Hemimean family: Difference between revisions
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{{Technical data page}} | {{Technical data page}} | ||
The '''hemimean family''' of | The '''hemimean family''' of [[rank-3 temperament]]s [[tempering out|tempers out]] 3136/3125, the [[hemimean comma]]. | ||
The hemimean comma | The hemimean comma is the difference between the [[126/125|septimal semicomma (126/125)]] and the [[225/224|septimal kleisma (225/224)]]. This fact alone makes hemimean a very notable rank-3 temperament, as any non-meantone tuning of hemimean will split the [[81/80|syntonic comma (81/80)]] into two equal parts, each representing 126/125~225/224. | ||
Other equivalences characteristic to hemimean are [[128/125]]~[[50/49]] and [[49/45]]~([[25/24]])<sup>2</sup>. | Other equivalences characteristic to hemimean are [[128/125]]~[[50/49]] and [[49/45]]~([[25/24]])<sup>2</sup>. | ||
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{{Mapping|legend=1| 1 0 0 -3 | 0 1 0 0 | 0 0 2 5 }} | {{Mapping|legend=1| 1 0 0 -3 | 0 1 0 0 | 0 0 2 5 }} | ||
: Mapping generators: ~2, ~3, ~56/25 | : Mapping generators: ~2, ~3, ~56/25 | ||
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[[Optimal tuning]]s: | [[Optimal tuning]]s: | ||
* [[ | * [[WE]]: ~2 = 1199.8194{{c}}, ~3/2 = 702.1353{{c}}, ~28/25 = 193.7425{{c}} | ||
* [[CWE]]: ~2 = 1200. | : [[error map]]: {{val| -0.181 -0.000 +0.810 -0.474 }} | ||
* [[CWE]]: ~2 = 1200.000{{c}}, ~3/2 = 702.1118{{c}}, ~28/25 = 193.7167{{c}} | |||
: error map: {{val| 0.000 +0.157 +1.120 -0.243 }} | |||
[[Minimax tuning]]: | [[Minimax tuning]]: | ||
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[[Complexity spectrum]]: 5/4, 7/5, 4/3, 6/5, 8/7, 7/6, 9/8, 10/9, 9/7 | [[Complexity spectrum]]: 5/4, 7/5, 4/3, 6/5, 8/7, 7/6, 9/8, 10/9, 9/7 | ||
[[Projection pair]]s: 5 3136/625, 7 68841472/9765625 | [[Projection pair]]s: <code>5 3136/625, 7 68841472/9765625</code> to 2.3.25/7 | ||
== Belobog == | == Belobog == | ||
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{{Mapping|legend=1| 1 0 0 -3 -9 | 0 1 0 0 2 | 0 0 2 5 8 }} | {{Mapping|legend=1| 1 0 0 -3 -9 | 0 1 0 0 2 | 0 0 2 5 8 }} | ||
: Mapping generators: ~2, ~3, ~56/25 | : Mapping generators: ~2, ~3, ~56/25 | ||
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[[Optimal tuning]]s: | [[Optimal tuning]]s: | ||
* [[ | * [[WE]]: ~2 = 1200.0098{{c}}, ~3/2 = 701.7170{{c}}, ~28/25 = 193.5520{{c}} | ||
* [[CWE]]: ~2 = 1200. | : [[error map]]: {{val| +0.010 -0.228 +0.810 -1.046 +0.542 }} | ||
* [[CWE]]: ~2 = 1200.0000{{c}}, ~3/2 = 701.7144{{c}}, ~28/25 = 193.5518{{c}} | |||
: error map: {{val| 0.000 -0.241 +0.790 -1.067 +0.525 }} | |||
[[Minimax tuning]]: | [[Minimax tuning]]: | ||
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Optimal tunings: | Optimal tunings: | ||
* | * WE: ~2 = 1199.9154{{c}}, ~3/2 = 701.7875{{c}}, ~28/25 = 193.5853{{c}} | ||
* CWE: ~2 = 1200. | * CWE: ~2 = 1200.0000{{c}}, ~3/2 = 701.8346{{c}}, ~28/25 = 193.5962{{c}} | ||
{{Optimal ET sequence|legend=0| 31, 43, 56, 74, 87, 118, 130, 217, 248, 347e, 378, 465, 595e }} | {{Optimal ET sequence|legend=0| 31, 43, 56, 74, 87, 118, 130, 217, 248, 347e, 378, 465, 595e }} | ||
