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I have designed few shelving and peak filter. And I have calculated the a, b coeficients for several gains for these filters. Now I would like to create some kind of characteristic in Matlab so I could present my design of these filters?

Something like this for shelving filter enter image description here

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  • $\begingroup$ freqz - but really, this is a programming question $\endgroup$ – pichenettes May 13 '14 at 20:21
  • $\begingroup$ i'm just curious, what are your findings? $\endgroup$ – robert bristow-johnson May 14 '14 at 1:35
  • $\begingroup$ I added my characteristics for filters below. $\endgroup$ – zdarsky.peter May 15 '14 at 7:45
  • $\begingroup$ but what did you find? and what do you mean by "characteristics"? $\endgroup$ – robert bristow-johnson May 15 '14 at 15:12
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    $\begingroup$ Yes but no to confirm, but to know if calculated coeficients for filters were right. From these visulations I know that filters work good $\endgroup$ – zdarsky.peter May 16 '14 at 13:35
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I suggest you to use fvtool in MATLAB:

fvtool(b,a)
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Thanks to @jojek I managed to create some characteristics for my filters.

Low shelving filter

Low shelving filter

High shelving filter

High shelving filter

Peak filter - bandwidth

Peak filter - bandwidth

Peak filter - gain

Peak filter - gain

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