Characterizing signal representing audio content involves determining measure of tonality of signal from spectral component and producing information re tonality of signal based on measure

摘要

The method involves determining a measure of the tonality of the signal and producing information re the tonality of the signal based on the measure. The measure of the tonality of the signal is derived from a quotient relating two summations of an exponentiated spectral component between upper and lower frequencies, whereby the components are both raised to different powers. AN Independent claim is also included for the following: an arrangement for generating an indexed signal with an audio content.