Active noise suppression for a hearing aid device which can...

Details Active noise suppression for a hearing aid device which can... Active noise suppression for a hearing aid device which can...

2005-07-19

2005-07-19

Le, Huyen D. (Department: 2643)

Electrical audio signal processing systems and devices

Hearing aids, electrical

C381S318000, C381S328000, C381S071600, C381S094100

Reexamination Certificate

active

06920227

ABSTRACT:
In the case of a hearing aid device which can be worn in the ear or a hearing aid device with a otoplastic which can be worn in the ear, the penetration of direct sound through a ventilation channel of the hearing aid device or of the otoplastic is prevented. An acoustic signal is picked up from the ventilation channel via a second microphone in a first region of the ventilation channel and phase-shifting it in a filter device in such a way that the direct sound is at least largely eliminated after the phase-shifted signal is emitted into the ventilation channel via a second earphone. The invention offers the advantage that an enlargement of the cross section of the ventilation channel is made possible as a result, even to provide an open supply, without disturbing direct sound getting into the auditory canal of the person wearing the hearing device.

REFERENCES:
patent: 5033090 (1991-07-01), Weinrich
patent: 40 10 372 (1991-10-01), None

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