18/13: Difference between revisions
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{{Infobox Interval | {{Infobox Interval | ||
| Name = tridecimal augmented fourth, low tritone | |||
| Name = tridecimal augmented fourth, | |||
| Color name = 3u4, thu 4th | | Color name = 3u4, thu 4th | ||
| Sound = jid_18_13_pluck_adu_dr220.mp3 | | Sound = jid_18_13_pluck_adu_dr220.mp3 | ||
}} | }} | ||
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* [[Gallery of just intervals]] | * [[Gallery of just intervals]] | ||
[[Category:Tritone]] | [[Category:Tritone]] | ||
Latest revision as of 12:35, 25 October 2022
| Interval information |
low tritone
[sound info]
In 13-limit just intonation, 18/13, the tridecimal augmented fourth is a low tritone measuring about 563.4¢. It represents the interval between the 13th and 18th harmonics of the harmonic series.
The low tritone in 17edo approximates 18/13 quite well, while 17edo's approximations of 13/8 and 9/8 are both a little sharp. The inversion of 18/13 is 13/9, a high tritone measuring about 636.6¢; the interval between these two tridecimal (13-based) tritones is 169/162, approximately 73.2¢.