Compton family: Difference between revisions
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The '''Compton family''' tempers out the [[Pythagorean comma]], 531441/524288 = {{monzo| -19 12 }}, and hence the fifths form a closed 12-note circle of fifths, identical to [[12edo|12EDO]]. While the tuning of the fifth will be that of 12EDO, two cents flat, the tuning of the larger primes is not so constrained, and the point of these temperaments is to improve on it. | The '''Compton family''' tempers out the [[Pythagorean comma]], 531441/524288 = {{monzo| -19 12 }}, and hence the fifths form a closed 12-note circle of fifths, identical to [[12edo|12EDO]]. While the tuning of the fifth will be that of 12EDO, two cents flat, the tuning of the larger primes is not so constrained, and the point of these temperaments is to improve on it. | ||
== Compton | == Compton == | ||
In terms of the normal list, compton adds 413343/409600 = {{monzo| -14 10 -2 1 }} to the Pythagorean comma; however it can also be characterized by saying it adds [[225/224]]. Compton, however, does not need to be used as a 7-limit temperament; in the 5-limit it becomes the rank two 5-limit temperament tempering out the Pythagorean comma. In terms of equal temperaments, it is the 12&72 temperament, and [[72edo|72EDO]], [[84edo|84EDO]] or [[240edo|240EDO]] make for good tunings. Possible generators are 21/20, 10/9, the secor, 6/5, 5/4, 7/5 and most importantly, 81/80. | In terms of the normal list, compton adds 413343/409600 = {{monzo| -14 10 -2 1 }} to the Pythagorean comma; however it can also be characterized by saying it adds [[225/224]]. Compton, however, does not need to be used as a 7-limit temperament (also called as ''waage''); in the 5-limit it becomes the rank two 5-limit temperament tempering out the Pythagorean comma. In terms of equal temperaments, it is the 12&72 temperament, and [[72edo|72EDO]], [[84edo|84EDO]] or [[240edo|240EDO]] make for good tunings. Possible generators are 21/20, 10/9, the secor, 6/5, 5/4, 7/5 and most importantly, 81/80. | ||
In either the 5 or 7-limit, 240EDO is an excellent tuning, with 81/80 coming in at 15 cents exactly. In the 12EDO, the major third is sharp by 13.686 cents, and the minor third flat by 15.641 cents; adjusting these down and up by 15 cents puts them in excellent tune. | In either the 5 or 7-limit, 240EDO is an excellent tuning, with 81/80 coming in at 15 cents exactly. In the 12EDO, the major third is sharp by 13.686 cents, and the minor third flat by 15.641 cents; adjusting these down and up by 15 cents puts them in excellent tune. | ||
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[[Badness]]: 0.094494 | [[Badness]]: 0.094494 | ||
=== Waage === | === 7-limit (Waage) === | ||
Subgroup: 2.3.5.7 | Subgroup: 2.3.5.7 | ||
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== Hours == | == Hours == | ||
The hours temperament has a period of 1/24 octave and tempers out the cataharry comma (19683/19600) and the mirwomo comma (33075/32768). The name "hours" was so named for the following reasons - the period is 1/24 octave, and there are 24 hours per a day. | |||
Subgroup: 2.3.5.7 | Subgroup: 2.3.5.7 | ||
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== Decades == | == Decades == | ||
The decades temperament has a period of 1/36 octave and tempers out the [[1029/1024|gamelisma]] (1029/1024) and the stearnsma (118098/117649). The name "decades" was so named for the following reasons - the period is 1/36 octave, and there are 36 decades (''ten days'') per a year (12 months × 3 decades per a month). | |||
Subgroup: 2.3.5.7 | Subgroup: 2.3.5.7 | ||
Revision as of 01:31, 11 July 2021
The Compton family tempers out the Pythagorean comma, 531441/524288 = [-19 12⟩, and hence the fifths form a closed 12-note circle of fifths, identical to 12EDO. While the tuning of the fifth will be that of 12EDO, two cents flat, the tuning of the larger primes is not so constrained, and the point of these temperaments is to improve on it.
Compton
In terms of the normal list, compton adds 413343/409600 = [-14 10 -2 1⟩ to the Pythagorean comma; however it can also be characterized by saying it adds 225/224. Compton, however, does not need to be used as a 7-limit temperament (also called as waage); in the 5-limit it becomes the rank two 5-limit temperament tempering out the Pythagorean comma. In terms of equal temperaments, it is the 12&72 temperament, and 72EDO, 84EDO or 240EDO make for good tunings. Possible generators are 21/20, 10/9, the secor, 6/5, 5/4, 7/5 and most importantly, 81/80.
