Semicomma family: Difference between revisions
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=Orson= | |||
The 5-limit parent comma for the '''semicomma family''' is the semicomma, 2109375/2097152 = |-21 3 7>. This is the amount by which three pure 3/1 twelfths exceed seven pure 8/5 minor sixths. '''Orson''', the [[5-limit|5-limit]] temperament tempering it out, has a [[generator|generator]] of 75/64, which is sharper than 7/6 by 225/224 when untempered, and less sharp than that in any good orson tempering, for example [[53edo|53edo]] or [[84edo|84edo]]. These give tunings to the generator which are sharp of 7/6 by less than five [[cent|cent]]s, making it hard to treat orson as anything other than an (at least) 7-limit system, leading to orwell. | |||
=Orson= | |||
The 5-limit parent comma for the | |||
Comma: 2109375/2097152 | Comma: 2109375/2097152 | ||
[[ | [[Tuning_Ranges_of_Regular_Temperaments|valid range]]: [257.143, 276.923] (14b to 13) | ||
nice range: [271.229, 271.708] | nice range: [271.229, 271.708] | ||
strict range: [271.229, 271.708] | strict range: [271.229, 271.708] | ||
[[ | [[POTE_tuning|POTE generator]]: ~75/64 = 271.627 | ||
Map: [<1 0 3|, <0 7 -3|] | Map: [<1 0 3|, <0 7 -3|] | ||
EDOs: 22, 31, 53, 190, 243, 296, 645c | EDOs: 22, 31, 53, 190, 243, 296, 645c | ||
Badness: 0.0408 | Badness: 0.0408 | ||
==Seven limit children== | ==Seven limit children== | ||
The second comma of the [[ | The second comma of the [[Normal_lists|normal comma list]] defines which 7-limit family member we are looking at. Adding 65536/64625 leads to orwell, but we could also add 1029/1024, leading to the 31&159 temperament with wedgie <<21 -9 -7 -63 -70 9||, or 67528125/67108864, giving the 31&243 temperament with wedgie <<28 -12 1 -84 -77 36||, or 4375/4374, giving the 53&243 temperament with wedgie <<7 -3 61 -21 77 150||. | ||
=Orwell= | =Orwell= | ||
Main article: [[Orwell]] | Main article: [[Orwell|Orwell]] | ||
So called because 19\84 (as a [[fraction of the octave]]) is a possible generator of this temperament, orwell divides the interval of a twelfth (a tempered 3/1 frequency ratio) into 7 equal steps. It's compatible with [[22edo|22]], [[31edo|31]], [[53edo|53]] and [[84edo|84]] equal, and may be described as the 22&31 temperament, or <<7 -3 8 -21 -7 27||. It's a good system in the [[7-limit]] and naturally extends into the [[11-limit]]. [[84edo]], with the 19\84 generator, provides a good tuning for the 5, 7 and 11 limits, but it does use its second-best 11. However, the 19\84 generator is remarkably close to the 11-limit [[POTE tuning]], as the generator is only 0.0024 cents sharper, and it is a good approximation to the 7-limit POTE generator also; hence 84 may be considered the most recommendable tuning in the 7-limit. [[53edo]] might be preferred in the 5-limit because of its nearly pure fifth and in the 11-limit because of it slightly better 11, though most of its 11-limit harmony is actually worse. Aside from the semicomma and 65625/65536, 7-limit orwell tempers out 2430/2401, the nuwell comma, 1728/1715, the orwellisma, 225/224, the septimal kleisma, and 6144/6125, the porwell comma. | |||
