[Retracted] Waveform Feature Extraction of Intelligent Singing Skills under the Background of Internet of Things

Table 2

Pitch extraction results of different music.

Song name	Category	Music length (s)	Actual number of notes	Detect the number of notes	Number of misdetected notes	Number of missing notes
Chopin valse	Waltz	47	67	67	1	1
Waltz of flowers	Waltz	19	27	28	0	1
The last waltz	Slow three	17	25	27	1	1
Soul broken blue bridge	Slow three	27	41	41	2	0
Hawthorn	Middle three	41	60	63	1	0
I care about you	Middle three	29	46	45	1	2
Vienna forest	Fast three	19	32	33	3	2
Danube night	Fast three	48	75	74	1	2
Patrol	March	30	49	48	2	3
Schubert	March	50	83	83	3	3