Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2006-08-29
2006-08-29
Ghebretinsae, Temesghen (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S229000, C333S02800T
Reexamination Certificate
active
07099404
ABSTRACT:
An equalizer provided in a digital transmitter compensates for attenuation in a signal channel to a digital receiver. The equalizer generates signal levels as a logical function of bit history to emphasize transition signal levels relative to repeated signal levels. The preferred equalizer includes an FIR transition filter using a look-up table. Parallel circuits including FIR filters and digital-to-analog converters provide a high speed equalizer with lower speed circuitry. The equalizer is particularly suited to in-cabinet and local area network transmissions where feedback circuitry facilitates adaptive training of the equalizer.
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Ghebretinsae Temesghen
Hamilton Brook Smith & Reynolds P.C.
Massachusetts Institute of Technology
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