%0 Journal Article %T Spaces of Test Functions via the STFT %A Karlheinz Gr chenig %A Georg Zimmermann %J Journal of Function Spaces and Applications %D 2004 %I Hindawi Publishing Corporation %R 10.1155/2004/498627 %X We characterize several classes of test functions, among them Björck's ultra-rapidly decaying test functions and the Gelfand-Shilov spaces of type S, in terms of the decay of their short-time Fourier transform and in terms of their Gabor coefficients. %U http://www.hindawi.com/journals/jfsa/2004/498627/abs/