Design a third order low pass butterworth filter

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Group 1
Group 1 2016-12-20
评论： Star Strider 2016-12-22
I want to design a 3rd order butterworth filter with a cutoff frequency 160 rad/s. The input signal is a square wave with magnitude of +-1V. and fundemental frequency of 130 rad/s. I must use butter(N,Wn,'s') command. And i have to find the magnitude and phase spectra of the filter.
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Group 1
Group 1 2016-12-22
Can i compute it without sampling frequency? all the examples mention it. but its not given in the question
Star Strider
Star Strider 2016-12-22
You can compute the Fourier transform without the sampling frequency. The results will not provide you with any information with respect to frequency.

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David Barry
David Barry 2016-12-20
Read the doc and follow one of the very similar examples. If you are still stuck after that then upload your code and specific question. https://uk.mathworks.com/help/signal/ref/butter.html
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