Question

Use MATLAB please find the passband and stopband of (digital an analouge) butterworth filter: number of...

Use MATLAB please

find the passband and stopband of (digital an analouge) butterworth filter:

number of order: 4

fc= 0.35

type=lowpass

fs=10Hz

Engineering   Electrical-Engineering   
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Homework Answers

Answer #1

code:

fil = designfilt('lowpassiir', 'FilterOrder', 4, 'HalfPowerFrequency',0.5, 'SampleRate', 10, 'DesignMethod', 'butter');
fvtool(fil);

In this instead of 0.35 cuttoff frequency the half power frequency that is frequency at 3db level is used because of IIR filter approximation, if we use FIR then 6db level is used which is 0.35 but here we are using iir so according to matlab operation and methods it accepts the half power frequency for butter iir filter.


In this the red line box shown is passband and the bottam one is stop band.

Close view of passband

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