74edo
← 73edo | 74edo | 75edo → |
74 equal divisions of the octave (abbreviated 74edo or 74ed2), also called 74-tone equal temperament (74tet) or 74 equal temperament (74et) when viewed under a regular temperament perspective, is the tuning system that divides the octave into 74 equal parts of about 16.2 ¢ each. Each step represents a frequency ratio of 21/74, or the 74th root of 2.
It is most notable as a meantone tuning, tempering out 81/80 in the 5-limit; 81/80 and 126/125 (and hence 225/224) in the 7-limit; 99/98, 176/175 and 441/440 in the 11-limit; and 144/143 and 847/845 in the 13-limit. Discarding 847/845 from that gives 13-limit meantone, aka 13-limit huygens, for which 74edo gives the optimal patent val; and discarding 144/143 gives a 13-limit 62&74 temperament with half-octave period and two parallel tracks of meantone.
Harmonic | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 17 | 19 | 21 | 23 | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Error | absolute (¢) | -4.66 | +2.88 | +4.15 | +6.90 | +0.03 | +2.72 | -1.78 | -7.66 | -5.62 | -0.51 | +4.16 |
relative (%) | -29 | +18 | +26 | +43 | +0 | +17 | -11 | -47 | -35 | -3 | +26 | |
Steps (reduced) |
117 (43) |
172 (24) |
208 (60) |
235 (13) |
256 (34) |
274 (52) |
289 (67) |
302 (6) |
314 (18) |
325 (29) |
335 (39) |
74 tunes 11 only 1/30 of a cent sharp, and 13 2.7 cents sharp, making it a distinctly interesting choice for higher-limit meantone.
Intervals
Steps | Cents | Ups and downs notation | Approximate ratios |
---|---|---|---|
0 | 0 | D | 1/1 |
1 | 16.2162 | ↑D, ↓E♭♭ | 78/77 |
2 | 32.4324 | ↑↑D, E♭♭ | 45/44, 50/49, 56/55, 64/63, 65/64 |
3 | 48.6486 | ↑3D, ↓4E♭ | 33/32, 40/39, 77/75 |
4 | 64.8649 | ↑4D, ↓3E♭ | 26/25, 80/77 |
5 | 81.0811 | D♯, ↓↓E♭ | 21/20, 22/21 |
6 | 97.2973 | ↑D♯, ↓E♭ | 52/49, 55/52 |
7 | 113.514 | ↑↑D♯, E♭ | 15/14, 16/15 |
8 | 129.73 | ↑3D♯, ↓4E | 14/13 |
9 | 145.946 | ↑4D♯, ↓3E | 12/11 |
10 | 162.162 | D𝄪, ↓↓E | 11/10 |
11 | 178.378 | ↑D𝄪, ↓E | |
12 | 194.595 | E | 28/25, 55/49 |
13 | 210.811 | ↑E, ↓F♭ | 44/39 |
14 | 227.027 | ↑↑E, F♭ | 8/7, 25/22 |
15 | 243.243 | ↑3E, ↓4F | 15/13 |
16 | 259.459 | ↑4E, ↓3F | 64/55, 65/56 |
17 | 275.676 | E♯, ↓↓F | 75/64 |
18 | 291.892 | ↑E♯, ↓F | 13/11, 77/65 |
19 | 308.108 | F | 25/21 |
20 | 324.324 | ↑F, ↓G♭♭ | 77/64 |
21 | 340.541 | ↑↑F, G♭♭ | 39/32 |
22 | 356.757 | ↑3F, ↓4G♭ | 16/13, 49/40 |
23 | 372.973 | ↑4F, ↓3G♭ | 26/21 |
24 | 389.189 | F♯, ↓↓G♭ | 5/4 |
25 | 405.405 | ↑F♯, ↓G♭ | |
26 | 421.622 | ↑↑F♯, G♭ | 14/11, 32/25 |
27 | 437.838 | ↑3F♯, ↓4G | 77/60 |
28 | 454.054 | ↑4F♯, ↓3G | 13/10 |
29 | 470.27 | F𝄪, ↓↓G | 21/16, 55/42 |
30 | 486.486 | ↑F𝄪, ↓G | 65/49 |
31 | 502.703 | G | 4/3, 75/56 |
32 | 518.919 | ↑G, ↓A♭♭ | 35/26 |
33 | 535.135 | ↑↑G, A♭♭ | 15/11 |
34 | 551.351 | ↑3G, ↓4A♭ | 11/8 |
35 | 567.568 | ↑4G, ↓3A♭ | 39/28 |
36 | 583.784 | G♯, ↓↓A♭ | 7/5, 45/32 |
37 | 600 | ↑G♯, ↓A♭ | 55/39, 78/55 |
38 | 616.216 | ↑↑G♯, A♭ | 10/7, 63/44, 64/45 |
39 | 632.432 | ↑3G♯, ↓4A | 56/39, 75/52 |
40 | 648.649 | ↑4G♯, ↓3A | 16/11 |
41 | 664.865 | G𝄪, ↓↓A | 22/15 |
42 | 681.081 | ↑G𝄪, ↓A | 52/35, 65/44, 77/52 |
43 | 697.297 | A | 3/2 |
44 | 713.514 | ↑A, ↓B♭♭ | |
45 | 729.73 | ↑↑A, B♭♭ | 32/21 |
46 | 745.946 | ↑3A, ↓4B♭ | 20/13, 77/50 |
47 | 762.162 | ↑4A, ↓3B♭ | 65/42 |
48 | 778.378 | A♯, ↓↓B♭ | 11/7, 25/16 |
49 | 794.595 | ↑A♯, ↓B♭ | |
50 | 810.811 | ↑↑A♯, B♭ | 8/5 |
51 | 827.027 | ↑3A♯, ↓4B | 21/13 |
52 | 843.243 | ↑4A♯, ↓3B | 13/8, 80/49 |
53 | 859.459 | A𝄪, ↓↓B | 64/39 |
54 | 875.676 | ↑A𝄪, ↓B | |
55 | 891.892 | B | 42/25 |
56 | 908.108 | ↑B, ↓C♭ | 22/13 |
57 | 924.324 | ↑↑B, C♭ | 75/44 |
58 | 940.541 | ↑3B, ↓4C | 55/32 |
59 | 956.757 | ↑4B, ↓3C | 26/15 |
60 | 972.973 | B♯, ↓↓C | 7/4, 44/25 |
61 | 989.189 | ↑B♯, ↓C | 39/22 |
62 | 1005.41 | C | 25/14 |
63 | 1021.62 | ↑C, ↓D♭♭ | |
64 | 1037.84 | ↑↑C, D♭♭ | 20/11 |
65 | 1054.05 | ↑3C, ↓4D♭ | 11/6 |
66 | 1070.27 | ↑4C, ↓3D♭ | 13/7 |
67 | 1086.49 | C♯, ↓↓D♭ | 15/8, 28/15 |
68 | 1102.7 | ↑C♯, ↓D♭ | 49/26 |
69 | 1118.92 | ↑↑C♯, D♭ | 21/11, 40/21 |
70 | 1135.14 | ↑3C♯, ↓4D | 25/13, 77/40 |
71 | 1151.35 | ↑4C♯, ↓3D | 39/20, 64/33 |
72 | 1167.57 | C𝄪, ↓↓D | 49/25, 55/28, 63/32 |
73 | 1183.78 | ↑C𝄪, ↓D | 77/39 |
74 | 1200 | D | 2/1 |