8edf: Difference between revisions
Wikispaces>keenanpepper **Imported revision 288541940 - Original comment: ** |
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{{Infobox ET}} | |||
'''8 equal divisions of the fifth''' ('''8edf''', '''8ed3/2''') is the [[tuning system]] that divides the fifth into 8 steps of 87.7444 [[cent]]s each, making it very nearly [[88cET]]. It is related to the [[Octacot|octacot temperament]]. 8edf corresponds to about 13.6761edo (similar to every third step of [[41edo]]). | |||
== Intervals == | |||
8edf can be notated either using native uranian (sesquitave) notation, where the notation repeats every period (i.e. [[Just fifth|just diatonic fifth]]), or using double sesquitave (Annapolis) notation, where the notation repeats every two periods (i.e. [[9/4|major diatonic ninth]]). This interprets 8edf as [[16ed9/4]], resulting in a tuning for the Natural and Harmonic Minor modes of Annapolis[6L 4s]. It can also be notated using tetratonic [[4edf]]-based notation. | |||
The naturals result from a [[semiwolf]] generator (~[[7/6]]). For sesquitave notation, letters A-E can be used. For double sesquitave notation, Greek numerals 1-10 can be used (Α,Β,Γ,Δ,Ε,Ϛ/Ϝ,Ζ,Η,Θ,Ι). | |||
{| class="wikitable center-all left-1 left-2" | |||
!Scale | |||
!Cents | |||
! colspan="3" |Approximate intervals | |||
!Uranian | |||
!Diatonic | |||
! colspan="3" |Notation | |||
|- | |||
!degree | |||
!value | |||
!7-limit | |||
!11-limit | |||
!19-limit | |||
!interval | |||
!equivalent | |||
!Uranian | |||
!Annapolis | |||
!Tetratonic notation | |||
|- | |||
|'''0''' | |||
|'''0''' | |||
| colspan="3" |'''1''' | |||
| colspan="2" |'''unison''' | |||
|'''A''' | |||
|'''Α''' | |||
|C | |||
|- | |||
|1 | |||
|87.7444 | |||
|21/20 | |||
|22/21 | |||
|20/19, 19/18 | |||
|min mos2nd | |||
|minor second | |||
|A# | |||
|Α# | |||
|^C, vD | |||
|- | |||
|2 | |||
|175.48875 | |||
|10/9 | |||
| | |||
|21/19 | |||
|maj mos2nd | |||
|major second | |||
|B | |||
|Β | |||
|D | |||
|- | |||
|3 | |||
|263.2331 | |||
|''7/6'' | |||
| | |||
| | |||
|''perf mos3rd'' | |||
|subminor third | |||
|C | |||
|Γ | |||
|^D, vE | |||
|- | |||
|4 | |||
|350.9775 | |||
|60/49, 49/40 | |||
|11/9 | |||
| | |||
|aug mos3rd | |||
|neutral third | |||
|C# | |||
|Γ# | |||
|E | |||
|- | |||
|5 | |||
|438.7219 | |||
|''9/7'' | |||
| | |||
| | |||
|''perf mos4th'' | |||
|supermajor third | |||
|D | |||
|Δ | |||
|^E, vF | |||
|- | |||
|6 | |||
|526.46625 | |||
|27/20 | |||
| | |||
|19/14 | |||
|min mos5th | |||
|wolf fourth | |||
|D# | |||
|Δ# | |||
|F | |||
|- | |||
|7 | |||
|614.2106 | |||
|10/7 | |||
| | |||
|27/19 | |||
|maj mos5th | |||
|augmented fourth | |||
|E | |||
|Ε | |||
|^F, vC | |||
|- | |||
|'''8''' | |||
|'''701.955''' | |||
|'''3/2''' | |||
