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:
Apr. 12, 1994
Filed:
Jul. 07, 1992
Applicant:
Inventors:
Leo Larsen, Kokkedal, DK;
Jens Madsen, Ballerup, DK;
Assignee:
GN Netcom A/S, Copenhagen NV, DK;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03G / ; H03G / ; A61F / ; H04B / ;
U.S. Cl.
CPC ...
381106 ; 381 72 ; 381108 ; 333 14 ;
Abstract
An audio frequency compressing system for amplifying an input signal to produce a power output signal while removing high-level signals which could harm a listener. Gain control in the feedback path of an amplifier includes both a gain controller circuit for supplying a constant feedback impedance and a plurality of resistors which can be coupled to the gain controller circuit to increase or decrease the feedback impedance. Coupling of the resistors to the gain controller circuit is controlled by a feedback control circuit having both an automatic gain control circuit and a continuous high-level protection circuit.