Octave
From Xenharmonic Reference
(Redirected from 2/1)
| Interval information |
harmonic,
prime harmonic,
highly composite harmonic
The octave is the most consonant interval, with a ratio of 2/1 and a size of 1200 cents by definition. It is the most common interval of equivalence, as patterns of consonance often roughly repeat at octaves up or down. Additionally, most scales repeat at an octave or a logarithmic fraction thereof. The octave is also useful as a measure of logarithmic size of intervals.
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|---|---|
| Interval categories | |
| Diatonic ordinals | Unison • Second (major • neutral • minor) • Third (major • neutral • minor) • Fourth • Fifth • Sixth (major • neutral • minor) • Seventh (major • neutral • minor) • Octave |
| Other interval categories | Diesis • Semitone • Whole tone • Interordinal intervals (chthonic • naiadic • cocytic • ouranic) • Tritone |
| Just intonation | |
| Pythagorean | Perfect fifth • Perfect fourth • Diatonic major second • Diatonic minor seventh • Tritave • others |
| 5-limit | 5/4 • 5/3 • 6/5 • 16/15 • 25/24 • others |
| 7-limit | 7/4 • 8/7 • 7/6 • 9/7 • 7/5 • 49/48 • others |
| Alpharabian | 11/8 • 11/9 • 12/11 • others |
| Full 11-limit | 11/10 • 14/11 • 11/7 • others |
| 2.3.13/5 | 13/10 • 15/13 • 26/15 • 20/13 • others |
| Full 13-limit | 16/13 • 13/8 • 13/11 • 13/9 • 13/7 • others |
| Higher limits | 17/16 • 18/17 • 19/16 • 19/15 • 24/19 • 23/16 • others |
