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AssigneeConexant Systems, Inc.
InventorsKenneth D. Ko, David O. Anderton, Ismail I. Eldumiati, Steven A. Gronemeyer, Don L. Harmer, P. Michael Henderson, Joel D. Peshkin, Raphael Rahamim, Frederic M. Stubbe, John S. Walley, Kenneth S. Walley, Yongbing Wan, Edward S. Zuranski, Jamal Haque, Anthony A. Tzouris, Shrenik P. Patravali, Ganning Yang
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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.
A digital subscriber line modem adapted to be coupled directly to a subscriber line, the modem being capable of simultaneous access to the subscriber line with other telephone equipment operating in a first frequency band, the modem comprising:
A telephone communication system includes a subscriber line between a telephone central office and a remote location, the remote location being capable of transmitting and receiving both POTS signals within a first frequency band and DSL signals within a second frequency band over the subscriber line at the same time without using a splitter at the remote location, the system comprising:
A method of providing simultaneous communication over a telephone subscriber line, the simultaneous communication including at least a first signal in a first frequency band that is either being sent to or received from a telephone, and a second signal in a second frequency band that is higher than the first frequency band, the second signal being sent from a modem, the method comprising the step of:
Dependencies are inferred from the claim text.