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Table 3 Instrumental measures for baseline and proposed approaches averaged over unseen noise types of the test set data. Note that the SNR conditions of −5 and 15 dB are unseen during training, whereas the remaining SNRs have been seen. Best two approaches are in boldface, high-complexity reference LSTM-cMSA+CLED-cSA-du excluded

From: Speech enhancement by LSTM-based noise suppression followed by CNN-based speech restoration

SNR

Method

PESQ

STOI

SNRI

−5

Noisy

1.40

0.55

0.00

 

MMSE-LSA

1.39

0.51

3.01

 

SG-jMAP

1.38

0.51

4.13

 

LSTM-IRM

1.60

0.63

9.42

 

LSTM-MSA

1.62

0.65

11.05

 

LSTM-cMSA

1.57

0.64

13.65

 

CED-cSA-du

1.55

0.67

11.59

 

LSTM-cMSA + DNN-cSA

1.57

0.67

14.85

 

LSTM-cMSA + CED-cSA-du

1.59

0.69

14.98

 

LSTM-cMSA + CED-cSA-tr

1.59

0.69

15.15

0

Noisy

1.59

0.68

0.00

 

MMSE-LSA

1.65

0.65

3.74

 

SG-jMAP

1.64

0.65

4.47

 

LSTM-IRM

1.95

0.78

13.44

 

LSTM-MSA

2.01

0.80

14.96

 

LSTM-cMSA

1.98

0.80

19.12

 

CED-cSA-du

1.89

0.82

16.33

 

LSTM-cMSA + DNN-cSA

1.99

0.83

20.94

 

LSTM-cMSA + CED-cSA-du

2.04

0.85

20.94

 

LSTM-cMSA + CED-cSA-tr

2.05

0.85

21.27

5

Noisy

1.86

0.80

0.00

 

MMSE-LSA

1.98

0.77

4.41

 

SG-jMAP

1.98

0.78

5.35

 

LSTM-IRM

2.39

0.88

15.70

 

LSTM-MSA

2.48

0.89

17.35

 

LSTM-cMSA

2.49

0.89

22.07

 

CED-cSA-du

2.39

0.91

19.73

 

LSTM-cMSA + DNN-cSA

2.53

0.91

24.45

 

LSTM-cMSA + CED-cSA-du

2.61

0.92

24.11

 

LSTM-cMSA + CED-cSA-tr

2.63

0.93

24.71

10

Noisy

2.22

0.89

0.00

 

MMSE-LSA

2.37

0.86

4.85

 

SG-jMAP

2.40

0.87

6.06

 

LSTM-IRM

2.84

0.93

16.58

 

LSTM-MSA

2.93

0.94

18.20

 

LSTM-cMSA

2.97

0.94

23.19

 

CED-cSA-du

2.96

0.95

23.40

 

LSTM-cMSA + DNN-cSA

3.03

0.95

25.88

 

LSTM-cMSA + CED-cSA-du

3.12

0.96

25.11

 

LSTM-cMSA + CED-cSA-tr

3.15

0.96

26.06

15

Noisy

2.65

0.95

0.00

 

MMSE-LSA

2.77

0.92

4.88

 

SG-jMAP

2.86

0.93

6.36

 

LSTM-IRM

3.27

0.97

15.76

 

LSTM-MSA

3.35

0.97

17.92

 

LSTM-cMSA

3.39

0.97

22.66

 

CED-cSA-du

3.44

0.97

25.69

 

LSTM-cMSA + DNN-cSA

3.41

0.97

25.42

 

LSTM-cMSA + CED-cSA-du

3.50

0.97

24.24

 

LSTM-cMSA + CED-cSA-tr

3.54

0.98

25.55

Mean

Noisy

1.94

0.77

0.00

 

MMSE-LSA

2.03

0.74

4.18

 

SG-jMAP

2.05

0.75

5.27

 

LSTM-IRM

2.41

0.84

14.19

 

LSTM-MSA

2.48

0.85

18.12

 

LSTM-cMSA

2.48

0.85

20.14

 

CED-cSA-du

2.44

0.86

19.35

 

LSTM-cMSA + DNN-cSA

2.51

0.87

22.30

 

LSTM-cMSA + CED-cSA-du

2.57

0.88

21.88

 

LSTM-cMSA + CED-cSA-tr

2.59

0.88

22.54

 

LSTM-cMSA + CLED-cSA-du [39]

2.62

0.89

22.47