• 2022-06-15
    低频调制信号为uΩ(t)=UΩmcos(Ωt),载波信号为uc(t)=Ucmcos(ωct),下列表达式中为调相信号的是()。
    A: u(t)=Ucm(1+mcosΩt)cos(ωct)
    B: u(t)=UΩmcosΩt+Ucmcos(ωct)
    C: u(t)=Ucmcos(ωct+mcosΩt)
    D: u(t)=Ucmcos(ωct+msinΩt)