Device for transmission of sound with selective filtering for in

Details Device for transmission of sound with selective filtering for in Device for transmission of sound with selective filtering for in

1994-04-01

1998-11-03

Le, Huyen D.

Electrical audio signal processing systems and devices

Sound effects

Reverberators

381 69, 181130, H04R 2500

Patent

active

058320946

ABSTRACT:
An earplug for selective filtering of sound transmission into the external auditory canal. A tube extends through the plug and opens into a space defined by the end piece and the eardrum of a user. The opposite end of the tube is connected to an acoustic valve which is partially or wholly inserted in the plug and contains one or more resonance cavities.

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patent: 4811402 (1989-03-01), Ward
patent: 4974606 (1990-12-01), Van Mierlo
patent: 4975967 (1990-12-01), Rasmussen

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