User:Overthink/41edo well temperament: Difference between revisions
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A highly notable tuning system is 41edo, which is [[distinctly consistent]] and [[consistent to distance]] 2 in the 9-odd-limit, consistent to the [[15-odd-limit]], and is overall great for its size in all prime | A highly notable tuning system is [[41edo]], which is [[distinctly consistent]] and [[consistent to distance]] 2 in the 9-odd-limit, consistent to the [[15-odd-limit]], and is overall great for its size in all [[prime limit]]s up to [[13-limit|13]]. However, the accuracy of some intervals is debateable, so we will construct a well temperament in order to fix this issue. | ||
== The chain of fifths == | == The chain of fifths == | ||
Our well temperament will be | Our well temperament will be based on a chain of fifths, and we will target harmonics [[5/1|5]], [[7/1|7]], [[11/1|11]], and [[13/1|13]]. In 41edo, these prime harmonics are mapped as follows (corresponding to [[andromeda]] temperament if the fifths are all the same): | ||
{| class="wikitable right-all center-1" | {| class="wikitable right-all center-1" | ||
|- | |- | ||
! Prime | ! Prime | ||
! Fifths | ! Fifths down | ||
|- | |- | ||
| 5 | | 5 | ||
| -8 | | -8 | ||
|- | |- | ||
| 7 | | 7 | ||
| -14 | | -14 | ||
|- | |- | ||
| 11 | | 11 | ||
| -18 | | -18 | ||
|- | |- | ||
| 13 | | 13 | ||
| -21 | | -21 | ||
|} | |} | ||
Prime 5 is closest to the root on the circle of fifths; being only 8 | Prime 5 is closest to the root on the circle of fifths; being only 8 fifths down due to 41edo tempering out the [[schisma]]. We build our well temperament down the chain of fifths to reach a more accurate prime 5, using slightly flat fifths of 701.792{{Cent}}, or 1/12 schisma flat of just. We continue this chain of schismic fifths down until we reach -12 fifths, or an exact [[160/81]]. We then stack down 12 [[parapyth]] fifths of 704.002{{C}} to obtain accurate approximations of harmonics 7, 11, and 13. Finally, the remaining fifths are all 1/12-schisma flat, giving a total of 29 schismic fifths and 12 parapyth fifths. | ||
{| class="wikitable | == Intervals == | ||
{| class="wikitable center-1 right-all" | |||
! Steps | |||
! Cents (ET) | |||
! Cents (WT) | |||
! Nearest Ratio | |||
|- | |- | ||
| 0 | | 0 | ||
| | | 0.000 | ||
| | | 0.000 | ||
| [[1/1]] | |||
|- | |- | ||
| 1 | | 1 | ||
| | | 29.268 | ||
| | | 21.506 | ||
| | | [[81/80]] | ||
|- | |- | ||
| 2 | | 2 | ||
| | | 58.537 | ||
| | | 58.483 | ||
| | | [[33/32]] | ||
|- | |- | ||
| 3 | | 3 | ||
| | | 87.805 | ||
| | | 91.039 | ||
| | | [[135/128]] | ||
|- | |- | ||
| 4 | | 4 | ||
| | | 117.073 | ||
| | | 112.545 | ||
| | | [[16/15]] | ||
|- | |- | ||
| 5 | | 5 | ||
| | | 146.341 | ||
| | | 138.472 | ||
| | | [[13/12]] | ||
|- | |- | ||
| 6 | | 6 | ||
| | | 175.610 | ||
| | | 182.078 | ||
| | | [[10/9]] | ||
|- | |- | ||
| 7 | | 7 | ||
| | | 204.878 | ||
| | | 203.584 | ||
| | | [[9/8]] | ||
|- | |- | ||
| 8 | | 8 | ||
| | | 234.146 | ||
| | | 225.091 | ||
| | | [[256/225]] | ||
|- | |- | ||
| 9 | | 9 | ||
