Pulse or digital communications – Cable systems and components
Reexamination Certificate
2007-08-07
2007-08-07
Ha, Dac V. (Department: 2611)
Pulse or digital communications
Cable systems and components
C375S220000, C375S222000, C375S350000, C370S282000, C370S286000, C455S307000
Reexamination Certificate
active
11094487
ABSTRACT:
An analog front end for communicating discrete multitone modulated signals on a subscriber line includes a transmit block, a receive block, and a hybrid packaged within a same integrated circuit. Upstream data to be transmitted to the subscriber line is pre-processed to eliminate even images. A power spectral density shaping filter subsequently substantially eliminates undesired energy in the upstream data signal. A high pass filter further rejects upstream data from the downstream data signal. The power spectral density filter and the high pass filter enable the use of a first order hybrid network for extracting the downstream data. The analog front end may include an additional analog channel to enable voiceband (e.g., v.90) communication concurrent with non-voiceband (e.g., xDSL) operation. Sample rate conversion is utilized to avoid the use of multiple independent clocks for otherwise incompatible clocking requirements.
REFERENCES:
patent: 6028891 (2000-02-01), Ribner et al.
patent: 6067316 (2000-05-01), Amrany et al.
Davis William D.
Davis & Associates
Ha Dac V.
Silicon Laboratories Inc.
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