12edo: Difference between revisions
What is 15/13 doing in the wrong place on the error table? |
General cleanup. Really confusing when there were two sections of intervals. |
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The seventh partial ([[7/4]]) is "represented" by an interval which is sharp by over 31 cents, and stands out distinctly from the rest of the chord in a tetrad. Such tetrads are often used as dominant seventh chords in functional harmony, for which the 5-limit JI version would be 1/1 - 5/4 - 3/2 - 16/9, and while 12et officially supports septimal meantone via the [[val]] {{val|12 19 28 34}}, its credentials in the 7-limit department are distinctly cheesy. It cannot be said to represent 11 or 13 at all, though it does a quite credible 17 and an even better 19. Nevertheless its relative tuning accuracy is quite high, and 12edo is the fourth [[The Riemann Zeta Function and Tuning#Zeta EDO lists|zeta integral edo]]. | The seventh partial ([[7/4]]) is "represented" by an interval which is sharp by over 31 cents, and stands out distinctly from the rest of the chord in a tetrad. Such tetrads are often used as dominant seventh chords in functional harmony, for which the 5-limit JI version would be 1/1 - 5/4 - 3/2 - 16/9, and while 12et officially supports septimal meantone via the [[val]] {{val|12 19 28 34}}, its credentials in the 7-limit department are distinctly cheesy. It cannot be said to represent 11 or 13 at all, though it does a quite credible 17 and an even better 19. Nevertheless its relative tuning accuracy is quite high, and 12edo is the fourth [[The Riemann Zeta Function and Tuning#Zeta EDO lists|zeta integral edo]]. | ||
In terms of the kernel, which is to say the commas it tempers out, it tempers out the Pythagorean comma, 3 | In terms of the kernel, which is to say the commas it tempers out, it tempers out the Pythagorean comma, 3<sup>12</sup>/2<sup>19</sup>, the Didymus comma, [[81/80]], the diesis, [[128/125]], the diaschisma, [[2048/2025]], the Archytas comma, [[64/63]], the septimal quartertone, [[36/35]], the jubilisma, [[50/49]], the septimal semicomma, [[126/125]], and the septimal kleisma, [[225/224]]. Each of these affects the structure of 12et in specific ways, and tuning systems which share the comma in question will be similar to 12et in precisely those ways. | ||
== Intervals == | == Intervals == | ||
| Line 20: | Line 20: | ||
!Approximate JI Ratios* | !Approximate JI Ratios* | ||
|- | |- | ||
|0 | | 0 | ||
|0 | | 0 | ||
|unison | | unison | ||
