17/12: Difference between revisions
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{{Infobox Interval | {{Infobox Interval | ||
| Name = larger septendecimal tritone | | Name = larger septendecimal tritone | ||
| Color name = | | Color name = 17o5, iso 5th | ||
| Sound = jid_17_12_pluck_adu_dr220.mp3 | | Sound = jid_17_12_pluck_adu_dr220.mp3 | ||
}} | }} | ||
In [[17-limit]] [[just intonation]], '''17/12''' is the ''' | In [[17-limit]] [[just intonation]], '''17/12''' is the '''large septendecimal tritone''', measuring very nearly 603¢. Its inversion is the smaller septendecimal tritone, [[24/17]], and the interval that separates them is the small [[comma]] [[289/288]], about 6¢. This difference is usually negligible, and tempering out this comma allows the 600¢ half-octave to function as both septendecimal tritones. Thus, every even-numbered [[edo]] system contains a close approximation to these intervals. | ||
17/12 is the [[mediant]] between the two septimal tritones [[7/5]] and [[10/7]]. | 17/12 is the [[mediant]] between the two septimal tritones [[7/5]] and [[10/7]]. | ||
== Terminology and notation == | |||
Conceptualization systems disagree on whether [[17/16]] should be a [[diatonic semitone]] or a [[chromatic semitone]], and as a result the disagreement propagates to all intervals of [[harmonic class|HC17]]. See [[17-limit]] for a detailed discussion. | |||
For 17/12 specifically: | |||
* In [[Functional Just System]], it is a diminished fifth, separated by [[4131/4096]] from the [[1024/729|Pythagorean diminished fifth (1024/729)]]. | |||
* In [[Helmholtz-Ellis notation]], it is an augmented fourth, separated by [[2187/2176]] from the [[729/512|Pythagorean augmented fourth (729/512)]]. | |||
The term ''large septendecimal tritone'' omits the distinction and only describes its melodic property i.e. the size. It is said in contrast to the small septendecimal tritone of 24/17. | |||
== See also == | == See also == | ||
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* [[Gallery of just intervals]] | * [[Gallery of just intervals]] | ||
[[Category:Tritone]] | [[Category:Tritone]] | ||