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. 24, 2002
Filed:
Mar. 31, 1999
Michael Walker, Baltmannsweiler, DE;
Hans Jürgen Matt, Remseck, DE;
Armin Mann, Stuttgart, DE;
Fritz Weinschenk, Aichwald, DE;
Holger Söhnle, Mönsheim, DE;
Alcatel, Paris, FR;
Abstract
A compander circuit ( ) for echo cancellation in telecommunications apparatus with an estimator module ( ) for estimating an echo coupling and a delay of a line echo and a characteristic module ( ) with an associated multiplier ( ) for controlling the short-time output level of z (k) as a function of the short-time input level of z (k) is characterized in that at all inputs and outputs of the compander circuit ( ), a plurality of N communications channels are applied and outputted, respectively, at an N-fold clock rate as compared with a single communications channel; that all memory units in the compander circuit ( ) are designed as multiplexer-buffer-demultiplexer (MBD) units ( ); and that a modulo-N counter ( ) is provided which controls all MBD units ( ) so that in each of the MBD units ( ), always the same memory cell ( ) assigned to a particular communications channel is addressed.