Hemififths: Difference between revisions
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{{About|the regular temperament|the irrational interval of a hemififth|Sqrt(3/2)}} | |||
{{Infobox regtemp | {{Infobox regtemp | ||
| Title = Hemififths | | Title = Hemififths | ||
| Subgroups = 2.3.5.7, 2.3.5.7.11, 2.3.5.7.11.13 | | Subgroups = 2.3.5.7, 2.3.5.7.11, 2.3.5.7.11.13 | ||
| Comma basis = [[2401/2400]], [[5120/5103]] ( | | Comma basis = [[2401/2400]], [[5120/5103]] (7-limit); <br> [[243/242]], [[441/440]], [[896/891]] (11-limit); <br>[[144/143]], [[196/195]], [[243/242]], [[364/363]] (13-limit) | ||
| | | Edo join 1 = 41 | Edo join 2 = 58 | ||
| Mapping = 1; 2 25 13 5 -1 | | Mapping = 1; 2 25 13 5 -1 | ||
| Generators = 49/40 | |||
| Generators tuning = 351.5 | |||
| Optimization method = CWE | |||
| Pergen = (P8, P5/2) | | Pergen = (P8, P5/2) | ||
| MOS scales = [[3L 4s]], [[7L 3s]], [[7L 10s]], [[17L 7s]], [[17L 24s]] | | MOS scales = [[3L 4s]], [[7L 3s]], [[7L 10s]], [[17L 7s]], [[17L 24s]] | ||
| Odd limit 1 = 9 | Mistuning 1 = 1.90 | Complexity 1 = 41 | | Odd limit 1 = 9 | Mistuning 1 = 1.90 | Complexity 1 = 41 | ||
| Odd limit 2 = | | Odd limit 2 = 13-limit 21 | Mistuning 2 = 7.77 | Complexity 2 = 41 | ||
}} | }} | ||
'''Hemififths''' is a [[regular temperament|temperament]] that uses a neutral third as a [[generator]], just as the name suggests. A stack of 13 generators represents [[7/4]] and a stack of 25 generators represents [[5/4]], [[tempering out]] the breedsma, [[2401/2400]], and the argent comma, [[5120/5103]]. | '''Hemififths''' is a [[regular temperament|temperament]] that uses a neutral third as a [[generator]], just as the name suggests. A stack of 13 generators represents [[7/4]] and a stack of 25 generators represents [[5/4]], [[tempering out]] the breedsma, [[2401/2400]], and the argent comma, [[5120/5103]]. | ||
| Line 30: | Line 29: | ||
! rowspan="2" | Cents* | ! rowspan="2" | Cents* | ||
! colspan="2" | Approximate ratios | ! colspan="2" | Approximate ratios | ||
|- | |- | ||
! 7-limit | ! 7-limit | ||
| Line 38: | Line 36: | ||
| 0.0 | | 0.0 | ||
| '''1/1''' | | '''1/1''' | ||
| | | | ||
|- | |- | ||
| 1 | | 1 | ||
| Line 45: | Line 42: | ||
| 49/40, 60/49 | | 49/40, 60/49 | ||
| 11/9, '''16/13''', 27/22, 39/32 | | 11/9, '''16/13''', 27/22, 39/32 | ||
|- | |- | ||
| 2 | | 2 | ||
| Line 51: | Line 47: | ||
| '''3/2''' | | '''3/2''' | ||
| | | | ||
|- | |- | ||
| 3 | | 3 | ||
| Line 57: | Line 52: | ||
| 90/49 | | 90/49 | ||
| 11/6, 24/13 | | 11/6, 24/13 | ||
|- | |- | ||
| 4 | | 4 | ||
| Line 63: | Line 57: | ||
| '''9/8''' | | '''9/8''' | ||
| | | | ||
|- | |- | ||
| 5 | | 5 | ||
