(2) Moving-Average Filter (3) Linear Interpolator (4) Median Filter 由 Lowpass, Highpass, Bandpass and Bandstop的 Frequency response推导其 Transfer Function,时域表达式（2） Moving-Average Filter （3） Linear Interpolator （4） Median Filter 20、 由 Lowpass, Highpass, Bandpass and Bandstop 的 Frequency response 推导其 Transfer Function, 时域表达式