121/120: Difference between revisions
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| Name = biyatisma, <br> undecimal seconds comma | | Name = biyatisma, <br> undecimal seconds comma | ||
| Color name = | | Color name = | ||
| FJS name = d1<sup>11,11</sup><sub>5</sub> | |||
| Sound = | | Sound = | ||
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Revision as of 06:57, 28 December 2020
| Interval information |
undecimal seconds comma
reduced
In Just Intonation, 121/120, otherwise known as the biyatisma, or undecimal seconds comma, is a superparticular interval of around 14.4¢ which makes the difference between two undecimal neutral seconds of 11/10 and 12/11. Temperaments in which 121/120 is tempered out include 15, 22, 29, 31, 46, 53 EDOs and others; in such systems, 11/10 and 12/11 are equated. This is in contrast to the more familiar tempering out of 81/80, which results in meantone and other temperaments, in which 10/9 is equated with 9/8. Along with being the difference between 11/10 and 12/11, 121/120 is the difference between 11/8 and 15/11, so that tempering out 121/120 allows for the dyadic triad which has intervals of 11/8, 11/8, and 16/15 (Biyatismic chords).