Hemimean family: Difference between revisions

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[[Optimal tuning]]s:  
[[Optimal tuning]]s:  
* [[CTE]]: ~2 = 1200.000{{c}}, ~3/2 = 701.955{{c}}, ~28/25 = 193.650{{c}}
* [[WE]]: ~2 = 1199.8194{{c}}, ~3/2 = 702.1353{{c}}, ~28/25 = 193.7425{{c}}
* [[CWE]]: ~2 = 1200.000{{c}}, ~3/2 = 702.112{{c}}, ~28/25 = 193.717{{c}}
: [[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]]:  
Line 52: Line 54:


[[Optimal tuning]]s:  
[[Optimal tuning]]s:  
* [[CTE]]: ~2 = 1200.000{{c}}, ~3/2 = 701.720{{c}}, ~28/25 = 193.554{{c}}
* [[WE]]: ~2 = 1200.0098{{c}}, ~3/2 = 701.7170{{c}}, ~28/25 = 193.5520{{c}}
* [[CWE]]: ~2 = 1200.000{{c}}, ~3/2 = 701.714{{c}}, ~28/25 = 193.552{{c}}
: [[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]]:  
Line 76: Line 80:


Optimal tunings:  
Optimal tunings:  
* CTE: ~2 = 1200.000{{c}}, ~3/2 = 701.822{{c}}, ~28/25 = 193.582{{c}}
* WE: ~2 = 1199.9154{{c}}, ~3/2 = 701.7875{{c}}, ~28/25 = 193.5853{{c}}
* CWE: ~2 = 1200.000{{c}}, ~3/2 = 701.835{{c}}, ~28/25 = 193.596{{c}}
* 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): 1.034
Badness (Sintel): 1.03


=== Bellowblog ===
=== Bellowblog ===
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Optimal tunings:  
Optimal tunings:  
* CTE: ~2 = 1200.000{{c}}, ~3/2 = 702.567{{c}}, ~28/25 = 193.249{{c}}
* WE: ~2 = 1200.000{{c}}, ~3/2 = 702.5857{{c}}, ~28/25 = 193.2930{{c}}
* CWE: ~2 = 1200.000{{c}}, ~3/2 = 702.634{{c}}, ~28/25 = 193.293{{c}}
* 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): 1.183
Badness (Sintel): 1.18


== Siebog ==
== Siebog ==
Line 107: Line 111:


[[Optimal tuning]]s:  
[[Optimal tuning]]s:  
* [[CTE]]: ~2 = 1200.000{{c}}, ~3/2 = 701.164{{c}}, ~28/25 = 193.865{{c}}
* [[WE]]: ~2 = 1199.5790{{c}}, ~3/2 = 701.8397{{c}}, ~28/25 = 194.0111{{c}}
* [[CWE]]: ~2 = 1200.000{{c}}, ~3/2 = 701.723{{c}}, ~28/25 = 193.995{{c}}
: [[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]]:  
Line 117: Line 123:
{{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): 1.045
[[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 2 1 | 0 1 2 5 2 | 0 0 -4 -10 -1 }}
{{Mapping|legend=1| 1 0 -2 -8 0 | 0 1 2 5 2 | 0 0 4 10 1 }}
: Mapping generators: ~2, ~3, ~18/11
: Mapping generators: ~2, ~3, ~11/9


[[Optimal tuning]]s:  
[[Optimal tuning]]s:  
* [[CTE]]: ~2 = 1200.000{{c}}, ~3/2 = 702.288{{c}}, ~18/11 = 854.313{{c}}
* [[WE]]: ~2 = 1199.8764{{c}}, ~3/2 = 702.4302{{c}}, ~11/9 = 345.5856{{c}}
* [[CWE]]: ~2 = 1200.000{{c}}, ~3/2 = 702.407{{c}}, ~18/11 = 854.350{{c}}
: [[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 }}
Line 140: Line 148:
Comma list: 352/351, 1001/1000, 3025/3024
Comma list: 352/351, 1001/1000, 3025/3024


