Linear Systems rt st 1 Linear Systems Superposition

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전자통신연구실 Linear Systems r(t) s(t) 1

전자통신연구실 Linear Systems r(t) s(t) 1

전자통신연구실 Linear Systems Superposition Linearity Time-invariant 2

전자통신연구실 Linear Systems Superposition Linearity Time-invariant 2

전자통신연구실 Transfer function Impulse response h(t) Transfer function (System function) 3

전자통신연구실 Transfer function Impulse response h(t) Transfer function (System function) 3

전자통신연구실 복소 전달함수 Complex transfer function 4

전자통신연구실 복소 전달함수 Complex transfer function 4

전자통신연구실 Filter Phase[H(f)] |H(f)| A slope = f f 9

전자통신연구실 Filter Phase[H(f)] |H(f)| A slope = f f 9

전자통신연구실 Low-pass Filter |H(f)| Phase[H(f)] A f f 10

전자통신연구실 Low-pass Filter |H(f)| Phase[H(f)] A f f 10

전자통신연구실 Band-pass Filter |H(f)| Phase[H(f)] A f f 11

전자통신연구실 Band-pass Filter |H(f)| Phase[H(f)] A f f 11

전자통신연구실 LPF vs. BPF let 12

전자통신연구실 LPF vs. BPF let 12

전자통신연구실 Causality (인과율) A causal system is one which the output for t =

전자통신연구실 Causality (인과율) A causal system is one which the output for t = to depends on the input for only. A system is causal if for any two input and that are equal for , the corresponding output and are also equal for. In the LTI systems, this is equivalent to the condition that h(t) = 0, t < 0. 14

전자통신연구실 Causality (인과율) In the LTI systems, this is equivalent to the condition that

전자통신연구실 Causality (인과율) In the LTI systems, this is equivalent to the condition that h(t) = 0, t < 0. If h(t) = 0 for t < 0, 15

전자통신연구실 RC Low-pass Filter R + + C _ _ 16

전자통신연구실 RC Low-pass Filter R + + C _ _ 16

전자통신연구실 RC Low-pass Filter 3 d. B cutoff frequency ideal LPF 17

전자통신연구실 RC Low-pass Filter 3 d. B cutoff frequency ideal LPF 17

전자통신연구실 Butterworth Filter 18

전자통신연구실 Butterworth Filter 18

전자통신연구실 RLC bandpass Filter 19

전자통신연구실 RLC bandpass Filter 19

전자통신연구실 전력과 에너지 energy spectral density autocorrelation function 23

전자통신연구실 전력과 에너지 energy spectral density autocorrelation function 23