Hello, I'm now designing a IIR interpolation filter. The interpolation filter consists of a IIR lowpass filter stage and a Sinc filter stage. I dont know how to compensate for the passband droop of the Sinc filter. Can you help me? Daniel This message was sent using the Comp.DSP web interface on www.DSPRelated.com
How to compensate for the passband droop of a Sinc filter with an IIR filter?
Started by ●October 21, 2005
Reply by ●October 21, 20052005-10-21
in article pPednXjgOfe4XsXeRVn-ug@giganews.com, daniel zuo at zuo_qi@126.com wrote on 10/21/2005 06:29:> Hello, > > I'm now designing a IIR interpolation filter. The interpolation filter > consists of a IIR lowpass filter stage and a Sinc filter stage. I dont > know how to compensate for the passband droop of the Sinc filter. Can you > help me?i don't see how a sinc impulse response will give you much passband droop. any droop that you get because of a finite length sinc is gonna be pretty hard to fix much with the preceding IIR. it really should be the other way around: whatever passband droop you get with the IIR should be fixed (to the extent possible) by more optimally designing the following FIR.> Daniel > > > > > This message was sent using the Comp.DSP web interface on > www.DSPRelated.commy advise: posting from DSPRelated.com does not help. if you can't get your own newsserver, use Google Groups. my advice for DSPRelated.com is for them to drop their message on the bottom if they want to serve their clientele well. -- r b-j rbj@audioimagination.com "Imagination is more important than knowledge."
Reply by ●October 22, 20052005-10-22
robert bristow-johnson wrote:>> This message was sent using the Comp.DSP web interface on >> www.DSPRelated.com > > my advise: posting from DSPRelated.com does not help.It should not have adverse consequences either unless people choose to punish web-to-news gateway users for the phenomenon's existence.> my advice for DSPRelated.com is for them to drop their message > on the bottom if they want to serve their clientele well.You're suggesting that the maintainers have something to conceal. Where's the sense in that? And why don't you actually advise them, in a way they can be expected to notice? Martin -- Sphinx of black quartz, judge my vow! --David Lemon
Reply by ●October 22, 20052005-10-22
Martin Eisenberg wrote:> robert bristow-johnson wrote: > > >>>This message was sent using the Comp.DSP web interface on >>>www.DSPRelated.com >> >>my advise: posting from DSPRelated.com does not help. > > > It should not have adverse consequences either unless people choose > to punish web-to-news gateway users for the phenomenon's existence. > > >>my advice for DSPRelated.com is for them to drop their message >>on the bottom if they want to serve their clientele well. > > > You're suggesting that the maintainers have something to conceal. > Where's the sense in that? And why don't you actually advise them, > in a way they can be expected to notice?Oh, Martin! If only everyone were as sensible and serene as you! Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●October 22, 20052005-10-22
in article 1129995749.691813@ostenberg.wh.uni-dortmund.de, Martin Eisenberg at martin.eisenberg@udo.edu wrote on 10/22/2005 11:42:> robert bristow-johnson wrote: > >>> This message was sent using the Comp.DSP web interface on >>> www.DSPRelated.com >> >> my advise: posting from DSPRelated.com does not help. > > It should not have adverse consequences either unless people choose > to punish web-to-news gateway users for the phenomenon's existence.sorry, but the association that the label has with the "quality of post or posited question" is developing a sorta reputation like someone posting with an address ####@aol.com .>> my advice for DSPRelated.com is for them to drop their message >> on the bottom if they want to serve their clientele well. > > You're suggesting that the maintainers have something to conceal.i'm suggesting that the maintainers are not helping their users/clients by putting the little ad on the bottom. it identifies the poster as a sorta AOL-dot-commer. eventually their clients will look for another web-to-news gateway (like Google) and that will not be to the benefit of DSPRelated.com.> Where's the sense in that?i just typed it.> And why don't you actually advise them, > in a way they can be expected to notice?i sent the same message to them via their "Contact" page at the same time i posted my reply you are referring to. -- r b-j rbj@audioimagination.com "Imagination is more important than knowledge."
Reply by ●October 22, 20052005-10-22
Jerry Avins wrote:> Oh, Martin! If only everyone were as sensible and serene as you!If only I always were... Martin -- Education is the ability to listen to almost anything without losing your temper. --Robert Frost
Reply by ●October 22, 20052005-10-22
robert bristow-johnson wrote:> in article 1129995749.691813@ostenberg.wh.uni-dortmund.de, > Martin Eisenberg at martin.eisenberg@udo.edu wrote on 10/22/2005 > 11:42: > >> robert bristow-johnson wrote: >> >>>> This message was sent using the Comp.DSP web interface on >>>> www.DSPRelated.com >>> >>> my advise: posting from DSPRelated.com does not help. >> >> It should not have adverse consequences either unless people >> choose to punish web-to-news gateway users for the phenomenon's >> existence. > > sorry, but the association that the label has with the "quality > of post or posited question" is developing a sorta reputation > like someone posting with an address ####@aol.com .Like AOL, those gateways bring many people into contact with Usenet who are unaccustomed to a culture that has developed in a relatively structured environment over many years, in contrast to the often ad-hoc flavor of web fora. There is obviously a potential for irritation on both sides of that enounter as newcomers feel patronized while long-timers try to preserve their values. This is, however, a natural consequence of general growth in networked communication rather than a problem with individual labels or users. In particular, the same influx via newsswervers only -- or via Google Groups for that matter -- would lead to exactly the same trouble.>>> my advice for DSPRelated.com is for them to drop their message >>> on the bottom if they want to serve their clientele well. >> >> You're suggesting that the maintainers have something to >> conceal. > > i'm suggesting that the maintainers are not helping their > users/clients by putting the little ad on the bottom. it > identifies the poster as a sorta AOL-dot-commer.That's what you think, but it is an in-group view presupposing either that growing access is suspect in itself or that new users can reasonably be expected to know about established Usenet codes of conduct. The latter was true to an extent when most people got introduced to Usenet in a work or academic context, in easily assimilated numbers; the former sentiment is one reaction to actual patterns of technology use ceasing to be that way.> eventually their clients will look for another web-to-news > gateway (like Google) and that will not be to the benefit of > DSPRelated.com.One of the DSPRelated.com folks has just recently asked for comments on a layout for access by topic category they want to implement. That is something Google is unlikely to do and can add substantive value to their service, surely enough to bind even those the appended bit actually bothers. Martin -- The problems will overcome the benefits.
