短語詞組短語polynomial frequency modulation signal 多項式調(diào)頻信號frequency modulation signal 調(diào)頻信號keying frequency modulation signal 鍵控調(diào)頻信號linear frequency modulation signal 線性調(diào)頻信號tg frequency modulation signal 正切調(diào)頻信號nonlinear frequency modulation signal 非線性調(diào)頻信號noise frequency modulation signal 噪聲調(diào)頻信號linearity frequency modulation signal 線性調(diào)頻信號 返回 modulation signal frequency