Table 1.

Overview of the extracted features, divided according to the domain of analysis

Region	Study	Feature	Information
Entire signal	[22]	IEDCC(1–6)	Vocal tract and vocal folds abnormalities [22]
	[3, 10, 12]	Zero crossing rate${}^H$	Voice activity (Details in [1])
	[10, 16, 22]	DFA${}^H$	Self-similarity of the voice (Details in [14])
Voiced	[16]	Bandwidth${}^L$	Frequency range
	[10, 16, 43]	Harmonic ratio${}^L$	Ratio of signal over noise [16]
	[10, 16, 43]	F0${}^L$	Vocal folds vibration and frequency alteration
	[46]	Spectral features: flux${}^L$, skewness${}^L$, entropy${}^L$, crest${}^L$, flatness${}^L$, slope${}^L$, roll off${}^L$, spread${}^L$, centroid${}^L$, kurtosis${}^L$	Spectrum shape information (Details in [1])
	[6]	LPC(1–3)${}^L$	Formants and resonances (Details in [1])
	[10]	Short time energy ${}^L$	Energy variation among frames
	[16, 45, 46]	MFCC(1–13)${}^L$, $\Delta$ MFCC(1–13)${}^L$, $\Delta \Delta$MFCC(1–13)${}^L$,	Subtle changes in the motion of articulators (Details [32, 42])
Transition	Present study	PTS	Ability to promptly interrupt/start vocal fold vibration
	Present study	ETS	Ability to promptly interrupt/start vocal fold vibration
	[34]	MFCC(1–12), $\Delta$MFCC(1–12), $\Delta \Delta$MFCC(1–12),	Ability to promptly interrupt/start vocal fold vibration
	[34]	BBE(1–25)	Ability to promptly interrupt/start vocal fold vibration

The apex letter represents the classification between LLf and HLf subgroups