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)
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)
举一反三
- 低频调制信号uΩ(t)=UΩmcos(Ωt),载波信号uc(t)=Ucmcos(ωct),下列式中为调相信号的是
- 若载波uc(t)=Ucmcosωct,调制信号uΩ(t)= UΩmcosΩt,则调相波的表达式为 A: uFM(t)=Ucmcos(ωct+mpcosΩt) B: uFM(t)=Ucmcos(ωct+mfsinΩt) C: uFM(t)=Ucm(1+mpcosΩt)cosωct D: uFM(t)=kUΩmUcmcosωctcosΩt
- 已知载波uc=Ucmcosωct,调制信号uΩ=UΩsinΩt,则FM波的表达式为() A: uFM(t)=Ucmcos(ωct+mfsinΩt) B: uFM(t)=Ucmcos(ωct-ufsinΩt) C: uFM(t)=Ucmcos(ωct+mfcosΩt) D: uFM(t)=Ucmcos(ωct-mfcosΩt)
- 若载波uC(t)=UCcosωCt,调制信号uΩ(t)=UΩcosΩt,则调相波的表达式为() A: u(t)=Ucos(ωt+msinΩt) B: u(t)=Ucos(ωt+mcosΩt) C: u(t)=U(1+mcosΩt)cosωt D: u(t)=kUUcosωtcosΩt
- 若载波uc=Uccosωct,调制信号uΩ=UΩcosΩt,则双边带调幅波的表达式为() A: uDSB(t)=Uccos(ωct+msinΩt) B: uDSB(t)=Uccos(ωct+mcosΩt) C: uDSB(t)=kUΩUccosωctcosΩt D: uDSB(t)=Uc(1+mcosΩt)cosωct