Semantic structures of timbre emerging from social and acoustic descriptions of music

EURASIP Journal on Audio, Speech, and Music Processing

Table 3 Selected 20 acoustic features

Domain	Name	Σ	*MDA*
Rhythm	Attack time	M	0.23
		SD	0.08
	Fluctuation centr.	M	0.63
	Fluctuation peak	M	0.58
Spectral	Brightness	SD	0.39
	Entropy	SD	0.66
	Flatness	SD	0.60
	Regularity	M	0.33
		SD	0.26
	Roll-off	SD	0.06
	Roughness	M	0.75
	Spread	M	0.54
Spectro-	Spectral flux	M	1.20
Temporal		SD	0.44
Tonal	Chromagram centr.	M	0.98
		SD	0.35
	Chromagram peak	M	0.60
	Harmonic change	M	0.50
		SD	0.61
	Key clarity	M	0.07

Σ stands for the summary measure, where M = mean and SD = standard deviation. MDA is the Mean Decrease Accuracy in classification of the five meta-clusters by the acoustic features using RF.