| Line 69: | Line 62: | ||
| 112/81 | | 112/81 | ||
| '''11/8''', 18/13 | | '''11/8''', 18/13 | ||
|- | |- | ||
| 6 | | 6 | ||
| Line 75: | Line 67: | ||
| 27/16 | | 27/16 | ||
| 22/13 | | 22/13 | ||
|- | |- | ||
| 7 | | 7 | ||
| Line 81: | Line 72: | ||
| 28/27 | | 28/27 | ||
| 33/32, 27/26 | | 33/32, 27/26 | ||
|- | |- | ||
| 8 | | 8 | ||
| Line 87: | Line 77: | ||
| 80/63, 81/64 | | 80/63, 81/64 | ||
| 14/11, 33/26 | | 14/11, 33/26 | ||
|- | |- | ||
| 9 | | 9 | ||
| Line 93: | Line 82: | ||
| 14/9 | | 14/9 | ||
| | | | ||
|- | |- | ||
| 10 | | 10 | ||
| Line 99: | Line 87: | ||
| 40/21 | | 40/21 | ||
| 21/11 | | 21/11 | ||
|- | |- | ||
| 11 | | 11 | ||
| Line 105: | Line 92: | ||
| 7/6 | | 7/6 | ||
| | | | ||
|- | |- | ||
| 12 | | 12 | ||
| Line 111: | Line 97: | ||
| 10/7 | | 10/7 | ||
| | | | ||
|- | |- | ||
| 13 | | 13 | ||
| Line 117: | Line 102: | ||
| '''7/4''' | | '''7/4''' | ||
| | | | ||
|- | |- | ||
| 14 | | 14 | ||
| Line 123: | Line 107: | ||
| 15/14 | | 15/14 | ||
| 14/13 | | 14/13 | ||
|- | |- | ||
| 15 | | 15 | ||
| Line 129: | Line 112: | ||
| '''21/16''' | | '''21/16''' | ||
| | | | ||
|- | |- | ||
| 16 | | 16 | ||
| Line 135: | Line 117: | ||
| 45/28 | | 45/28 | ||
| 21/13 | | 21/13 | ||
|- | |- | ||
| 17 | | 17 | ||
| Line 141: | Line 122: | ||
| 63/32, 160/81 | | 63/32, 160/81 | ||
| 55/28, 65/33, 77/39 | | 55/28, 65/33, 77/39 | ||
|- | |- | ||
| 18 | | 18 | ||
| Line 147: | Line 127: | ||
| 98/81, 135/112 | | 98/81, 135/112 | ||
| 40/33 | | 40/33 | ||
|- | |- | ||
| 19 | | 19 | ||
| Line 153: | Line 132: | ||
| 40/27 | | 40/27 | ||
| | | | ||
|- | |- | ||
| 20 | | 20 | ||
| Line 159: | Line 137: | ||
| 49/27 | | 49/27 | ||
| 20/11 | | 20/11 | ||
|- | |- | ||
| 21 | | 21 | ||
| Line 165: | Line 142: | ||
| 10/9 | | 10/9 | ||
| | | | ||
|- | |- | ||
| 22 | | 22 | ||
| Line 171: | Line 147: | ||
| 49/36 | | 49/36 | ||
| 15/11 | | 15/11 | ||
|- | |- | ||
| 23 | | 23 | ||
| Line 177: | Line 152: | ||
| 5/3 | | 5/3 | ||
| | | | ||
|- | |- | ||
| 24 | | 24 | ||
| Line 183: | Line 157: | ||
| 49/48, 50/49 | | 49/48, 50/49 | ||
| 40/39, 45/44, 55/54, 65/64 | | 40/39, 45/44, 55/54, 65/64 | ||
|- | |- | ||
| 25 | | 25 | ||
| Line 189: | Line 162: | ||
| '''5/4''' | | '''5/4''' | ||
| | | | ||
|- | |- | ||
| 26 | | 26 | ||
| Line 195: | Line 167: | ||
| 49/32 | | 49/32 | ||
| 20/13 | | 20/13 | ||
|- | |- | ||
| 27 | | 27 | ||
| Line 201: | Line 172: | ||
| '''15/8''' | | '''15/8''' | ||
| | | | ||
|- | |- | ||
| 28 | | 28 | ||
| Line 207: | Line 177: | ||
| 147/128 | | 147/128 | ||
| 15/13 | | 15/13 | ||
|- | |- | ||
| 29 | | 29 | ||
| Line 213: | Line 182: | ||
| 45/32 | | 45/32 | ||
| | | | ||
|} | |} | ||
