Method and device for sound activity detection and sound signal classification

  • US 8,990,073 B2
  • Filed: 06/20/2008
  • Issued: 03/24/2015
  • Est. Priority Date: 06/22/2007
  • Status: Active Grant
First Claim
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1. A method for estimating a tonal stability of a sound signal using a frequency spectrum of the sound signal, the method comprising:

  • calculating a current residual spectrum of the sound signal by subtracting from the frequency spectrum of the sound signal a spectral floor defined by minima of the frequency spectrum;

    detecting a plurality of peaks in the current residual spectrum as pieces of the current residual spectrum between pairs of successive minima of the current residual spectrum;

    calculating a correlation map between each detected peak of the current residual spectrum and a shape in a previous residual spectrum corresponding to the position of the detected peak; and

    identifying the tonal stability of the sound signal based on calculating a long-term correlation map, wherein the long-term correlation map is calculated based on an update factor, the correlation map of a current frame, and an initial value of the long term correlation map.

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