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Combined echo canceller and time domain equalizer

  • US 6,266,367 B1
  • Filed: 05/28/1998
  • Issued: 07/24/2001
  • Est. Priority Date: 05/28/1998
  • Status: Expired due to Term
First Claim
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1. A combined echo canceller and equalizer for use in a transceiver that is matched to a distant end transceiver, wherein the echo canceller removes a local echo signal from a received signal and the equalizer removes channel distortion from the received signal, said combined echo canceller and equalizer comprising:

  • a digital data source;

    a local training sequence source;

    a hybrid circuit having a full duplex port for connection to a two-wire transmission line over which data signals are sent and received, a transmit port connected to said digital data source, and a receive port;

    a front-end pole canceling filter connected to said receive port;

    an echo canceller filter connected to said digital data source;

    a first summer connected to said echo canceller filter and said front-end pole canceling filter;

    a channel pole canceling filter connected to said first summer;

    a channel zero canceling filter connected to said local training sequence source;

    a second summer connected to said channel pole canceling filter and said channel zero canceling filter, and having an output for providing a partially equalized and substantially echo free signal.

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