[SciPy-User] SciPy and MATLAB give different results for 'buttord' function (Re: SciPy-User Digest, Vol 137, Issue 17)

[Renan Birck Pinheiro]

2015-01-20 16:00 GMT-02:00 <scipy-user-request at scipy.org>:

> Message: 1
> Date: Mon, 19 Jan 2015 18:54:52 -0700
> From: KURT PETERS <peterskurt at msn.com>
> Subject: Re: [SciPy-User]
> ​​
> SciPy and MATLAB give different results for
>         'buttord' function (Renan Birck Pinheiro)
> To: "scipy-user at scipy.org" <scipy-user at scipy.org>
> Message-ID: <BLU172-W5224ECC196864DDA0474CDD84B0 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> I think Wp and Ws are supposed to be between 0 and 1.
>


​If it was a digital filter, indeed Wp and Ws would need to be between 0
and 1.
But this is an analog filter, and in the SciPy documentation it says: "For
analog filters, wp and ws are angular frequencies (e.g. rad/s).".​

​Thanks,

​Renan​

-- 
Renan Birck Pinheiro - Chip Inside Tecnologia <http://www.chipinside.com.br>
Acad. Engenharia Elétrica <http://www.ufsm.br/cee> - UFSM
<http://www.ufsm.br> - Santa Maria, Brasil
http://renanbirck.blogspot.com - +55 55 91162798 / +55 55 99034839

*Talk is cheap, show me the code*. - Linus Torvalds
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