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Target signal determination method and associated apparatus

  • US 9,313,057 B2
  • Filed: 10/26/2010
  • Issued: 04/12/2016
  • Est. Priority Date: 11/16/2009
  • Status: Active Grant
First Claim
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1. A method using delay correlation for determining whether an input signal is a target signal implemented in a signal receiving electronic device with a non-transitory computer-readable storage medium storing an executable program, comprising:

  • receiving the input signal by the signal receiving electronic device;

    sampling the input signal to generate 2N sample values, wherein the period of the sample values is N, where N is a positive integer;

    obtaining a first value according to a first operation method by processing the 2N sample values by the signal receiving electronic device instructed by the executable program stored in the non-transitory computer-readable storage medium;

    obtaining a second value according to a second operation method by processing the 2N sample values by the signal receiving electronic device instructed by the executable program stored in the non-transitory computer-readable storage medium;

    obtaining a determination value according to a ratio of the first value and the second value, wherein the determination value is a quotient of the first value divided by the second value, and the second value equals Σ

    k=−

    N
    N-1|r(t−

    N−

    k)|2 where r(t) is a sample value at time t; and

    determining whether the input signal is the target signal or not according to the determination value and a threshold; and

    continuing to receive said input signal if said input signal is determined to be said target signal, otherwise, discontinuing receipt of said input signal.

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