Mapping: {{Mapping| 1 0 2 2 1 6 | 0 1 2 5 2 -1 | 0 0 -4 -10 -1 -1 }}
Mapping: {{Mapping| 1 0 -2 -8 0 5 | 0 1 2 5 2 -1 | 0 0 4 10 1 1 }}


Optimal tunings:  
Optimal tunings:  
* CTE: ~2 = 1200.000{{c}}, ~3/2 = 702.707{{c}}, ~18/11 = 854.537{{c}}
* WE: ~2 = 1199.6554{{c}}, ~3/2 = 702.8049{{c}}, ~11/9 = 345.3412{{c}}
* CWE: ~2 = 1200.000{{c}}, ~3/2 = 702.937{{c}}, ~18/11 = 854.554{{c}}
* 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): 1.159
Badness (Sintel): 1.16


== Semihemimean ==
== Semihemimean ==
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[[Optimal tuning]]s:  
[[Optimal tuning]]s:  
* [[CTE]]: ~99/70 = 600.000{{c}}, ~3/2 = 702.002{{c}}, ~28/25 = 193.633{{c}}
* [[WE]]: ~99/70 = 599.9102{{c}}, ~3/2 = 702.1314{{c}}, ~28/25 = 193.7431{{c}}
* [[CWE]]: ~99/70 = 600.000{{c}}, ~3/2 = 702.135{{c}}, ~28/25 = 193.712{{c}}
: [[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): 1.787
[[Badness]] (Sintel): 1.79


=== 13-limit ===
=== 13-limit ===
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Optimal tunings:  
Optimal tunings:  
* CTE: ~99/70 = 600.000{{c}}, ~3/2 = 701.838{{c}}, ~28/25 = 193.671{{c}}
* W: ~99/70 = 599.8791{{c}}, ~3/2 = 702.1476{{c}}, ~28/25 = 193.7877{{c}}
* CWE: ~99/70 = 600.000{{c}}, ~3/2 = 702.174{{c}}, ~28/25 = 193.787{{c}}
* 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): 1.550
[[Badness]] (Sintel): 1.55


=== 17-limit ===
=== 17-limit ===
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Optimal tunings:  
Optimal tunings:  
* CTE: ~17/12 = 600.000{{c}}, ~3/2 = 702.108{{c}}, ~28/25 = 193.723{{c}}
* WE: ~17/12 = 599.9481{{c}}, ~3/2 = 702.2594{{c}}, ~28/25 = 193.7763{{c}}
* CWE: ~17/12 = 600.000{{c}}, ~3/2 = 702.269{{c}}, ~28/25 = 193.776{{c}}
* 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): 1.743
[[Badness]] (Sintel): 1.74


=== 19-limit ===
=== 19-limit ===
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Optimal tunings:  
Optimal tunings:  
* CTE: ~17/12 = 600.000{{c}}, ~3/2 = 702.252{{c}}, ~19/17 = 193.758{{c}}
* WE: ~17/12 = 599.9687{{c}}, ~3/2 = 702.3501{{c}}, ~19/17 = 193.7922{{c}}
* CWE: ~17/12 = 600.000{{c}}, ~3/2 = 702.355{{c}}, ~19/17 = 193.792{{c}}
* 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 }}
{{Optimal ET sequence|legend=0| 12, …, 50, 68, 80, 118, 130, 198 }}


[[Badness]] (Sintel): 1.318
[[Badness]] (Sintel): 1.32


== Subgroup extensions ==
== Subgroup extensions ==
=== Hemimean orion (2.3.5.7.17) ===
=== 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 ([[28/25]])/([[19/17]]) = [[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.  
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]])}.
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
Subgroup: 2.3.5.7.17
Line 224: Line 234:


Optimal tunings:  
Optimal tunings:  
* CTE: ~2 = 1200.000{{c}}, ~3/2 = 702.196{{c}}, ~28/25 = 193.655{{c}}
* WE: ~2 = 1199.7919{{c}}, ~3/2 = 702.2561{{c}}, ~28/25 = 193.7586{{c}}
* CWE: ~2 = 1200.000{{c}}, ~3/2 = 702.304{{c}}, ~28/25 = 193.737{{c}}
* CWE: ~2 = 1200.0000{{c}}, ~3/2 = 702.3042{{c}}, ~28/25 = 193.7365{{c}}


