比率-デシベル(dB)対応表
比率-デシベル 対応表
比率とデシベル(dB)の対応表
比率-デシベル値
比率とデシベル(dB)とを対応表にしました。
注意が必要なのは、dBは用途により、電圧比であったり電力比であったります。電圧比の場合と電力比の場合で値が異なります。
以下に表の見方の例を示します。
- ボリューム等で信号電圧を1/10(0.1)倍した場合の電圧比
- 「比率」欄の0.1の行の「電圧比」欄を参照
- ⇒デシベル値は、-20.00dbになる
- アンプで信号電圧を2倍に増幅させるた場合の電圧比
- 「比率」欄の2.0の行の「電圧比」欄を参照
- ⇒デシベル値は6.021dBになる
- アンプで電力を2倍に増幅させた場合の電力比
- 「比率」欄の2.0の行の「電圧比」欄を参照
- ⇒デシベル値は3.010dBになる
比率 | 電圧比 | 電力比 |
0.001 | -60.00 | -30.00 |
0.002 | -53.98 | -26.99 |
0.003 | -50.46 | -25.23 |
0.004 | -47.96 | -23.98 |
0.005 | -46.02 | -23.01 |
0.006 | -44.44 | -22.22 |
0.007 | -43.10 | -21.55 |
0.008 | -41.94 | -20.97 |
0.009 | -40.92 | -20.46 |
0.01 | -40.00 | -20.00 |
0.02 | -33.98 | -16.99 |
0.03 | -30.46 | -15.23 |
0.04 | -27.96 | -13.98 |
0.05 | -26.02 | -13.01 |
0.06 | -24.44 | -12.22 |
0.07 | -23.10 | -11.55 |
0.08 | -21.94 | -10.97 |
0.09 | -20.92 | -10.46 |
0.1 | -20.00 | -10.00 |
0.2 | -13.98 | -6.990 |
0.3 | -10.46 | -5.229 |
0.4 | -7.959 | -3.979 |
0.5 | -6.021 | -3.010 |
0.6 | -4.437 | -2.218 |
0.7 | -3.098 | -1.549 |
0.8 | -1.938 | -0.969 |
0.9 | -0.915 | -0.458 |
1.0 | 0.000 | 0.000 |
1.1 | 0.828 | 0.414 |
1.2 | 1.584 | 0.792 |
1.3 | 2.279 | 1.139 |
1.4 | 2.923 | 1.461 |
1.5 | 3.522 | 1.761 |
1.6 | 4.082 | 2.041 |
1.7 | 4.609 | 2.304 |
1.8 | 5.105 | 2.553 |
1.9 | 5.575 | 2.788 |
2.0 | 6.021 | 3.010 |
2.1 | 6.444 | 3.222 |
2.2 | 6.848 | 3.424 |
2.3 | 7.235 | 3.617 |
2.4 | 7.604 | 3.802 |
2.5 | 7.959 | 3.979 |
2.6 | 8.299 | 4.150 |
2.7 | 8.627 | 4.314 |
2.8 | 8.943 | 4.472 |
2.9 | 9.248 | 4.624 |
3.0 | 9.542 | 4.771 |
3.1 | 9.827 | 4.914 |
3.2 | 10.10 | 5.051 |
3.3 | 10.37 | 5.185 |
3.4 | 10.63 | 5.315 |
3.5 | 10.88 | 5.441 |
3.6 | 11.13 | 5.563 |
3.7 | 11.36 | 5.682 |
3.8 | 11.60 | 5.798 |
3.9 | 11.82 | 5.911 |
4.0 | 12.04 | 6.021 |
4.1 | 12.26 | 6.128 |
4.2 | 12.46 | 6.232 |
4.3 | 12.67 | 6.335 |
4.4 | 12.87 | 6.435 |
4.5 | 13.06 | 6.532 |
4.6 | 13.26 | 6.628 |
4.7 | 13.44 | 6.721 |
4.8 | 13.62 | 6.812 |
4.9 | 13.80 | 6.902 |
5.0 | 13.98 | 6.990 |
5.1 | 14.15 | 7.076 |
5.2 | 14.32 | 7.160 |
5.3 | 14.49 | 7.243 |
5.4 | 14.65 | 7.324 |
5.5 | 14.81 | 7.404 |
5.6 | 14.96 | 7.482 |
5.7 | 15.12 | 7.559 |
5.8 | 15.27 | 7.634 |
5.9 | 15.42 | 7.709 |
6.0 | 15.56 | 7.782 |
6.1 | 15.71 | 7.853 |
6.2 | 15.85 | 7.924 |
6.3 | 15.99 | 7.993 |
6.4 | 16.12 | 8.062 |
6.5 | 16.26 | 8.129 |
6.6 | 16.39 | 8.195 |
6.7 | 16.52 | 8.261 |
6.8 | 16.65 | 8.325 |
6.9 | 16.78 | 8.388 |
7.0 | 16.90 | 8.451 |
7.1 | 17.03 | 8.513 |
7.2 | 17.15 | 8.573 |
7.3 | 17.27 | 8.633 |
7.4 | 17.38 | 8.692 |
7.5 | 17.50 | 8.751 |
7.6 | 17.62 | 8.808 |
7.7 | 17.73 | 8.865 |
7.8 | 17.84 | 8.921 |
