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[[File:Semicomma.png|thumb|right|Semicomma on C {{audio|Semicomma on C.mid|Play}}.]] | |||
The '''semicomma''',<ref name="Haluska">Haluska, Jan (2003). ''The Mathematical Theory of Tone Systems'', p.xxix. ISBN 80-88683-28-9.</ref> also '''Fokker's comma''' (after [[31-TET]] pioneer [[Adriaan Fokker]]), is type of small [[interval (music)|musical interval]], or [[comma (music)|comma]], in [[microtonal music]] equivalent to 2109375:2097152,<ref name="Haluska"/> or <math>3^3\cdot5^7:2^{21}</math>. This is a ratio of approximately 1:1.0058283805847168, or about 10.06 [[cent (music)|cent]]s<ref>"[http://www.huygens-fokker.org/docs/intervals.html List of Intervals]", ''Huygens-Fokker.org''.</ref> ({{audio|Semicomma on C.mid|Play}}). It is derived from the difference in pitch between three 75/64 just augmented seconds ({{audio|Just augmented second on C.mid|Play just augmented second}}) and one 8/5 just minor sixth ({{audio|Just minor sixth on C.mid|Play minor sixth}}) begun on the same root ((3 × 274.58) - (1 × 813.69) = 823.74 - 813.69 = 10.05 cents).<ref>"[http://xenharmonic.wikispaces.com/semicomma Semicomma]", ''Xenharmonic''.</ref> | |||
==See also== | |||
*[[Septimal kleisma]] | |||
*[[Septimal semicomma]] | |||
==Sources== | |||
<references/> | |||
{{Intervals|state=expanded}} | |||
[[Category:5-limit tuning and intervals]] | |||
[[Category:Commas]] |
Latest revision as of 22:17, 11 January 2014
The semicomma,[1] also Fokker's comma (after 31-TET pioneer Adriaan Fokker), is type of small musical interval, or comma, in microtonal music equivalent to 2109375:2097152,[1] or . This is a ratio of approximately 1:1.0058283805847168, or about 10.06 cents[2] (My name: Lindsey Gavin
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See also
Sources
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