140/81: Difference between revisions
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m Mention of enneadecal (and replace of old description) |
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{{Infobox Interval | {{Infobox Interval | ||
| Name = septimal inframinor seventh | |||
| Name = | |||
| Color name = zy7, zoyo 7th | | Color name = zy7, zoyo 7th | ||
| Sound = Ji-140-81-csound-foscil-220hz.mp3 | | Sound = Ji-140-81-csound-foscil-220hz.mp3 | ||
}} | }} | ||
'''140/81''', the | '''140/81''', the '''septimal inframinor seventh''' is a [[7-limit]] [[interseptimal]] ratio of about 947 [[cent]]s. It is flat of a minor seventh [[16/9]] by a septimal quartertone [[36/35]], flat of a subminor seventh [[7/4]] by a syntonic comma [[81/80]], and sharp of a supermajor sixth [[12/7]] by a sensamagic comma [[245/243]]. | ||
Notice it is also sharp of the just major sixth [[5/3]] by a subminor second [[28/27]]. For this fact it is useful in the [[sensamagic dominant chord]] where it functions as a dissonance yet to be resolved down to the major sixth. The [[Canou family|canou temperament]] targets this progression and uses it as one of the generators. | |||
It is | == Approximation == | ||
It is perfectly approximated by [[19edo]] (15\19), with an error of 0.05 cents, and hence equally well done by the [[enneadecal]] temperament. | |||
== See also == | == See also == | ||
| Line 19: | Line 16: | ||
* [[Gallery of just intervals]] | * [[Gallery of just intervals]] | ||
[[Category:Seventh]] | [[Category:Seventh]] | ||
[[Category:Subminor seventh]] | [[Category:Subminor seventh]] | ||
[[Category:Interseptimal]] | [[Category:Interseptimal intervals]] | ||
[[Category:Semitwelfth]] | |||
Latest revision as of 03:27, 28 April 2023
| Interval information |
[sound info]
140/81, the septimal inframinor seventh is a 7-limit interseptimal ratio of about 947 cents. It is flat of a minor seventh 16/9 by a septimal quartertone 36/35, flat of a subminor seventh 7/4 by a syntonic comma 81/80, and sharp of a supermajor sixth 12/7 by a sensamagic comma 245/243.
Notice it is also sharp of the just major sixth 5/3 by a subminor second 28/27. For this fact it is useful in the sensamagic dominant chord where it functions as a dissonance yet to be resolved down to the major sixth. The canou temperament targets this progression and uses it as one of the generators.
Approximation
It is perfectly approximated by 19edo (15\19), with an error of 0.05 cents, and hence equally well done by the enneadecal temperament.