Convolution with numpy

A convolution is a way to combine two sequences, x and w, to get a third sequence, y, that is a filtered version of x. The convolution of the sample xt is computed as follows: It is the mean of the weighted summation over a window of length k and wt are the weights. Usually, the sequence w is generated using a window function. Numpy has a number of window functions already implemented: bartlett, b