[电] pulse-duration modulation-frequency modulation

mài chōng qī jiān tiáo zhì pín lù: tiáo zhì ㄇㄞˋ ㄔㄨㄥ ㄑㄧ ㄐㄧㄢ ㄊㄧㄠˊ ㄓˋ ㄆㄧㄣˊ lu:4 ㄊㄧㄠˊ ㄓˋ