傅里叶变换窗函数
原理
用窗函数分析信号，相当于将一个待分析信号x1通过一个传输函数为窗函数傅里叶变换的滤波器得到输出信号或分析信号y1
http://www.cnblogs.com/gaozehua/p/3516556.html
http://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/s2010/gjm76_asr96/gjm76_asr96/
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