The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 1993
Filed:
Jul. 15, 1991
Gerhard Krauss, Nuermberg, DE;
Siemens Aktiengesellschaft, Munich, DE;
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.