| | |||
| | |||
|'''sesquitave''' | |||
|'''just fifth''' | |||
|'''A''' | |||
|'''Ϛ/Ϝ''' | |||
|C | |||
|- | |||
|9 | |||
|789.6994 | |||
|63/40 | |||
|11/7 | |||
|30/19 | |||
|min mos7th | |||
|minor sixth | |||
|A# | |||
|Ϛ#/Ϝ# | |||
|^C, vD | |||
|- | |||
|10 | |||
|877.44375 | |||
|5/3 | |||
| | |||
|63/38 | |||
|maj mos7th | |||
|major sixth | |||
|B | |||
|Ζ | |||
|D | |||
|- | |||
|11 | |||
|965.1881 | |||
|''7/4'' | |||
| | |||
| | |||
|''perf mos8th'' | |||
|subminor seventh | |||
|C | |||
|Η | |||
|^D, vE | |||
|- | |||
|12 | |||
|1052.9325 | |||
|90/49, 35/18 | |||
|11/6 | |||
| | |||
|aug mos8th | |||
|neutral seventh | |||
|C# | |||
|Η# | |||
|E | |||
|- | |||
|13 | |||
|1140.6769 | |||
|''27/14'' | |||
| | |||
| | |||
|''perf mos9th'' | |||
|supermajor seventh | |||
|D | |||
|Θ | |||
|^E, vF | |||
|- | |||
|14 | |||
|1228.42125 | |||
|81/40 | |||
| | |||
|57/28 | |||
|min mos10th | |||
|acute octave | |||
|D# | |||
|Θ# | |||
|F | |||
|- | |||
|15 | |||
|1316.1656 | |||
|15/7 | |||
| | |||
|81/38 | |||
|maj mos10th | |||
|minor ninth | |||
|E | |||
|Ι | |||
|^F, vC | |||
|- | |||
|'''16''' | |||
|'''1403.91''' | |||
|'''9/4''' | |||
| | |||
| | |||
|'''double sesquitave''' | |||
|'''major ninth''' | |||
|'''A''' | |||
|'''Α''' | |||
|C | |||
|} | |||
[https://sevish.com/scaleworkshop/?name=8EDF%20Uranian&data=87.74437510817343%0A175.48875021634686%0A263.2331253245203%0A350.9775004326937%0A438.72187554086713%0A526.4662506490406%0A614.210625757214%0A701.9550008653874&freq=220&midi=57&vert=5&horiz=1&colors=white%20black%20white%20white%20black%20white%20black%20white&waveform=square&env=organ Scale workshop link for a keyboard/MIDI playable 8EDF (with graphical uranian scale, A=220Hz)] | |||
== Rank 2 temperaments == | |||
MOS scales and temperament listed by generator size and period: | |||
{| class="wikitable" | |||
|- | |||
! | Periods | |||
per octave | |||
! | Generator | |||
! | Scale pattern | |||
! | Temperaments | |||
|- | |||
| | 1 | |||
| | 1\8 | |||
| | 1L5s, 1L6s | |||
| | (pathological) | |||
|- | |||
| | 1 | |||
| | 3\8 | |||
| | [[3L 2s (fifth-equivalent)|3L2s (uranian)]] | |||
| | [[3L 2s (fifth-equivalent)#Temperaments|Semiwolf]] | |||
|- | |||
| | 2 | |||
| | 3\8 | |||
| | 2L 2s | |||
| | (augmented-like) | |||
|} | |||
== Music == | |||
* [https://m.youtube.com/watch?v=rzcuLiE3HhE Funny Snakecharmer] - [[Sven Karma]] (Dec 2023) - uses the [[Kartvelian scales#8edf Kartvelian tetradecatonic scale|8edf Kartvelian tetradecatonic scale]], alternating blocks of [[8edf]] and [[6ed4/3]] | |||
== Images == | |||
[[File:8EDF_cheat_sheet_circle.png|400px|thumb|left|8EDF cheat sheet (sesquitave notation) - [[Media:8EDF cheat sheet.pdf|table only]]]] | |||
[[Category:Nonoctave]] | |||
{{Todo| review }} | |||