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Echo measurement arrangement

  • US 4,947,425 A
  • Filed: 10/27/1989
  • Issued: 08/07/1990
  • Est. Priority Date: 10/27/1989
  • Status: Expired due to Term
First Claim
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1. Apparatus for ranging and converging on at least one of a plurality of echoes occurring at respective locations along a communications line comprisingmeans for storing in a memory samples of a signal that is being transmitted to said communications line and samples of a signal that is being simultaneously received from said communications line,at least one filtering means having respective coefficients for filtering overlapping sequences of said stored samples of said transmitted signal into a plurality of filtered signals, said one filtering means including means for changing the values of said respective coefficients as a function of each of said filtered signals and respective signals representative of respective ones of said stored received signal samples and for freezing the values of said coefficients when they reach respective final values as an indication that said one filtering means has converged on said at least one echo, andmeans for determining the propagation delay associated with said at least one echo as a function of the effective number of said transmitted signal samples that are filtered up to the point at which said coefficients reach their respective final values.

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