14.반송파 vc(t) = Vc cos ωct, 신호파 vs(t) = Vs cosωst라 할 때, FM 피변조파 vm(t)를 표시한 것은?

1

vm(t) = Vc(1+mf cos ωst) cos ωct

2

vm(t) = Vc cos(ωct+mf sin ωst)정답

3

v m (t) = V c cos(ω c t+ v s (t))

4

v m (t) = V c cos(ω c t+ V s cos ω s t)