<nowiki/>* In 7-limit CWE tuning, | <nowiki/>* In 7-limit CWE tuning, octave reduced | ||
=== As a detemperament of 17et === | === As a detemperament of 17et === | ||
[[File: Hemififths 17et Detempering.png|thumb|Hemififths as a 58-tone 17et detempering]] | [[File: Hemififths 17et Detempering.png|thumb|Hemififths as a 58-tone 17et detempering]] | ||
Hemififths is very naturally considered as a [[detemperament]] of the [[17edo|17 equal temperament]]. The | Hemififths is very naturally considered as a [[detemperament]] of the [[17edo|17 equal temperament]]. The diagram on the right shows a 58-tone detempered scale, with a generator range of -28 to +29. 58 is the largest number of tones for a mos where intervals in the 17 categories do not overlap. Each category may be further divided into "sub", "plain" and "super" qualities, separated by the commatic step of -17 generator steps, which represents [[56/55]], [[64/63]], [[66/65]], [[78/77]], [[81/80]], [[91/90]], [[99/98]], [[121/120]], and [[169/168]]. Combining this division with the minor, neutral, and major qualities of the 17 equal temperament, hemififths gives us at least ''nine'' qualities for each diatonic category: subminor, minor, supraminor, subneutral, neutral, supraneutral, submajor, major, and supermajor. | ||
Notice also the little | Notice also the little interval between the largest of a category and the smallest of the next. This interval separates supraminor from subneutral and supraneutral from submajor, and spans 41 generator steps. 41edo tempers it out so that it conflates supraminor with subneutral and supraneutral with submajor, whereas 58edo exaggerates it to the size of the comma. 99edo tunes it to one half the size of the commatic step, which can be seen as a good compromise. | ||
{| class="wikitable center- | == Notation == | ||
Hemififths can be notated in [[neutral chain-of-fifths notation]], in which case 5/4 is represented by a sesqui-augmented second (C–D{{sesquisharp2}}), and 7/4 by a semi-augmented sixth (C–A{{demisharp2}}). In the 13-limit extension, 11/8 is represented by the semi-augmented fourth (C–F{{demisharp2}}), and 13/8 by the neutral sixth (C–A{{demiflat2}}). This, of course, defies the tradition of tertian harmony, as the [[just major triad]] on C is C–D{{sesquisharp2}}–G, for example, so one may want to adopt one or more additional modules of accidentals such as arrows or +/- signs to represent the commatic steps (-17 generator steps, a semidiminished second). | |||
Below is tabulated how to notate each prime harmonic with an arrow representing a commatic step (thus ↑C = D{{sesquiflat2}}). | |||
{| class="wikitable center-1 center-3" | |||
