FPGA Implementation of Variable Digital Filter using MicroBlaze Processor

Abstract

Digital filters have found numerous applications in most digital signal processing systems. Conventional digital filter can only obtain fixed frequency domain characteristics at a time. In order to obtain variable
characteristics, the digital filter’s type, number of taps and coefficients should be changed constantly such that the desired frequency-domain characteristics can be obtained. Unlike conventional digital filter, Variable Digital Filters (VDFs) can change their filter-type, number of taps and coefficients constantly such that the desired frequencydomain characteristics can be obtained. This paper proposes a method for Variable Digital Filter (VDF) design based on Field Programmable Gate Array and Embedded Micro-Processor (EMP). This VDF is best suited for realization of digital filter algorithms, which are low-pass, high-pass, band-pass and band-stop filter algorithms with variable frequency domain characteristics. The design has been prototyped on an XUPV5-LX110T Evaluation Platform using Integrated Synthesis Environment (ISE) 12.4 Tools all in one design suit from Xilinx.