连续卷积与有限长序列的卷积和在文献中给出了多种解法。
Numerical Deconvolution Method for Continuous Signals Processing and Its Application;
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.
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