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:
Jan. 02, 2001
Filed:
Jul. 27, 1999
Kenichi Okazaki, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
There are provided two line monitoring resistors,of high resistance (Rt1, Rt2) branched at nodes,from subscriber line (LN),in line circuit (LC),and connected between each node and earth, and arithmetic operation unit (EP),into which terminal voltages Vt1, Vt2 of line monitoring resistors,are inputted. Arithmetic operation unit,monitors Vt1, Vt2 for a predetermined time when subscriber terminal,is in on-hook, and hence detects unbalance of DC voltage of both lines and voltage induced on subscriber line,to estimate line resistance. When the subscriber terminal is off-hook, line resistance of the line is estimated using a difference between a theoretical value of Vt1, Vt2 when the line is open and silent and a corrected value in a silent state when the sound component is removed.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile