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. 26, 2002
Filed:
Jan. 21, 2000
Mansour Tahernezhaadi, Naperville, IL (US);
Michael J. Kirk, Mount Prospect, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A system and method for controlling echo using zero echo path, ringing, and off-hook detection. When conditions for zero echo path are detected, the present embodiment bypasses echo cancellation by replacing the output signal with the input to the echo canceller. In addition, the present embodiment also provides ringing and off-hook detection which additionally evaluate when the output signal should be replaced by the input to the echo canceller. The system and method provides additional detection and control benefits to echo cancellers and can be implemented in echo cancellation systems without substantial change to the existing echo canceller.