7afdo: Difference between revisions
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{{Infobox | {{Infobox AFDO|steps=7}} | ||
''' | '''7afdo''' ([[AFDO|arithmetic frequency division of the octave]]), or '''7odo''' ([[otonal division]] of the octave), divides the octave into seven parts of 1/7 each. It is a superset of [[6afdo]] and a subset of [[8afdo]]. As a scale it may be known as [[Harmonic mode|mode 7 of the harmonic series]] or the [[Overtone scale#Over-7 scales|Over-7]] scale. As 7 is a small odd number, 7afdo does not contain a perfect fifth or any reasonable approximation to one in its root position. This makes 7afdo relatively poor for its size at creating traditional tonal music unless rotated. | ||
== Intervals == | == Intervals == | ||
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[[ | == Scala files == | ||
* [[Harmd-mix]] | |||
* [[Oheptad]] – same, but starts with 8/7 | |||
Latest revision as of 11:08, 23 February 2025
| ← 6afdo | 7afdo | 8afdo → |
7afdo (arithmetic frequency division of the octave), or 7odo (otonal division of the octave), divides the octave into seven parts of 1/7 each. It is a superset of 6afdo and a subset of 8afdo. As a scale it may be known as mode 7 of the harmonic series or the Over-7 scale. As 7 is a small odd number, 7afdo does not contain a perfect fifth or any reasonable approximation to one in its root position. This makes 7afdo relatively poor for its size at creating traditional tonal music unless rotated.
Intervals
| # | Cents | Ratio | Decimal | Interval name | Audio |
|---|---|---|---|---|---|
| 0 | 0 | 1/1 | 1.0000 | perfect unison | |
| 1 | 231.2 | 8/7 | 1.1429 | supermajor second | |
| 2 | 435.1 | 9/7 | 1.2857 | supermajor third | |
| 3 | 617.5 | 10/7 | 1.4286 | high tritone | |
| 4 | 782.4 | 11/7 | 1.5714 | undecimal minor sixth | |
| 5 | 933.1 | 12/7 | 1.7143 | supermajor sixth | |
| 6 | 1071.7 | 13/7 | 1.8571 | tridecimal submajor seventh | |
| 7 | 1200.0 | 2/1 | 2.0000 | perfect octave |