Translations:Symmetric wavelets/8/en

The rectangular wavelet is useful for theoretical purposes; however, it is unsuitable for many practical problems because of the strong side lobes in its frequency spectrum. The rectangular wavelet, which is symmetric, is nonzero phase. The side lobes make the effective bandwidth of the rectangular wavelet very wide. To be suitable for most practical purposes, a wavelet should have the narrowest possible frequency spectrum commensurate with the need for the wavelet to have adequate time resolution.