Lab 4 - FIR/IIR Filtering System Design

Abstract

This chapter focuses on finite impulse response (FIR) and an infinite impulse response (IIR) filter, which are designed using the virtual instruments (Vis) as a part of the digital filter design (DFD) toolkit. A lowpass FIR filter is generally designed by providing the appropriate specifications as per requirement by using a DFD toolkit. The specifications of the filter are mentioned in the configuration dialog box. Additional information on the designed filter, such as phase, group delay, impulse response, unit response, frequency response, and zero or pole plot can be known by using the DFD filter analysis express virtual instrument (VI). Creating a filtering system VI consists of signal generation, filtering, and graphical output components. Three sinusoidal signals are summed and passed through the designed FIR filter and the resulting filtered signal is then displayed and verified. In an IIR filter, specifications are provided as per requirement and the design of an IIR filter is achieved by using the DFD classical filter design express VI. Various tools are used to compute coefficient sets of digital filters based on their specifications; these are explained in the chapter.