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="3" | JI approximation
! colspan="4" | JI approximation
!Other
!Other
|-
|-
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! 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]
|-
|-
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| 1/1
| 1/1
| 1/1
| 1/1
|1/1
|1/1, 16/15
|1/1, 16/15
|-
|-
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| 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
|-
|-
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| 6/5
| 6/5
| 6/5
| 6/5
|13/11, 6/5
|6/5, 9/8
|6/5, 9/8
|-
|-
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| 13/10
| 13/10
| 13/10
| 13/10
|9/7, 13/10
|4/3, 5/4
|4/3, 5/4
|-
|-
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|  
|  
| 7/5, 10/7
| 7/5, 10/7
|7/5, 10/7
|27/20, 25/18, 36/25
|27/20, 25/18, 36/25
|-
|-
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| 20/13
| 20/13
| 20/13
| 20/13
|14/9
|3/2, 8/5
|3/2, 8/5
|-
|-
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| 5/3
| 5/3
| 5/3
| 5/3
|5/3
|5/3, 16/9
|5/3, 16/9
|-
|-
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| 11/6
| 11/6
| 20/11, 11/6
| 20/11, 11/6
|11/6, 13/7
|9/5, 48/50
|9/5, 48/50
|-
|-
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| 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 ==
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=== 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 {{nowrap| 3 & 5 }}. In terms of multi-period temperaments, it makes for a near perfect [[walid]] or a much less accurate [[diminished (temperament)|diminished]] scale.
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 ==