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Method and apparatus for recognizing a test signal and determining signal transfer characteristics therefrom

  • US 5,749,047 A
  • Filed: 04/05/1995
  • Issued: 05/05/1998
  • Est. Priority Date: 09/20/1991
  • Status: Expired due to Term
First Claim
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1. A method for recognizing, in an electrical signal on an electrical signal transfer channel having an electrical signal input and an electrical signal output, a test signal comprising at least several distinct, substantially sinusoidal frequency components and using said test signal to determine the electrical signal transfer characteristic of said electrical signal transfer channel, comprising:

  • (a) inserting said test signal at said electrical signal input for a selected period of time;

    (b) receiving at said electrical signal output the electrical signal,(c) performing a time-to-frequency transformation of said electrical signal to determine its spectral characteristics;

    (d) comparing said spectral characteristics of said electrical signal to spectral characteristics of said test signal to determine, without foreknowledge, whether said test signal has been inserted; and

    (e) where it is determined that said test signal has been inserted, thereafter analyzing said test signal to determine an electrical signal transfer characteristic of said electrical signal transfer channel.

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