*PN* 95/10 TI eng: Trigonometric Wavelets and the Uncertainty Principle dt: Trigoniometrische Wavelets und das Unsch"arfeprinzip AU Selig, Kathi SO Preprint 95/10, ISSN 0948-1028 LA englisch AB The time-frequency localization of trigonometric wavelets is discussed. A good measure is provided by a periodic version of the Heisenberg uncertainty principle. We consider multiresolution analyses generated by de la Vallee Poussin means of the Dirichlet kernel. For the resulting interpolatory and orthonormal scaling functions and wavelets, the uncertainty product can be bounded from above by a constant. CC 41A10 Approximation by polynomials 42A10 Trigonometric approximation UT periodic wavelets, time-frequency-analysis, uncertainty principle