Badness (Sintel): 1. | Badness (Sintel): 1.03 | ||
=== Bellowblog === | === Bellowblog === | ||
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Optimal tunings: | Optimal tunings: | ||
* | * WE: ~2 = 1200.000{{c}}, ~3/2 = 702.5857{{c}}, ~28/25 = 193.2930{{c}} | ||
* CWE: ~2 = 1200. | * CWE: ~2 = 1200.000{{c}}, ~3/2 = 702.6342{{c}}, ~28/25 = 193.2932{{c}} | ||
{{Optimal ET sequence|legend=0| 12f, 19e, 31, 56, 68e, 87, 118, 186ef, 205d }} | {{Optimal ET sequence|legend=0| 12f, 19e, 31, 56, 68e, 87, 118, 186ef, 205d }} | ||
Badness (Sintel): 1. | Badness (Sintel): 1.18 | ||
== Siebog == | == Siebog == | ||
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{{Mapping|legend=1| 1 0 0 -3 8 | 0 1 0 0 3 | 0 0 2 5 -8 }} | {{Mapping|legend=1| 1 0 0 -3 8 | 0 1 0 0 3 | 0 0 2 5 -8 }} | ||
: Mapping generators: ~2, ~3, ~56/25 | : Mapping generators: ~2, ~3, ~56/25 | ||
[[Optimal tuning]]s: | [[Optimal tuning]]s: | ||
* [[ | * [[WE]]: ~2 = 1199.5790{{c}}, ~3/2 = 701.8397{{c}}, ~28/25 = 194.0111{{c}} | ||
* [[CWE]]: ~2 = 1200. | : [[error map]]: {{val| -0.421 -0.536 +0.867 +0.388 +0.849 }} | ||
* [[CWE]]: ~2 = 1200.0000{{c}}, ~3/2 = 701.7235{{c}}, ~28/25 = 193.9948{{c}} | |||
: error map: {{val| 0.000 -0.232 +1.676 +1.148 +1.894 }} | |||
[[Minimax tuning]]: | [[Minimax tuning]]: | ||
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{{Optimal ET sequence|legend=1| 12e, 18e, 19, 31, 68e, 80, 99e, 130, 210e, 241, 340ce, 371ce, 470cdee, 501cde, 581cdee, 711ccdee }} | {{Optimal ET sequence|legend=1| 12e, 18e, 19, 31, 68e, 80, 99e, 130, 210e, 241, 340ce, 371ce, 470cdee, 501cde, 581cdee, 711ccdee }} | ||
[[Badness]] (Sintel): 1. | [[Badness]] (Sintel): 1.05 | ||
== Triglav == | == Triglav == | ||
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[[Comma list]]: 3025/3024, 3136/3125 | [[Comma list]]: 3025/3024, 3136/3125 | ||
{{Mapping|legend=1| 1 0 2 | {{Mapping|legend=1| 1 0 -2 -8 0 | 0 1 2 5 2 | 0 0 4 10 1 }} | ||
: Mapping generators: ~2, ~3, ~11/9 | |||
: Mapping generators: ~2, ~3, ~ | |||
[[Optimal tuning]]s: | [[Optimal tuning]]s: | ||
* [[ | * [[WE]]: ~2 = 1199.8764{{c}}, ~3/2 = 702.4302{{c}}, ~11/9 = 345.5856{{c}} | ||
* [[CWE]]: ~2 = 1200. | : [[error map]]: {{val| -0.124 +0.352 +0.889 -0.448 -1.119 }} | ||
* [[CWE]]: ~2 = 1200.0000{{c}}, ~3/2 = 702.4067{{c}}, ~11/9 = 345.6505{{c}} | |||
: error map: {{val| 0.000 +0.452 +1.102 -0.288 -0.854 }} | |||
{{Optimal ET sequence|legend=1| 24d, 31, 80, 87, 111, 118, 198, 316, 514c, 545c }} | {{Optimal ET sequence|legend=1| 24d, 31, 80, 87, 111, 118, 198, 316, 514c, 545c }} | ||
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Comma list: 352/351, 1001/1000, 3025/3024 | Comma list: 352/351, 1001/1000, 3025/3024 | ||
Mapping: {{Mapping| 1 0 2 | Mapping: {{Mapping| 1 0 -2 -8 0 5 | 0 1 2 5 2 -1 | 0 0 4 10 1 1 }} | ||
Optimal tunings: | Optimal tunings: | ||
* | * WE: ~2 = 1199.6554{{c}}, ~3/2 = 702.8049{{c}}, ~11/9 = 345.3412{{c}} | ||
* CWE: ~2 = 1200. | * CWE: ~2 = 1200.0000{{c}}, ~3/2 = 702.9366{{c}}, ~11/9 = 345.4458{{c}} | ||
