http://demonstrations.wolfram.com/ConvolutionSum/
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The n^th component of the convolution of h and x is defined by yn = sumk = - inftyinftyhk xn - k. Note that x - k is the sequence xk written in reverse order, and xn - k shifts this sequence n units right for positive n. Thus one can thin...
Contributed by: Bruce Atwood (Beloit College)
Suggested by: Patrick Van Fleet (University of St. Thomas)
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