Auditory assistance apparatus and method

Details Auditory assistance apparatus and method Auditory assistance apparatus and method

1994-10-25

1996-09-17

Hofsass, Jeffery

Telephonic communications

Terminal accessory or auxiliary equipment

Including coupler

379 52, 381 68, H04M 100, H04R 2500

Patent

active

055576737

ABSTRACT:
An auditory assistance apparatus and method for use with a sound signal source which also produces a magnetic field propagated along a magnetic field axis to increase the signal-to-noise ratio with respect to ambient noise. A pair of magnetic pickup coils of substantially the same electrical and magnetic parameters, but of opposite polarity, are located close to the sound signal source and oriented symmetrically with respect to the geometrical axis of the auditory assistance apparatus with the magnetic axes of the pickup coils substantially parallel to each other and substantially perpendicular to the magnetic field axis of the sound signal source and the geometrical axis of the auditory assistance apparatus; and an amplifier which adds and amplifies the outputs of the serially-connected pickup coils and feeds same to an audio transducer for conversion to sound.

REFERENCES:
patent: 3396245 (1968-08-01), Flygstad
patent: 4777474 (1988-10-01), Clayton
patent: 5010575 (1991-04-01), Marutake et al.
Compton, C. L., "Providing Effective Telecoil Performance With In-The -Ear Hearing Instruments," The Hearing Journal, vol. 47, No. 4 (Apr. 1994), pp. 23-26, 28, 29, 32, 33.
Preves, D. A., "A Look at the Telecoil--Its Development and Potential." SHHH Journal, Sep./Oct. 1994, pp. 7-10.

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