The aim of this work is to present several topics in time-frequency analysis as subjects in abelian group theory. The algebraic point of view pre- dominates as questions of convergence are not considered. Our approach emphasizes the unifying role played by group structures on the development of theory and algorithms. This book consists of two main parts. The first treats Weyl-Heisenberg representations over finite abelian groups and the second deals with mul- tirate filter structures over free abelian groups of finite rank. In both, the methods are dimensionless and coordinate-free and apply...