Table 3.

The Bhattacharyya coefficients of frequency features defined in [1] compared to present study. The improvement is calculated as $\frac{\left(B_{{coef}_{OLD}}-B_{{coef}_{NEW}}\right)}{B_{{coef}_{OLD}}}·100$.

Class Combination	Bhattacharyya Coefficient
	P1 (50–250 Hz)	P2 (250–450 Hz)	F470 (470 Hz)	F780 (780 Hz)	The Best Feature from Table 1	Improvement (%)
ctrl, cmp1	0.964	0.960	0.951	0.963	0.842	11.46
ctrl, cmp2	0.906	0.795	0.924	0.943	0.659	17.11
ctrl, cmp3	0.549	0.668	0.837	0.947	0.316	42.44
ctrl, oa	0.582	0.516	0.860	0.943	0.308	40.31
cmp1, cmp2	0.942	0.874	0.936	0.904	0.717	17.96
cmp1, cmp3	0.607	0.782	0.882	0.955	0.442	43.48
cmp1, oa	0.670	0.635	0.901	0.948	0.401	36.85
cmp2, cmp3	0.809	0.881	0.952	0.965	0.637	21.26
cmp2, oa	0.809	0.809	0.950	0.951	0.594	26.58
cmp3, oa	0.924	0.962	0.985	0.980	0.876	5.19