How to design/specify a window?
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From: Richard Owlett on 19 Jan 2006 18:45 I am neophyte [ perhaps read ignorant ;] I've been told that a poorly chosen window can cause problems .} For my application the ratio of "maximumly flat" to transition region is > 1000:1. What should I be considering? where should I be looking? Thanks [PS this group has made a start on teaching me to *explicitly* say THANK YOU. ] therefore DANKE
From: Mike Yarwood on 19 Jan 2006 19:13 "Richard Owlett" <rowlett(a)atlascomm.net> wrote in message news:11t094t18t1dp02(a)corp.supernews.com... >I am neophyte [ perhaps read ignorant ;] > > I've been told that a poorly chosen window can cause problems .} > > For my application the ratio of "maximumly flat" to transition region is > > 1000:1. > > What should I be considering? > where should I be looking? > Hi Richard! I'm afraid I don't know much about filters so I'm not going to be much help (so I've snipped the Dankje ) - you might get a quicker response from someone who knows what he/she is talking about if you tell him/her what you mean by transition region though. Best of luck - Mike
From: Richard Owlett on 19 Jan 2006 19:48 Mike Yarwood wrote: > "Richard Owlett" <rowlett(a)atlascomm.net> wrote in message > news:11t094t18t1dp02(a)corp.supernews.com... > >>I am neophyte [ perhaps read ignorant ;] >> >>I've been told that a poorly chosen window can cause problems .} >> >>For my application the ratio of "maximumly flat" to transition region is >> >>>1000:1. >> >>What should I be considering? >>where should I be looking? >> > > Hi Richard! I'm afraid I don't know much about filters so I'm not going to > be much help (so I've snipped the Dankje ) - you might get a quicker > response from someone who knows what he/she is talking about if you tell > him/her what you mean by transition region though. > > Best of luck - Mike > > a supposedly "perfect" filter would be a "brickwall" infinite attenuation below f1 and over f2, otherwise none the Fourier transform to time domain has nasty repercussions the inverse is also true ;] To the experts -- I know that was a lousy/lossy response. Is it correct as far as I went?
From: Mike Yarwood on 19 Jan 2006 20:09 "Richard Owlett" <rowlett(a)atlascomm.net> wrote in message news:11t0cqdtoisoh6d(a)corp.supernews.com... > Mike Yarwood wrote: > >> "Richard Owlett" <rowlett(a)atlascomm.net> wrote in message >> news:11t094t18t1dp02(a)corp.supernews.com... >> >>>I am neophyte [ perhaps read ignorant ;] >>> >>>I've been told that a poorly chosen window can cause problems .} >>> >>>For my application the ratio of "maximumly flat" to transition region is >>> >>>>1000:1. >>> >>>What should I be considering? >>>where should I be looking? >>> >> >> Hi Richard! I'm afraid I don't know much about filters so I'm not going >> to be much help (so I've snipped the Dankje ) - you might get a quicker >> response from someone who knows what he/she is talking about if you tell >> him/her what you mean by transition region though. > a supposedly "perfect" filter would be a "brickwall" > infinite attenuation below f1 and over f2, otherwise none > > the Fourier transform to time domain has nasty repercussions > the inverse is also true ;] > > To the experts -- I know that was a lousy/lossy response. > Is it correct as far as I went? > I dunno - but I've just realised I read your "maximumly flat" as "maximally flat", now I really haven't got a clue what you mean so I'll just shut up. Best of Luck - Mike
From: Richard Owlett on 19 Jan 2006 21:08 Mike Yarwood wrote: > "Richard Owlett" <rowlett(a)atlascomm.net> wrote in message > news:11t0cqdtoisoh6d(a)corp.supernews.com... > >>Mike Yarwood wrote: >> >> >>>"Richard Owlett" <rowlett(a)atlascomm.net> wrote in message >>>news:11t094t18t1dp02(a)corp.supernews.com... >>> >>> >>>>I am neophyte [ perhaps read ignorant ;] >>>> >>>>I've been told that a poorly chosen window can cause problems .} >>>> >>>>For my application the ratio of "maximumly flat" to transition region is >>>> >>>> >>>>>1000:1. >>>> >>>>What should I be considering? >>>>where should I be looking? >>>> >>> >>>Hi Richard! I'm afraid I don't know much about filters so I'm not going >>>to be much help (so I've snipped the Dankje ) - you might get a quicker >>>response from someone who knows what he/she is talking about if you tell >>>him/her what you mean by transition region though. > > >>a supposedly "perfect" filter would be a "brickwall" >>infinite attenuation below f1 and over f2, otherwise none >> >>the Fourier transform to time domain has nasty repercussions >>the inverse is also true ;] >> >>To the experts -- I know that was a lousy/lossy response. >>Is it correct as far as I went? >> > > I dunno - but I've just realised I read your "maximumly flat" as "maximally > flat", now I really haven't got a clue what you mean so I'll just shut up. > > Best of Luck - Mike > > Not to worry, probably makes at least two of us ;] We'll wait for Avins &/or Lyons to translate Owl to Normal ;]
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