In either the 5 or 7-limit, 240EDO is an excellent tuning, with 81/80 coming in at 15 cents exactly. In the 12EDO, the major third is sharp by 13.686 cents, and the minor third flat by 15.641 cents; adjusting these down and up by 15 cents puts them in excellent tune.
In terms of the normal comma list, we may add 8019/8000 to get to the 11-limit version of compton, which also adds 441/440. For this 72EDO can be recommended as a tuning.
Subgroup: 2.3.5
Comma: 531441/524288
Mapping: [⟨12 19 0], ⟨0 0 1]
POTE generator: ~5/4 = 384.884 or ~81/80 = 15.116
Badness: 0.094494
7-limit (Waage)
Subgroup: 2.3.5.7
Comma list: 225/224, 250047/250000
Mapping: [⟨12 19 0 -22], ⟨0 0 1 2]]
POTE generator: ~5/4 = 383.7752
Badness: 0.035686
11-limit
Subgroup: 2.3.5.7.11
Comma list: 225/224, 441/440, 4375/4356
Mapping: [⟨12 19 0 -22 -42], ⟨0 0 1 2 3]]
POTE generator: ~5/4 = 383.2660
Vals: Template:Val list
Badness: 0.022235
13-limit
Subgroup: 2.3.5.7.11.13
Comma list: 225/224, 351/350, 364/363, 441/440
Mapping: [⟨12 19 0 -22 -42 -67], ⟨0 0 1 2 3 4]]
POTE generator: ~5/4 = 383.9628
Vals: Template:Val list
Badness: 0.021852
17-limit
Subgroup: 2.3.5.7.11.13.17
Comma list: 221/220, 225/224, 289/288, 351/350, 441/440
Mapping: [⟨12 19 0 -22 -42 -67 49], ⟨0 0 1 2 3 4 0]]
POTE generator: ~5/4 = 383.7500
Vals: Template:Val list
Badness: 0.017131
Comptone
Subgroup: 2.3.5.7.11.13
Comma list: 225/224, 325/324, 441/440, 1001/1000
Mapping: [⟨12 19 0 -22 -42 100], ⟨0 0 1 2 3 -2]]
POTE generator: ~5/4 = 382.6116
Vals: Template:Val list
Badness: 0.025144
17-limit
Subgroup: 2.3.5.7.11.13.17
Comma list: 225/224, 273/272, 289/288, 325/324, 441/440
Mapping: [⟨12 19 0 -22 -42 100 49], ⟨0 0 1 2 3 -2 0]]
POTE generator: ~5/4 = 382.5968
Vals: Template:Val list
Badness: 0.016361
Catler
In terms of the normal comma list, catler is characterized by the addition of the schisma, 32805/32768, to the Pythagorean comma, though it can also be characterized as adding 81/80, 128/125 or 648/625. In any event, the 5-limit is exactly the same as the 5-limit of 12EDO. Catler can also be characterized as the 12&24 temperament. 36EDO or 48EDO are possible tunings. Possible generators are 36/35, 21/20, 15/14, 8/7, 7/6, 6/5, 9/7, 7/5, and most importantly, 64/63.
