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:
Dec. 02, 1997
Kenneth D. Ko, Clearwater, FL (US);
David O. Anderton, Rancho Margarita, CA (US);
Ismail I. Eldumiati, Irvine, CA (US);
Steven A. Gronemeyer, Cedar Rapids, IA (US);
Don L. Harmer, Anaheim, CA (US);
P. Michael Henderson, Tustin, CA (US);
Joel D. Peshkin, Irvine, CA (US);
Raphael Rahamim, Orange, CA (US);
Frederic M. Stubbe, Irvine, CA (US);
John S. Walley, Lake Forest, CA (US);
Kenneth S. Walley, Portola Hills, CA (US);
Yongbing Wan, Irvine, CA (US);
Edward S. Zuranski, Largo, FL (US);
Jamal Haque, Tampa, FL (US);
Anthony A. Tzouris, Clearwater, FL (US);
Shrenik P. Patravali, St. Petersburg, FL (US);
Ganning Yang, Irvine, CA (US);
Conexant Systems, Inc., Newport Beach, CA (US);
Abstract
A digital subscriber line (DSL) communication system that utilizes the high frequency band of a standard telephone line does not require the use of a plain old telephone service (POTS) splitter in the resident's home, which provided isolation between the POTS frequency band (0 to 4 kHz) and the DSL frequency band. Digital signal processing techniques are utilized to adapt to varying subscriber line conditions due to POTS telephone equipment. The digital signal processing techniques eliminate the need for a splitter by reducing susceptibility to distortion due to varying subscriber line characteristics. The digital subscriber line modem utilizes constant envelope modulated signals and frequency division multiplexing, where the constant envelope modulations lessens the intermodulation distortion products due to DSL signals that are transmitted by the modem and which may result in audible noise at the POTS telephone equipment due to non-linearities of the POTS telephone equipment.