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Equalization
{{merge from|Equalizer (communications)|discuss=Talk:Equalization#Equalization_organization|date=January 2013}}

{{about|electronic compensation for systems' uneven frequency responses|equalization particularly as used in sound recording and reproduction|Equalization (audio)}}
{{other uses|Equalization (disambiguation)}}

(contracted; show full)
{{main|Equalizer (communications)}}
Modern digital telephone systems have less trouble in the voice frequency range as only the local line to the subscriber now remains in analog format, but [[Digital Subscriber Line|DSL]] circuits operating in the [[MegaHertz|MHz]] range on those same wires may suffer severe [[attenuation distortion]], which is dealt with by automatic equalization or by abandoning the worst frequencies.  [[Videophone|Picturephone]] circuits also had equalizers.


== Implementations ==
* [[Susa (software)|Susa]] - framework implements equalizers for digital communications in C++.⏎
==See also==
*[[Blind equalization]]
*[[Electronic filter]]
*[[Adaptive equalizer]]
*[[Loudness compensation]]
*[[Weighting filter]]

==References==
{{Reflist}}
<div class="references-small">
:*Glen Ballou, "Filters and equalizers", ''Handbook for Sound Engineers'', Fourth edition, Focal Press, 2008 ISBN 0-240-80969-6.
</div>

==External links==
{{Wiktionary|equalisation|equalization}}
*[http://www.audiocheck.net/engineertraining_bands_difficult.php Discriminating EQ frequencies by ear]
*[http://www.sengpielaudio.com/calculator-bandwidth.htm Calculator: bandwidth per octave ''<math>N</math>'' to quality factor ''<math>Q</math>'' and back]
*[http://www.idc.ul.ie/idcwiki/index.php/Equalisation EQ Condensed Overview]
*[http://www.wikirecording.org/EQ WikiRecording's Guide to Equalization]
*[http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt Audio EQ Cookbook]

{{Music technology}}

[[Category:Audio effects]]
[[Category:Linear filters]]
[[Category:Tone, EQ and filter]]