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Noise detection for audio encoding by mean and variance energy ratio

  • US 7,457,747 B2
  • Filed: 08/23/2004
  • Issued: 11/25/2008
  • Est. Priority Date: 08/23/2004
  • Status: Expired due to Fees
First Claim
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1. A method for estimating and detecting noise and noise-like spectral signal segments, the signal segments corresponding to one or more frequency bands of a signal, the method comprising:

  • calculating mean and variance energies for each frequency band of a signal;

    defining boundaries for a ratio of the mean and variance energies in each frequency band of the signal; and

    determining if each frequency band of the signal is noise or noise-like using the defined boundaries and a stage of two or more decisions.

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