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. 27, 2004
Filed:
Nov. 22, 2000
Stefan Barkarö, Solna, SE;
Albin Johansson, Haninge, SE;
Telefonaktiebolaget LM Ericsson, Stockholm, SE;
Abstract
For signal level adjustment of a multitone signal received over a transmission line ( ) during a training sequence in a DSL system, a programmable high-pass filter ( ) is connected to the transmission line ( ). A programmable gain control unit ( ) is connected between the filter ( ) and an A/D converter ( ). A digital signal processor ( ) is connected with its inputs to the A/D converter ( ), with control outputs ( ) to control inputs ( ) of the filter ( ), and with control outputs ( ) to control inputs ( ) of the gain control unit ( ). The processor ( ) detects signal level differences between the highest and the lowest tone of the multitone signal and programs the filter ( ) to make the signal levels of the highest and the lowest tone equal. The processor ( ) furthermore programs the gain control unit ( ) to adjust its total signal output level to coincide with the dynamic range of the A/D converter ( )