Earplug for noise protected communication between the user of th

Details Earplug for noise protected communication between the user of th Earplug for noise protected communication between the user of th

1989-05-22

1990-12-04

Ng, Jin F.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Plural or compound reproducers

381 686, 181135, H04R 2502, H04R 110

Patent

active

049759671

ABSTRACT:
The earplug inserted in the auditory canal is so designed that its inside end facing the tympanic membrane makes close contact with the surrounding hard bone structure, and its external end at the aperture of the auditory canal makes close contact with the surrounding tissue. The earplug has a head for connection with a communication system. A central channel conveys sound to the tympanic membrane. The mid-section of the earplug is furnished with a circumferential recess for receiving sound waves from the user's own voice through the surrounding soft tissue: and channels convey these sound waves to a microphone built into the earplug head.

REFERENCES:
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patent: 1355276 (1920-10-01), Schultz
patent: 2246737 (1941-06-01), Knudsen
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patent: 4006796 (1977-02-01), Coehorst
patent: 4150262 (1979-03-01), Ono
patent: 4442917 (1984-04-01), Johnson
patent: 4459247 (1984-07-01), Rothemund
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PCT/AU 83/00039-WIPO 83/03733 of Heyden Spike Co. Pty. Limited for Particle Entrainment Combustion, Oct. 27,1983.

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