| | | 263.415 | ||
| | | 266.487 | ||
| | | [[7/6]] | ||
|- | |- | ||
| 10 | | 10 | ||
| | | 292.683 | ||
| | | 294.623 | ||
| | | [[32/27]] | ||
|- | |- | ||
| 11 | | 11 | ||
| | | 321.951 | ||
| | | 316.130 | ||
| | | [[6/5]] | ||
|- | |- | ||
| 12 | | 12 | ||
| | | 351.220 | ||
| | | 346.476 | ||
| | | [[11/9]] | ||
|- | |- | ||
| 13 | | 13 | ||
| | | 380.488 | ||
| | | 385.662 | ||
| | | [[5/4]] | ||
|- | |- | ||
| 14 | | 14 | ||
| | | 409.756 | ||
| | | 407.169 | ||
| | | [[81/64]] | ||
|- | |- | ||
| 15 | | 15 | ||
| | | 439.024 | ||
| | | 428.675 | ||
| | | [[32/25]] | ||
|- | |- | ||
| 16 | | 16 | ||
| | | 468.293 | ||
| | | 474.492 | ||
| | | [[21/16]] | ||
|- | |- | ||
| 17 | | 17 | ||
| | | 497.561 | ||
| 498. | | 498.208 | ||
| | | [[4/3]] | ||
|- | |- | ||
| 18 | | 18 | ||
| | | 526.829 | ||
| | | 519.714 | ||
| | | [[27/20]] | ||
|- | |- | ||
| 19 | | 19 | ||
| | | 556.098 | ||
| | | 554.480 | ||
| | | [[11/8]] | ||
|- | |- | ||
| 20 | | 20 | ||
| | | 585.366 | ||
| | | 589.247 | ||
| | | [[45/32]] | ||
|- | |- | ||
| 21 | | 21 | ||
| | | 614.634 | ||
| | | 610.753 | ||
| | | [[64/45]] | ||
|- | |- | ||
| 22 | | 22 | ||
| | | 643.902 | ||
| | | 634.469 | ||
| | | [[13/9]] | ||
|- | |- | ||
| 23 | | 23 | ||
| | | 673.171 | ||
| | | 680.286 | ||
| | | [[40/27]] | ||
|- | |- | ||
| 24 | | 24 | ||
| | | 702.439 | ||
| | | 701.792 | ||
| | | [[3/2]] | ||
|- | |- | ||
| 25 | | 25 | ||
| | | 731.707 | ||
| | | 723.298 | ||
| | | [[243/160]] | ||
|- | |- | ||
| 26 | | 26 | ||
| | | 760.976 | ||
| | | 762.485 | ||
| | | [[14/9]] | ||
|- | |- | ||
| 27 | | 27 | ||
| | | 790.244 | ||
| | | 792.831 | ||
| | | [[128/81]] | ||
|- | |- | ||
| 28 | | 28 | ||
| | | 819.512 | ||
| | | 814.338 | ||
| | | [[8/5]] | ||
|- | |- | ||
| 29 | | 29 | ||
| | | 848.780 | ||
| | | 842.474 | ||
| | | [[13/8]] | ||
|- | |- | ||
| 30 | | 30 | ||
| | | 878.049 | ||
| | | 883.870 | ||
| | | [[5/3]] | ||
|- | |- | ||
| 31 | | 31 | ||
| | | 907.317 | ||
| | | 905.377 | ||
| | | [[27/16]] | ||
|- | |- | ||
| 32 | | 32 | ||
| | | 936.585 | ||
| | | 926.883 | ||
| | | [[128/75]] | ||
|- | |- | ||
| 33 | | 33 | ||
| | | 965.854 | ||
| | | 970.489 | ||
| | | [[7/4]] | ||
|- | |- | ||
| 34 | | 34 | ||
| | | 995.122 | ||
| | | 996.416 | ||
| | | [[16/9]] | ||
|- | |- | ||
| 35 | | 35 | ||
| | | 1024.390 | ||
| | | 1017.922 | ||
| | | [[9/5]] | ||
|- | |- | ||
| 36 | | 36 | ||
| | | 1053.659 | ||
| | | 1050.478 | ||
| | | [[11/6]] | ||
|- | |- | ||
| 37 | | 37 | ||
| | | 1082.927 | ||
| | | 1087.455 | ||
| | | [[15/8]] | ||
|- | |- | ||
| 38 | | 38 | ||
| | | 1112.195 | ||
| | | 1108.961 | ||
| | | [[243/128]] | ||
|- | |- | ||
| 39 | | 39 | ||
| | | 1141.463 | ||
| | | 1130.467 | ||
| | | [[48/25]] | ||
|- | |- | ||
| 40 | | 40 | ||
| | | 1170.732 | ||
| | | 1178.494 | ||
| | | [[160/81]] | ||
|- | |- | ||
| 41 | | 41 | ||
| | | 1200.000 | ||
| 1200 | | 1200.000 | ||
| | | [[2/1]] | ||
|} | |} | ||
As you can see, this well temperament approximates many 5-limit ratios of low-to-medium complexity with accuracy, while also having a good approximation of the higher limits. | |||