{{Optimal ET sequence|legend=1| 12, 19g, 31g, …, 87, 99, 217, 229, 316, 328h, 446, 545c, 873cg }}
{{Optimal ET sequence|legend=0| 12, 19g, 31g, …, 87, 99, 217, 229, 316, 328, 446, 545c, 873cg }}


Badness (Sintel): 0.884
Badness (Sintel): 0.884
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Optimal tunings:  
Optimal tunings:  
* CTE: ~2 = 1200.000{{c}}, ~3/2 = 702.132{{c}}, ~19/17 = 193.647{{c}}
* WE: ~2 = 1199.8239{{c}}, ~3/2 = 702.1623{{c}}, ~19/17 = 193.7325{{c}}
* CWE: ~2 = 1200.000{{c}}, ~3/2 = 702.213{{c}}, ~19/17 = 193.716{{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 }}
{{Optimal ET sequence|legend=0| 12, 19gh, 31gh, …, 87, 99, 118, 210gh, 217, 229, 328h, 446 }}
Line 247: Line 257:


=== Semiorion (2.3.5.7.17) ===
=== 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]])}.  
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
Subgroup: 2.3.5.7.17
Line 257: Line 267:


Optimal tunings:  
Optimal tunings:  
* CTE: ~17/12 = 600.000{{c}}, ~3/2 = 702.347{{c}}, ~28/25 = 193.650{{c}}
* WE: ~17/12 = 600.0551{{c}}, ~3/2 = 702.1998{{c}}, ~28/25 = 193.5929{{c}}
* CWE: ~17/12 = 600.000{{c}}, ~3/2 = 702.218{{c}}, ~28/25 = 193.604{{c}}
* CWE: ~17/12 = 600.0000{{c}}, ~3/2 = 702.2183{{c}}, ~28/25 = 193.6044{{c}}


{{Optimal ET sequence|legend=1| 12, 30d, 38d, 50, 62, 68, 106d, 118, 248g, 316g }}
{{Optimal ET sequence|legend=0| 12, 30d, 38d, 50, 62, 68, 106d, 118, 248g, 316g }}


Badness (Sintel): 1.690
Badness (Sintel): 1.69


==== 2.3.5.7.17.19 subgroup ====
==== 2.3.5.7.17.19 subgroup ====
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Optimal tunings:  
Optimal tunings:  
* CTE: ~17/12 = 600.000{{c}}, ~3/2 = 702.509{{c}}, ~19/17 = 193.669{{c}}
* WE: ~17/12 = 600.0873{{c}}, ~3/2 = 702.2450{{c}}, ~19/17 = 193.5751{{c}}
* CWE: ~17/12 = 600.000{{c}}, ~3/2 = 702.279{{c}}, ~19/17 = 193.592{{c}}
* CWE: ~17/12 = 600.0000{{c}}, ~3/2 = 702.2791{{c}}, ~19/17 = 193.5923{{c}}


{{Optimal ET sequence|legend=0| 12, …, 50, 68, 106d, 118, 248g, 316g }}
{{Optimal ET sequence|legend=0| 12, 30dh, 38d, 50, 68, 106d, 118, 248g, 316g }}


Badness (Sintel): 0.722
Badness (Sintel): 0.722

Revision as of 08:28, 6 July 2026

This is a list showing technical temperament data. For an explanation of what information is shown here, you may look at the technical data guide for regular temperaments.

The hemimean family of rank-3 temperaments tempers out 3136/3125, the hemimean comma.

The hemimean comma is the difference between the septimal semicomma (126/125) and the 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 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)2.

