5L 3s/Temperaments: Difference between revisions
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[[Oneirotonic]] temperaments have a sort of analogy to diatonic temperaments superpyth and meantone in how they treat the large step. In diatonic the large step approximates 9/8 (a very good 9/8 in 12edo), but superpyth has 9/8 ~ 8/7, and meantone has 9/8 ~ 10/9. In oneirotonic the large step tends to approximate 10/9 (and is a very good 10/9 in 13edo which is the oneirotonic analogue to 12edo), but different oneiro temperaments do different things with it. In A-Team (13&18), 10/9 is equated with 9/8, making the major oneirothird a 5/4 (thus is "meantone" in that sense). In both Petrtri (13&21) and Tridec (21&29), 10/9 is equated with 11/10, making the major oneirothird a 11/9; and the perfect oneirofourth is equated to 13/10. So the compressed major triad add2 ( | {{breadcrumb}} | ||
[[Oneirotonic]] temperaments have a sort of analogy to diatonic temperaments superpyth and meantone in how they treat the large step. In diatonic the large step approximates 9/8 (a very good 9/8 in 12edo), but [[superpyth]] has {{nowrap|9/8 ~ 8/7}}, and meantone has {{nowrap|9/8 ~ 10/9}}. In oneirotonic the large step tends to approximate 10/9 (and is a very good 10/9 in 13edo which is the oneirotonic analogue to 12edo), but different oneiro temperaments do different things with it. In A-Team ({{nowrap|13 & 18}}), 10/9 is equated with 9/8, making the major oneirothird a 5/4 (thus is "meantone" in that sense). In both Petrtri ({{nowrap|13 & 21}}) and Tridec ({{nowrap|21 & 29}}), 10/9 is equated with 11/10, making the major oneirothird a 11/9; and the perfect oneirofourth is equated to 13/10. So the compressed major triad add2 (R–M2–M3–M5, {{nowrap|M5 {{=}} major oneirofifth}} {{nowrap|{{=}} minor fifth in 13edo}}) is interpreted as 9:10:11:13 in petrtri, analogous to meantone's 8:9:10:12. Thus Petrtri and Tridec are the same temperament when you only care about the 9:10:11:13, or equivalently the 2.9/5.11/5.13/5 subgroup. This is one reason why Tridec can be viewed as the oneirotonic analogue of [[flattone]]—it's a flatter variant of the flat-of-13edo oneiro temperament on the 2.9/5.11/5.13/5 subgroup. | |||
Vulture/[[Hemifamity temperaments|Buzzard]], in which four generators make a 3/1 (and three generators approximate an octave plus 8/7), is the only [[harmonic entropy]] minimum in the oneirotonic range. However, the rest of this region is still rich in notable subgroup temperaments. | |||
== Petrtri == | == Petrtri == | ||
Subgroup: 2.11/5.13/5 | Subgroup: 2.11/5.13/5 | ||
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Mapping: [<1 0 1|, <0 3 1|] | Mapping: [<1 0 1|, <0 3 1|] | ||
EDOs: 21, 29, 153, 182, 211, 240, 269, 298, 327, 356, 385, 509, 741c, 1126c | EDOs: {{EDOs|21, 29, 153, 182, 211, 240, 269, 298, 327, 356, 385, 509, 741c, 1126c}} | ||
=== Tridec === | === Tridec === | ||
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Mapping generators: ~2, ~13/10 | Mapping generators: ~2, ~13/10 | ||
{{ | {{Optimal ET sequence|legend=1| 21, 29, 37 }} | ||
==== Intervals ==== | ==== Intervals ==== | ||
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! Size in POTE tuning | ! Size in POTE tuning | ||
! Note name on Q | ! Note name on Q | ||
! class="unsortable"| Approximate ratios | ! class="unsortable" | Approximate ratios | ||
! #Gens up | ! #Gens up | ||
|- | |- | ||
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Mapping generators: ~2, ~13/10 | Mapping generators: ~2, ~13/10 | ||
{{ | {{Optimal ET sequence|legend=1| 13, 21, 34 }} | ||
==== Intervals ==== | ==== Intervals ==== | ||
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! Size in POTE tuning | ! Size in POTE tuning | ||
! Note name on Q | ! Note name on Q | ||
! class="unsortable"| Approximate ratios | ! class="unsortable" | Approximate ratios | ||
! #Gens up | ! #Gens up | ||
|- | |- | ||
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Mapping generators: ~2, ~21/16 | Mapping generators: ~2, ~21/16 | ||
{{ | {{Optimal ET sequence|legend=1| 13, 18, 31, 44 }} | ||
=== Intervals === | === Intervals === | ||
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! Size in 31edo | ! Size in 31edo | ||
! Note name on Q | ! Note name on Q | ||
! class="unsortable"| Approximate ratios | ! class="unsortable" | Approximate ratios* | ||
! #Gens up | ! #Gens up | ||
|- | |- | ||
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| +5 | | +5 | ||
|} | |} | ||
< | <nowiki />* The ratio interpretations that are not valid for 18edo are italicized. | ||
== Buzzard == | == Buzzard == | ||
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Mapping generators: ~2, ~21/16 | Mapping generators: ~2, ~21/16 | ||
{{Optimal ET sequence|legend=1| 48, 53, 111, 164d, 275d}} | |||
Badness: 0.0480 | Badness: 0.0480 | ||
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! Size in POTE tuning | ! Size in POTE tuning | ||
! Note name on Q | ! Note name on Q | ||
! class="unsortable"| Approximate ratios | ! class="unsortable" | Approximate ratios | ||
! #Gens up | ! #Gens up | ||
|- | |- | ||