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Table 2 The SNR improvement for various threshold values and functions

From: ECG signal performance de-noising assessment based on threshold tuning of dual-tree wavelet transform

Threshold function SNR in (dB) Th 1 Th 2 Th 3 Th 4 Th 5 Th 6 Th 7
Soft −5 3.20389 8.98377 0.25384 1.62297 1.47873 8.25054 9.91075
0 3.20123 8.53072 0.25589 1.61892 1.47919 4.49104 8.72283
5 3.19821 7.74215 0.26424 1.63262 1.50036 −0.02684 6.82608
S–S −5 1.68416 3.31768 0.00031 0.02849 0.01377 8.51847 11.02541
0 1.67689 3.33545 0.00033 0.03438 0.01846 4.55702 10.40910
5 1.66978 3.50081 0.00042 0.05118 0.02850 −0.02684 9.22058
HYP −5 2.35838 5.39335 0.00599 0.23616 0.18567 8.49517 10.96391
0 2.35281 5.34901 0.00627 0.24495 0.19283 4.56183 10.45635
5 2.34758 5.38295 0.00713 0.27530 0.21732 −0.02684 9.39921
N-NG −5 2.80969 7.16647 0.01163 0.42158 0.34169 8.31101 10.62271
0 2.80490 7.04860 0.01217 0.43125 0.35085 4.50462 10.16068
5 2.80054 6.89711 0.01375 0.47023 0.38413 −0.02684 9.03560
Hard −5 1.42053 2.61142 0.00031 0.01829 0.00901 8.87432 10.86859
0 1.41609 2.60485 0.00029 0.02486 0.01048 4.67213 10.25426
5 1.40484 2.77515 0.00042 0.03542 0.02116 −0.02684 9.32698