So called because 19\84 (as a [[fraction_of_the_octave|fraction of the octave]]) is a possible generator of this temperament, orwell divides the interval of a twelfth (a tempered 3/1 frequency ratio) into 7 equal steps. It's compatible with [[22edo|22]], [[31edo|31]], [[53edo|53]] and [[84edo|84]] equal, and may be described as the 22&31 temperament, or <<7 -3 8 -21 -7 27||. It's a good system in the [[7-limit|7-limit]] and naturally extends into the [[11-limit|11-limit]]. [[84edo|84edo]], with the 19\84 generator, provides a good tuning for the 5, 7 and 11 limits, but it does use its second-best 11. However, the 19\84 generator is remarkably close to the 11-limit [[POTE_tuning|POTE tuning]], as the generator is only 0.0024 cents sharper, and it is a good approximation to the 7-limit POTE generator also; hence 84 may be considered the most recommendable tuning in the 7-limit. [[53edo|53edo]] might be preferred in the 5-limit because of its nearly pure fifth and in the 11-limit because of it slightly better 11, though most of its 11-limit harmony is actually worse. Aside from the semicomma and 65625/65536, 7-limit orwell tempers out 2430/2401, the nuwell comma, 1728/1715, the orwellisma, 225/224, the septimal kleisma, and 6144/6125, the porwell comma. | |||
The 11-limit version of orwell tempers out 99/98, which means that two of its sharpened 7/6 generators give a flattened 11/8, as well as 121/120, 176/175, 385/384 and 540/539. Despite lowered tuning accuracy, orwell comes into its own in the 11-limit, giving acceptable accuracy and relatively low complexity. Tempering out the orwellisma, 1728/1715, means that orwell interprets three stacked 7/6 generators as an 8/5, and the tempered 1-7/6-11/8-8/5 chord is natural to orwell. | The 11-limit version of orwell tempers out 99/98, which means that two of its sharpened 7/6 generators give a flattened 11/8, as well as 121/120, 176/175, 385/384 and 540/539. Despite lowered tuning accuracy, orwell comes into its own in the 11-limit, giving acceptable accuracy and relatively low complexity. Tempering out the orwellisma, 1728/1715, means that orwell interprets three stacked 7/6 generators as an 8/5, and the tempered 1-7/6-11/8-8/5 chord is natural to orwell. | ||
Orwell has MOS of size 9, 13, 22 and 31. The 9-note MOS is small enough to be retained in the mind as a genuine scale, is pleasing melodically, and has [[ | Orwell has MOS of size 9, 13, 22 and 31. The 9-note MOS is small enough to be retained in the mind as a genuine scale, is pleasing melodically, and has [[Retuning_12edo_to_Orwell9|considerable harmonic resources]] despite its absence of 5-limit triads. The 13 note MOS has those, and of course the 22 and 31 note MOS are very well supplied with everything. | ||
[[Comma|Commas]]: 225/224, 1728/1715 | [[Comma|Commas]]: 225/224, 1728/1715 | ||
7-limit | 7-limit | ||
[|1 0 0 0>, |14/11 0 -7/11 7/11>, | [|1 0 0 0>, |14/11 0 -7/11 7/11>, | ||
|27/11 0 3/11 -3/11>, |27/11 0 -8/11 8/11>] | |27/11 0 3/11 -3/11>, |27/11 0 -8/11 8/11>] | ||
[[ | |||
[[Fractional_monzos|Eigenmonzos]]: 2, 7/5 | |||
9-limit | 9-limit | ||
[|1 0 0 0>, |21/17 14/17 -7/17 0>, | [|1 0 0 0>, |21/17 14/17 -7/17 0>, | ||
|42/17 -6/17 3/17 0>, |41/17 16/17 -8/17 0>] | |42/17 -6/17 3/17 0>, |41/17 16/17 -8/17 0>] | ||
