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Equalization
{{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)

Equalizers are critical to the successful operation of electronic systems such as [[Analog television|analog broadcast television]]. In this application the actual [[waveform]] of the transmitted signal must be preserved, not just its frequency content. Equalizing filters must cancel out any [[group delay and phase delay]] between different frequency components.

== Uses ==

=== Audio and music ===
{{main|Equalization (audio)}}
[[
ImagFile:Shelving-eq.svg|thumb|right|200px|Two first-order shelving filters: a -3&nbsp;dB bass cut (red), and a +9&nbsp;dB treble boost (blue)]]
[[ImagFile:Peaking-eq.svg|thumb|right|200px|Second-order [[linear filter]] functions. Blue: a 9&nbsp;dB boost at 1&nbsp;kHz. Red: a 6&nbsp;dB cut at 100&nbsp;Hz having a higher [[Q factor|Q]] (sharper bandwidth)]]
(contracted; show full)*[[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]]

[[bg:Еквалайзер]]
[[ca:Equalitzador]]
[[cs:Ekvalizér]]
[[da:Equalizer]]
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[[es:Ecualizador]]
[[fr:Égaliseur]]
[[gl:Ecualizador]]
[[it:Equalizzazione]]
[[he:אקולייזר]]
[[kk:Эквалайзер]]
[[nl:Equalizer]]
[[ja:イコライザー (音響機器)]]
[[no:Equalizer]]
[[pl:Korektor (akustyka)]]
[[pt:Equalizador]]
[[ru:Эквалайзер]]
[[fi:Ekvalisaattori]]
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[[tr:Eşitleme (ses)]]
[[uk:Еквалайзер]]
[[zh:等化器]]