Subgroup: 2.3.5.7
Comma list: 81/80, 128/125
Mapping: [⟨12 19 28 0], ⟨0 0 0 1]]
POTE generator: ~64/63 = 26.790
Badness: 0.050297
11-limit
Subgroup: 2.3.5.7.11
Comma list: 81/80, 99/98, 128/125
POTE generator: ~64/63 = 22.723
Mapping: [⟨12 19 28 0 -26], ⟨0 0 0 1 2]]
Vals: Template:Val list
Badness: 0.058213
Catlat
Subgroup: 2.3.5.7.11
Comma list: 81/80, 128/125, 540/539
POTE generator: ~64/63 = 27.864
Mapping: [⟨12 19 28 0 109], ⟨0 0 0 1 -2]]
Vals: Template:Val list
Badness: 0.081909
Catcall
Subgroup: 2.3.5.7.11
Comma list: 56/55, 81/80, 128/125
POTE generator: ~36/35 = 32.776
Mapping: [⟨12 19 28 0 8], ⟨0 0 0 1 1]]
Vals: Template:Val list
Badness: 0.034478
13-limit
Subgroup: 2.3.5.7.11.13
Comma list: 56/55, 66/65, 81/80, 105/104
POTE generator: ~36/35 = 37.232
Mapping: [⟨12 19 28 0 8 11], ⟨0 0 0 1 1 1]]
Vals: Template:Val list
Badness: 0.028363
17-limit
Subgroup: 2.3.5.7.11.13.17
Comma list: 51/50, 56/55, 66/65, 81/80, 105/104
POTE generator: ~36/35 = 39.777
Mapping: [⟨12 19 28 0 8 11 49], ⟨0 0 0 1 1 1 0]]
Vals: Template:Val list
Badness: 0.023246
19-limit
Subgroup: 2.3.5.7.11.13.17.19
Comma list: 51/50, 56/55, 66/65, 76/75, 81/80, 96/95
POTE generator: ~36/35 = 40.165
Mapping: [⟨12 19 28 0 8 11 49 51], ⟨0 0 0 1 1 1 0 0]]
Vals: Template:Val list
Badness: 0.018985
Duodecic
Subgroup: 2.3.5.7.11.13
Comma list: 56/55, 81/80, 91/90, 128/125
POTE generator: ~36/35 = 37.688
Mapping: [⟨12 19 28 0 8 78], ⟨0 0 0 1 1 -1]]
Vals: Template:Val list
Badness: 0.038307
17-limit
Subgroup: 2.3.5.7.11.13.17 Comma list: 51/50, 56/55, 81/80, 91/90, 128/125
POTE generator: ~36/35 = 38.097
Mapping: [⟨12 19 28 0 8 78 49], ⟨0 0 0 1 1 -1 0]]
Vals: Template:Val list
Badness: 0.027487
19-limit
Subgroup: 2.3.5.7.11.13.17.19
Comma list: 51/50, 56/55, 76/75, 81/80, 91/90, 96/95
POTE generator: ~36/35 = 38.080
Mapping: [⟨12 19 28 0 8 78 49 51], ⟨0 0 0 1 1 -1 0 0]]
Vals: Template:Val list
Badness: 0.020939
Duodecim
Subgroup: 2.3.5.7.11
Comma list: 36/35, 50/49, 64/63
Mapping: [⟨12 19 28 34 0], ⟨0 0 0 0 1]]
POTE generator: ~45/44 = 34.977
Badness: 0.030536
Hours
The hours temperament has a period of 1/24 octave and tempers out the cataharry comma (19683/19600) and the mirwomo comma (33075/32768). The name "hours" was so named for the following reasons - the period is 1/24 octave, and there are 24 hours per a day.
Subgroup: 2.3.5.7
Comma list: 19683/19600, 33075/32768
Mapping: [⟨24 38 0 123], ⟨0 0 1 -1]]
Wedgie: ⟨⟨ 0 24 -24 38 -38 -123 ]]
POTE generator: ~5/4 = 384.033
Badness: 0.116091
11-limit
Subgroup: 2.3.5.7.11
Comma list: 243/242, 385/384, 9801/9800
Mapping: [⟨24 38 0 123 83], ⟨0 0 1 -1 0]]
POTE generator: ~5/4 = 384.054
Vals: Template:Val list
Badness: 0.036248
13-limit
Subgroup: 2.3.5.7.11.13
Comma list: 243/242, 351/350, 364/363, 385/384
Mapping: [⟨24 38 0 123 83 33], ⟨0 0 1 -1 0 1]]
POTE generator: ~5/4 = 384.652
Vals: Template:Val list
Badness: 0.026931
Decades
The decades temperament has a period of 1/36 octave and tempers out the gamelisma (1029/1024) and the stearnsma (118098/117649). The name "decades" was so named for the following reasons - the period is 1/36 octave, and there are 36 decades (ten days) per a year (12 months × 3 decades per a month).
Subgroup: 2.3.5.7
Comma list: 1029/1024, 118098/117649
Mapping: [⟨36 57 0 101], ⟨0 0 1 0]]
Wedgie: ⟨⟨ 0 36 0 57 0 -101 ]]
POTE generator: ~5/4 = 384.764
Badness: 0.108016
11-limit
Subgroup: 2.3.5.7.11
Comma list: 540/539, 1029/1024, 4000/3993
Mapping: [⟨36 57 0 101 41], ⟨0 0 1 0 1]]
POTE generator: ~5/4 = 384.150
Vals: Template:Val list
Badness: 0.043088
Omicronbeta
Subgroup: 2.3.5.7.11.13
Comma list: 225/224, 243/242, 441/440, 4375/4356
Mapping: [⟨72 114 167 202 249 266], ⟨0 0 0 0 0 1]]
POTE generator: ~13/8 = 837.814
Badness: 0.029956