See Periodic Convolution_Old Kiwi

Formula for Aperiodic Convolution

$ \begin{align}y[n] &= h[n]*x[n]\\&= \sum_{m=-\infty}^{\infty}h[n-m]x[m]\\\end{align} $

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Sees the importance of signal filtering in medical imaging

Dhruv Lamba, BSEE2010