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DESIGN OF FIR AND IIR FILTERS

Publication Date : 26/12/2015



Author(s) :

Ankit Saxena , Nidhi Sharma.


Volume/Issue :
Volume 2
,
Issue 12
(12 - 2015)



Abstract :

This paper based on the design of digital filter. Digital filters are basically of two types- FIR filter and IIR filter, digital IIR filter with fixed point representation is to be designed. Firstly digital low pass IIR filter is to be designed. Digital Filters are designed by using the values of both the past outputs and the present input, an operation brought about by convolution. If such a filter is subjected to an impulse then its output need not necessarily become zero. The impulse response of such a filter can be infinite in duration. Such a filter is called an Infinite Impulse Response filter or IIR filter. The infinite impulse response of such a filter implies the ability of the filter to have an infinite impulse response. This indicates that the system is prone to feedback and instability. In this paper, the design of IIR filters was considered. Several results from theory were verified in the design. The characteristics of a number of important approximations – Butterworth and Kaiser Window Filters were affirmed from the results obtained. The design of the low-pass filter was particularly insightful in comparing the relative merits and demerits of FIR and IIR filters in general as well as the individual IIR filter approximations. 


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DESIGN OF FIR AND IIR FILTERS

December 23, 2015