|P1 | | P1 | ||
|D | | D | ||
|1/1 | | 1/1 | ||
|- | |- | ||
|1 | | 1 | ||
|100 | | 100 | ||
|aug 1sn, minor 2nd | | aug 1sn, minor 2nd | ||
|A1, m2 | | A1, m2 | ||
|D#, Eb | | D#, Eb | ||
|15/14, 16/15, 17/16, 18/17, 21/20, 25/24, 28/27 | | 15/14, 16/15, 17/16, 18/17, 21/20, 25/24, 28/27 | ||
|- | |- | ||
|2 | | 2 | ||
|200 | | 200 | ||
|major 2nd | | major 2nd | ||
|M2 | | M2 | ||
|E | | E | ||
|8/7, 9/8, 10/9, 17/15, 19/17 | | 8/7, 9/8, 10/9, 17/15, 19/17 | ||
|- | |- | ||
|3 | | 3 | ||
|300 | | 300 | ||
|minor 3rd | | minor 3rd | ||
|m3 | | m3 | ||
|F | | F | ||
|7/6, 6/5, 19/16 | | 7/6, 6/5, 19/16 | ||
|- | |- | ||
|4 | | 4 | ||
|400 | | 400 | ||
|major 3rd | | major 3rd | ||
|M3 | | M3 | ||
|F# | | F# | ||
|5/4, 9/7 | | 5/4, 9/7 | ||
|- | |- | ||
|5 | | 5 | ||
|500 | | 500 | ||
|perfect 4th | | perfect 4th | ||
|P4 | | P4 | ||
|G | | G | ||
|4/3 | | 4/3 | ||
|- | |- | ||
|6 | | 6 | ||
|600 | | 600 | ||
|aug 4th, dim 5th | | aug 4th, dim 5th | ||
|A4, d5 | | A4, d5 | ||
|G#, Ab | | G#, Ab | ||
|7/5, 10/7, 17/12, 24/17 | | 7/5, 10/7, 17/12, 24/17 | ||
|- | |- | ||
|7 | | 7 | ||
|700 | | 700 | ||
|perfect 5th | | perfect 5th | ||
|P5 | | P5 | ||
|A | | A | ||
|3/2 | | 3/2 | ||
|- | |- | ||
|8 | | 8 | ||
|800 | | 800 | ||
|minor 6th | | minor 6th | ||
|m6 | | m6 | ||
|Bb | | Bb | ||
|8/5, 14/9 | | 8/5, 14/9 | ||
|- | |- | ||
|9 | | 9 | ||
|900 | | 900 | ||
|major 6th | | major 6th | ||
|M6 | | M6 | ||
|B | | B | ||
|5/3, 12/7, 32/19 | | 5/3, 12/7, 32/19 | ||
|- | |- | ||
|10 | | 10 | ||
|1000 | | 1000 | ||
|minor 7th | | minor 7th | ||
|m7 | | m7 | ||
|C | | C | ||
|7/4, 9/5, 16/9 | | 7/4, 9/5, 16/9 | ||
|- | |- | ||
|11 | | 11 | ||
|1100 | | 1100 | ||
|major 7th | | major 7th | ||
|M7 | | M7 | ||
|C# | | C# | ||
|15/8, 17/9, 28/15, 40/21, 48/25, 27/14 | | 15/8, 17/9, 28/15, 40/21, 48/25, 27/14 | ||
|- | |- | ||
|19 | | 19 | ||
|1200 | | 1200 | ||
|perfect 8ve | | perfect 8ve | ||
|P8 | | P8 | ||
|D | | D | ||
|2/1 | | 2/1 | ||
|} | |} | ||
<nowiki>*</nowiki> based on treating 12-edo as a 2.3.5.7.17.19 subgroup temperament; other approaches are possible. | <nowiki>*</nowiki> based on treating 12-edo as a 2.3.5.7.17.19 subgroup temperament; other approaches are possible. | ||
=== Selected just intervals by error === | |||
{| class="wikitable" style="text-align:center;" | |||
! | |||
! prime 2 | |||
! prime 3 | |||
! prime 5 | |||
! prime 7 | |||
! prime 11 | |||
! prime 13 | |||
|- | |||
! Error (¢) | |||
| 0 | |||
| -1.96 | |||
| +13.7 | |||
| +31.2 | |||
| +48.7 | |||
