The purity and resolution are the two important factors of designing the DDFS, which need to be improved as much as possible. In this book different models of the DDFS are created, implemented and examined for different aspects to determine what would work best for an application. This book also focuses on the realization of fast FDM-TDM transmultiplexer algorithm used to construct a bank of digital filters. This book comprises of six chapters in which the last chapter is for major findings and future scope of work for young researchers.