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，分析所设计滤波器并对上述给出的不同x(n)分别进行滤波；

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，分析所设计滤波器并对上述给出的不同x(n)分别进行滤。。

-1. Using Fourier series expansion, free to generate the required x (t)　

2. By selecting a different sampling interval T (respectively, selected T> or <1/2fc), from x (t) to obtain the corresponding x (n) (to x (n) graphics)　

3. For access to different x (n), respectively, for the Fourier transform to analyze the frequency response 4. Use of Butterworth, Chebyshev or elliptic filter design for digital filter (customize filter characteristics), requested by changing the filter parameters or characteristics (low pass, high pass, band pass or band-stop) at least two digital filter design, filter design and analysis given above of different x (n) filtering, respectively　

5. Using the window function design method or the frequency sampling method to design digital filter (filter features custom), requested by changing the filter parameters or characteristics (low pass, high pass, band pass or band-stop, etc.) at least two digital filter design device, designed to filter and analy