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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