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:
Apr. 03, 2001
Filed:
Jan. 27, 1998
Robert E. Scott, Largo, FL (US);
E. Robert Lastinger, Jr., Hillsborough, FL (US);
Paradyne Corporation, Largo, FL (US);
Abstract
An echo canceler disabling system is associated with a cellular data communications device, such as a modem, which is utilized to communicate digital data over a cellular network for the purpose of enhancing digital data communications over the network. The echo canceler disabling system is configured to disable voice echo cancelers brought on-line during digital data transmission after call startup in order to prevent disruption of digital data communications by the voice echo cancelers. To deactivate the voice echo cancelers, the echo canceler disabling system is configured to transmit a tone at approximately 2100 Hz with 180 degree phase reversals to disable one or more echo cancelers brought on-line after the call startup. In architecture, the echo canceler disabling system includes a mechanism to detect a loss of signal synchronization, a mechanism to send an echo canceler disable tone, and a mechanism to send a retrain signal after the echo canceler disable tone is sent in order to reestablish signal synchronization.