Re: [OT] How to produce IIR filter coefficients from a setofpoints describing the frequency response

> Octave seems to have it:
> https://prof.hti.bfh.ch/sha1/Octave/index/f/invfreqz.html
> ----- Original Message -----
> From: "Andres Cabrera" <mantaraya36@...>
> To: "Developer discussions" <csound-devel@...>
> Sent: Saturday, May 16, 2009 3:12 AM
> Subject: Re: [Cs-dev] [OT] How to produce IIR filter coefficients from a
> setofpoints describing the frequency response
>
>
> The matlab function I'm looking for is acually called invfreqz, not
> invresz which is there in scipy.
>
> Cheers,
> Andrés
>
> On Fri, May 15, 2009 at 9:08 PM, Andres Cabrera <mantaraya36@...>
> wrote:
>> Thanks for the ideas. I've been playing with sage all afternoon and
>> it's great. I'd heard about it, but had not dared install it...
>> But on the topic of iir filter coeficients, I haven't been able to
>> find how... with scipy.signal, there are two functions for creating
>> filters: iirfiter and iirdesign, but they are not designed for
>> arbitrary filter responses, since they model classic bp, hp, lp and br
>> filters. I've found remez, but it's for fir filters.
>> Am I missing something?
>>
>> Cheers,
>> Andrés
>>
>>
>> On Fri, May 15, 2009 at 5:14 PM, Jim Bates <jabates@...> wrote:
>>> From: victor <Victor.Lazzarini@...>
>>> This absolutely impressive, but scary!
>>>
>>> True. Running on OSX 10.4, 1.67 Ghz and 2 GB RAM, Sage will compute pi
>>> to 100,000 places in just under 9 seconds. It uses Cython which is a C
>>> extension
>>> for Python. It is quite fast. ( http://cython.org/ )
>>> All the Best,
>>> Jim
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>>
>>
>>
>> --
>>
>>
>> Andrés
>>
>
>
>
> --
>
>
> Andrés
>
> ------------------------------------------------------------------------------
> Crystal Reports - New Free Runtime and 30 Day Trial
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> ------------------------------------------------------------------------------
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