后面的FIR 滤波器的设计中，为获得有限长单位取样响应，需要用窗函数截断无限长单位取样响应序列。
The back of the FIR filters design, to acquire limited long unit sampling response, need to use the window function truncation infinite long unit sampling response sequence.
用于各种织物的圆形取样，供测定织物单位面积质量。
Used for sampling the roundness sample of all kinds of fabric to test whose weight of unit area.
用于各种织物的圆形取样，以测定单位面积的质量。
Used for sampling the roundness sample of all kinds of fabric to test whose weight of unit area.
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