Method and device for characterizing a signal and method and device for producing an indexed signal
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United States of America Patent
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Jan 13, 2009
Grant Date -
Dec 30, 2004
app pub date -
Jul 15, 2002
filing date -
Jul 16, 2001
priority date (Note) -
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Abstract
In a method for characterizing a signal representing an audio content a measure is determined for a tonality of the signal, whereupon a statement is made about the audio content of the signal on the basis of the measure for the tonality of the signal. The measure for the tonality is derived from a quotient whose numerator is the mean of the summed values of spectral components of the signal exponentiated with a first power and whose denominator is the mean of the summed values of spectral components exponentiated with a second power, the first and second powers differing from each other. The measure for the tonality of the signal for the content analysis is robust in relation to a signal distortion, due e.g. to MP3 coding, and has a high correlation with the content of the analyzed signal.
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