{{Optimal ET sequence|legend=0| 24d, 31, 80, 87, 111, 118, 198 }} | {{Optimal ET sequence|legend=0| 24d, 31, 56, 80, 87, 111, 118, 167, 198 }} | ||
Badness (Sintel): 1. | Badness (Sintel): 1.16 | ||
== Semihemimean == | == Semihemimean == | ||
Named by [[Xenllium]] in 2026, semihemimean tempers out [[9801/9800]] and splits the octave in halves. | |||
[[Subgroup]]: 2.3.5.7.11 | [[Subgroup]]: 2.3.5.7.11 | ||
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{{Mapping|legend=1| 2 0 0 -6 -3 | 0 1 0 0 -2 | 0 0 2 5 7 }} | {{Mapping|legend=1| 2 0 0 -6 -3 | 0 1 0 0 -2 | 0 0 2 5 7 }} | ||
: Mapping generators: ~99/70, ~3, ~56/25 | : Mapping generators: ~99/70, ~3, ~56/25 | ||
[[Optimal tuning]]s: | [[Optimal tuning]]s: | ||
* [[ | * [[WE]]: ~99/70 = 599.9102{{c}}, ~3/2 = 702.1314{{c}}, ~28/25 = 193.7431{{c}} | ||
* [[CWE]]: ~99/70 = 600. | : [[error map]]: {{val| -0.180 -0.003 +0.813 -0.470 -0.008 }} | ||
* [[CWE]]: ~99/70 = 600.0000{{c}}, ~3/2 = 702.1353{{c}}, ~28/25 = 193.7122{{c}} | |||
: error map: {{val| 0.000 +0.180 +1.111 -0.265 +0.397 }} | |||
{{Optimal ET sequence|legend=1| 12, 50, 68, 80, 118, 130, 198 }} | {{Optimal ET sequence|legend=1| 12, …, 38d, 50, 68, 80, 118, 130, 198, 248, 328, 446, 774c }} | ||
[[Badness]] (Sintel): 1. | [[Badness]] (Sintel): 1.79 | ||
=== 13-limit === | === 13-limit === | ||
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Optimal tunings: | Optimal tunings: | ||
* | * WE: ~99/70 = 599.8791{{c}}, ~3/2 = 702.1476{{c}}, ~28/25 = 193.7877{{c}} | ||
* CWE: ~99/70 = 600. | * CWE: ~99/70 = 600.0000{{c}}, ~3/2 = 702.1740{{c}}, ~28/25 = 193.7869{{c}} | ||
{{Optimal ET sequence|legend=0| 12, 50, 68, 80, 118, 130, 198 }} | {{Optimal ET sequence|legend=0| 12, …, 50, 68, 80, 118, 130, 198, 328, 576cf, 774cf, 904cef }} | ||
Badness (Sintel): 1.55 | |||
=== 17-limit === | === 17-limit === | ||
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Optimal tunings: | Optimal tunings: | ||
* | * WE: ~17/12 = 599.9481{{c}}, ~3/2 = 702.2594{{c}}, ~28/25 = 193.7763{{c}} | ||
* CWE: ~17/12 = 600. | * CWE: ~17/12 = 600.0000{{c}}, ~3/2 = 702.2692{{c}}, ~28/25 = 193.7762{{c}} | ||
{{Optimal ET sequence|legend=0| 12, 50, 68, 80, 118, 130, 198 }} | {{Optimal ET sequence|legend=0| 12, …, 50, 68, 80, 118, 130, 198 }} | ||
Badness (Sintel): 1.74 | |||
=== 19-limit === | === 19-limit === | ||
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Optimal tunings: | Optimal tunings: | ||
* | * WE: ~17/12 = 599.9687{{c}}, ~3/2 = 702.3501{{c}}, ~19/17 = 193.7922{{c}} | ||
* CWE: ~17/12 = 600. | * CWE: ~17/12 = 600.0000{{c}}, ~3/2 = 702.3549{{c}}, ~19/17 = 193.7919{{c}} | ||
{{Optimal ET sequence|legend=0| 12, …, 50, 68, 80, 118, 130, 198 }} | |||
Badness (Sintel): 1.32 | |||
== Subgroup extensions == | |||
=== Hemimean orion (2.3.5.7.17) === | |||
As the second generator of hemimean, [[28/25]], is close to [[19/17]], and as the latter is the [[mediant]] of [[10/9]] and [[9/8]], it is natural to extend hemimean to the 2.3.5.7.17.19 subgroup by tempering out their difference [[476/475]], or equivalently stated, the [[semiparticular]] (5/4)/(19/17)<sup>2</sup> = [[1445/1444]]. Notice 3136/3125 = (476/475)⋅([[2128/2125]]) and that 2128/2125 = ([[1216/1215]])⋅([[1701/1700]]), so it makes sense to temper out 1216/1215 and/or 1701/1700 as well. An interesting tuning not in the optimal ET sequence is [[111edo]]. This temperament finds the harmonic 17 and 19 at (+5, +1) and (+5, +2), respectively, with virtually no additional error. | |||
