M
M
M
M, E(M) = E1(M) + E2(M),Ei(M)i
M
MΣ
Σ
Σ
M
s1(M, t) = A1(M) cos(ω1tφ1)s2(M, t) = A2(M) cos(ω2tφ2)
M
ω1=ω2=ω
φ(M)
S M
|τ2τ1| ≪ τc
M
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