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Echo canceller with dynamically positioned adaptive filter taps

  • US 4,823,382 A
  • Filed: 10/01/1986
  • Issued: 04/18/1989
  • Est. Priority Date: 10/01/1986
  • Status: Expired due to Term
First Claim
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1. A method of allocating filter taps in an echo canceller for a transmission line comprising the steps of:

  • storing a plurality of samples of a signal representative of said transmission line'"'"'s impulse response in a memory;

    examining said plurality of stored samples to find variable sized ranges of samples of said impulse response having at least a predetermined amount of echo energy, said examining step including computing a center of echo of each of said ranges of said samples in order to find the approximate center of each of said ranges of samples of impulse response containing echo energy; and

    allocating a variable total number of filter taps of said echo canceller by turning on only those taps corresponding to said ranges of samples having at least said predetermined amount of echo energy.

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