Uniform filter bank containing N‐path digital filter

This paper presents a construction method of a uniform filter bank using an N‐ path digital network. This filter bank is constructed by connecting an N‐path digital network to DFT polyphase filter banks. First, the input signal is divided into two parts by an N‐path digital network and its complement. These resulting output signals are separately band‐split and synthesized by DFT polyphase filter banks. Hence, its design method becomes very simple and both the required order and the number of multi plications can be reduced. Also, there quired structure is not so complicated. Further, a design method of the low‐ pass digital filter using this digital filter bank is presented. the low‐pass filter with cutoff near π/2 which cannot be obtained easily in the usual multirate digital filter, can be realized by using these filter banks.