A Design Approach to Linear‐Phase FIR Filters with Odd‐Symmetric Transition Bands Using Piecewise Exponential Functions
Hiroto Saito · Electronics and Communications in Japan · 2016
SUMMARY This paper proposes a novel method for designing linear‐phase finite‐impulse response digital filters with an asymmetric transition band. The proposed filters use a form of piecewise exponential functions in the frequency domain where transition characteristics are determined by giving only two fixed feature points. The design method was evaluated in two ways. First, we evaluated a designed asymmetric transition band filter, and the results revealed that evaluated errors in the proposed filters were equivalent to well‐known existing filters. Then, it was shown that a three‐channel filter bank with an asymmetric transition band and linear‐phase property could be implemented.