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谱分析MATLAB实验课

于 2022-03-19 发布 文件大小:65.17 kB
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应用背景   信号是无限长的,而在进行信号处理时只能采用有限长信号,所以需要将信号“截断”。在信号处理中,“截断”被看成是用一个有限长的“窗口”看无限长的信号,或者从分析的角度是无限长的信号x(t)乘以有限长的窗函数w(t),由傅里叶变换性质可知    如果x(t)是频宽有限信号,而w(t)是频宽无限函数,截断后的信号也必是频宽无限信号,从而产生所谓的频谱泄露。 关键技术 用MATLAB编程绘制各种窗函数的形状  2、用MATLAB编程绘制各种窗函数的幅度响应  3、绘制矩形窗的幅频响应,窗长度分别为:N=10,N=20,N=50,N=100  4、已知周期信号x(t)=0.75+3.4cos2πft+2.7cos4πft+1.5sin3.5πft+2.5sin7πft,其中f=Hz,若截断时间长度分别为信号周期的0.9和1.1倍,试绘制和比较采用下面窗函数提取的x(

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