A.Fourier series expansion method, the freedom to generate the required x (t) Two. Respectively election by selecting different sampling interval T (T> or <1/2fc), the corresponding x (n) from x (t) (make x (n) graphic) 3. The different x (n) the Fourier transform analysis of the frequency response characteristics (given amplitude frequency and phase frequency response curve) 4. Butterworth, cut than the Chebyshev or elliptic filter design digital filter (the filter characteristics from the set), requirements designed to change the filter parameters or characteristics (low pass, high pass, band pass or band-stop) at least two digital filtering to analyze the filter design (draw-frequency characteristic curve), and were given above x (n) filter (Paint filter results), and then to be discussed 5 Window function design method or frequency of sampling design of digital filters (filter characteristics from the set), at least two digital filter design for change the filter para

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