"Digital" vs. "Analog" Filters
in [Matlab]
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From: Mark Proulx on 16 Apr 2010 16:05 Perhaps a stupid question, but...what is the difference (in Matlab) between "Digital" and "Analog" filters? Example: what's the difference between... [z,p,k] = cheby2(n,R,Wst) and [z,p,k] = cheby2(n,R,Wst,'s')?
From: Rune Allnor on 16 Apr 2010 16:12 On 16 apr, 22:05, "Mark Proulx" <mark.p.pro...(a)boeing.com> wrote: > Perhaps a stupid question, but...what is the difference (in Matlab) between "Digital" and "Analog" filters? One can be implemented in terms of mere numbers, whereas the other must be implemented in terms of physical components like resistors or capacitors. Rune
From: Mark Proulx on 16 Apr 2010 16:23 Rune Allnor <allnor(a)tele.ntnu.no> wrote in message <c2baafbe-c407-423b-955c-4a7be22505bf(a)r27g2000yqn.googlegroups.com>... > On 16 apr, 22:05, "Mark Proulx" <mark.p.pro...(a)boeing.com> wrote: > > Perhaps a stupid question, but...what is the difference (in Matlab) between "Digital" and "Analog" filters? > > One can be implemented in terms of mere numbers, whereas the > other must be implemented in terms of physical components like > resistors or capacitors. > > Rune Rune: Thanks...but since we're speaking of something that happens in Matlab and not on a lab bench, I'm confused as to why Matlab distinguishes between them? Stated differently, both functions yield [z,p,k], I'm having trouble appreciating the difference. (Sorry to be thick.)
From: Rune Allnor on 16 Apr 2010 16:27 On 16 apr, 22:23, "Mark Proulx" <mark.p.pro...(a)boeing.com> wrote: > Rune Allnor <all...(a)tele.ntnu.no> wrote in message <c2baafbe-c407-423b-955c-4a7be2250...(a)r27g2000yqn.googlegroups.com>... > > On 16 apr, 22:05, "Mark Proulx" <mark.p.pro...(a)boeing.com> wrote: > > > Perhaps a stupid question, but...what is the difference (in Matlab) between "Digital" and "Analog" filters? > > > One can be implemented in terms of mere numbers, whereas the > > other must be implemented in terms of physical components like > > resistors or capacitors. > > > Rune > > Rune: > > Thanks...but since we're speaking of something that happens in Matlab and not on a lab bench, I'm confused as to why Matlab distinguishes between them? Some people want the transfer funnctions expressed for digital filters while others want the transfer functions for analog filters. > Stated differently, both functions yield [z,p,k], I'm having trouble appreciating the difference. (Sorry to be thick.) At least you know you don't know. That's a far better starting point than most (well, all) of the alternatives. Rune
From: Mark Proulx on 16 Apr 2010 17:46 Rune Allnor <allnor(a)tele.ntnu.no> wrote in message <c911d77a-52d5-45f3-b48a-e04432510d16(a)q15g2000yqj.googlegroups.com>... > On 16 apr, 22:23, "Mark Proulx" <mark.p.pro...(a)boeing.com> wrote: > > Rune Allnor <all...(a)tele.ntnu.no> wrote in message <c2baafbe-c407-423b-955c-4a7be2250...(a)r27g2000yqn.googlegroups.com>... > > > On 16 apr, 22:05, "Mark Proulx" <mark.p.pro...(a)boeing.com> wrote: > > > > Perhaps a stupid question, but...what is the difference (in Matlab) between "Digital" and "Analog" filters? > > > > > One can be implemented in terms of mere numbers, whereas the > > > other must be implemented in terms of physical components like > > > resistors or capacitors. > > > > > Rune > > > > Rune: > > > > Thanks...but since we're speaking of something that happens in Matlab and not on a lab bench, I'm confused as to why Matlab distinguishes between them? > > Some people want the transfer funnctions expressed for digital filters > while others want the transfer functions for analog filters. > > > Stated differently, both functions yield [z,p,k], I'm having trouble appreciating the difference. (Sorry to be thick.) > > At least you know you don't know. That's a far better starting point > than most (well, all) of the alternatives. > > Rune Rune: I finally put it together. I can truly be a bonehead. Nonetheless, thanks for your time... Mark
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