Lab 3 Report (1).docx - NAME:NEKKANTI VENKATA SAI KIRAN...

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NAME:NEKKANTI VENKATA SAI KIRAN ID.NO:150040603 SEC:08 LAB-3 DESIGN AND IMPLEMENTATION OF DIGITAL IIR FILTERS Aim : To develop matlab codes for finding the order of Butterworth and Chebyshev filters, to design a high pass Butterworth filter, to plot it’s magnitude and phase responses with given parameters and to design a low pass FIR filter. Software Required : MATLAB Theory : IIR filters are digital filters with infinite impulse response. Unlike FIR filters, they have the feedback (a recursive part of a filter) and are known as recursive digital filters therefore. For this reason IIR filters have much better frequency response than FIR filters of the same order. Unlike FIR filters, their phase characteristic is not linear which can cause a problem to the systems which need phase linearity. For this reason, it is not preferable to use IIR filters in digital signal processing when the phase is of the essence. Otherwise, when the linear phase characteristic is not important, the use of IIR filters is an excellent solution. There is one problem known as a potential instability that is typical of IIR filters only. FIR filters do not have such a problem as they do not have the feedback. For this reason, it is always necessary to check after the design process whether the resulting IIR filter is stable or not.
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