Hearing aid circuit having an output stage with a limiting means

Details Hearing aid circuit having an output stage with a limiting means Hearing aid circuit having an output stage with a limiting means

1991-07-15

1993-02-23

Ng, Jin F.

Electrical audio signal processing systems and devices

Sound effects

Reverberators

381 682, 381104, 381109, H04R 2500

Patent

active

051897040

ABSTRACT:
A hearing aid circuit has an output stage which is connectable via an earphone and a battery to a circuit that has an adjustable limiting means for electrically limiting the maximum acoustic output level of the hearing aid. The limiting means is electronically designed such that a reduction in the maximally obtainable acoustic output level of the earphone in the zero position of the limitation is avoided. At least one first controllable semiconductor is operated with an adjustable component part as a current-traversed switch given a deactivated electronic limiting, and which can be operated as a current-traversed, variable resistor in the circuit given activated electronic limiting.

REFERENCES:
patent: 3867576 (1975-02-01), Simonsen
patent: 4119814 (1978-10-01), Harless
patent: 4517415 (1985-05-01), Laurence
patent: 4543453 (1985-09-01), Brander
patent: 5025214 (1991-09-01), Lee

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