Grey noise: Difference between revisions
Some cleanup and better explanations. Clarified that *the* grey noise doesn't exist. This article doesn't need that much attention because the actual work is done in the equal-loudness curves article. |
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{{Colors of noise}} |
{{Colors of noise}} |
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'''Grey noise''' is random noise subjected to a [[psychoacoustic]] [[equal loudness curve]] (such as an ''inverted'' [[A-weighting]] curve) over a given range of |
'''Grey noise''' is random noise subjected to a [[psychoacoustic]] [[equal loudness curve]] (such as an ''inverted'' [[A-weighting]] curve) over a given range of frequencies. |
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[[Image:Gray noise spectrum.svg|thumb|left|Grey noise spectrum]] |
[[Image:Gray noise spectrum.svg|thumb|left|Grey noise spectrum]] |
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The result is that grey noise contains all frequencies with equal [[loudness]], as opposed to [[white noise]], which contains all frequencies with equal ''energy''. The difference between the two is the result of [[psychoacoustics]], more specifically the fact that the human hearing is more sensitive to some frequencies than others. |
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This is in contrast to [[white noise]], noise which has the same energy at all frequencies but is not perceived as equally loud to [[psychoacoustics]]. ''See [[Colors of noise]]''. |
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Since equal-loudness curves depend not only on the individual but also on the volume at which the noise is played back, there is no one true grey noise.<ref>http://www.audiocheck.net/testtones_greynoise.php</ref> A mathematically simpler and clearly defined approximation of an equal-loudness noise is [[pink noise]] which creates an equal amount of energy per octave, not per hertz (i. e. a logarithmic instead of a linear behavior), so pink noise is closer to “equally loud at all frequencies” than white noise is.<ref>http://www.acousticfields.com/white-noise-definition-vs-pink-noise/</ref> |
Since equal-loudness curves depend not only on the individual but also on the volume at which the noise is played back, there is no one true grey noise.<ref>http://www.audiocheck.net/testtones_greynoise.php</ref> A mathematically simpler and clearly defined approximation of an equal-loudness noise is [[pink noise]] which creates an equal amount of energy per octave, not per hertz (i. e. a logarithmic instead of a linear behavior), so pink noise is closer to “equally loud at all frequencies” than white noise is.<ref>http://www.acousticfields.com/white-noise-definition-vs-pink-noise/</ref> |
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{{Listen|filename=Gray noise.ogg|title=10 seconds of grey noise|description=}} |
{{Listen|filename=Gray noise.ogg|title=10 seconds of grey noise|description=}} |
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== See also == |
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* [[Colors of noise]] |
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==References== |
==References== |
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Revision as of 12:13, 2 August 2016
| Colors of noise |
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Grey noise is random noise subjected to a psychoacoustic equal loudness curve (such as an inverted A-weighting curve) over a given range of frequencies.
The result is that grey noise contains all frequencies with equal loudness, as opposed to white noise, which contains all frequencies with equal energy. The difference between the two is the result of psychoacoustics, more specifically the fact that the human hearing is more sensitive to some frequencies than others.
Since equal-loudness curves depend not only on the individual but also on the volume at which the noise is played back, there is no one true grey noise.[1] A mathematically simpler and clearly defined approximation of an equal-loudness noise is pink noise which creates an equal amount of energy per octave, not per hertz (i. e. a logarithmic instead of a linear behavior), so pink noise is closer to “equally loud at all frequencies” than white noise is.[2]
See also
References
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