Abstract
Needless to say, the digital filter is an important technology in signal processing. Research on digital filters has a long history and many methods have been proposed to obtain “good” digital filters that have high performance. Although many research activities on digital filters are still being conducted from a variety of aspects, it seems that few research results are in sufficiently widespread use in today’s practical applications. One of the reasons for this problem lies in the lack of understanding of “What is a “good” digital filter?” and “What should we do to obtain a “good”digital filter?” because the research field of digital filters has become diverse and complicated. Motivated by this observation, in this work, we start with the clarification of these questions from the viewpoints of design, realization, and implementation. Then we introduce the state-of-the-art research activities on “good” digital filters, focusing on the papers presented at the special symposium session of the 2014 IEICE Society Conference. Furthermore, we discuss an important future task—what we should do to bring “good” digital filters into widespread use.
