7afdo: Difference between revisions
CompactStar (talk | contribs) Created page with "'''7ado''' is the arithmetic equal division of the octave into seven parts of 1/7 each. As 7 is a small odd number, this ADO does not contain a perfect fifth or any re..." |
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''' | {{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 == | ||
| Line 6: | Line 7: | ||
! Cents | ! Cents | ||
! Ratio | ! Ratio | ||
! Decimal | |||
! Interval name | ! Interval name | ||
! Audio | ! Audio | ||
| Line 12: | Line 14: | ||
| 0 | | 0 | ||
| [[1/1]] | | [[1/1]] | ||
| 1.0000 | |||
| perfect unison | | perfect unison | ||
| | | | ||
| Line 18: | Line 21: | ||
| 231.2 | | 231.2 | ||
| [[8/7]] | | [[8/7]] | ||
| 1.1429 | |||
| supermajor second | | supermajor second | ||
| [[File:Jid_8_7_pluck_adu_dr220.mp3]] | | [[File:Jid_8_7_pluck_adu_dr220.mp3]] | ||
| Line 24: | Line 28: | ||
| 435.1 | | 435.1 | ||
| [[9/7]] | | [[9/7]] | ||
| 1.2857 | |||
| supermajor third | | supermajor third | ||
| [[File:Jid_9_7_pluck_adu_dr220.mp3]] | | [[File:Jid_9_7_pluck_adu_dr220.mp3]] | ||
| Line 30: | Line 35: | ||
| 617.5 | | 617.5 | ||
| [[10/7]] | | [[10/7]] | ||
| 1.4286 | |||
| high tritone | | high tritone | ||
| [[File:Jid_10_7_pluck_adu_dr220.mp3]] | | [[File:Jid_10_7_pluck_adu_dr220.mp3]] | ||
| Line 36: | Line 42: | ||
| 782.4 | | 782.4 | ||
| [[11/7]] | | [[11/7]] | ||
| 1.5714 | |||
| undecimal minor sixth | | undecimal minor sixth | ||
| [[File:Jid_11_7_pluck_adu_dr220.mp3]] | | [[File:Jid_11_7_pluck_adu_dr220.mp3]] | ||
| Line 42: | Line 49: | ||
| 933.1 | | 933.1 | ||
| [[12/7]] | | [[12/7]] | ||
| 1.7143 | |||
| supermajor sixth | | supermajor sixth | ||
| [[File:Jid_12_7_pluck_adu_dr220.mp3]] | | [[File:Jid_12_7_pluck_adu_dr220.mp3]] | ||
| Line 47: | Line 55: | ||
| 6 | | 6 | ||
| 1071.7 | | 1071.7 | ||
| [[13/7]] | |||
| 1.8571 | |||
| tridecimal submajor seventh | | tridecimal submajor seventh | ||
| [[File: | | [[File:Jid_13_7_pluck_adu_dr220.mp3]] | ||
|- | |- | ||
| 7 | | 7 | ||
| 1200.0 | | 1200.0 | ||
| [[2/1]] | | [[2/1]] | ||
| 2.0000 | |||
| perfect octave | | perfect octave | ||
| [[File:Jid_2_1_pluck_adu_dr220.mp3]] | | [[File:Jid_2_1_pluck_adu_dr220.mp3]] | ||
|} | |} | ||
[[ | == Scala files == | ||
* [[Harmd-mix]] | |||
* [[Oheptad]] – same, but starts with 8/7 | |||