辛格函数sinc(x)和抽样函数Sa(t)
https://blog.csdn.net/lab_3D/article/details/104972398?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-104972398-blog-126444507.pc_relevant_recovery_v2&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-104972398-blog-126444507.pc_relevant_recovery_v2&utm_relevant_index=2
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