频率

衰减

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标准

测量

标准

测量

标准

测量

标准

测量

标准

测量

1

≤1.84

≤1.82

≥74.30

≥83.99

≥67.80

≥76.63

≥72.30

≥82.48

≥64.80

≥73.83

4

≤3.69

≤3.54

≥65.27

≥76.92

≥55.76

≥65.43

≥63.27

≥74.37

≥52.76

≥63.87

8

≤5.26

≤5.03

≥60.75

≥69.42

≥49.74

≥57.57

≥58.75

≥67.09

≥46.74

≥56.77

10

≤5.89

≤5.64

≥59.30

≥67.32

≥47.80

≥60.62

≥57.30

≥65.17

≥44.80

≥56.69

16

≤7.51

≤7.21

≥56.24

≥67.58

≥43.72

≥55.81

≥54.24

≥64.29

≥40.72

≥52.87

20

≤8.43

≤8.11

≥54.78

≥63.01

≥41.78

≥52.75

≥52.78

≥61.17

≥38.78

≥51.14

25

≤9.47

≤9.11

≥53.33

≥61.92

≥39.84

≥52.47

≥51.33

≥60.70

≥36.84

≥50.64

31.25

≤10.64

≤10.23

≥51.88

≥60.04

≥37.90

≥46.05

≥49.88

≥57.75

≥34.90

≥44.08

62.5

≤15.36

≤14.65

≥47.36

≥56.34

≥31.88

≥40.82

≥45.36

≥53.43

≥28.88

≥38.72

100

≤19.78

≤18.73

≥44.30

≥50.77

≥27.80

≥38.50

≥42.30

≥49.19

≥24.80

≥35.92

200

≤28.97

≤26.94

≥39.78

≥44.41

≥21.78

≥27.01

≥37.78

≥42.17

≥15.78

≥25.98

250

≤32.84

≤30.40

≥38.33

≥42.49

≥19.84

≥26.41

≥36.33

≥39.95

≥16.84

≥24.60