[[Eigenmonzo|Eigenmonzos]]: 2, 10/9 | [[Eigenmonzo|Eigenmonzos]]: 2, 10/9 | ||
valid range: [266.667, 272.727] (9 to 22) | valid range: [266.667, 272.727] (9 to 22) | ||
nice range: [266.871, 271.708] | nice range: [266.871, 271.708] | ||
strict range: [266.871, 271.708] | strict range: [266.871, 271.708] | ||
[[ | [[POTE_tuning|POTE generator]]: ~7/6 = 271.509 | ||
Algebraic generators: Sabra3, the real root of 12x^3-7x-48. | Algebraic generators: Sabra3, the real root of 12x^3-7x-48. | ||
Map: [<1 0 3 1|, <0 7 -3 8|] | Map: [<1 0 3 1|, <0 7 -3 8|] | ||
Wedgie: <<7 -3 8 -21 -7 27|| | Wedgie: <<7 -3 8 -21 -7 27|| | ||
EDOs: 22, 31, 53, 84, 137, 221d, 358d | EDOs: 22, 31, 53, 84, 137, 221d, 358d | ||
Badness: 0.0207 | Badness: 0.0207 | ||
==11-limit== | ==11-limit== | ||
[[Comma|Commas]]: 99/98, 121/120, 176/175 | [[Comma|Commas]]: 99/98, 121/120, 176/175 | ||
[[Minimax tuning]] | [[Minimax_tuning|Minimax tuning]] | ||
[|1 0 0 0 0>, |14/11 0 -7/11 7/11 0>, |27/11 0 3/11 -3/11 0>, | [|1 0 0 0 0>, |14/11 0 -7/11 7/11 0>, |27/11 0 3/11 -3/11 0>, | ||
|27/11 0 -8/11 8/11 0>, |37/11 0 -2/11 2/11 0>] | |27/11 0 -8/11 8/11 0>, |37/11 0 -2/11 2/11 0>] | ||
[[Eigenmonzo|Eigenmonzos]]: 2, 7/5 | [[Eigenmonzo|Eigenmonzos]]: 2, 7/5 | ||
valid range: [270.968, 272.727] (31 to 22) | valid range: [270.968, 272.727] (31 to 22) | ||
nice range: [266.871, 275.659] | nice range: [266.871, 275.659] | ||
strict range: [270.968, 272.727] | strict range: [270.968, 272.727] | ||
[[ | [[POTE_tuning|POTE generator]]: ~7/6 = 271.426 | ||
Map: [<1 0 3 1 3|, <0 7 -3 8 2|] | Map: [<1 0 3 1 3|, <0 7 -3 8 2|] | ||
[[ | |||
[[EDO|Edos]]: [[22edo|22]], [[31edo|31]], [[53edo|53]], [[84edo|84e]] | |||
Badness: 0.0152 | Badness: 0.0152 | ||
==13-limit== | ==13-limit== | ||
Commas: 99/98, 121/120, 176/175, 275/273 | Commas: 99/98, 121/120, 176/175, 275/273 | ||
valid range: [270.968, 271.698] (31 to 53) | valid range: [270.968, 271.698] (31 to 53) | ||
nice range: [266.871, 275.659] | nice range: [266.871, 275.659] | ||
strict range: [270.968, 271.698] | strict range: [270.968, 271.698] | ||
[[ | [[POTE_tuning|POTE generator]]: ~7/6 = 271.546 | ||
Map: [<1 0 3 1 3 8|, <0 7 -3 8 2 -19|] | Map: [<1 0 3 1 3 8|, <0 7 -3 8 2 -19|] | ||
EDOs: 22, 31, 53, 84e, 137e | EDOs: 22, 31, 53, 84e, 137e | ||
Badness: 0.0197 | Badness: 0.0197 | ||
[[Orwell#Music|Music in Orwell]] | [[Orwell#Music|Music in Orwell]] | ||
==Blair== | ==Blair== | ||
Commas: 65/64, 78/77, 91/90, 99/98 | Commas: 65/64, 78/77, 91/90, 99/98 | ||
valid range: [] | valid range: [] | ||
nice range: [265.357, 289.210] | nice range: [265.357, 289.210] | ||
strict range: [] | strict range: [] | ||
| Line 100: | Line 120: | ||
Map: [<1 0 3 1 3 3|, <0 7 -3 8 2 3|] | Map: [<1 0 3 1 3 3|, <0 7 -3 8 2 3|] | ||
EDOs: 9, 22, 31f | EDOs: 9, 22, 31f | ||
Badness: 0.0231 | Badness: 0.0231 | ||
==Newspeak== | ==Newspeak== | ||
Commas: 225/224, 441/440, 1728/1715 | Commas: 225/224, 441/440, 1728/1715 | ||
valid range: [270.968, 271.698] (31 to 53) | valid range: [270.968, 271.698] (31 to 53) | ||
nice range: [266.871, 272.514] | nice range: [266.871, 272.514] | ||
strict range: [270.968, 271.698] | strict range: [270.968, 271.698] | ||
| Line 113: | Line 137: | ||
