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:
Mar. 31, 2009
Filed:
Jun. 09, 2006
David R. Mandelstam, Thornhill, CA;
David R. Mandelstam, Thornhill, CA;
Abstract
An apparatus and method for disabling an echo canceller in a communication channel is external to the echo canceller. The average power of the received signal is compared to the average power of the transmitted signal and if the received signal is more than 26 dB below the transmitted signal, then it is determined that echo cancellation is not required. If the received signal is less than 6 dB below the transmitted signal, then there is double talk present and a determination can not be made. The invention provides a low cost system for controlling echo cancellers and can continue to monitor echo during a call. The invention is well suited to implementation on a field programmable gate array (FPGA) or application specific integrated circuit (ASIC).