49edo
| ← 48edo | 49edo | 50edo → |
The 49 equal divisions of the octave (49edo), or the 49(-tone) equal temperament (49tet, 49et) when viewed from a regular temperament perspective, divides the octave into 49 equal parts of about 24.5 cents each.
Theory
49edo is very much on the sharp side of things, with sharp tunings of harmonics 3 (it is the first square equal division with a "real" 3 of step coprime to its cardinality), 5, 7, and 11. It is the optimal patent val for superpyth temperament in the 7- and 11-limit, archytas (7-limit) and ares (11-limit) planar temperaments and almost identical to the e-based analog of Lucy tuning. It tempers out 64/63, 245/243 and 3125/3087 in the 7-limit, and 100/99 and 1375/1372 in the 11-limit.
Prime harmonics
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Intervals
| # | Cents | Approximate Ratios (*) | Notation |
|---|---|---|---|
| 0 | 0.000 | 1/1 | D |
| 1 | 24.490 | 50/49 | ^D |
| 2 | 48.980 | 81/80, 28/27, 36/35, 49/48 | Eb/^^D |
| 3 | 73.469 | 25/24, 22/21, 33/32 | ^Eb/^^^D |
| 4 | 97.959 | 16/15, 21/20 | ^^Eb/Fb/vvvD# |
| 5 | 122.449 | 15/14 | ^^^Eb/vvD# |
| 6 | 146.939 | 12/11 | vvvE/vD# |
| 7 | 171.429 | 10/9, 11/10 | vvE/D# |
| 8 | 195.918 | 28/25 | vE |
| 9 | 220.408 | 9/8, 8/7 | E |
| 10 | 244.898 | 125/108, 144/125 | ^E/vF |
| 11 | 269.388 | 7/6 | F |
| 12 | 293.878 | 25/21, 33/28 | ^F |
| 13 | 318.367 | 6/5 | ^^F/Gb |
| 14 | 342.857 | 11/9 | ^^^F/^Gb |
| 15 | 367.347 | 27/22 | vvvF#/^^Gb |
| 16 | 391.837 | 5/4 | vvF#/E# |
| 17 | 416.327 | 14/11 | vF# |
| 18 | 440.816 | 9/7 | F# |
| 19 | 465.306 | 125/96, 162/125 | ^F# |
| 20 | 489.796 | 4/3, 21/16 | G |
| 21 | 514.286 | 75/56 | ^G/vAb |
| 22 | 538.776 | 27/20, 15/11 | Ab/^^G |
| 23 | 563.265 | 11/8 | ^Ab/^^^G |
| 24 | 587.755 | 7/5 | ^^Ab/vvvG# |
| 25 | 612.245 | 10/7 | vvG#/^^^Ab |
| 26 | 636.735 | 16/11 | vG#/vvvA |
| 27 | 661.244 | 40/27, 22/15 | G#/vvA |
| 28 | 685.714 | 112/75 | vA/^G# |
| 29 | 710.204 | 3/2, 32/21 | A |
| 30 | 734.694 | 125/81, 192/125 | ^A/vBb |
| 31 | 759.184 | 14/9 | Bb/^^A |
| 32 | 783.673 | 11/7 | ^Bb/vCb/^^^A |
| 33 | 808.163 | 8/5 | Cb/^^Bb/vvvA# |
| 34 | 832.653 | 44/27 | ^^^Bb/^Cb/vvA# |
| 35 | 857.143 | 18/11 | vvvB/^^Cb/vA# |
| 36 | 881.633 | 5/3 | vvB/^^^Cb/A# |
| 37 | 906.122 | 42/25, 56/33 | vB/vvvC |
| 38 | 930.612 | 12/7 | B/vvC |
| 39 | 955.102 | 125/72, 216/125 | ^B/vC |
| 40 | 979.592 | 16/9, 7/4 | C/^^B |
| 41 | 1004.082 | 25/14 | ^C/^^^B |
| 42 | 1028.571 | 9/5, 20/11 | ^^C/vvvB#/Db |
| 43 | 1053.061 | 11/6 | ^^^C/vvB#/^Db |
| 44 | 1077.551 | 28/15 | vvvC#/vB#/^^Db |
| 45 | 1102.041 | 15/8, 40/21 | vvC#/B#/^^^Db |
| 46 | 1126.531 | 48/25, 21/11, 64/33 | vC#/vvvD |
| 47 | 1151.020 | 160/81, 27/14, 35/18, 96/49 | C#/vvD |
| 48 | 1175.510 | 49/25 | vD |
| 49 | 1200.000 | 2/1 | D |
(*) Based on 49edo's 11-limit patent val ⟨49 78 114 138 170] mapping
Acoustic ϕ and ϕϕ-1
49edo has a very close approximation of both acoustic phi and ϕϕ-1, a kind of logarithmic phi that divides acoustic phi logarithmically by phi (instead of dividing 2/1 logarithmically by phi, in the case of normal logarithmic phi).
ϕϕ-1 has interesting applications as Metallic MOS, and in particular the fractal-like possibilities of self-similar subdivision of musical scales within acoustic phi.
Not until 592 do we find a better EDO in terms of relative error on these two intervals.
| Interval | Error (abs, ¢) | #\49 |
|---|---|---|
| ϕ / ϕϕ-1 = ϕ(2-ϕ) | 0.155 | 13 |
| ϕ | -0.437 | 34 |
| ϕϕ-1 | -0.592 | 21 |
Regular temperament properties
| Subgroup | Comma list | Mapping | Optimal 8ve stretch (¢) |
Tuning error | |
|---|---|---|---|---|---|
| Absolute (¢) | Relative (%) | ||||
| 2.3 | [78 -49⟩ | [⟨49 78]] | -2.60 | 2.60 | 10.62 |
| 2.3.5 | 15625/15552, 20480/19683 | [⟨49 78 114]] | -2.53 | 2.12 | 8.69 |
| 2.3.5.7 | 64/63, 245/243, 3125/3087 | [⟨49 78 114 138]] | -2.85 | 1.92 | 7.87 |
| 2.3.5.7.11 | 64/63, 100/99, 245/243, 1331/1323 | [⟨49 78 114 138 170]] | -2.97 | 1.74 | 7.11 |
Rank-2 temperaments
| Periods per octave |
Generator | Temperaments |
|---|---|---|
| 1 | 1\49 | Sengagen |
| 1 | 4\49 | Passion |
| 1 | 6\49 | Bohpier |
| 1 | 8\49 | Didacus |
| 1 | 11\49 | Infraorwell |
| 1 | 12\49 | Kleiboh |
| 1 | 13\49 | Hanson / catalan |
| 1 | 16\49 | Magus |
| 1 | 17\49 | Sqrtphi |
| 1 | 18\49 | Clyde |
| 1 | 19\49 | Semisept |
| 1 | 20\49 | Archy / superpyth |
| 7 | 20\49 | Sevond Seville |