207edo: Difference between revisions
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Review |
→Regular temperament properties: review +1 |
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| Line 23: | Line 23: | ||
|- | |- | ||
| 2.3 | | 2.3 | ||
| {{monzo|-328 207}} | | {{monzo| -328 207 }} | ||
| {{ | | {{mapping| 207 328 }} | ||
| +0.1595 | | +0.1595 | ||
| 0.1596 | | 0.1596 | ||
| Line 30: | Line 30: | ||
|- | |- | ||
| 2.3.5 | | 2.3.5 | ||
| 32805/32768, {{monzo|2 31 -22}} | | 32805/32768, {{monzo| 2 31 -22 }} | ||
| {{ | | {{mapping| 207 328 481 }} | ||
| -0.1942 | | -0.1942 | ||
| 0.5166 | | 0.5166 | ||
| Line 37: | Line 37: | ||
|- | |- | ||
| 2.3.5.7 | | 2.3.5.7 | ||
| 6144/6125, 19683/19600, | | 6144/6125, 19683/19600, 50421/50000 | ||
| {{ | | {{mapping| 207 328 481 581 }} | ||
| -0.0825 | | -0.0825 | ||
| 0.4874 | | 0.4874 | ||
| Line 44: | Line 44: | ||
|- | |- | ||
| 2.3.5.7.11 | | 2.3.5.7.11 | ||
| 441/440, 3388/3375, | | 441/440, 3388/3375, 6144/6125, 19683/19600 | ||
| {{ | | {{mapping| 207 328 481 581 716 }} | ||
| -0.0317 | | -0.0317 | ||
| 0.4477 | | 0.4477 | ||
| Line 52: | Line 52: | ||
| 2.3.5.7.11.13 | | 2.3.5.7.11.13 | ||
| 351/350, 441/440, 676/675, 847/845, 3584/3575 | | 351/350, 441/440, 676/675, 847/845, 3584/3575 | ||
| {{ | | {{mapping| 207 328 481 581 716 766 }} | ||
| -0.0287 | | -0.0287 | ||
| 0.4087 | | 0.4087 | ||
| Line 58: | Line 58: | ||
|- | |- | ||
| 2.3.5.7.11.13.17 | | 2.3.5.7.11.13.17 | ||
| 441/440, 561/560, 676/675, | | 351/350, 441/440, 561/560, 676/675, 847/845, 1089/1088 | ||
| {{ | | {{mapping| 207 328 481 581 716 766 846 }} | ||
| -0.0034 | | -0.0034 | ||
| 0.3834 | | 0.3834 | ||
Revision as of 10:49, 13 April 2024
| ← 206edo | 207edo | 208edo → |
Theory
207et tempers out 32805/32768 (schisma) in the 5-limit, 6144/6125 and 19683/19600 in the 7-limit, 441/440 and 43923/43904 in the 11-limit, and 351/350, 676/675, 729/728, 847/845, 1716/1715 in the 13-limit. It serves as a tuning in the 11- and 13-limit for the swetneus temperament. It is significantly more accurate on the 2.3.7.11.13 subgroup, a favorite of many people, and one which contains both 729/728 and 10648/10647, which it tempers out.
Prime harmonics
| Harmonic | 2 | 3 | 5 | 7 | 11 | 13 | 17 | 19 | 23 | 29 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Error | Absolute (¢) | +0.00 | -0.51 | +2.09 | -0.71 | -0.59 | +0.05 | -0.61 | -1.86 | -2.19 | +2.31 | +2.79 |
| Relative (%) | +0.0 | -8.7 | +36.1 | -12.2 | -10.2 | +0.9 | -10.5 | -32.1 | -37.7 | +39.8 | +48.1 | |
| Steps (reduced) |
207 (0) |
328 (121) |
481 (67) |
581 (167) |
716 (95) |
766 (145) |
846 (18) |
879 (51) |
936 (108) |
1006 (178) |
1026 (198) | |
Subsets and supersets
Since 207 factors into 32 × 23, 207edo has subset edos 3, 9, 23, and 69.
Regular temperament properties
| Subgroup | Comma List | Mapping | Optimal 8ve Stretch (¢) |
Tuning Error | |
|---|---|---|---|---|---|
| Absolute (¢) | Relative (%) | ||||
| 2.3 | [-328 207⟩ | [⟨207 328]] | +0.1595 | 0.1596 | 2.75 |
| 2.3.5 | 32805/32768, [2 31 -22⟩ | [⟨207 328 481]] | -0.1942 | 0.5166 | 8.91 |
| 2.3.5.7 | 6144/6125, 19683/19600, 50421/50000 | [⟨207 328 481 581]] | -0.0825 | 0.4874 | 8.41 |
| 2.3.5.7.11 | 441/440, 3388/3375, 6144/6125, 19683/19600 | [⟨207 328 481 581 716]] | -0.0317 | 0.4477 | 7.72 |
| 2.3.5.7.11.13 | 351/350, 441/440, 676/675, 847/845, 3584/3575 | [⟨207 328 481 581 716 766]] | -0.0287 | 0.4087 | 7.05 |
| 2.3.5.7.11.13.17 | 351/350, 441/440, 561/560, 676/675, 847/845, 1089/1088 | [⟨207 328 481 581 716 766 846]] | -0.0034 | 0.3834 | 6.61 |
Rank-2 temperaments
| Periods per 8ve |
Generator* | Cents* | Associated Ratio* |
Temperaments |
|---|---|---|---|---|
| 1 | 25\207 | 144.93 | 49/45 | Swetneus |
| 1 | 43\207 | 249.28 | 15/13 | Hemischis |
| 1 | 86\207 | 498.55 | 4/3 | Helmholtz |
* octave-reduced form, reduced to the first half-octave, and minimal form in parentheses if it is distinct