|+ style="font-size: 105%;" | Hemififths nomenclature<br>for selected intervals | |||
|- | |||
! Ratio | |||
! Nominal | |||
! Example | |||
|- | |||
| 3/2 | |||
| Perfect fifth | |||
| C–G | |||
|- | |||
| 5/4 | |||
| Down major third | |||
| C–↓E | |||
|- | |- | ||
| 7/4 | |||
| Down minor seventh | |||
| C–↓B♭ | |||
|- | |||
| 11/8 | |||
| Semi-augmented fourth | |||
| C–F{{demisharp2}} | |||
|- | |||
| 13/8 | |||
| Neutral sixth | |||
| C–A{{demiflat2}} | |||
|} | |||
=== Ups and downs notation === | |||
In [[Kite's ups and downs notation]], the equivalences are vvA1 and v\m2. Let ''c'' be the amount by which the fifth exceeds 7\12, then {{nowrap| ^1 {{=}} 50{{c}} + 3.5''c'' }} and {{nowrap| /1 {{=}} 50{{c}} − 8.5''c'' }}. For 7-limit CWE tuning, {{nowrap| ''c'' {{=}} 2.934{{c}} }}. | |||
{| class="wikitable center-1 right-2" | |||
|- | |- | ||
! | ! # | ||
! Cents* | |||
! | ! Ups and downs<br>notation | ||
! | ! Associated ratios | ||
! | |||
|- | |- | ||
| 0 | | 0 | ||
| 0.0 | |||
| P1 | | P1 | ||
| 1/1 | |||
|- | |- | ||
| 1 | | 1 | ||
| | | 351.5 | ||
| | | ~3 = ^m3 = vM3 | ||
| 11/9~16/13 | |||
| | |||
|- | |- | ||
| 2 | | 2 | ||
| | | 702.9 | ||
| P5 | |||
| | | 3/2 | ||
| | |||
|- | |- | ||
| 3 | | 3 | ||
| | | 1054.4 | ||
| | | ~7 = ^m7 = vM7 | ||
| | | 11/6~24/13 | ||
|- | |- | ||
| 4 | | 4 | ||
| | | 205.9 | ||
| M2 | |||
| | | 9/8 | ||
| | |||
|- | |- | ||
| 5 | | 5 | ||
| | | 557.3 | ||
| | | ~4 = ^4 = vA4 | ||
| 11/8~18/13 | |||
|- | |- | ||
| 6 | | 6 | ||
| | | 908.8 | ||
| M6 | |||
| 22/13~27/16 | |||
| | |||
| | |||
|- | |- | ||
| 7 | | 7 | ||
| | | 60.3 | ||
| ^1 = \m2 | |||
| 27/26~33/32 | |||
| | |||
|- | |- | ||
| 8 | | 8 | ||
| | | 411.7 | ||
| | | M3 | ||
| | | 14/11~33/26 | ||
|- | |- | ||
| 9 | | 9 | ||
| | | 763.2 | ||
| | | ^5 = \m6 | ||
| 14/9 | |||
| | |||
|- | |- | ||
| 10 | | 10 | ||
| | | 1114.7 | ||
| | | M7 | ||
| | | 21/11~40/21 | ||
|- | |- | ||
| 11 | | 11 | ||
| | | 266.1 | ||
| ^M2 = \m3 | |||
| | | 7/6 | ||
| | |||
|- | |- | ||
| 12 | | 12 | ||
| | | 617.6 | ||
| A4 = \~5 | |||
| 10/7 | |||
| | |||
| | |||
|- | |- | ||
| 13 | | 13 | ||
| | | 969.1 | ||
| ^M6 = \m7 | |||
| 7/4 | |||
| | |||
| | |||
|- | |- | ||
| 14 | | 14 | ||
| | | 120.5 | ||
| | | A1 = \~2 | ||
| | | 14/13~15/14 | ||
|- | |- | ||
| 15 | | 15 | ||
| | | 472.0 | ||
| ^M3 = \4 | |||
| 21/16 | |||
| | |||
| | |||
|- | |- | ||
| 16 | | 16 | ||
| | | 823.5 | ||
| | | A5 = \~6 | ||
| 21/13 | |||
|- | |- | ||
| 17 | | 17 | ||
| 1174.9 | |||
| ^M7 = \8 | |||
| 63/32~160/81 | |||
| | |||
| | |||
|- | |- | ||
| 18 | |||
| 326.4 | |||
| A2 = \~3 | |||
| 40/33 | |||
|- | |- | ||
| | | 19 | ||
| | | 677.9 | ||
