Patent ID: 9570060
Date: 2017-02-14
CPC Classifications: G10H,G10L

Claim:
1. A music signal processing apparatus, comprising: a frequency spectrum transform circuit configured to transform a music signal into a frequency spectrum, the music signal being a signal of a musical piece containing a plurality of parts, the plurality of parts including a first part with a melody, wherein the frequency spectrum indicates a power of the music signal at each of a plurality of frequency values; a filter circuit configured to remove a steep peak of the frequency spectrum, thereby producing a second frequency spectrum that indicates power at at least two frequency values of the plurality of frequency values; a frequency feature amount generation circuit configured to generate, from the second frequency spectrum output from the filter, a frequency feature amount that indicates frequencies from amongst the at least two frequency values in which one or more fundamental frequency components of parts of the plurality of parts are emphasized; and a melody feature amount sequence acquisition circuit configured to identify the first part amongst the plurality of parts by producing, based on a plurality of frequency feature amounts generated by the frequency feature amount generation circuit, at least one melody feature amount sequence that specifies a fundamental frequency of the first part at a plurality of different times.