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)
A: uFM(t)=Ucmcos(ωct+mfsinΩt)
B: uFM(t)=Ucmcos(ωct-ufsinΩt)
C: uFM(t)=Ucmcos(ωct+mfcosΩt)
D: uFM(t)=Ucmcos(ωct-mfcosΩt)
D
举一反三
- 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
- 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)
- 若载波uC(t)=UCmcosωCt,调制信号uΩ(t)= UΩmcosΩt,则双边带调幅波的表达式为(
- 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)=UCcosωCt,调制信号uΩ(t)=UΩcosΩt,则调相波的表达式为(). A: uPM(t)=UCcos(ωCt+mfsinΩt) B: uPM(t)=UCcos(ωCt+mpcosΩt) C: uPM(t)=UC(1+mpcosΩt)cosωCt D: uPM(t)=kUΩUCcosωCtcosΩt
内容
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若载波uC(t)=UCcosωCt,调制信号uΩ(t)=UΩcosΩt,则调相波的表达式为(). A: uPM(t)=UCcos(ωCt+mfsinΩt) B: uPM(t)=UCcos(ωCt+mpcosΩt) C: uPM(t)=UC(1+mpcosΩt)cosωCt D: uPM(t)=kUΩUCcosωCtcosΩt
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5.若载波uC(t)=UCcosωCt,调制信号uΩ(t)= UΩcosΩt,则调相波的表达式为 ( ) A: A.uPM(t)=UCcos(ωCt+mfsinΩt) B: B.uPM(t)=UCcos(ωCt+mpcosΩt) C: C.uPM(t)=UC(1+mpcosΩt)cosωCt D: D.uPM(t)=kUΩUCcosωCtcosΩt
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若载波uC(t)=UCcosωCt,调制信号uΩ(t)=UΩcosΩt,则调频波的表达式为
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8.若载波uC(t)=UCcosωCt,调制信号uΩ(t)= UΩcosΩt,则普通调幅波的表达式为( ) A: A.uAM(t)=UCcos(ωCt+masinΩt) B: B.uAM(t)=UCcos(ωCt+macosΩt) C: C.uAM(t)=UC(1+macosΩt)cosωCt D: D.uAM(t)=kUΩUCcosωCtcosΩt
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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