v1(t)v0(t)v2(t)延时t0低通滤波器vav若调制信号为一单音余弦信号 v1?Vcos(?ct?mfsin?t)
v2?Vcos[?c(t?t0)?mfsin?(t?t0)]若
?t0较小，
2sin?t0??t0，
cos?t0?1
v2?Vcos[?ct?mfsin?t??ct0?mf?t0cosn?t]v0?KmVcos(?ct?mfsin?t)cos[?c(t?t0)?mfsin?(t?t0)]?121KmVcos(?ct0?mf?t0cos?t)?212KmVcos(2?ct?2mfsin?t?cos?ct0?mf?t0cos?t)2vav??212KmVcos(?ct0?mf?t0cos?t)KmV[cos?ct0cos(mf?t0cost)?sin?ct0sin(mf?t0cost)]22设
?ct0??12?22
mf?cost0?0.2
vav?KmVmf?t0cost