	US 12,080,262 B2
	Musical piece analysis device, program, and musical piece analysis method
Shiro Suzuki, Yokohama (JP); and Toshihisa Sabi, Yokohama (JP)
Assigned to ALPHATHETA CORPORATION, Yokohama (JP)
Appl. No. 17/619,412
Filed by AlphaTheta Corporation, Yokohama (JP)
PCT Filed Jun. 17, 2019, PCT No. PCT/JP2019/023929 § 371(c)(1), (2) Date Dec. 15, 2021, PCT Pub. No. WO2020/255214, PCT Pub. Date Dec. 24, 2020.
Prior Publication US 2022/0262331 A1, Aug. 18, 2022
Int. Cl. G10H 1/057 (2006.01); G10H 1/00 (2006.01); G10H 1/40 (2006.01)

CPC G10H 1/0575 (2013.01) [G10H 1/0025 (2013.01); G10H 1/40 (2013.01); G10H 2210/081 (2013.01)]

8 Claims

1. A music piece analyzer comprising:

a key candidate determiner configured to analyze music data to determine key candidates; and

a key selector configured to:

extract each one of the key candidates as an extracted key candidate;

for each of the key candidates as the extracted key candidate, detect, from among the key candidates other than the extracted key candidate, those key candidates that are related keys supposing that the extracted key candidate is a main key, and calculate a related key score in accordance with a number of key candidates that are detected as related keys; and

select a key of the music piece from among the key candidates in accordance with the related key score calculated for each of the key candidates.