Method and device for sound activity detection and sound signal classification
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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 longterm correlation map, wherein the longterm 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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Abstract
A device and method for estimating a tonal stability of a sound signal include: calculating a current residual spectrum of the sound signal; detecting peaks in the current residual spectrum; calculating a correlation map between the current residual spectrum and a previous residual spectrum for each detected peak; and calculating a longterm correlation map based on the calculated correlation map, the longterm correlation map being indicative of a tonal stability in the sound signal.
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41 Claims

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 longterm correlation map, wherein the longterm 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.  View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)


30. A device for estimating a tonal stability tonal stability of a sound signal using a frequency spectrum of the sound signal, the device comprising:

means for 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; means for 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; means for 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 means for identifying the tonal stability of the sound signal based on calculating a longterm correlation map, wherein the longterm correlation map is calculated based on an update factor, the correlation map of a current frame, and an initial value of the longterm correlation map.  View Dependent Claims (35)


31. A device for estimating a tonal stability tonal stability of a sound signal using a frequency spectrum of the sound signal, the device comprising:

a calculator of 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; a detector of 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; a calculator of 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 a calculator identifying the tonal stability of the sound signal based on calculating a longterm correlation map, wherein the longterm correlation map is calculated based on an update factor, the correlation map of a current frame, and an initial value of the longterm correlation map.  View Dependent Claims (32, 33, 34, 36, 37, 38, 39, 40, 41)

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