–针对矩形、bartlett、hanning、hamming、blackman窗

M=40

–求：

①分别画出单位脉冲响应w[n]

②分别画出幅度响应20log10|W(e^jω)|

③分别给出第一旁瓣衰减和主瓣带宽，并与理论值比较-- For a rectangle, bartlett, hanning, hamming, blackman window M = 40- seeking: ① Draw the unit impulse response w [n] ② Draw the amplitude response 20log10 | W (e ^ jω) | ③ were given first sidelobe attenuation and bandwidth of the main lobe, and compared with the theoretical value