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Cable detection apparatus and method

  • US 7,235,980 B2
  • Filed: 03/21/2006
  • Issued: 06/26/2007
  • Est. Priority Date: 03/31/2003
  • Status: Active Grant
First Claim
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1. A method of noise reduction in a cable detection apparatus, the method comprising:

  • filtering a cable detection input signal to increase the relative strength of signal components at a plurality of harmonics of a first frequency to at least one non-harmonic frequency between two of said harmonics of the first frequency;

    frequency shifting the filtered signal to frequency shift the high relative strength frequencies of the filter to coincide with reduced relative strength frequencies of the filtered signal; and

    emitting electromagnetic radiation substantially at at least one frequency corresponding to reduced strength frequencies of the filtered signal.

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