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m ( t ) m(t) m(t)
S ( t ) = A ( t ) c o s [ ω c t + ϕ 0 ] S(t)=A(t)cos[\omega_ct+\phi_0] S(t)=A(t)cos[ωct+ϕ0]
S m ( t ) = A c o s [ ω c t + ϕ ( t ) ] S_m(t)=Acos[\omega_ct+\phi(t)] Sm(t)=Acos[ωct+ϕ(t)]
S F M ( t ) = A c o s [ ω c t + K f ∫ m ( τ ) d τ ] S_{FM}(t)=Acos[\omega_ct+K_f\int {m(\tau)d\tau}] SFM(t)<
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