| -40.5 | |||
|- | |||
! [[Fifthspan]] | |||
| 0 | |||
| +1 | |||
| +4 | |||
| -2 | |||
| +6 | |||
| -4 | |||
|} | |||
==== 15-odd-limit interval mappings ==== | |||
The following table shows how [[15-odd-limit intervals]] are represented in 12edo. Prime harmonics are in '''bold'''; inconsistent intervals are in ''italic''. | |||
{| class="wikitable center-all" | |||
|- | |||
! Interval, complement | |||
! Error (abs, [[cent|¢]]) | |||
|- | |||
| '''[[4/3]], [[3/2]]''' | |||
| '''1.955''' | |||
|- | |||
| [[9/8]], [[16/9]] | |||
| 3.910 | |||
|- | |||
| ''[[13/11]], [[22/13]]'' | |||
| ''10.790'' | |||
|- | |||
| [[16/15]], [[15/8]] | |||
| 11.731 | |||
|- | |||
| '''[[5/4]], [[8/5]]''' | |||
| '''13.686''' | |||
|- | |||
| [[6/5]], [[5/3]] | |||
| 15.641 | |||
|- | |||
| [[7/5]], [[10/7]] | |||
| 17.488 | |||
|- | |||
| [[14/11]], [[11/7]] | |||
| 17.508 | |||
|- | |||
| [[10/9]], [[9/5]] | |||
| 17.596 | |||
|- | |||
| [[15/14]], [[28/15]] | |||
| 19.443 | |||
|- | |||
| ''[[14/13]], [[13/7]]'' | |||
| ''28.298'' | |||
|- | |||
| '''[[8/7]], [[7/4]]''' | |||
| '''31.174''' | |||
|- | |||
| [[7/6]], [[12/7]] | |||
| 33.129 | |||
|- | |||
| [[11/10]], [[20/11]] | |||
| 34.996 | |||
|- | |||
| [[9/7]], [[14/9]] | |||
| 35.084 | |||
|- | |||
| [[18/13]], [[13/9]] | |||
| 36.618 | |||
|- | |||
| [[15/11]], [[22/15]] | |||
| 36.951 | |||
|- | |||
| [[13/12]], [[24/13]] | |||
| 38.573 | |||
|- | |||
| '''[[16/13]], [[13/8]]''' | |||
| '''40.528''' | |||
|- | |||
| ''[[13/10]], [[20/13]]'' | |||
| ''45.786'' | |||
|- | |||
| ''[[11/9]], [[18/11]]'' | |||
| ''47.408'' | |||
|- | |||
| ''[[15/13]], [[26/15]]'' | |||
| ''47.741 '' | |||
|- | |||
| '''[[11/8]], [[16/11]]''' | |||
| '''48.682''' | |||
|- | |||
| ''[[12/11]], [[11/6]]'' | |||
| ''49.323'' | |||
|} | |||
==== Selected 19-limit intervals ==== | |||
[[File:12ed2-11-001.svg|alt=alt : Your browser has no SVG support.]] | |||
An expanded version of the above, including some higher-limit intervals: | |||
[[File:12ed2-19-001e.svg|alt=alt : Your browser has no SVG support.]] | |||
== Rank two temperaments == | == Rank two temperaments == | ||
| Line 126: | Line 243: | ||
| 1 | | 1 | ||
| 1\12 | | 1\12 | ||
| [[ | | [[Ripple]] | ||
|- | |- | ||
| 1 | | 1 | ||
| 5\12 | | 5\12 | ||
| [[ | | [[Meantone]]/[[dominant]] | ||
|- | |- | ||
| 2 | | 2 | ||
| 1\12 | | 1\12 | ||
| [[ | | [[Srutal]]/[[pajara]]/[[injera]] | ||
|- | |- | ||
| 3 | | 3 | ||
| 1\12 | | 1\12 | ||
| [[ | | [[Augmented]] | ||
|- | |- | ||
| 4 | | 4 | ||
| 1\12 | | 1\12 | ||