| | | ^A4 = \5 | ||
| 40/27 | |||
|- | |- | ||
| | | 20 | ||
| | | 1029.3 | ||
| | | A6 = \~7 | ||
| 20/11 | |||
|- | |- | ||
| | | 21 | ||
| | | 180.8 | ||
| | | ^A1 = \M2 | ||
| 10/9 | |||
|- | |- | ||
| | | 22 | ||
| | | 532.3 | ||
| | | A3 = \~4 | ||
| 15/11 | |||
|- | |- | ||
| | | 23 | ||
| | | 883.7 | ||
| ^A5 = \M6 | |||
| | | 5/3 | ||
|- | |- | ||
| 24 | |||
| 35.2 | |||
| A7 - P8 = -d2 = ^\1 | |||
| 49/48~50/49 | |||
|- | |- | ||
| | | 25 | ||
| | | 386.7 | ||
| | | ^A2 = \M3 | ||
| 5/4 | |||
|- | |- | ||
| | | 26 | ||
| | | 738.1 | ||
| | | AA4 = ^\5 | ||
| 20/13 | |||
|- | |- | ||
| | | 27 | ||
| | | 1089.6 | ||
| | | ^A6 = \M7 | ||
| 15/8 | |||
|- | |- | ||
| | | 28 | ||
| | | 241.1 | ||
| | | AA1= ^\2 | ||
| 15/13 | |||
|- | |- | ||
| | | 29 | ||
| | | 592.5 | ||
| | | ^A3 = \A4 | ||
| 45/32 | |||
|} | |} | ||
<nowiki/>* In 7-limit CWE tuning, octave reduced | |||
== Chords == | == Chords and harmony == | ||
{{ | {{See also| Chords of hemififths }} | ||
== Scales == | == Scales == | ||
| Line 534: | Line 469: | ||
| | | | ||
| 350.000 | | 350.000 | ||
| | | 24c val, lower bound of 7- and 9-odd-limit diamond monotone | ||
|- | |- | ||
| | | | ||
| Line 549: | Line 484: | ||
| | | | ||
| 351.220 | | 351.220 | ||
| Lower bound of 11- to 15-odd-limit<br>and | | Lower bound of 11- to 15-odd-limit, <br>and 13-limit 21-odd-limit diamond monotone | ||
|- | |- | ||
| | | | ||
| Line 569: | Line 504: | ||
| | | | ||
| 351.429 | | 351.429 | ||
| | | 140ef val | ||
|- | |- | ||
| | | | ||
| Line 589: | Line 524: | ||
| 25/24 | | 25/24 | ||
| 351.472 | | 351.472 | ||
| Very close to [[ | | Very close to [[argent tuning]] with neutral intervals (351.47186 cents) | ||
|- | |- | ||
| | | | ||
| Line 604: | Line 539: | ||
| | | | ||
| 351.515 | | 351.515 | ||
| | | 99ef val | ||
|- | |- | ||
| | | | ||
| Line 634: | Line 569: | ||
| 15/13 | | 15/13 | ||
| 351.705 | | 351.705 | ||
| 15-odd-limit and | | 15-odd-limit and 13-limit 21-odd-limit minimax | ||
|- | |- | ||
| [[58edo|17\58]] | | [[58edo|17\58]] | ||
| Line 669: | Line 604: | ||
| | | | ||
| 352.000 | | 352.000 | ||
| | | 75ce val | ||
|- | |- | ||
| | | | ||
| Line 689: | Line 624: | ||
| | | | ||
| 352.941 | | 352.941 | ||
| | | 17c val, upper bound of 7- to 15-odd-limit, <br>and 13-limit 21-odd-limit diamond monotone | ||
|- | |- | ||
| | | | ||
| Line 709: | Line 644: | ||
[[Category:Rank-2 temperaments]] | [[Category:Rank-2 temperaments]] | ||
[[Category:Breedsmic temperaments]] | [[Category:Breedsmic temperaments]] | ||
[[Category: | [[Category:Aberschismic temperaments]] | ||
[[Category:Hemimage temperaments]] | [[Category:Hemimage temperaments]] | ||