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I need to design a butterworth approximated low pass, high pass, band
pass, band stop filter characteristics.This i did using DFT technique
which is a very heavy algorithm.So My question is how to design the
FIR for my requirement.So can anybody help in how to proceed...
Thank you :-)

With Regards,
SRS

On Sep 5, 9:56 am, SRS <sitaram...@gmail.com> wrote:
> I need to design a butterworth approximated low pass, high pass, band
> pass, band stop filter characteristics.This i did using DFT technique
> which is a very heavy algorithm.So My question is how to design the
> FIR for my requirement.So can anybody help in how to proceed...
> Thank you :-)
>
> With Regards,
> SRS

A recent article:

Butterworth Window for Power Spectral Density Estimation Tae Hyun
Yoon, and Eon Kyeong Joo, ETRI Journal, vol.31, no.3, June 2009, pp.
292-297.

available from:

http://etrij.etri.re.kr/Cyber/servle...1&num=3&pg=292

gives an approximate Butterworth window approach that can be applied
to FIR filters through the window based FIR design approach.

Dale B. Dalrymple

On 9/5/2009 9:56 AM, SRS wrote:
> I need to design a butterworth approximated low pass, high pass, band
> pass, band stop filter characteristics.This i did using DFT technique
> which is a very heavy algorithm.So My question is how to design the
> FIR for my requirement.So can anybody help in how to proceed...
> Thank you :-)
>
> With Regards,
> SRS

If you have access to a Parks-McClellan (or Remez exchange) routine with
a 'Hilbert' or 'quadrature' switch, you can use this method for the
Butterworth low pass:

http://www.dspguru.com/comp.dsp/tricks/dsn/nlp_fir.htm

--
Eric Jacobsen
Minister of Algorithms
Abineau Communications
http://www.abineau.com

On 5 Sep, 18:56, SRS <sitaram...@gmail.com> wrote:
> I need to design a butterworth approximated low pass, high pass, band
> pass, band stop filter characteristics.This i did using DFT technique
> which is a very heavy algorithm.So My question is how *to design *the
> FIR *for my requirement.

Why? What's wrong with the usual IIR design methods?

Rune

On Sat, 5 Sep 2009 10:32:21 -0700 (PDT), Dale Dalrymple <[email protected]>
wrote:

>On Sep 5, 9:56 am, SRS <sitaram...@gmail.com> wrote:
>> I need to design a butterworth approximated low pass, high pass, band
>> pass, band stop filter characteristics.This i did using DFT technique
>> which is a very heavy algorithm.So My question is how to design the
>> FIR for my requirement.So can anybody help in how to proceed...
>> Thank you :-)
>>
>> With Regards,
>> SRS
>
>A recent article:
>
>Butterworth Window for Power Spectral Density Estimation Tae Hyun
>Yoon, and Eon Kyeong Joo, ETRI Journal, vol.31, no.3, June 2009, pp.
>292-297.
>
>available from:
>
>http://etrij.etri.re.kr/Cyber/servle...1&num=3&pg=292
>
>gives an approximate Butterworth window approach that can be applied
>to FIR filters through the window based FIR design approach.
>
>Dale B. Dalrymple

Hi Dale,
That's an interesting article.
Thanks for pointing it out to us.

[-Rick-]