| [[ | | [[Diminished]] | ||
|- | |- | ||
| 6 | | 6 | ||
| 1\12 | | 1\12 | ||
| [[ | | [[Hexe]] | ||
|} | |} | ||
== Scales == | |||
''Main article: [[MOS in 12edo]]'' | |||
== Commas == | == Commas == | ||
12 EDO [[tempering_out|tempers out]] the following [[Comma| | 12 EDO [[tempering_out|tempers out]] the following [[Comma|commas]]. (Note: This assumes [[val]] {{val| 12 19 28 34 42 44 }}.) | ||
{| class="wikitable" | {| class="wikitable center-all left-2 right-3" | ||
|- | |- | ||
! Rational | ! Rational | ||
| Line 162: | Line 282: | ||
! Name 3 | ! Name 3 | ||
|- | |- | ||
| [[648/625]] | |||
| {{Monzo| 3 4 -4 }} | | {{Monzo| 3 4 -4 }} | ||
| 62.57 | |||
| Quadgu | |||
| Major diesis | |||
| Diminished comma | |||
| | |||
|- | |- | ||
| [[36/35]] | |||
| {{Monzo| 2 2 -1 -1 }} | | {{Monzo| 2 2 -1 -1 }} | ||
| 48.77 | |||
| Rugu | |||
| Septimal quartertone | |||
| | |||
| | |||
|- | |- | ||
| [[128/125]] | |||
| {{Monzo| 7 0 -3 }} | | {{Monzo| 7 0 -3 }} | ||
| 41.06 | |||
| Trigu | |||
| Diesis | |||
| Augmented comma | |||
| | |||
|- | |- | ||
| [[50/49]] | |||
| {{Monzo| 1 0 2 -2 }} | | {{Monzo| 1 0 2 -2 }} | ||
| 34.98 | |||
| Biruyo | |||
| Tritonic diesis | |||
| Jubilisma | |||
| | |||
|- | |- | ||
| [[64/63]] | |||
| {{Monzo| 6 -2 0 -1 }} | | {{Monzo| 6 -2 0 -1 }} | ||
| 27.26 | |||
| Ru | |||
| Septimal comma | |||
| Archytas' comma | |||
| Leipziger Komma | |||
|- | |- | ||
| [[531441/524288]] | |||
| {{Monzo| -19 12 }} | | {{Monzo| -19 12 }} | ||
| 23.46 | |||
| Lalawa | |||
| Pythagorean comma | |||
| | |||
| | |||
|- | |- | ||
| [[81/80]] | |||
| {{Monzo| -4 4 -1 }} | | {{Monzo| -4 4 -1 }} | ||
| 21.51 | |||
| Gu | |||
| Syntonic comma | |||
| Didymos comma | |||
| Meantone comma | |||
|- | |- | ||
| 3125/3087 | |||
| {{Monzo| 0 -2 5 -3 }} | | {{Monzo| 0 -2 5 -3 }} | ||
| 21.18 | |||
| Triru-aquinyo | |||
| Gariboh | |||
| | |||
| | |||
|- | |- | ||
| 2048/2025 | |||
| {{Monzo| 11 -4 -2 }} | | {{Monzo| 11 -4 -2 }} | ||
| 19.55 | |||
| Sagugu | |||
| Diaschisma | |||
| | |||
| | |||
|- | |- | ||
| 91/90 | |||
| {{Monzo| -1 -2 -1 1 0 1 }} | | {{Monzo| -1 -2 -1 1 0 1 }} | ||
| 19.13 | |||
| Thozogu | |||
| Superleap | |||
| | |||
| | |||
|- | |- | ||
| 5201701/5149091 | |||
| {{Monzo| 26 -12 -3 }} | | {{Monzo| 26 -12 -3 }} | ||
| 17.60 | |||
| Sasa-trigu | |||
| Misty comma | |||
| | |||
| | |||
|- | |- | ||
| [[99/98]] | |||
| {{Monzo| -1 2 0 -2 1 }} | | {{Monzo| -1 2 0 -2 1 }} | ||
| 17.58 | |||
| Loruru | |||
| Mothwellsma | |||
| | |||
| | |||
|- | |- | ||
