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Colors of noise
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===Green noise=== {{Listen|filename=GreenNoise.ogg|title=10 seconds of Wisniewski's version of green noise|description=}} * The mid-frequency component of white noise, used in [[halftone]] [[dithering]]<ref>{{cite journal | first1 = Daniel Leo | last1 = Lau | first2 = Gonzalo R. | last2 = Arce | first3 = Neal C. | last3 = Gallagher | title = Green-noise digital halftoning | journal = Proceedings of the IEEE | volume = 86 | number = 12 | year = 1998 | pages = 2424β42 | doi=10.1109/5.735449 }}</ref> * Bounded Brownian noise * Vocal spectrum noise used for testing audio circuits<ref name="comp.dsp FAQ">{{cite newsgroup | title = Colors of noise pseudo FAQ, version 1.3 | author = Joseph S. Wisniewski | date = 7 October 1996 | newsgroup = comp.dsp | url = https://www.ptpart.co.uk/colors-of-noise/ | access-date = 2011-03-01 | url-status = dead | archive-url = https://web.archive.org/web/20110430151608/https://www.ptpart.co.uk/colors-of-noise | archive-date = 30 April 2011 }}</ref> * Joseph S. Wisniewski writes that "green noise" is marketed by producers of ambient sound effects recordings as "the background noise of the world". It simulates the spectra of natural settings, without human-made noises. It is similar to pink noise, but has more energy in the area of 500 Hz.<ref name="comp.dsp FAQ"/>
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