理想低通濾波器的頻率響應(yīng)為.
如果輸入信號(hào)為x(t)=10cos(100πt)+5cos(200πt),則輸出信號(hào)為y(t)=()
A.100cos(10πt) B.200cos(10πt) C.100cos(20πt) D.200cos(5πt)
A. B. C. D.
A.F(jω)=sa(ω0t) B.F(jω)=2π C.1 D.