Semicomma
From Infogalactic: the planetary knowledge core
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] (<phonos file="Semicomma on C.mid">Play</phonos>). It is derived from the difference in pitch between three 75/64 just augmented seconds (<phonos file="Just augmented second on C.mid">Play just augmented second</phonos>) and one 8/5 just minor sixth (<phonos file="Just minor sixth on C.mid">Play minor sixth</phonos>) begun on the same root ((3 × 274.58) - (1 × 813.69) = 823.74 - 813.69 = 10.05 cents).[3]
See also
Sources
- ↑ 1.0 1.1 Haluska, Jan (2003). The Mathematical Theory of Tone Systems, p.xxix. ISBN 80-88683-28-9.
- ↑ "List of Intervals", Huygens-Fokker.org.
- ↑ "Semicomma", Xenharmonic.Wikispaces.com.