1．　　利用傅立叶级数展开的方法，自由生成所需的x(t)；

2．　　通过选择不同的采样间隔T（分别选T>或<1/2fc），从x(t)获得相应的x(n)（作出x(n)图形）；

3．　　对获得的不同x(n)分别作傅立叶变换，分析其频率响应特性（给出幅频与相频特性曲线）；

4．　　利用巴特沃思、切比雪夫或椭圆滤波器设计数字滤波器（滤波特性自定），要求通过改变滤波器参数或特性（低通、高通、带通或带阻）设计至少两种数字滤波器，分析所设计滤波器（画出频率特性曲线），并对上述给出的不同x(n)分别进行滤波（画出滤波结果），然后加以讨论；

5．　　利用窗函数设计法或频率采样法设计数字滤波器（滤波特性自定），要求通过改变滤波器参数或特性（低通、高通、带通或带阻等）设计至少两种数字滤波器，分析所设计滤波器（画出频率特性曲线），并对上述给出的不同x(n)分别进行滤波（画出滤波结果），然后加以讨论。

-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