Hemimean

Subgroup: 2.3.5.7

Comma list: 3136/3125

Mapping: [⟨1 0 0 -3], ⟨0 1 0 0], ⟨0 0 2 5]]

Mapping generators: ~2, ~3, ~56/25

Mapping to lattice: [⟨0 0 2 5], ⟨0 1 0 0]]

Lattice basis:

28/25 length = 0.5055, 3/2 length = 1.5849
Angle (28/25, 3/2) = 90 degrees

Optimal tunings:

  • WE: ~2 = 1199.8194 ¢, ~3/2 = 702.1353 ¢, ~28/25 = 193.7425 ¢
error map: ⟨-0.181 -0.000 +0.810 -0.474]
  • CWE: ~2 = 1200.000 ¢, ~3/2 = 702.1118 ¢, ~28/25 = 193.7167 ¢
error map: ⟨0.000 +0.157 +1.120 -0.243]

Minimax tuning:

[[1 0 0 0⟩, [0 1 0 0⟩, [6/5 0 0 2/5⟩, [0 0 0 1⟩]
Unchanged-interval (eigenmonzo) basis: 2.3.7

Optimal ET sequence: 12, 19, 31, 68, 80, 87, 99, 217, 229, 328, 347, 446, 675c

Badness (Sintel): 0.706

Complexity spectrum: 5/4, 7/5, 4/3, 6/5, 8/7, 7/6, 9/8, 10/9, 9/7

Projection pairs: 5 3136/625, 7 68841472/9765625 to 2.3.25/7

Belobog

Subgroup: 2.3.5.7.11

Comma list: 441/440, 3136/3125

Mapping: [⟨1 0 0 -3 -9], ⟨0 1 0 0 2], ⟨0 0 2 5 8]]

Mapping generators: ~2, ~3, ~56/25

Mapping to lattice: [⟨0 -2 2 5 4], ⟨0 -1 0 0 -2]]

Lattice basis:

28/25 length = 0.3829, 16/15 length = 1.1705
Angle (28/25, 16/15) = 93.2696

Optimal tunings:

  • WE: ~2 = 1200.0098 ¢, ~3/2 = 701.7170 ¢, ~28/25 = 193.5520 ¢
error map: ⟨+0.010 -0.228 +0.810 -1.046 +0.542]
  • CWE: ~2 = 1200.0000 ¢, ~3/2 = 701.7144 ¢, ~28/25 = 193.5518 ¢
error map: ⟨0.000 -0.241 +0.790 -1.067 +0.525]

Minimax tuning:

[[1 0 0 0 0⟩, [27/22 6/11 -5/22 -3/11 5/22⟩, [24/11 -4/11 -2/11 2/11 2/11⟩, [27/11 -10/11 -5/11 5/11 5/11⟩, [24/11 -4/11 -13/11 2/11 13/11⟩]
Unchanged-interval (eigenmonzo) basis: 2.9/7.11/5

Optimal ET sequence: 12, 19e, 31, 68e, 87, 99e, 118, 130, 217, 248

Badness (Sintel): 0.732

Projection pairs: 5 3136/625, 7 68841472/9765625, 11 1700108992512/152587890625 to 2.3.25/7

Scales: belobog31

13-limit

Subgroup: 2.3.5.7.11.13

Comma list: 441/440, 1001/1000, 3136/3125

Mapping: [⟨1 0 0 -3 -9 15], ⟨0 1 0 0 2 -2], ⟨0 0 2 5 8 -7]]

Optimal tunings:

  • WE: ~2 = 1199.9154 ¢, ~3/2 = 701.7875 ¢, ~28/25 = 193.5853 ¢
  • CWE: ~2 = 1200.0000 ¢, ~3/2 = 701.8346 ¢, ~28/25 = 193.5962 ¢

Optimal ET sequence: 31, 43, 56, 74, 87, 118, 130, 217, 248, 347e, 378, 465, 595e

Badness (Sintel): 1.03

Bellowblog

Subgroup: 2.3.5.7.11.13

Comma list: 196/195, 352/351, 625/624

Mapping: [⟨1 0 0 -3 -9 -4], ⟨0 1 0 0 2 -1], ⟨0 0 2 5 8 8]]

Optimal tunings:

  • WE: ~2 = 1200.000 ¢, ~3/2 = 702.5857 ¢, ~28/25 = 193.2930 ¢
  • CWE: ~2 = 1200.000 ¢, ~3/2 = 702.6342 ¢, ~28/25 = 193.2932 ¢

