Table 12. Average SNR improvement of 10 real ECGs.

Original SNR	Noise Type	Denoising Method
		IEMD -ATD	UT-H	UT-S	Cust-H	Cust-S
-5 dB	ECN	2.79	2.65	2.61	2.63	2.65
	EMG	7.13	5.65	5.86	5.12	6.13
	WN	9.61	6.63	6.54	7.36	8.21
	HN	7.09	6.13	5.63	6.53	6.69
-2 dB	ECN	2.58	2.32	2.25	2.32	2.34
	EMG	7.58	5.17	5.32	4.79	5.59
	WN	8.77	4.70	4.35	6.64	6.80
	HN	6.75	5.74	4.89	6.06	6.09
2 dB	ECN	2.27	1.82	1.65	1.84	1.85
	EMG	6.66	4.40	4.16	3.70	4.46
	WN	7.26	2.60	1.44	5.07	4.56
	HN	5.82	4.79	3.53	5.14	5.03
5 dB	ECN	1.69	1.49	1.17	1.57	1.57
	EMG	5.18	2.89	2.07	2.51	3.08
	WN	5.78	1.41	-0.61	3.71	3.05
	HN	4.77	3.15	2.02	3.45	3.34
10 dB	ECN	0.40	-0.78	-1.25	-0.68	-0.71
	EMG	2.83	0.42	-1.21	0.48	0.82
	WN	3.19	-0.09	-2.41	0.89	0.24
	HN	2.48	0.76	-1.06	1.47	1.23