On Oct 17, 6:53�am, "commengr" <communications_engin...@yahoo.com> wrote:> >On Oct 16, 2:01=A0pm, Clay <c...@claysturner.com> wrote: > >> On Oct 16, 9:19=A0am, "commengr" <communications_engin...@yahoo.com> > >> wrote: > > >> > Hello, > > >> > I have a question that why can't some IIR filter design methods like > >> > Impulse Invariant & Approximation of derivatives be used (or have > poor > >> > response) as band-pass, notch and high-pass filters > > >> > I think the reason for approximation of derivatives is that we can't > go > >> > beyond fs/4 on the Z-plane, so high-pass is out. But what is the > issue = > >with > >> > band-stop and band-pass for a small pass-band? > > >> > Can some one explain? Robert, Glen? > > >> Aliasing is your problem if you blindly try to sample the impulse > >> response of a highpas filter. Same issue with derivatives. > > >what's being aliased is not the spectrum of your signal. �an IIR > >filter designed by either method is still a legit LTI discrete-time > >system. �but the frequency response that corresponds to the continuous- > >time impulse response that you've sampled will be an aliased version > >of the continuous-time frequency response. > > Effectively meaning that we lose the attenuation of the filter where we > have aliasing in frequency domain? >i guess so. what often happens is, at frequencies where the unaliased frequency response gain dives to zero, the aliased frequency response gets something non-zero added to the gain. r b-j
Why some IIR filter methods can't be used for High Pass Filters?
Started by ●October 16, 2009
Reply by ●October 18, 20092009-10-18
Reply by ●October 19, 20092009-10-19
commengr wrote:>>>Methods do work. It is just you who doesn't know how to use >them >>>properly. >> >> >>Omg, you are so arrogant.... >> >> > > > I think Vladimir is a wanna be Simon Cowell... of compdspI had to check with google about Simon Cowell... My dear underdeveloped freind; if I was you, I'd watch less TV and read more books. VLV
Reply by ●October 20, 20092009-10-20
> > >commengr wrote: > >>>>Methods do work. It is just you who doesn't know how to use >them >>>>properly. >>> >>> >>>Omg, you are so arrogant.... >>> >>> >> >> >> I think Vladimir is a wanna be Simon Cowell... of compdsp > >I had to check with google about Simon Cowell... >My dear underdeveloped freind; if I was you, I'd watch less TV and read >more books. > > >VLV > >Actually my dearer friend Vladimir, every normal person able to understand english knows about the antics of Simon Cowell. Are you really from Russia? I kind of figure you would be from Russia. Love it by the way :)
Reply by ●October 20, 20092009-10-20
commengr wrote:>> >> commengr wrote: >> >>>>> Methods do work. It is just you who doesn't know how to use >them >>>>> properly. >>>> >>>> Omg, you are so arrogant.... >>>> >>>> >>> >>> I think Vladimir is a wanna be Simon Cowell... of compdsp >> I had to check with google about Simon Cowell... >> My dear underdeveloped freind; if I was you, I'd watch less TV and read >> more books. >> >> >> VLV >> >> > > > Actually my dearer friend Vladimir, every normal person able to understand > english knows about the antics of Simon Cowell.I guess I'm abnormal. I never watch that juvenile crap. Like Vlad, I googled it.> Are you really from Russia? I kind of figure you would be from Russia. > Love it by the way :)Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●October 20, 20092009-10-20
commengr wrote:> Actually my dearer friend Vladimir, every normal person able to understand > english knows about the antics of Simon Cowell.http://s.lurkmore.ru/images/4/42/Tvass.jpg VLV
Reply by ●October 20, 20092009-10-20
On Oct 20, 11:39�am, Vladimir Vassilevsky <nos...@nowhere.com> wrote:> commengr wrote: > > Actually my dearer friend Vladimir, every normal person able to understand > > english knows about the antics of Simon Cowell. > > http://s.lurkmore.ru/images/4/42/Tvass.jpg >that pix purty good. like Jerry or Vlad, i never watched American Idol or Millionare or Lost or any of the other "reality TV" crap either, but i knew (i guess from snippets on news or Nightline or something) who and how friendly Simon Cowell is. i imagine that since so much on any of these shows is crap (as depicted in the TVass.jpg) that much of the vitriol that is emitted by Cowell is likely deserved. each generation has their crap that is recognized as such by the other generations and unrecognized (or denied) by much of the generation emitting it. i mean, there was some really dopey stuff coming out of the 70s. r b-j
Reply by ●October 21, 20092009-10-21
>On Oct 20, 11:39=A0am, Vladimir Vassilevsky <nos...@nowhere.com> wrote: >> commengr wrote: >> > Actually my dearer friend Vladimir, every normal person able tounderst=>and >> > english knows about the antics of Simon Cowell. >> >> http://s.lurkmore.ru/images/4/42/Tvass.jpg >> > >that pix purty good. like Jerry or Vlad, i never watched American >Idol or Millionare or Lost or any of the other "reality TV" crap >either, but i knew (i guess from snippets on news or Nightline or >something) who and how friendly Simon Cowell is. i imagine that since >so much on any of these shows is crap (as depicted in the TVass.jpg) >that much of the vitriol that is emitted by Cowell is likely deserved. > >each generation has their crap that is recognized as such by the other >generations and unrecognized (or denied) by much of the generation >emitting it. i mean, there was some really dopey stuff coming out of >the 70s. > >r b-j > >This is what I meant. Living in Pakistan, Simon Cowell doesn't really interest me, don't even get to watch the show, its just that I keep reading his name in the newspaper, or hearing it on the news ... but one does get to know about him The reason I might know about him & you (Vlad) don't, may also be the generation gap or different culture. God knows how old Vlad is. But honestly Vlad, your arrogant antics are fun. I tried to google you too Vlad! Have a good day you all, but I suppose its night on your side of the planet
Reply by ●October 21, 20092009-10-21
On Oct 21, 12:29�am, "commengr" <communications_engin...@yahoo.com> wrote:> > Living in Pakistan,...hey, i said this before: stay safe over there. with Al Quaeda, Taliban, neighbors like Afghanistan Iran India China Kashmir, some with nukes and some nuke wannabees, your own nukes, currently the centroid of Islamic extremism, Obama saying on the campaign trail that he might cross the line from Afghantistan, political assassination, full-scale military operations inside the border, geez what a mess. please be careful and stay safe over there. don't get blown up or anything. in college, i had a roommate from Karachi who was a Parsi (Zoroastrian). just FYI. r b-j
