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:
Dec. 21, 1999
Filed:
Dec. 13, 1996
Friedbert Stuhlfelner, Leiblfing, DE;
Nokia Technology GmbH, , DE;
Abstract
In a new circuit arrangement for improving the signal-to-noise ratio, the entire audible frequency spectrum is divided into several abutting frequency channels. Each channel supplies the respective signal part in delayed form to an amplifier with controllable amplification. The amplifier's amplification is adjusted as a function of a comparator, so that when the audio frequency signal is below a threshold value during a specified time, the amplification of the controllable amplifier is gradually decreased to the lowest amplification value. Vice versa, when the useful signal again exceeds the threshold value, the amplification is gradually controlled upward to a maximum value.