Hearing aid with a magnetic field-controlled switch, and...

Details Hearing aid with a magnetic field-controlled switch, and... Hearing aid with a magnetic field-controlled switch, and...

2004-09-24

2009-02-24

Young, Wayne (Department: 2627)

Electrical audio signal processing systems and devices

Hearing aids, electrical

C381S326000, C381S329000, C381S331000

Reexamination Certificate

active

07496206

ABSTRACT:
In a hearing aid with a magnetic field-controlled switch and a method for operating such a hearing aid, the magnetic field sensor for automatically switching the hearing aid is miniaturized and made more cost-effective by the use of a ferrite component as the magnetic field sensor. This component can be evaluated by a Wheatstone bridge circuit which is fed by an oscillator. In this context, a measuring amplifier with a threshold value detector supplies a corresponding switching signal for the hearing aid.

REFERENCES:
patent: 4467145 (1984-08-01), Borstel
patent: 4995085 (1991-02-01), Kern et al.
patent: 2004/0052392 (2004-03-01), Sacha et al.
patent: 196 33 321 (1997-11-01), None
patent: 299 23 019 (2000-05-01), None
patent: 1 398 995 (2003-09-01), None
patent: 07043442 (1995-02-01), None

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