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. 14, 2006
Filed:
Nov. 21, 2000
Hans-jürgen Matt, Remseck, DE;
Michael Walker, Baltmannsweiler, DE;
Michael Maurer, Waiblingen, DE;
Alcatel, Paris, FR;
Abstract
Method for the reduction of echo and/or noise signals in TK systems for the transmission of useful acoustic signals, in which, when a silence interval is present, the distorted useful signal is modified by a time-dependent control signal a(t) or by a control signal a(k) cycled in the rhythm of a scan rate f=1/T. The control signal a(k) is varied in such manner that, during the presence of speech signals in the useful signals, the amplitude of the control signal a(k) is set to a predetermined constant value cand, when a silence interval begins, the amplitude of the control signal a(k) is reduced continuously from one sample value to the next in accordance with the recurrence formula a(k+1)=a(k).β with β<1. After the end of the silence interval, a(k) is again set equal to c.