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Name: IIR Filtering: Introduction
ID: m10025
Language: English (en)
Summary: Infinite impulse response (IIR) filters are an alternative to finite impulse response (FIR) filters. Often, an IIR implementaion can meet a given filter specification with less computation than an FIR implementation, but IIR filters induce nonlinear phase and are more sensitive to numerical problems.
Subject: Science and Technology
Keywords: bi-quad, block repeat counter, butter, conv, difference equation, direct form II, DSP, ellip, elliptic low-pass filter, feedback, freqz, gain factor, IIR, impulse response, infinite impulse response, linear time-invariant, LTI, nonlinear phase, notch filter, poles, quantize, zeros
License: Creative Commons Attribution License CC-BY 1.0

Authors: Douglas L. Jones (dl-jones@uiuc.edu), Swaroop Appadwedula (appadwed@uiuc.edu), Matthew Berry (mjberry@uiuc.edu), Mark Haun (markhaun@uiuc.edu), Jake Janovetz (jake@janovetz.com), Michael Kramer (kramer@ifp.uiuc.edu), Dima Moussa (dmoussa@uiuc.edu), Daniel Sachs (sachs@uiuc.edu), Brian Wade (bwade@uiuc.edu)
Copyright Holders: Douglas L. Jones (dl-jones@uiuc.edu), Swaroop Appadwedula (appadwed@uiuc.edu), Matthew Berry (mjberry@uiuc.edu), Mark Haun (markhaun@uiuc.edu), Jake Janovetz (jake@janovetz.com), Michael Kramer (kramer@ifp.uiuc.edu), Dima Moussa (dmoussa@uiuc.edu), Daniel Sachs (sachs@uiuc.edu), Brian Wade (bwade@uiuc.edu)
Maintainers: Douglas L. Jones (dl-jones@uiuc.edu), Swaroop Appadwedula (appadwed@uiuc.edu), Matthew Berry (mjberry@uiuc.edu), Daniel Sachs (sachs@uiuc.edu), Mark Butala (butala@uiuc.edu), Ricardo Radaelli-Sanchez (ricky@alumni.rice.edu), Robert Morrison (rlmorris@uiuc.edu)

Latest version: 2.22 (history)
First publication date: Jun 1, 2001 12:00 am +0000
Last revision to module: Jun 3, 2009 3:27 pm +0000

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Version History

Version: 2.22 Jun 3, 2009 3:27 pm +0000 by Connexions
Changes:
Modified markup for explicit .eps image reference

Version: 2.21 Jun 1, 2009 9:18 am +0000 by Connexions
Changes:
Modified markup for explicit .eps image reference

Version: 2.20 Feb 25, 2004 12:38 pm +0000 by Adan Galvan
Changes:
added maintainer

Version: 2.19 Jul 31, 2003 10:51 am +0000 by Elizabeth Gregory
Changes:
Updated to 0.5 and added a connexion

Version: 2.18 Sep 5, 2002 12:00 am +0000 by (Unknown)
Changes:
added a maintainer

Version: 2.17 Aug 24, 2002 12:00 am +0000 by (Unknown)
Changes:
edited for content and style
edited metadata

Version: 2.16 Aug 21, 2002 12:00 am +0000 by (Unknown)
Changes:
changes figure

Version: 2.15 Aug 19, 2002 12:00 am +0000 by (Unknown)
Changes:
added title for cnxned module

Version: 2.14 Aug 19, 2002 12:00 am +0000 by (Unknown)
Changes:
edited metadata

Version: 2.13 Aug 19, 2002 12:00 am +0000 by (Unknown)
Changes:
edited metadata
upgraded to 0.4

Version: 2.12 Aug 19, 2002 12:00 am +0000 by (Unknown)
Changes:
edited for style and content

Version: 2.11 Jun 12, 2002 12:00 am +0000 by (Unknown)
Changes:
edited for style

Version: 2.10 Jun 11, 2002 12:00 am +0000 by (Unknown)
Changes:
Added maintainers

Version: 2.9 Jun 3, 2002 12:00 am +0000 by (Unknown)
Changes:
Divided module into three parts.