Optimal ET sequence: 12f, 19e, 31, 56, 68e, 87, 118, 186ef, 205d

Badness (Sintel): 1.18

Siebog

Subgroup: 2.3.5.7.11

Comma list: 540/539, 3136/3125

Mapping: [⟨1 0 0 -3 8], ⟨0 1 0 0 3], ⟨0 0 2 5 -8]]

Mapping generators: ~2, ~3, ~56/25

Optimal tunings:

  • WE: ~2 = 1199.5790 ¢, ~3/2 = 701.8397 ¢, ~28/25 = 194.0111 ¢
error map: ⟨-0.421 -0.536 +0.867 +0.388 +0.849]
  • CWE: ~2 = 1200.0000 ¢, ~3/2 = 701.7235 ¢, ~28/25 = 193.9948 ¢
error map: ⟨0.000 -0.232 +1.676 +1.148 +1.894]

Minimax tuning:

[[1 0 0 0 0⟩, [0 1 0 0 0⟩, [8/5 3/5 1/5 0 -1/5⟩, [1 3/2 1/2 0 -1/2⟩, [8/5 3/5 -4/5 0 4/5⟩]
Unchanged-interval (eigenmonzo) basis: 2.3.11/5

Optimal ET sequence: 12e, 18e, 19, 31, 68e, 80, 99e, 130, 210e, 241, 340ce, 371ce, 470cdee, 501cde, 581cdee, 711ccdee

Badness (Sintel): 1.05

Triglav

Subgroup: 2.3.5.7.11

Comma list: 3025/3024, 3136/3125

Mapping: [⟨1 0 -2 -8 0], ⟨0 1 2 5 2], ⟨0 0 4 10 1]]

Mapping generators: ~2, ~3, ~11/9

Optimal tunings:

  • WE: ~2 = 1199.8764 ¢, ~3/2 = 702.4302 ¢, ~11/9 = 345.5856 ¢
error map: ⟨-0.124 +0.352 +0.889 -0.448 -1.119]
  • CWE: ~2 = 1200.0000 ¢, ~3/2 = 702.4067 ¢, ~11/9 = 345.6505 ¢
error map: ⟨0.000 +0.452 +1.102 -0.288 -0.854]

Optimal ET sequence: 24d, 31, 80, 87, 111, 118, 198, 316, 514c, 545c

Badness (Sintel): 0.984

13-limit

Subgroup: 2.3.5.7.11.13

Comma list: 352/351, 1001/1000, 3025/3024

Mapping: [⟨1 0 -2 -8 0 5], ⟨0 1 2 5 2 -1], ⟨0 0 4 10 1 1]]

Optimal tunings:

  • WE: ~2 = 1199.6554 ¢, ~3/2 = 702.8049 ¢, ~11/9 = 345.3412 ¢
  • CWE: ~2 = 1200.0000 ¢, ~3/2 = 702.9366 ¢, ~11/9 = 345.4458 ¢

Optimal ET sequence: 24d, 31, 56, 80, 87, 111, 118, 167, 198

Badness (Sintel): 1.16

Semihemimean

Subgroup: 2.3.5.7.11

Comma list: 3136/3125, 9801/9800

Mapping: [⟨2 0 0 -6 -3], ⟨0 1 0 0 -2], ⟨0 0 2 5 7]]

Mapping generators: ~99/70, ~3, ~56/25

Optimal tunings:

  • WE: ~99/70 = 599.9102 ¢, ~3/2 = 702.1314 ¢, ~28/25 = 193.7431 ¢
error map: ⟨-0.180 -0.003 +0.813 -0.470 -0.008]
  • CWE: ~99/70 = 600.0000 ¢, ~3/2 = 702.1353 ¢, ~28/25 = 193.7122 ¢
error map: ⟨0.000 +0.180 +1.111 -0.265 +0.397]

Optimal ET sequence: 12, …, 38d, 50, 68, 80, 118, 130, 198, 248, 328, 446, 774c

Badness (Sintel): 1.79

13-limit

Subgroup: 2.3.5.7.11.13

Comma list: 1001/1000, 3136/3125, 4459/4455

Mapping: [⟨2 0 0 -6 -3 15], ⟨0 1 0 0 -2 2], ⟨0 0 2 5 7 -6]]