The [[S-expression]]-based comma list for the 2.3.5.7.17.19-subgroup extension is {[[1216/1215|S16/S18]], [[1445/1444|S17/S19]], [[1701/1700|S18/S20]](, ([[136/135|S16⋅S17]])/([[190/189|S19⋅S20]]) = [[476/475|(S16/S18)⋅(S17/S19)⋅(S18/S20)]])}. | |||
Subgroup: 2.3.5.7.17 | |||
Comma list: 1701/1700, 3136/3125 | |||
Subgroup-val mapping: {{mapping| 1 0 0 -3 -5 | 0 1 0 0 5 | 0 0 2 5 1 }} | |||
Optimal tunings: | |||
* WE: ~2 = 1199.7919{{c}}, ~3/2 = 702.2561{{c}}, ~28/25 = 193.7586{{c}} | |||
* CWE: ~2 = 1200.0000{{c}}, ~3/2 = 702.3042{{c}}, ~28/25 = 193.7365{{c}} | |||
{{Optimal ET sequence|legend=0| 12, 19g, 31g, …, 87, 99, 217, 229, 316, 328, 446, 545c, 873cg }} | |||
Badness (Sintel): 0.884 | |||
==== 2.3.5.7.17.19 subgroup ==== | |||
Subgroup: 2.3.5.7.17.19 | |||
Comma list: 476/475, 1216/1215, 1445/1444 | |||
Subgroup-val mapping: {{mapping| 1 0 0 -3 -5 -6 | 0 1 0 0 5 5 | 0 0 2 5 1 2 }} | |||
Optimal tunings: | |||
* WE: ~2 = 1199.8239{{c}}, ~3/2 = 702.1623{{c}}, ~19/17 = 193.7325{{c}} | |||
* CWE: ~2 = 1200.0000{{c}}, ~3/2 = 702.2129{{c}}, ~19/17 = 193.7161{{c}} | |||
{{Optimal ET sequence|legend=0| 12, 19gh, 31gh, …, 87, 99, 118, 210gh, 217, 229, 328h, 446 }} | |||
Badness (Sintel): 0.578 | |||
=== Semiorion (2.3.5.7.17) === | |||
Semiorion is an alternative subgroup extension of lower complexity, which splits the octave into two. The [[S-expression]]-based comma list for the 2.3.5.7.17.19 subgroup extension is {[[289/288|S17]], [[361/360|S19]], [[1216/1215|S16/S18]], ([[1701/1700|S18/S20]], [[476/475]] = [[2128/2125|S16/S20]]⋅[[1445/1444|S17/S19]])}. | |||
Subgroup: 2.3.5.7.17 | |||
Comma list: 289/288, 3136/3125 | |||
Subgroup-val mapping: {{mapping| 2 0 0 -6 5 | 0 1 0 0 1 | 0 0 2 5 0 }} | |||
: mapping generators: ~17/12, ~3, ~56/25 | |||
Optimal tunings: | |||
* WE: ~17/12 = 600.0551{{c}}, ~3/2 = 702.1998{{c}}, ~28/25 = 193.5929{{c}} | |||
* CWE: ~17/12 = 600.0000{{c}}, ~3/2 = 702.2183{{c}}, ~28/25 = 193.6044{{c}} | |||
{{Optimal ET sequence|legend=0| 12, 50, 68, | {{Optimal ET sequence|legend=0| 12, 30d, 38d, 50, 62, 68, 106d, 118, 248g, 316g }} | ||
Badness (Sintel): 1.69 | |||
==== 2.3.5.7.17.19 subgroup ==== | |||
Subgroup: 2.3.5.7.17.19 | |||
Comma list: 289/288, 361/360, 476/475 | |||
Mapping: {{mapping| 2 0 0 -6 5 3 | 0 1 0 0 1 1 | 0 0 2 5 0 1 }} | |||
Optimal tunings: | |||
* WE: ~17/12 = 600.0873{{c}}, ~3/2 = 702.2450{{c}}, ~19/17 = 193.5751{{c}} | |||
* CWE: ~17/12 = 600.0000{{c}}, ~3/2 = 702.2791{{c}}, ~19/17 = 193.5923{{c}} | |||
{{Optimal ET sequence|legend=0| 12, 30dh, 38d, 50, 68, 106d, 118, 248g, 316g }} | |||
Badness (Sintel): 0.722 | |||
[[Category:Hemimean family| ]] <!-- main article --> | |||
[[Category:Temperament families]] | [[Category:Temperament families]] | ||
[[Category: | [[Category:Catalogs of rank-3 temperaments]] | ||