61edo: Difference between revisions
Dave Keenan (talk | contribs) →Sagittal notation: Moved the explanation of ≈ to the end of the section. |
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== Theory == | == Theory == | ||
As an equal temperament, 61et is characterized by [[tempering out]] 20000/19683 ([[tetracot comma]]) and 262144/253125 ([[passion comma]]) in the 5-limit. In the 7-limit, the [[patent val]] {{val| 61 97 142 '''171''' }} [[support]]s [[valentine]] (15 & 46), and is the [[optimal patent val]] for [[freivald]] (24 & | As an equal temperament, 61et is characterized by [[tempering out]] 20000/19683 ([[tetracot comma]]) and 262144/253125 ([[passion comma]]) in the 5-limit. In the 7-limit, the [[patent val]] {{val| 61 97 142 '''171''' }} [[support]]s [[valentine]] (15 & 46), and is the [[optimal patent val]] for [[freivald]] (24 & 37) in the 7-, 11- and 13-limit. The 61d [[val]] {{val| 61 97 142 '''172''' }} is a great tuning for [[modus]] and [[quasisuper]], and is a simple but out-of-tune edo tuning for [[parakleismic]]. [[Peter Kosmorsky]] has an interesting poem about its tuning profile, as follows. | ||
=== Introductory poem === | === Introductory poem === | ||
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== Notation == | == Notation == | ||
=== Sagittal notation === | |||
This notation uses the same sagittal sequence as [[54edo #Sagittal notation|54edo]]. | |||
==== Evo flavor ==== | |||
====Evo flavor==== | |||
<imagemap> | <imagemap> | ||
File:61-EDO_Evo_Sagittal.svg | File:61-EDO_Evo_Sagittal.svg | ||
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</imagemap> | </imagemap> | ||
====Revo flavor==== | ==== Revo flavor ==== | ||
<imagemap> | <imagemap> | ||
File:61-EDO_Revo_Sagittal.svg | File:61-EDO_Revo_Sagittal.svg | ||
Line 67: | Line 65: | ||
</imagemap> | </imagemap> | ||
====Evo-SZ flavor==== | ==== Evo-SZ flavor ==== | ||
<imagemap> | <imagemap> | ||
File:61-EDO_Evo-SZ_Sagittal.svg | File:61-EDO_Evo-SZ_Sagittal.svg | ||
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</imagemap> | </imagemap> | ||
In the diagrams above, a sagittal symbol followed by an equals sign (=) means that the following comma is the symbol's [[Sagittal notation#Primary comma|primary comma]] (the comma it ''exactly'' represents in JI), while an approximately equals sign (≈) means it is a secondary comma (a comma it ''approximately'' represents in JI). In both cases the symbol exactly represents the tempered version of the comma in this | In the diagrams above, a sagittal symbol followed by an equals sign (=) means that the following comma is the symbol's [[Sagittal notation#Primary comma|primary comma]] (the comma it ''exactly'' represents in JI), while an approximately equals sign (≈) means it is a secondary comma (a comma it ''approximately'' represents in JI). In both cases the symbol exactly represents the tempered version of the comma in this edo. | ||
== Regular temperament properties == | |||
{| class="wikitable center-4 center-5 center-6" | |||
|- | |||
! rowspan="2" | [[Subgroup]] | |||
! rowspan="2" | [[Comma list]] | |||
! rowspan="2" | [[Mapping]] | |||
! rowspan="2" | Optimal<br>8ve stretch (¢) | |||
! colspan="2" | Tuning error | |||
|- | |||
! [[TE error|Absolute]] (¢) | |||
! [[TE simple badness|Relative]] (%) | |||
|- | |||
| 2.3 | |||
| {{Monzo| 97 -61 }} | |||
| {{Mapping| 61 97 }} | |||
| -1.97 | |||
| 1.97 | |||
| 10.0 | |||
|- | |||
| 2.3.5 | |||
| 20000/19683, 262144/253125 | |||
| {{Mapping| 61 97 142 }} | |||
| -2.33 | |||
| 1.69 | |||
| 8.59 | |||
|- style="border-top: double;" | |||
| 2.3.5.7 | |||
| 64/63, 2430/2401, 3125/3087 | |||
| {{mapping| 61 97 142 172 }} (61d) | |||
| -3.06 | |||
| 1.93 | |||
| 9.84 | |||
|- style="border-top: double;" | |||
| 2.3.5.7 | |||
| 126/125, 1029/1024, 2240/2187 | |||
| {{Mapping| 61 97 142 171 }} (61) | |||
| -1.32 | |||
| 2.29 | |||
| 11.7 | |||
|} | |||
=== Rank-2 temperaments === | |||
{| class="wikitable center-all left-5" | |||
|+ style="font-size: 105%;" | Table of rank-2 temperaments by generator | |||
|- | |||
! Periods<br>per 8ve | |||
! Generator* | |||
! Cents* | |||
! Associated<br>ratio* | |||
! Temperament | |||
|- | |||
| 1 | |||
| 3\61 | |||
| 59.0 | |||
| 28/27 | |||
| [[Dodecacot]] (61de…) | |||
|- | |||
| 1 | |||
| 4\61 | |||
| 78.7 | |||
| 22/21 | |||
| [[Valentine]] (61) | |||
|- | |||
| 1 | |||
| 5\61 | |||
| 98.4 | |||
| 16/15 | |||
| [[Passion]] (61de…) / [[passionate]] (61) | |||
|- | |||
| 1 | |||
| 7\61 | |||
| 137.7 | |||
| 13/12 | |||
| [[Quartemka]] (61) | |||
|- | |||
| 1 | |||
| 9\61 | |||
| 177.0 | |||
| 10/9 | |||
| [[Modus]] (61de) / [[wollemia]] (61e) | |||
|- | |||
| 1 | |||
| 11\61 | |||
| 236.1 | |||
| 8/7 | |||
| [[Rodan]] (61, 7-limit, out of tune) | |||
|- | |||
| 1 | |||
| 16\61 | |||
| 314.8 | |||
| 6/5 | |||
| [[Parakleismic]] (61d) | |||
|- | |||
| 1 | |||
| 23\61 | |||
| 452.5 | |||
| 13/10 | |||
| [[Maja]] (61d) | |||
|- | |||
| 1 | |||
| 25\61 | |||
| 491.8 | |||
| 4/3 | |||
| [[Quasisuper]] (61d) | |||
|- | |||
| 1 | |||
| 28\61 | |||
| 550.8 | |||
| 11/8 | |||
| [[Freivald]] (61) | |||
|} | |||
<nowiki/>* [[Normal lists|Octave-reduced form]], reduced to the first half-octave |