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. 19, 1995
Filed:
Feb. 13, 1995
Applicant:
Inventor:
Heimo Lahdemaki, Pirkkala, FI;
Assignee:
Nokia Telecommunications OY, Espoo, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ; H04J / ;
U.S. Cl.
CPC ...
370 321 ; 379409 ;
Abstract
A method of preventing an adaptive echo canceler from diverging in a noisy environment, including determining an average noise level (-45 dBmO) in the echo path, determining an attenuation (A.sub.e) of the echo path and preventing an adaptation of the echo canceller, if the level of the signal (x(i)) to be transmitted to the echo path and causing echo (r(i)) is lower than a predetermined threshold level, which is to the extent of a preset margin and the echo path attenuation above the average noise level.