| [[100/99]] | |||
| {{Monzo| 2 -2 2 0 -1 }} | | {{Monzo| 2 -2 2 0 -1 }} | ||
| 17.40 | |||
| Luyoyo | |||
| Ptolemisma | |||
| | |||
| | |||
|- | |- | ||
| [[126/125]] | |||
| {{Monzo| 1 2 -3 1 }} | | {{Monzo| 1 2 -3 1 }} | ||
| 13.79 | |||
| Zotrigu | |||
| Septimal semicomma | |||
| Starling comma | |||
| | |||
|- | |- | ||
| 4000/3969 | |||
| {{Monzo| 5 -4 3 -2 }} | | {{Monzo| 5 -4 3 -2 }} | ||
| 13.47 | |||
| Rurutriyo | |||
| Octagar | |||
| | |||
| | |||
|- | |- | ||
| 176/175 | |||
| {{Monzo| 4 0 -2 -1 1 }} | | {{Monzo| 4 0 -2 -1 1 }} | ||
| 9.86 | |||
| Lorugugu | |||
| Valinorsma | |||
| | |||
| | |||
|- | |- | ||
| 896/891 | |||
| {{Monzo| 7 -4 0 1 -1 }} | | {{Monzo| 7 -4 0 1 -1 }} | ||
| 9.69 | |||
| Saluzo | |||
| Pentacircle | |||
| | |||
| | |||
|- | |- | ||
| 321489/320000 | |||
| {{Monzo| -9 8 -4 2 }} | | {{Monzo| -9 8 -4 2 }} | ||
| 8.04 | |||
| Labizogugu | |||
| Varunisma | |||
| | |||
| | |||
|- | |- | ||
| [[225/224]] | |||
| {{Monzo| -5 2 2 -1 }} | | {{Monzo| -5 2 2 -1 }} | ||
| 7.71 | |||
| Ruyoyo | |||
| Septimal kleisma | |||
| Marvel comma | |||
| | |||
|- | |- | ||
| 3136/3125 | |||
| {{Monzo| 6 0 -5 2 }} | | {{Monzo| 6 0 -5 2 }} | ||
| 6.08 | |||
| Zozoquingu | |||
| Hemimean | |||
| | |||
| | |||
|- | |- | ||
| 5120/5103 | |||
| {{Monzo| 10 -6 1 -1 }} | | {{Monzo| 10 -6 1 -1 }} | ||
| 5.76 | |||
| Saruyo | |||
| Hemifamity | |||
| | |||
| | |||
|- | |- | ||
| 441/440 | |||
| {{Monzo| -3 2 -1 2 -1 }} | | {{Monzo| -3 2 -1 2 -1 }} | ||
| 3.93 | |||
| Luzozogu | |||
| Werckisma | |||
| | |||
| | |||
|- | |- | ||
| 33554432/33480783 | |||
| {{Monzo| 25 -14 0 -1 }} | | {{Monzo| 25 -14 0 -1 }} | ||
| 3.80 | |||
| Sasaru | |||
| Garischisma | |||
| | |||
| | |||
|- | |- | ||
| [[32805/32768|32805/32768]] | |||
| {{Monzo| -15 8 1 }} | | {{Monzo| -15 8 1 }} | ||
| 1.95 | |||
| Layo | |||
| Schisma | |||
| | |||
| | |||
|- | |- | ||
| 703125/702464 | |||
| {{Monzo| -11 2 7 -3 }} | | {{Monzo| -11 2 7 -3 }} | ||
| 1.63 | |||
| Latriru-asepyo | |||
| Meter | |||
| | |||
| | |||
|- | |- | ||
| 250047/250000 | |||
| {{Monzo| -4 6 -6 3 }} | | {{Monzo| -4 6 -6 3 }} | ||
| 0.33 | |||
| Trizogugu | |||
| Landscape comma | |||
| | |||
| | |||
|- | |- | ||
| 9801/9800 | |||
| {{Monzo| -3 4 -2 -2 2 }} | | {{Monzo| -3 4 -2 -2 2 }} | ||
| 0.18 | |||
| Bilorugu | |||
| Kalisma | |||
| Gauss' comma | |||
| | |||
|- | |- | ||
| | |||
| {{Monzo| 161 -84 -12 }} | | {{Monzo| 161 -84 -12 }} | ||
| 0.02 | |||
| Sepbisa-quadtrigu | |||
| Atom | |||
| | | | ||
| | |||
| | |||
|} | |} | ||