES:
patent: 3993161 (1976-11-01), Shore
patent: 4862507 (1989-08-01), Woodard
patent: 57-181176 (1982-11-01), None
patent: 6-48294 (1994-06-01), None
patent: 8-317487 (1996-11-01), None
patent: 11-168783 (1999-06-01), None
patent: 2000-50385 (2000-02-01), None
patent: 2000-83292 (2000-03-01), None
patent: 2000-333283 (2000-11-01), None

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