Optimal tunings:

  • W: ~99/70 = 599.8791 ¢, ~3/2 = 702.1476 ¢, ~28/25 = 193.7877 ¢
  • CWE: ~99/70 = 600.0000 ¢, ~3/2 = 702.1740 ¢, ~28/25 = 193.7869 ¢

Optimal ET sequence: 12, …, 50, 68, 80, 118, 130, 198, 328, 576cf, 774cf, 904cef

Badness (Sintel): 1.55

17-limit

Subgroup: 2.3.5.7.11.13.17

Comma list: 289/288, 561/560, 1001/1000, 1632/1625

Mapping: [⟨2 0 0 -6 -3 15 5], ⟨0 1 0 0 -2 2 1], ⟨0 0 2 5 7 -6 0]]

Optimal tunings:

  • WE: ~17/12 = 599.9481 ¢, ~3/2 = 702.2594 ¢, ~28/25 = 193.7763 ¢
  • CWE: ~17/12 = 600.0000 ¢, ~3/2 = 702.2692 ¢, ~28/25 = 193.7762 ¢

Optimal ET sequence: 12, …, 50, 68, 80, 118, 130, 198

Badness (Sintel): 1.74

19-limit

Subgroup: 2.3.5.7.11.13.17.19

Comma list: 289/288, 361/360, 456/455, 476/475, 561/560

Mapping: [⟨2 0 0 -6 -3 15 5 3], ⟨0 1 0 0 -2 2 1 1], ⟨0 0 2 5 7 -6 0 1]]

Optimal tunings:

  • WE: ~17/12 = 599.9687 ¢, ~3/2 = 702.3501 ¢, ~19/17 = 193.7922 ¢
  • CWE: ~17/12 = 600.0000 ¢, ~3/2 = 702.3549 ¢, ~19/17 = 193.7919 ¢

Optimal ET sequence: 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)2 = 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 {S16/S18, S17/S19, S18/S20(, (S16⋅S17)/(S19⋅S20) = (S16/S18)⋅(S17/S19)⋅(S18/S20))}.

Subgroup: 2.3.5.7.17

Comma list: 1701/1700, 3136/3125

Subgroup-val mapping: [⟨1 0 0 -3 -5], ⟨0 1 0 0 5], ⟨0 0 2 5 1]]

Optimal tunings:

  • WE: ~2 = 1199.7919 ¢, ~3/2 = 702.2561 ¢, ~28/25 = 193.7586 ¢
  • CWE: ~2 = 1200.0000 ¢, ~3/2 = 702.3042 ¢, ~28/25 = 193.7365 ¢

Optimal ET sequence: 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: [⟨1 0 0 -3 -5 -6], ⟨0 1 0 0 5 5], ⟨0 0 2 5 1 2]]

Optimal tunings:

  • WE: ~2 = 1199.8239 ¢, ~3/2 = 702.1623 ¢, ~19/17 = 193.7325 ¢
  • CWE: ~2 = 1200.0000 ¢, ~3/2 = 702.2129 ¢, ~19/17 = 193.7161 ¢

Optimal ET sequence: 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 {S17, S19, S16/S18, (S18/S20, 476/475 = S16/S20⋅S17/S19)}.

Subgroup: 2.3.5.7.17

Comma list: 289/288, 3136/3125

Subgroup-val 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 ¢, ~3/2 = 702.1998 ¢, ~28/25 = 193.5929 ¢
  • CWE: ~17/12 = 600.0000 ¢, ~3/2 = 702.2183 ¢, ~28/25 = 193.6044 ¢

Optimal ET sequence: 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: [⟨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 ¢, ~3/2 = 702.2450 ¢, ~19/17 = 193.5751 ¢
  • CWE: ~17/12 = 600.0000 ¢, ~3/2 = 702.2791 ¢, ~19/17 = 193.5923 ¢

Optimal ET sequence: 12, 30dh, 38d, 50, 68, 106d, 118, 248g, 316g

Badness (Sintel): 0.722

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