Reply by ●October 22, 20052005-10-22
listen Martin, perhaps everything you say here (below) is true. i'm not giving carte blanche to everything, but let's suppose, for the moment it is all true. it doesn't change the fact that the bottom sig:>>>>> This message was sent using the Comp.DSP web interface on >>>>> www.DSPRelated.comis getting an association with posts from newbies, maybe students, etc with posts that are sometimes not OT (but posed as OT) and more often than not with poorly framed questions that really just cannot be answered. now, in a way, that's okay. comp.dsp is here to help folks iron out misconceived questions into better ones (and often, once the question is fixed, the answer is right there). but if keep getting getting a statistical correlation between the DSPRelated.com sig and some of these questions, it *will*, just like it does for aol.com (not everyone who uses AOL is a wanker), start to discourage many of us from taking posts from there seriously. that *can't* be good for those posting from DSPRelated.com . and eventually they'll try something else (like Google Groups or they'll find that they already *have* a newsserver at their ISP or school or work) and see if they get better results. and that can't be good for DSPRelated.com . so, whether or not you are correct, it's a perception thing, and i challenge you to make the case that the DSPRelated.com sig makes us *want* to be more helpful or to take the poster more seriously. i just don't think you can make that case. and then, i can't see how it helps DSPRelated.com to include that sig on the bottom of each post coming out. there will be backlash because it's unsightly and has no redeeming value. -- r b-j rbj@audioimagination.com "Imagination is more important than knowledge." in article 1130026654.419152@ostenberg.wh.uni-dortmund.de, Martin Eisenberg at martin.eisenberg@udo.edu wrote on 10/22/2005 20:17:> robert bristow-johnson wrote: > >> in article 1129995749.691813@ostenberg.wh.uni-dortmund.de, >> Martin Eisenberg at martin.eisenberg@udo.edu wrote on 10/22/2005 >> 11:42: >> >>> robert bristow-johnson wrote: >>> >>>>> This message was sent using the Comp.DSP web interface on >>>>> www.DSPRelated.com >>>> >>>> my advise: posting from DSPRelated.com does not help. >>> >>> It should not have adverse consequences either unless people >>> choose to punish web-to-news gateway users for the phenomenon's >>> existence. >> >> sorry, but the association that the label has with the "quality >> of post or posited question" is developing a sorta reputation >> like someone posting with an address ####@aol.com . > > Like AOL, those gateways bring many people into contact with Usenet > who are unaccustomed to a culture that has developed in a > relatively structured environment over many years, in contrast to the > often ad-hoc flavor of web fora. There is obviously a potential for > irritation on both sides of that enounter as newcomers feel > patronized while long-timers try to preserve their values. This is, > however, a natural consequence of general growth in networked > communication rather than a problem with individual labels or users. > In particular, the same influx via newsswervers only -- or via Google > Groups for that matter -- would lead to exactly the same trouble. > >>>> my advice for DSPRelated.com is for them to drop their message >>>> on the bottom if they want to serve their clientele well. >>> >>> You're suggesting that the maintainers have something to >>> conceal. >> >> i'm suggesting that the maintainers are not helping their >> users/clients by putting the little ad on the bottom. it >> identifies the poster as a sorta AOL-dot-commer. > > That's what you think, but it is an in-group view presupposing either > that growing access is suspect in itself or that new users can > reasonably be expected to know about established Usenet codes of > conduct. The latter was true to an extent when most people got > introduced to Usenet in a work or academic context, in easily > assimilated numbers; the former sentiment is one reaction to actual > patterns of technology use ceasing to be that way. > >> eventually their clients will look for another web-to-news >> gateway (like Google) and that will not be to the benefit of >> DSPRelated.com. > > One of the DSPRelated.com folks has just recently asked for comments > on a layout for access by topic category they want to implement. That > is something Google is unlikely to do and can add substantive value > to their service, surely enough to bind even those the appended bit > actually bothers.
Reply by ●October 22, 20052005-10-22
robert bristow-johnson <rbj@audioimagination.com> writes:> [...]> i challenge you to make the case that the DSPRelated.com sig makes > us *want* to be more helpful or to take the poster more seriously.Anyone I see using such an interface instead of the direct usenet news interface has an immediate notch against them no matter the content or demeanor of their post. Why go around the block to go to the bathroom? -- % Randy Yates % "Watching all the days go by... %% Fuquay-Varina, NC % Who are you and who am I?" %%% 919-577-9882 % 'Mission (A World Record)', %%%% <yates@ieee.org> % *A New World Record*, ELO http://home.earthlink.net/~yatescr
Reply by ●October 22, 20052005-10-22
robert bristow-johnson wrote:> ... i can't see how it helps DSPRelated.com to > include that sig on the bottom of each post coming out. there will be > backlash because it's unsightly and has no redeeming value.So it's an ego thing on Stephane's part. It may not be cool, but he put a lot of work into the project and that entitles him. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