Map: [<1 0 3 1 -4|, <0 7 -3 8 33|] | Map: [<1 0 3 1 -4|, <0 7 -3 8 33|] | ||
EDOs: 31, 84, 115, 376b, 491bd, 606bde | EDOs: 31, 84, 115, 376b, 491bd, 606bde | ||
Badness: 0.0314 | Badness: 0.0314 | ||
==Winston== | ==Winston== | ||
Commas: 66/65, 99/98, 105/104, 121/120 | Commas: 66/65, 99/98, 105/104, 121/120 | ||
valid range: [270.968, 272.727] (31 to 22f) | valid range: [270.968, 272.727] (31 to 22f) | ||
nice range: [266.871, 281.691] | nice range: [266.871, 281.691] | ||
strict range: [270.968, 272.727] | strict range: [270.968, 272.727] | ||
[[ | [[POTE_tuning|POTE generator]]: ~7/6 = 271.088 | ||
Map: [<1 0 3 1 3 1|, <0 7 -3 8 2 12|] | Map: [<1 0 3 1 3 1|, <0 7 -3 8 2 12|] | ||
EDOs: 22f, 31 | EDOs: 22f, 31 | ||
Badness: 0.0199 | Badness: 0.0199 | ||
=Doublethink= | =Doublethink= | ||
Commas: 99/98, 121/120, 169/168, 176/175 | Commas: 99/98, 121/120, 169/168, 176/175 | ||
valid range: [135.484, 136.364] (62 to 44) | valid range: [135.484, 136.364] (62 to 44) | ||
nice range: [128.298, 138.573] | nice range: [128.298, 138.573] | ||
strict range: [135.484, 136.364] | strict range: [135.484, 136.364] | ||
| Line 139: | Line 171: | ||
Map: [<1 0 3 1 3 2|, <0 14 -6 16 4 15|] | Map: [<1 0 3 1 3 2|, <0 14 -6 16 4 15|] | ||
EDOs: 9, 35, 44, 53, 62, 115ef, 168ef | EDOs: 9, 35, 44, 53, 62, 115ef, 168ef | ||
Badness: 0.0271 | Badness: 0.0271 | ||
=Borwell= | =Borwell= | ||
Commas: 225/224, 243/242, 1728/1715 | Commas: 225/224, 243/242, 1728/1715 | ||
| Line 148: | Line 182: | ||
Map: [<1 7 0 9 17|, <0 -14 6 -16 -35|] | Map: [<1 7 0 9 17|, <0 -14 6 -16 -35|] | ||
EDOs: 31, 106, 137, 442bd | EDOs: 31, 106, 137, 442bd | ||
Badness: 0.0384 | Badness: 0.0384 | ||
=Triwell= | =Triwell= | ||
Commas: 1029/1024, 235298/234375 | Commas: 1029/1024, 235298/234375 | ||
| Line 157: | Line 193: | ||
Map: [<1 7 0 1|, <0 -21 9 7]] | Map: [<1 7 0 1|, <0 -21 9 7]] | ||
Wedgie: <<21 -9 -7 -63 -70 9|| | Wedgie: <<21 -9 -7 -63 -70 9|| | ||
EDOs: 31, 97, 128, 159, 190 | EDOs: 31, 97, 128, 159, 190 | ||
Badness: 0.0806 | Badness: 0.0806 | ||
==11-limit== | ==11-limit== | ||
Commas: 385/384, 441/440, 456533/455625 | Commas: 385/384, 441/440, 456533/455625 | ||
| Line 167: | Line 206: | ||
Map: [<1 7 0 1 13|, <0 -21 9 7 -37]] | Map: [<1 7 0 1 13|, <0 -21 9 7 -37]] | ||
EDOs: 31, 97, 128, 159, 190 | EDOs: 31, 97, 128, 159, 190 | ||
Badness: 0.0298 | |||
Badness: 0.0298 | |||
[[Category:family]] | |||
[[Category:listen]] | |||
[[Category:orwell]] | |||
[[Category:semicomma]] | |||
[[Category:theory]] | |||
[[Category:todo:add_definition]] | |||
[[Category:todo:intro]] | |||
Revision as of 00:00, 17 July 2018
Orson
The 5-limit parent comma for the semicomma family is the semicomma, 2109375/2097152 = |-21 3 7>. This is the amount by which three pure 3/1 twelfths exceed seven pure 8/5 minor sixths. Orson, the 5-limit temperament tempering it out, has a generator of 75/64, which is sharper than 7/6 by 225/224 when untempered, and less sharp than that in any good orson tempering, for example 53edo or 84edo. These give tunings to the generator which are sharp of 7/6 by less than five cents, making it hard to treat orson as anything other than an (at least) 7-limit system, leading to orwell.
