Matlab 自定义窗函数的幅频分析，包括矩形窗，三角窗，汉宁窗，汉明窗等-Matlab customize the width of the window function frequency analysis, including rectangular windows, triangular windows, Hanning window, Hamming window, etc.

To construct all type of filters for the category of hamming, hanning e.t.c.

利用理想单位脉冲响应,低通、高通滤波频率在单位脉冲响应下，通过汉宁窗计算理想的截止频带滤波单位脉冲响应-To compute the ideal bandstop filter unit pulse respondence,ideal unit pulse respondence, low/high cutoff frequency, and unit pulse respondence are used in consideration of Hanning windows