# Translations:Spiking filter/25/en

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As the second example, suppose that we let the input be the corresponding maximum-phase wavelet *b* = (1, 2) and the desired output be the same spike. In other words, we seek to find the two-length filter that will convert the input wavelet (1, 2) into the same unit spike *d* = (1, 0, 0). We note that the maximum-phase input wavelet *b* = (1, 2) has the same autocorrelation as does the minimum-phase input wavelet *b* = (2, 1) that we used in the first example. The normal equations now are