Version: 2.8 May 17, 2002 12:00 am +0000 by (Unknown)
Changes:
removed hardcoded figure numbers in cnxns

Version: 2.7 Mar 17, 2002 12:00 am +0000 by (Unknown)
Changes:
Removed refs to laboratory.  Cleaned up some grammar, corrected version number.

Version: 2.6 Aug 15, 2001 12:00 am +0000 by (Unknown)
Changes:
- Removed excess whitespace in CDATA

Version: 2.5 Aug 14, 2001 12:00 am +0000 by (Unknown)
Changes:
- Added Doug Jones to author/maintainer
- Uploaded pictures

Version: 2.4 Aug 14, 2001 12:00 am +0000 by (Unknown)
Changes:
- Updated to CNXML 0.3.5

Version: 2.3 Jun 12, 2001 12:00 am +0000 by (Unknown)
Changes:
submitted changes too early but the webpage looks weird on this version of mozilla (0.9.1)

Version: 2.2 Jun 12, 2001 12:00 am +0000 by (Unknown)
Changes:
added author, maintainer, and abstract

Version: 2.1 Jun 1, 2001 12:00 am +0000 by (Unknown)
Changes:
created new module

Version: 2.0 Jun 1, 2001 12:00 am +0000 by (Unknown)
Changes:
Added initial template for new module m10025

How to Reuse and Attribute This Content

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If you reuse this work elsewhere, in order to comply with the attribution requirements of the license (CC-BY 1.0), you must include

  • the authors' names: Douglas Jones, Swaroop Appadwedula, Matthew Berry, Mark Haun, Jake Janevitz, Michael Kramer, Dima Moussa, Daniel Sachs, Brian Wade
  • the title of the work: IIR Filtering: Introduction
  • the OpenStax_CNX URL where the work can be found: http://cnx.org/content/m10025/2.22/

See the citation section below for examples you can copy.

How to Cite and Attribute This Content

The following citation styles comply with the attribution requirements for the license (CC-BY 1.0) of this work:

American Chemical Society (ACS) Style Guide:

Jones, D.; Appadwedula, S.; Berry, M.; Haun, M.; Janevitz, J.; Kramer, M.; Moussa, D.; Sachs, D.; Wade, B. IIR Filtering: Introduction, OpenStax_CNX Web site. http://cnx.org/content/m10025/2.22/, Jun 3, 2009.

American Medical Assocation (AMA) Manual of Style:

Jones D, Appadwedula S, Berry M, et al. IIR Filtering: Introduction [OpenStax_CNX Web site]. June 3, 2009. Available at: http://cnx.org/content/m10025/2.22/.

American Psychological Assocation (APA) Publication Manual:

Jones, D., Appadwedula, S., Berry, M., Haun, M., Janevitz, J., Kramer, M., Moussa, D., Sachs, D., & Wade, B. (2009, June 3). IIR Filtering: Introduction. Retrieved from the OpenStax_CNX Web site: http://cnx.org/content/m10025/2.22/

Chicago Manual of Style (Bibliography):

Jones, Douglas, Swaroop Appadwedula, Matthew Berry, Mark Haun, Jake Janevitz, Michael Kramer, Dima Moussa, Daniel Sachs, and Brian Wade. "IIR Filtering: Introduction." OpenStax_CNX. June 3, 2009. http://cnx.org/content/m10025/2.22/.

Chicago Manual of Style (Note):

Douglas Jones and others, "IIR Filtering: Introduction," OpenStax_CNX, June 3, 2009, http://cnx.org/content/m10025/2.22/.

Chicago Manual of Style (Reference, in Author-Date style):

Jones, D., Appadwedula, S., Berry, M., Haun, M., Janevitz, J., Kramer, M., Moussa, D., Sachs, D., & Wade, B. 2009. IIR Filtering: Introduction. OpenStax_CNX, June 3, 2009. http://cnx.org/content/m10025/2.22/.

Modern Languages Association (MLA) Style Manual:

Jones, Douglas, Swaroop Appadwedula, Matthew Berry, Mark Haun, Jake Janevitz, Michael Kramer, Dima Moussa, Daniel Sachs, and Brian Wade. IIR Filtering: Introduction. OpenStax_CNX. 3 June 2009 <http://cnx.org/content/m10025/2.22/>.