Comma: 2109375/2097152
valid range: [257.143, 276.923] (14b to 13)
nice range: [271.229, 271.708]
strict range: [271.229, 271.708]
POTE generator: ~75/64 = 271.627
Map: [<1 0 3|, <0 7 -3|]
EDOs: 22, 31, 53, 190, 243, 296, 645c
Badness: 0.0408
Seven limit children
The second comma of the normal comma list defines which 7-limit family member we are looking at. Adding 65536/64625 leads to orwell, but we could also add 1029/1024, leading to the 31&159 temperament with wedgie <<21 -9 -7 -63 -70 9||, or 67528125/67108864, giving the 31&243 temperament with wedgie <<28 -12 1 -84 -77 36||, or 4375/4374, giving the 53&243 temperament with wedgie <<7 -3 61 -21 77 150||.
Orwell
Main article: Orwell
So called because 19\84 (as a fraction of the octave) is a possible generator of this temperament, orwell divides the interval of a twelfth (a tempered 3/1 frequency ratio) into 7 equal steps. It's compatible with 22, 31, 53 and 84 equal, and may be described as the 22&31 temperament, or <<7 -3 8 -21 -7 27||. It's a good system in the 7-limit and naturally extends into the 11-limit. 84edo, with the 19\84 generator, provides a good tuning for the 5, 7 and 11 limits, but it does use its second-best 11. However, the 19\84 generator is remarkably close to the 11-limit POTE tuning, as the generator is only 0.0024 cents sharper, and it is a good approximation to the 7-limit POTE generator also; hence 84 may be considered the most recommendable tuning in the 7-limit. 53edo might be preferred in the 5-limit because of its nearly pure fifth and in the 11-limit because of it slightly better 11, though most of its 11-limit harmony is actually worse. Aside from the semicomma and 65625/65536, 7-limit orwell tempers out 2430/2401, the nuwell comma, 1728/1715, the orwellisma, 225/224, the septimal kleisma, and 6144/6125, the porwell comma.
The 11-limit version of orwell tempers out 99/98, which means that two of its sharpened 7/6 generators give a flattened 11/8, as well as 121/120, 176/175, 385/384 and 540/539. Despite lowered tuning accuracy, orwell comes into its own in the 11-limit, giving acceptable accuracy and relatively low complexity. Tempering out the orwellisma, 1728/1715, means that orwell interprets three stacked 7/6 generators as an 8/5, and the tempered 1-7/6-11/8-8/5 chord is natural to orwell.
Orwell has MOS of size 9, 13, 22 and 31. The 9-note MOS is small enough to be retained in the mind as a genuine scale, is pleasing melodically, and has considerable harmonic resources despite its absence of 5-limit triads. The 13 note MOS has those, and of course the 22 and 31 note MOS are very well supplied with everything.
