A.7:1 B.13:1 C.15:1 D.17:1 E.27:1
A.1.3倍 B.2.3倍 C.3.3倍 D.4.3倍 E.5.3倍
A.20~20000Hz B.500~2000Hz C.1000~3000Hz D.125~8000Hz E.8000~18000Hz