Decibels

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dB level Power   dB level Amplitude
–30 dB 1/1000 = 0.001   –30 dB = 0.03162
–20 dB 1/100 = 0.01   –20 dB = 0.1
–10 dB 1/10 = 0.1   –10 dB = 0.3162
–3 dB ca. 1/2 = 0.5   –3 dB = 0.7071
3 dB ca. 2   3 dB = 1.414
10 dB 10   10 dB = 3.162
20 dB 100   20 dB = 10
30 dB 1000   30 dB = 31.62