Assume that Z(t) = X(t) + Y(t), where X(t) and Y(t) are jointly stationaryrandom processes,then Sz(f) = Sx(f) + Sy(f)
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1.Assume that Z(t) = X(t) + Y(t), where X(t) and Y(t) are jointly stationaryrandom processes,then Sz(f)
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2.C.f(t)*(t)=f(t)D.f(t)*(t)=f(t)
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3.8.下列等式不成立的是A(T-t)*2(t to)=f()*f().[(*)dtf2(t)A、f(t)*8(t)=f(n)B、f()*(t)=f(t
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4.函数A、y = u n , u =cos x nB、y = t , t =cos n xC、y = t n , t =cos xD、y =cos t , t = x n
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5.(4)f(t)=1 t
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6.5.已知信号f(t)的傅里叶变换F(ja)=u(x ay)-u(-),则f(t)为A Se(C 2u Sa(as t)D Za Sa
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7.65 f()*tu()=tu(),f(t)
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8.(3) f(x, y,z)= ry y = l,x y z= 0.
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9.(2)y' cos x=esim t
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10.G71 P(ns) Q(nf) U(Δu) W(Δw) F(f) S(s) T(t)中F、S、T在循环时无效?