| Author |
Message |
bhq
Joined: 11 Jun 2008
Posts: 81
Helped: 7
|
 21 Aug 2008 20:15 Why IIR design in the contineous domain ?? |
|
|
|
| Why we use Butterworth, chebyshev, and elliptical technique to do filltering with IIR
|
|
| Back to top |
|
 |
Kral
Joined: 28 Mar 2005
Posts: 1014
Helped: 165
|
| 22 Aug 2008 19:08 Re: Why IIR design in the contineous domain ?? |
|
|
|
bhq
These filters are used in IIR filter design for the same reasons that they are used in continuous time (analog) filters. They are all optimal in some sense. The Buttorworth is maximally flat. The Chebychev has the maximum stopband attenuation of all filters with a monotonic stop band. The Elliptic (not elliptical) or Cauer filter has the maximum transition band steepness. These filters are tronsformed from a continuous time (s-domain) filter to an IIR filter (z-domain) by some transformation such as the impulse invariant transform or the bilinear z transform. In general, if only the magnitude characteristics are considered, IIR filters provide superior performance to a FIR filter with the same number of multiply-accumulate operations. A. Deczky developed an IIR design technique that allows design of a filter with arbitrary gain vs frequency characteristics. See the book "Programs for Digital Signal Processing" published by the IEE Press. This book is out of print, but readily available used online.
Regards,
Kral
|
|
| Back to top |
|
|
xulfee
Joined: 27 May 2008
Posts: 230
Helped: 25
Location: Pakistan
|
| 27 Aug 2008 6:09 Why IIR design in the contineous domain ?? |
|
|
|
| basically these terms( Butterworth, chebyshev ) are polinomials of mathematics,so much easy to solve in analog domain,by using analong techniques we find out transfer function then we convert it into digital domain by using some appropriate transform
|
|
| Back to top |
|
|
bhq
Joined: 11 Jun 2008
Posts: 81
Helped: 7
|
| 29 Aug 2008 10:56 Re: Why IIR design in the contineous domain ?? |
|
|
|
| Thanks for the help
|
|
| Back to top |
|
|
sajaown
Joined: 10 Sep 2008
Posts: 9
Helped: 1
|
| 11 Sep 2008 11:51 Re: Why IIR design in the contineous domain ?? |
|
|
|
| ya, its very usefull ........
|
|
| Back to top |
|
|
