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:
Nov. 09, 1999
Filed:
Mar. 06, 1997
Applicant:
Inventors:
Christopher Michael Forrester, Ottawa, CA;
Paul Vincent Coverdale, Nepean, CA;
Assignee:
Nortel Networks Corporation, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ; H04M / ;
U.S. Cl.
CPC ...
370278 ; 370286 ; 370296 ; 379389 ; 379409 ; 379420 ;
Abstract
A method of increasing the terminal coupling loss in a digital half-duplex handsfree terminal is provided. When the terminal receive channel is active an idle code which is effectively zero is transmitted by an idle code generator. When the terminal transmit channel is active a normal speech signal is transmitted. To determine which channel is active, a receive speech signal level is measured at the receive channel input, and a 'virtual' transmit speech signal is computed from a signal in the transmit channel before the idle code generator.