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Method and apparatus for detecting the presence of a DTV pilot tone in a high noise environment

  • US 8,949,061 B2
  • Filed: 07/13/2011
  • Issued: 02/03/2015
  • Est. Priority Date: 07/13/2011
  • Status: Expired due to Fees
First Claim
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1. A method of detecting the presence of a digital television (DTV) pilot tone in a high noise environment, comprising:

  • computing a power average of a plurality of Fast Fourier Transform (FFT) output spectra of a digital baseband signal derived from a TV band channel to create a power averaged output spectrum;

    estimating a power peak in the power averaged output spectrum;

    computing based upon the estimated power peak, an adjustment parameter to adjust the signal to center the power peak in a Discrete Fourier Transform (DFT) bin of the FFT output spectra;

    applying the computed parameter to adjust the signal;

    computing a coherent average of FFT output spectra of the adjusted signal;

    computing a power spectrum of the coherent averaged output spectrum;

    testing the power spectrum for the DTV pilot tone by identifying a peak power in the power spectrum of the coherent averaged output spectrum; and

    determining whether the test exceeds a threshold.

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