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Multirate wire line modem apparatus

  • US 5,177,734 A
  • Filed: 12/10/1990
  • Issued: 01/05/1993
  • Est. Priority Date: 05/02/1988
  • Status: Expired due to Fees
First Claim
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1. Echo cancellation apparatus for removing echo in received information comprising:

  • a sample delay line having a plurality of taps;

    means for applying a transmit signal to said sample delay line, means for developing a cross correlation column vector between a given number of samples of said transmit signal over a given number of frames according to a tap position;

    means for obtaining a new vector corresponding to the dot product function of an inverse transmit auto correlation matrix and said cross correlation column vector for each tap;

    means for summing said new vector with said cross correlation column vector to obtain an echo estimate from the summed new vectors at each tap;

    andmeans for subtracting said echo estimate from said received information to develop modified received information with reduced echo.

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