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Re: Plotting the frequency response of a filter in "real" Hz


From: Juan Pablo Carbajal
Subject: Re: Plotting the frequency response of a filter in "real" Hz
Date: Thu, 21 Apr 2016 17:13:07 +0200

On Thu, Apr 21, 2016 at 2:44 AM, Guilherme Ritter
<address@hidden> wrote:
> Hi everyone.
>
> I've just started in filter design at college and I'm learning to use Octave
> for it. I want to see the frequency response of filters I design. I've
> managed to find code on the internet, but the output's x axis is in radian
> frequency. I'd like it to show "actual" Hz. For example, if the cutoff
> frequency is 5,5 kHz, I'd like for it to be represented in the plot's x axis
> at 5500 or 5,5.
>
> I've searched a lot but couldn't find anything, only some solutions that
> work in MatLab but not in Octave. At college, I'm using Octave 4.0.0,
> packages control 3.0.0 and signal 1.3.2, Windows 7 Enterprise x64. At home,
> all the versions are up to date, Xubuntu 14.04 x64.
>
> I've found the code here:
> https://ccrma.stanford.edu/~jos/fp/Example_LPF_Frequency_Response.html
>
> Can I use Octave's functions to get that plot the way I want it?
>
> Thanks in advance.
>
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>

See if the commands in this function help you
https://bitbucket.org/KaKiLa/mymfiles/src/3a73789375fdb3425140633b56146b894ce66b13/normFFT.m?fileviewer=file-view-default



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