Active noise control earpiece being compatible with magnetic cou

Details Active noise control earpiece being compatible with magnetic cou Active noise control earpiece being compatible with magnetic cou

1996-12-19

1998-04-14

Tran, Sinh

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 68, 381 686, 381 685, 381 711, 379 52, 379443, 379444, H04R 2500

Patent

active

057402574

ABSTRACT:
Active noise control for use by individuals using magnetically coupled hearing aids is realized by generating a true representation of the handset input signal, which is employed to drive a separate external field coil. The external field coil is positioned between the handset receiver and the handset acoustic output ports so that it is in close proximity to a user's ear cavity and, hence, to the magnetically coupled hearing aid. Also, in some embodiments of the invention, a magnetic shield is employed between the handset receiver and the external field coil to inhibit the magnetic leakage field from the receiver element from mixing with the magnetic field from the external field coil.

REFERENCES:
patent: 3322897 (1967-05-01), Vozeolas et al.
patent: 3396245 (1968-08-01), Flygstad
patent: 4697283 (1987-09-01), Lafrance et al.
patent: 5010575 (1991-04-01), Marutake et al.
patent: 5086464 (1992-02-01), Groppe
patent: 5134659 (1992-07-01), Moseley
patent: 5557673 (1996-09-01), Ginzburg
"Coupling Hearing Aids To Telephone Sets", Malaga-Torremalinos, ITU Telecommunication Standardization Sector Recommendation p. 37.
Headset with Active Noise-Reduction System for Mobile Applications* by Volker Bartels, Engineer Report--presented at the 90th Convention of the Audio Engineering Society, Paris, France, 1991 Feb. 19-22, pp. 277-281, J. Audio Eng. Soc., vol. 40, No. 4, 1992 Apr.

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