| 摘要 |
PROBLEM TO BE SOLVED: To accurately determine whether music or speech is included in a sound signal, and to perform proper scene determination for a listener. SOLUTION: In a music detection device 1 of the invention, a music scale spectrum calculation section 11 calculates a spectrum of each frequency of an equal temperament scale from the sound signal, for each frame in which a predetermined period of the sound signal is expressed, and an autocorrelation coefficient calculation section 12 calculates autocorrelation value of the spectrum. A variance calculation section 16 digitizes a size of variation of a maximum of the autocorrelation value which is detected by a coefficient maximum detection section 13, and the maximum of the autocorrelation value in a succeeding plurality of frames. When the size of variance is smaller than a threshold which is determined beforehand, a music/non-music determination section 17 determines that the sound signal is music. COPYRIGHT: (C)2009,JPO&INPIT
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