Method and apparatus for a variable bandwidth multi-protocol...

Details Method and apparatus for a variable bandwidth multi-protocol... Method and apparatus for a variable bandwidth multi-protocol...

2001-04-18

2008-01-01

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Transceivers

Modems

C375S316000, C375S340000, C375S267000, C375S343000, C370S468000, C370S334000, C370S465000, C455S103000, C455S422100, C455S069000

Reexamination Certificate

active

07315571

ABSTRACT:
A transceiver for communicating a multi-tone modulated communication channel on a subscriber line. The transceiver includes: a digital signal processor (DSP) with a Fourier transform module and an analog front end (AFE). The DSP determines an available range of frequencies on the subscriber line and expands or contracts the tone spacing of each of a fixed number “N” of tones accordingly by decreasing or increasing the processing interval associated with the Fourier transform of each tone set. The AFE performs digital-to-analog conversion of the multi-tone modulated communication channel at rates compatible with the processing interval of the Fourier transform module; whereby the range of frequencies spanned by the modulated tones on the subscriber line conforms to the available of frequencies on the subscriber line.

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patent: 6314102 (2001-11-01), Czerwiec et al.
patent: 6466088 (2002-10-01), Rezvani et al.
patent: 6512739 (2003-01-01), Heidari et al.

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