Digital transmitter
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United States of America Patent
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Nov 13, 2012
Grant Date -
Aug 18, 2011
app pub date -
Apr 21, 2011
filing date -
Jun 20, 1997
priority date (Note) -
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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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