Re: [Cs-dev] [OT] How to produce IIR filter coefficients from a set ofpoints describing the frequency response

Re: [Cs-dev] [OT] How to produce IIR filter coefficients from a set ofpoints describing the frequency response

Date	2009-05-15 23:14
From	Jim Bates
Subject	Re: [Cs-dev] [OT] How to produce IIR filter coefficients from a set ofpoints describing the frequency response
Attachments	None None
	From: victor <Victor.Lazzarini@nuim.ie> 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

Date	2009-05-16 03:08
From	Andres Cabrera
Subject	Re: [Cs-dev] [OT] How to produce IIR filter coefficients from a set ofpoints describing the frequency response
	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 wrote: > From: victor > 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 > ------------------------------------------------------------------------------ > Crystal Reports - New Free Runtime and 30 Day Trial > Check out the new simplified licensing option that enables > unlimited royalty-free distribution of the report engine > for externally facing server and web deployment. > http://p.sf.net/sfu/businessobjects > _______________________________________________ > Csound-devel mailing list > Csound-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/csound-devel > > -- Andrés ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Csound-devel mailing list Csound-devel@lists.sourceforge.net

Date	2009-05-16 03:12
From	Andres Cabrera
Subject	Re: [Cs-dev] [OT] How to produce IIR filter coefficients from a set ofpoints 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 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 wrote: >> From: victor >> 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 >> ------------------------------------------------------------------------------ >> Crystal Reports - New Free Runtime and 30 Day Trial >> Check out the new simplified licensing option that enables >> unlimited royalty-free distribution of the report engine >> for externally facing server and web deployment. >> http://p.sf.net/sfu/businessobjects >> _______________________________________________ >> Csound-devel mailing list >> Csound-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/csound-devel >> >> > > > > -- > > > Andrés > -- Andrés ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Csound-devel mailing list Csound-devel@lists.sourceforge.net

Date	2009-05-16 07:20
From	victor
Subject	Re: [Cs-dev] [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" To: "Developer discussions" 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 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 wrote: >> From: victor >> 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 >> ------------------------------------------------------------------------------ >> Crystal Reports - New Free Runtime and 30 Day Trial >> Check out the new simplified licensing option that enables >> unlimited royalty-free distribution of the report engine >> for externally facing server and web deployment. >> http://p.sf.net/sfu/businessobjects >> _______________________________________________ >> Csound-devel mailing list >> Csound-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/csound-devel >> >> > > > > -- > > > Andrés > -- Andrés ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Csound-devel mailing list Csound-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/csound-devel ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Csound-devel mailing list Csound-devel@lists.sourceforge.net

Date	2009-05-17 17:36
From	Andres Cabrera
Subject	Re: [Cs-dev] [OT] How to produce IIR filter coefficients from a setofpoints describing the frequency response
	Yes, that's what I was looking for. The great thing is that I can use this from sage. Thanks for the ideas. Cheers, Andrés On Sat, May 16, 2009 at 1:20 AM, victor wrote: > Octave seems to have it: > https://prof.hti.bfh.ch/sha1/Octave/index/f/invfreqz.html > ----- Original Message ----- > From: "Andres Cabrera" > To: "Developer discussions" > 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 > 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 wrote: >>> From: victor >>> 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 >>> ------------------------------------------------------------------------------ >>> Crystal Reports - New Free Runtime and 30 Day Trial >>> Check out the new simplified licensing option that enables >>> unlimited royalty-free distribution of the report engine >>> for externally facing server and web deployment. >>> http://p.sf.net/sfu/businessobjects >>> _______________________________________________ >>> Csound-devel mailing list >>> Csound-devel@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/csound-devel >>> >>> >> >> >> >> -- >> >> >> Andrés >> > > > > -- > > > Andrés > > ------------------------------------------------------------------------------ > Crystal Reports - New Free Runtime and 30 Day Trial > Check out the new simplified licensing option that enables > unlimited royalty-free distribution of the report engine > for externally facing server and web deployment. > http://p.sf.net/sfu/businessobjects > _______________________________________________ > Csound-devel mailing list > Csound-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/csound-devel > > > ------------------------------------------------------------------------------ > Crystal Reports - New Free Runtime and 30 Day Trial > Check out the new simplified licensing option that enables > unlimited royalty-free distribution of the report engine > for externally facing server and web deployment. > http://p.sf.net/sfu/businessobjects > _______________________________________________ > Csound-devel mailing list > Csound-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/csound-devel > -- Andrés ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Csound-devel mailing list Csound-devel@lists.sourceforge.net