Extract a Bode Plot from a filter
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I have this low pass filter and need to extract the bode plot of it.
[b,a]=butter(3,50/1000,'low');
freqz function isn't working, possibly because it's not a digital filter. Could someone guide me on how I can do it.
2 个评论
Geoff Hayes
2018-5-28
Karl - please clarify what you mean by freqz function isn't working. Are there errors or something else?
Karl Rueth
2018-5-28
采纳的回答
Star Strider
2018-5-28
Use the Signal Processing Toolbox freqs (link) function for continuous filters, or freqz (linked to at the end of that documentation) for discrete filters. You can also get the amplitude and frequency outputs.
[b,a]=butter(3,50/1000,'low');
figure
freqs(b, a)
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