Opossum: Difference between revisions
Wikispaces>keenanpepper **Imported revision 246788043 - Original comment: ** |
m Text replacement - "Eigenmonzo<br>(unchanged-interval)" to "Unchanged interval<br>(eigenmonzo)" |
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'''Opossum''' is an alternative [[extension]] to [[porcupine]]. It is defined by [[tempering out]] [[28/27]] and [[126/125]]. | |||
See [[Porcupine family #Opossum]] for technical data. | |||
== Interval chain == | |||
In the following table, odd harmonics 1–11 and their inverses are in '''bold'''. | |||
< | |||
{| class="wikitable center-1 right-2" | |||
|- | |||
! # | |||
! Cents* | |||
! Approximate ratios* | |||
|- | |||
| 0 | |||
| 0.0 | |||
| '''1/1''' | |||
|- | |||
| 1 | |||
| 160.0 | |||
| 10/9, 11/10, 12/11, 15/14 | |||
|- | |||
| 2 | |||
| 320.0 | |||
| 6/5, 11/9 | |||
|- | |||
| 3 | |||
| 480.0 | |||
| '''4/3''', 9/7 | |||
|- | |||
| 4 | |||
| 640.0 | |||
| 10/7, '''16/11''', 22/15 | |||
|- | |||
| 5 | |||
| 800.0 | |||
| '''8/5''', 11/7 | |||
|- | |||
| 6 | |||
| 960.0 | |||
| 12/7, '''16/9''' | |||
|- | |||
| 7 | |||
| 1120.0 | |||
| 40/21, 48/25, 64/33 | |||
|- | |||
| 8 | |||
| 80.0 | |||
| 16/15, 36/35 | |||
|- | |||
| 9 | |||
| 240.0 | |||
| '''8/7''' | |||
|} | |||
<nowiki/>* In 15edo tuning, octave reduced | |||
== Tunings == | |||
{| class="wikitable center-1 mw-collapsible mw-collapsed" | |||
|+ style="font-size: 105%; white-space: nowrap;" | Least-squares tunings | |||
|- | |||
! Target | |||
! Generator | |||
! Eigenmonzo | |||
|- | |||
| 5-odd-limit | |||
| ~10/9 = 162.996{{c}} | |||
| 262144/234375 | |||
|- | |||
| 7-odd-limit | |||
| ~10/9 = 158.732{{c}} | |||
| {{Monzo| 0 -5 3 19 }} | |||
|- | |||
| 9-odd-limit | |||
| ~12/11 = 159.481{{c}} | |||
| {{Monzo| 0 3 2 22 }} | |||
|- | |||
| 11-odd-limit | |||
| ~12/11 = 159.564{{c}} | |||
| {{Monzo| -27 2 1 9 -1 }} | |||
|- | |||
| 13-odd-limit | |||
| ~12/11 = 158.421{{c}} | |||
| {{Monzo| 0 15 6 34 -1 -15 }} | |||
|- | |||
| 15-odd-limit | |||
| ~12/11 = 159.377{{c}} | |||
| {{Monzo| 0 32 23 35 -5 -21 }} | |||
|} | |||
=== Tuning spectrum === | |||
{| class="wikitable center-all left-4" | |||
|- | |||
! Edo<br>generator | |||
! [[Eigenmonzo|Unchanged interval<br>(eigenmonzo)]] | |||
! Generator (¢) | |||
! Comments | |||
|- | |||
| | |||
| 15/14 | |||
| 119.443 | |||
| | |||
|- | |||
| | |||
| 13/12 | |||
| 138.573 | |||
| | |||
|- | |||
| | |||
| 13/11 | |||
| 144.605 | |||
| | |||
|- | |||
| | |||
| 9/7 | |||
| 145.028 | |||
| | |||
|- | |||
| 1\8 | |||
| | |||
| 150.000 | |||
| 8d val, lower bound of 7-odd-limit diamond monotone | |||
|- | |||
| | |||
| 11/6 | |||
| 150.637 | |||
| | |||
|- | |||
| | |||
| 13/10 | |||
| 151.405 | |||
| | |||
|- | |||
| | |||
| 13/7 | |||
| 153.100 | |||
| | |||
|- | |||
| | |||
| 7/5 | |||
| 154.372 | |||
| | |||
|- | |||
| | |||
| 7/6 | |||
| 155.522 | |||
| | |||
|- | |||
| | |||
| 11/7 | |||
| 156.498 | |||
| | |||
|- | |||
| 3\23 | |||
| | |||
| 156.522 | |||
| 23bcf val | |||
|- | |||
| | |||
| 5/3 | |||
| 157.821 | |||
| | |||
|- | |||
| 5\38 | |||
| | |||
| 157.895 | |||
| 38bceff val | |||
|- | |||
| 7\53 | |||
| | |||
| 158.491 | |||
| 53bcefff val | |||
|- | |||
| | |||
| 15/13 | |||
| 158.710 | |||
| | |||
|- | |||
| | |||
| 7/4 | |||
| 159.019 | |||
| 7-, 9-, 11-, 13- and 15-odd-limit minimax | |||
|- | |||
| | |||
| 13/9 | |||
| 159.154 | |||
| | |||
|- | |||
| 2\15 | |||
| | |||
| 160.000 | |||
| Upper bound of 7-odd-limit diamond monotone<br>9- and 11-odd-limit diamond monotone (singleton) | |||
|- | |||
| | |||
| 11/8 | |||
| 162.171 | |||
| | |||
|- | |||
| | |||
| 5/4 | |||
| 162.737 | |||
| 5-odd-limit minimax | |||
|- | |||
| | |||
| 15/8 | |||
| 163.966 | |||
| | |||
|- | |||
| | |||
| 11/10 | |||
| 165.004 | |||
| | |||
|- | |||
| | |||
| 15/11 | |||
| 165.762 | |||
| | |||
|- | |||
| | |||
| 3/2 | |||
| 166.015 | |||
| | |||
|- | |||
| | |||
| 11/9 | |||
| 173.704 | |||
| | |||
|- | |||
| | |||
| 13/8 | |||
| 179.736 | |||
| | |||
|- | |||
| | |||
| 9/5 | |||
| 182.404 | |||
| | |||
|} | |||
[[Category:Opossum| ]] <!-- main article --> | |||
[[Category:Rank-2 temperaments]] | |||
[[Category:Exotemperaments]] | |||
[[Category:Porcupine family]] | |||
[[Category:Trienstonic clan]] | |||
[[Category:Starling temperaments]] |