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. 21, 2000
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. A digital subscriber line modem utilizes either constant envelope modulation or quadrature amplitude modulation for outputting DSL signals upstream to a central office. When a telephone in the resident's home is detected as being off-hook, then the constant envelope modulation is used by the DSL modem in order to lessen the intermodulation product distortion that results in audible noise heard by a user of the telephone. When the telephone is on-hook, then another type of modulation, such as QAM, is used to maximize the upstream data rate capability in the DSL frequency band, since any noise generated by the QAM is not a problem due to the non-use of the POTS frequency band.