レベル表現
例えば ( A 0 , A 1 , A 2 ) = ( 1 , 10 , 1000 ) {\displaystyle (A_{0},A_{1},A_{2})=(1,10,1000)} のとき ( L 1 , L 2 ) = ( 10 dB × lg  10 1 , 10 dB × lg  10 3 ) = ( 10 dB , 30 dB ) {\displaystyle (L_{1},L_{2})=(10\ {\text{dB}}\times \lg 10^{1},10\ {\text{dB}}\times \lg 10^{3})=(10\ {\text{dB}},30\ {\text{dB}})} で差は20dBであり、 A 0 = 10 {\displaystyle A_{0}=10} に変更しても ( L 1 , L 2 ) = ( 10 dB × lg  1 , 10 dB × lg  10 2 ) = ( 0 dB , 20 dB ) {\displaystyle (L_{1},L_{2})=(10\ {\text{dB}}\times \lg 1,10\ {\text{dB}}\times \lg 10^{2})=(0\ {\text{dB}},20\ {\text{dB}})} となり差は20dBで変化しない。