單項(xiàng)選擇題若載波uC(t)=UCcosωCt,調(diào)制信號uΩ(t)=UΩcosΩt,則調(diào)相波的表達(dá)式為().

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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