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+* Implement more wavelet types:
+ Check the literature to find out what are commonly used types. Candidates
+ could be coiflets and symmlets.
+** Coefficients for coiflets and symmlets found so far are only with a
+ precision of about eight digts. This is probaly insufficient.
+
+* Wavelet packet transform:
+ Should include utility functions for selecting the coefficients according
+ to "dwt-type", "best basis" or "best level".
+
+* Continuous wavelet transform.