Design a third order low pass butterworth filter

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Group 1 2016-12-20

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https://ww2.mathworks.cn/matlabcentral/answers/317630-design-a-third-order-low-pass-butterworth-filter

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 2016-12-22

Can i compute it without sampling frequency? all the examples mention it. but its not given in the question

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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回答（1 个）

David Barry 2016-12-20

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https://ww2.mathworks.cn/matlabcentral/answers/317630-design-a-third-order-low-pass-butterworth-filter#answer_247996

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