# Translations:Nonminimum-delay wavelet/13/en

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We now want to consider the *inverse problem*: Given the energy spectrum (or, equivalently, the autocorrelation), we want to find the wavelet that yields this energy spectrum. This inverse problem, as it stands, is not unique in that many wavelets have the given amplitude spectrum Only one of these wavelets is minimum delay. This exceptional wavelet can be determined because it is possible to determine the minimum-phase spectrum from knowledge of its amplitude spectrum . Thus, we have enough information to compute the minimum-delay counterpart of the nonminimum-delay signature. This is how we do it: