How to Determine the impluse response and provided a plot of the frequency response of the designed filter. by using Matlab software

* Design a lowpass digital filter (IIR) using a Butterworth prototype to satisfy:
Wp=0.2π, Ws=0.3π, Rp=1dB, As=15dB
Wp= digital passband freq
Ws= digital stopband freq
Rp= passband ripple
As= stopband attenuation

How to solve this question by using Matlab.

[Jan]

I've deleted the duplicate post. Please post a question once only.

[Yash]

is that a question? check out the help you can find the butterworth filter very easily and the demos are awesome, will help you alot, that enuf for this

[Lee]

yes, this is the example question.

[Walter Roberson]

Please see http://www.mathworks.com/matlabcentral/answers/43073#answer_52939

Answer 1

[Honglei Chen]

I would suggest you to read the documentation for several functions. Simply type these commands in your command window

doc buttord
doc butter
doc freqz