7.9 | 17.95 | 8.976 |
8.0 | 18.06 | 9.031 |
8.1 | 18.17 | 9.085 |
8.2 | 18.28 | 9.138 |
8.3 | 18.38 | 9.191 |
8.4 | 18.49 | 9.243 |
8.5 | 18.59 | 9.294 |
8.6 | 18.69 | 9.345 |
8.7 | 18.79 | 9.395 |
8.8 | 18.89 | 9.445 |
8.9 | 18.99 | 9.494 |
9.0 | 19.08 | 9.542 |
9.1 | 19.18 | 9.590 |
9.2 | 19.28 | 9.638 |
9.3 | 19.37 | 9.685 |
9.4 | 19.46 | 9.731 |
9.5 | 19.55 | 9.777 |
9.6 | 19.65 | 9.823 |
9.7 | 19.74 | 9.868 |
9.8 | 19.82 | 9.912 |
9.9 | 19.91 | 9.956 |
10.0 | 20.00 | 10.00 |
11 | 20.83 | 10.41 |
12 | 21.58 | 10.79 |
13 | 22.28 | 11.14 |
14 | 22.92 | 11.46 |
15 | 23.52 | 11.76 |
16 | 24.08 | 12.04 |
17 | 24.61 | 12.30 |
18 | 25.11 | 12.55 |
19 | 25.58 | 12.79 |
20 | 26.02 | 13.01 |
21 | 26.44 | 13.22 |
22 | 26.85 | 13.42 |
23 | 27.23 | 13.62 |
24 | 27.60 | 13.80 |
25 | 27.96 | 13.98 |
26 | 28.30 | 14.15 |
27 | 28.63 | 14.31 |
28 | 28.94 | 14.47 |
29 | 29.25 | 14.62 |
30 | 29.54 | 14.77 |
31 | 29.83 | 14.91 |
32 | 30.10 | 15.05 |
33 | 30.37 | 15.19 |
34 | 30.63 | 15.31 |
35 | 30.88 | 15.44 |
36 | 31.13 | 15.56 |
37 | 31.36 | 15.68 |
38 | 31.60 | 15.80 |
39 | 31.82 | 15.91 |
40 | 32.04 | 16.02 |
41 | 32.26 | 16.13 |
42 | 32.46 | 16.23 |
43 | 32.67 | 16.33 |
44 | 32.87 | 16.43 |
45 | 33.06 | 16.53 |
46 | 33.26 | 16.63 |
47 | 33.44 | 16.72 |
48 | 33.62 | 16.81 |
49 | 33.80 | 16.90 |
50 | 33.98 | 16.99 |
51 | 34.15 | 17.08 |
52 | 34.32 | 17.16 |
53 | 34.49 | 17.24 |
54 | 34.65 | 17.32 |
55 | 34.81 | 17.40 |
56 | 34.96 | 17.48 |
57 | 35.12 | 17.56 |
58 | 35.27 | 17.63 |
59 | 35.42 | 17.71 |
60 | 35.56 | 17.78 |
61 | 35.71 | 17.85 |
62 | 35.85 | 17.92 |
63 | 35.99 | 17.99 |
64 | 36.12 | 18.06 |
65 | 36.26 | 18.13 |
66 | 36.39 | 18.20 |
67 | 36.52 | 18.26 |
68 | 36.65 | 18.33 |
69 | 36.78 | 18.39 |
70 | 36.90 | 18.45 |
71 | 37.03 | 18.51 |
72 | 37.15 | 18.57 |
73 | 37.27 | 18.63 |
74 | 37.38 | 18.69 |
75 | 37.50 | 18.75 |
76 | 37.62 | 18.81 |
77 | 37.73 | 18.86 |
78 | 37.84 | 18.92 |
79 | 37.95 | 18.98 |
80 | 38.06 | 19.03 |
81 | 38.17 | 19.08 |
82 | 38.28 | 19.14 |
83 | 38.38 | 19.19 |
84 | 38.49 | 19.24 |
85 | 38.59 | 19.29 |
86 | 38.69 | 19.34 |
87 | 38.79 | 19.40 |
88 | 38.89 | 19.44 |
89 | 38.99 | 19.49 |
90 | 39.08 | 19.54 |
91 | 39.18 | 19.59 |
92 | 39.28 | 19.64 |
93 | 39.37 | 19.68 |
94 | 39.46 | 19.73 |
95 | 39.55 | 19.78 |
96 | 39.65 | 19.82 |
97 | 39.74 | 19.87 |
98 | 39.82 | 19.91 |
99 | 39.91 | 19.96 |
100 | 40.00 | 20.00 |
200 | 46.02 | 23.01 |
300 | 49.54 | 24.77 |
400 | 52.04 | 26.02 |
500 | 53.98 | 26.99 |
600 | 55.56 | 27.78 |
700 | 56.90 | 28.45 |
800 | 58.06 | 29.03 |
900 | 59.08 | 29.54 |
1000 | 60.00 | 30.00 |