8edo: Difference between revisions
→Music: Add Bryan Deister's ''microtonal improvisation in 8edo'' (2024) |
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! rowspan="2" | Steps | ! rowspan="2" | Steps | ||
! rowspan="2" | Cents | ! rowspan="2" | Cents | ||
! colspan=" | ! colspan="4" | JI approximation | ||
!Other | !Other | ||
|- | |- | ||
| Line 41: | Line 41: | ||
! 2.5/3.11/3.13/5* | ! 2.5/3.11/3.13/5* | ||
! 10:11:12:13:14* | ! 10:11:12:13:14* | ||
!val 8d** | |||
!Patent val ⟨8 13 19] | !Patent val ⟨8 13 19] | ||
|- | |- | ||
| Line 48: | Line 49: | ||
| 1/1 | | 1/1 | ||
| 1/1 | | 1/1 | ||
|1/1 | |||
|1/1, 16/15 | |1/1, 16/15 | ||
|- | |- | ||
| Line 55: | Line 57: | ||
| 12/11 | | 12/11 | ||
| 12/11, 11/10 | | 12/11, 11/10 | ||
|14/13, 13/12, 12/11, 11/10 | |||
|10/9, 25/24 | |10/9, 25/24 | ||
|- | |- | ||
| Line 62: | Line 65: | ||
| 6/5 | | 6/5 | ||
| 6/5 | | 6/5 | ||
|13/11, 6/5 | |||
|6/5, 9/8 | |6/5, 9/8 | ||
|- | |- | ||
| Line 69: | Line 73: | ||
| 13/10 | | 13/10 | ||
| 13/10 | | 13/10 | ||
|9/7, 13/10 | |||
|4/3, 5/4 | |4/3, 5/4 | ||
|- | |- | ||
| Line 76: | Line 81: | ||
| | | | ||
| 7/5, 10/7 | | 7/5, 10/7 | ||
|7/5, 10/7 | |||
|27/20, 25/18, 36/25 | |27/20, 25/18, 36/25 | ||
|- | |- | ||
| Line 83: | Line 89: | ||
| 20/13 | | 20/13 | ||
| 20/13 | | 20/13 | ||
|14/9 | |||
|3/2, 8/5 | |3/2, 8/5 | ||
|- | |- | ||
| Line 90: | Line 97: | ||
| 5/3 | | 5/3 | ||
| 5/3 | | 5/3 | ||
|5/3 | |||
|5/3, 16/9 | |5/3, 16/9 | ||
|- | |- | ||
| Line 97: | Line 105: | ||
| 11/6 | | 11/6 | ||
| 20/11, 11/6 | | 20/11, 11/6 | ||
|11/6, 13/7 | |||
|9/5, 48/50 | |9/5, 48/50 | ||
|- | |- | ||
| Line 104: | Line 113: | ||
| 2/1 | | 2/1 | ||
| 2/1 | | 2/1 | ||
|2/1 | |||
|2/1, 15/8 | |2/1, 15/8 | ||
|} | |} | ||
<nowiki />* Allows [[inversion]] by 2/1; other interpretations also possible | <nowiki />* Allows [[inversion]] by 2/1; other interpretations also possible | ||
<nowiki />** 16 integer limit, relative error < 15 % | |||
== Notation == | == Notation == | ||
| Line 527: | Line 539: | ||
=== Temperaments === | === Temperaments === | ||
8edo is fairly composite, so the only step that generates a [[mos]] scale that covers every interval other than the 1 is the 3, producing scales of 332 and [[3L 2s|21212]]. In terms of temperaments, in the 5-limit this is best interpreted as [[father]], as 8edo is the highest edo that tempers out the diatonic semitone in it's [[patent val]], merging 5/4 and 4/3 into a single interval, which is also the generator. This means major and minor chords are rotations of each other, making them inaccurate but very simple, with even the 5 note mos having 3 of both and providing a functional skeleton of 5-limit harmony, albeit with some very strange enharmonic equivalences. In terms of 7-limit extensions things get even more inaccurate, as the patent val supports [[mother]], but the ideal tuning for that is much closer to [[5edo]]. The 8d val supports septimal father and [[pater]], and is much closer to the ideal tuning for both, as the extremely sharp 7 works better with the | 8edo is fairly composite, so the only step that generates a [[mos]] scale that covers every interval other than the 1 is the 3, producing scales of 332 and [[3L 2s|21212]]. In terms of temperaments, in the 5-limit this is best interpreted as [[father]], as 8edo is the highest edo that tempers out the diatonic semitone in it's [[patent val]], merging 5/4 and 4/3 into a single interval, which is also the generator. This means major and minor chords are rotations of each other, making them inaccurate but very simple, with even the 5 note mos having 3 of both and providing a functional skeleton of 5-limit harmony, albeit with some very strange enharmonic equivalences. In terms of 7-limit extensions things get even more inaccurate, as the patent val supports [[mother]], but the ideal tuning for that is much closer to [[5edo]]. The 8d val supports septimal father and [[pater]], and is much closer to the ideal tuning for both, as the extremely sharp 7 works better with the 3 and 5. In terms of multi-period temperaments, it makes for a near perfect [[walid]] or a much less accurate [[diminished (temperament)|diminished]] scale. | ||
== Instruments == | == Instruments == | ||