Extract a Bode Plot from a filter

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Karl Rueth
Karl Rueth 2018-5-28
评论： Karl Rueth 2018-5-28
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
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
Karl Rueth 2018-5-28
Yes it was, Freqs has to be used for analogue filters .. Thanks to Star Rider

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Star Strider
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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