1 dB = 10 x log10( ) (log10 = 10)

dB, = 10 ^ (db/10)

: - - = 1, 10 x log10(1) = 10 x 0 = 0 dB 50% , = 0,5 10 x log10(0,5) = 10 x (-0,3) = -3 dB ( 3 dB = 50% ) ( - = ) 10% , = 0,1 10 x log10(0,1) = 10 x (-1) = -10 dB ( 10 dB = 90% ) 1% , = 0,01 10 x log10(0,01) = 10 x (-2) = -20 dB ( 20 dB = 99% ) 1 , = 0,001 10 x log10(0,001) = 10 x (-3) = -30 dB ( 30 dB = 99,9% )