Commas: 225/224, 1728/1715
7-limit
[|1 0 0 0>, |14/11 0 -7/11 7/11>, |27/11 0 3/11 -3/11>, |27/11 0 -8/11 8/11>]
Eigenmonzos: 2, 7/5
9-limit
[|1 0 0 0>, |21/17 14/17 -7/17 0>, |42/17 -6/17 3/17 0>, |41/17 16/17 -8/17 0>]
Eigenmonzos: 2, 10/9
valid range: [266.667, 272.727] (9 to 22)
nice range: [266.871, 271.708]
strict range: [266.871, 271.708]
POTE generator: ~7/6 = 271.509
Algebraic generators: Sabra3, the real root of 12x^3-7x-48.
Map: [<1 0 3 1|, <0 7 -3 8|]
Wedgie: <<7 -3 8 -21 -7 27||
EDOs: 22, 31, 53, 84, 137, 221d, 358d
Badness: 0.0207
11-limit
Commas: 99/98, 121/120, 176/175
[|1 0 0 0 0>, |14/11 0 -7/11 7/11 0>, |27/11 0 3/11 -3/11 0>, |27/11 0 -8/11 8/11 0>, |37/11 0 -2/11 2/11 0>]
Eigenmonzos: 2, 7/5
valid range: [270.968, 272.727] (31 to 22)
nice range: [266.871, 275.659]
strict range: [270.968, 272.727]
POTE generator: ~7/6 = 271.426
Map: [<1 0 3 1 3|, <0 7 -3 8 2|]
Badness: 0.0152
13-limit
Commas: 99/98, 121/120, 176/175, 275/273
valid range: [270.968, 271.698] (31 to 53)
nice range: [266.871, 275.659]
strict range: [270.968, 271.698]
POTE generator: ~7/6 = 271.546
Map: [<1 0 3 1 3 8|, <0 7 -3 8 2 -19|]
EDOs: 22, 31, 53, 84e, 137e
Badness: 0.0197
Blair
Commas: 65/64, 78/77, 91/90, 99/98
valid range: []
nice range: [265.357, 289.210]
strict range: []
POTE generator: ~7/6 = 271.301
Map: [<1 0 3 1 3 3|, <0 7 -3 8 2 3|]
EDOs: 9, 22, 31f
Badness: 0.0231
Newspeak
Commas: 225/224, 441/440, 1728/1715
valid range: [270.968, 271.698] (31 to 53)
nice range: [266.871, 272.514]
strict range: [270.968, 271.698]
POTE tuning: ~7/6 = 271.288
Map: [<1 0 3 1 -4|, <0 7 -3 8 33|]
EDOs: 31, 84, 115, 376b, 491bd, 606bde
Badness: 0.0314
Winston
Commas: 66/65, 99/98, 105/104, 121/120
valid range: [270.968, 272.727] (31 to 22f)
nice range: [266.871, 281.691]
strict range: [270.968, 272.727]
POTE generator: ~7/6 = 271.088
Map: [<1 0 3 1 3 1|, <0 7 -3 8 2 12|]
EDOs: 22f, 31
Badness: 0.0199
Doublethink
Commas: 99/98, 121/120, 169/168, 176/175
valid range: [135.484, 136.364] (62 to 44)
nice range: [128.298, 138.573]
strict range: [135.484, 136.364]
POTE tuning: ~13/12 = 135.723
Map: [<1 0 3 1 3 2|, <0 14 -6 16 4 15|]
EDOs: 9, 35, 44, 53, 62, 115ef, 168ef
Badness: 0.0271
Borwell
Commas: 225/224, 243/242, 1728/1715
POTE generator: ~55/36 = 735.752
Map: [<1 7 0 9 17|, <0 -14 6 -16 -35|]
EDOs: 31, 106, 137, 442bd
Badness: 0.0384
Triwell
Commas: 1029/1024, 235298/234375
POTE generator: ~448/375 = 309.472
Map: [<1 7 0 1|, <0 -21 9 7]]
Wedgie: <<21 -9 -7 -63 -70 9||
EDOs: 31, 97, 128, 159, 190
Badness: 0.0806
11-limit
Commas: 385/384, 441/440, 456533/455625
POTE generator: ~448/375 = 309.471
Map: [<1 7 0 1 13|, <0 -21 9 7 -37]]
EDOs: 31, 97, 128, 159, 190
Badness: 0.0298