121ed4

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← 119ed4 121ed4 123ed4 →
Prime factorization 112
Step size 19.8347¢ 
Octave 61\121ed4 (1209.92¢)
Twelfth 96\121ed4 (1904.13¢)
Consistency limit 1
Distinct consistency limit 1

121 equal divisions of the 4th harmonic (abbreviated 121ed4) is a nonoctave tuning system that divides the interval of 4/1 into 121 equal parts of about 19.8 ¢ each. Each step represents a frequency ratio of 41/121, or the 121st root of 4.

Intervals

Steps Cents Approximate ratios
0 0 1/1
1 19.8
2 39.7
3 59.5 30/29
4 79.3 22/21, 45/43
5 99.2
6 119
7 138.8
8 158.7 23/21, 34/31
9 178.5 41/37
10 198.3 37/33
11 218.2 17/15
12 238 31/27, 39/34, 47/41
13 257.9
14 277.7 27/23
15 297.5
16 317.4
17 337.2 45/37
18 357 43/35
19 376.9 41/33
20 396.7 39/31, 49/39
21 416.5
22 436.4 9/7
23 456.2 13/10
24 476
25 495.9
26 515.7 31/23
27 535.5 15/11
28 555.4
29 575.2
30 595 31/22
31 614.9
32 634.7 13/9
33 654.5
34 674.4 31/21
35 694.2
36 714
37 733.9 29/19
38 753.7 17/11
39 773.6
40 793.4 49/31
41 813.2
42 833.1 34/21
43 852.9
44 872.7
45 892.6
46 912.4 22/13, 39/23
47 932.2
48 952.1
49 971.9
50 991.7 39/22
51 1011.6
52 1031.4 49/27
53 1051.2
54 1071.1 13/7
55 1090.9
56 1110.7 19/10
57 1130.6
58 1150.4
59 1170.2
60 1190.1
61 1209.9
62 1229.8
63 1249.6 35/17
64 1269.4
65 1289.3
66 1309.1 49/23
67 1328.9
68 1348.8
69 1368.6
70 1388.4 29/13
71 1408.3
72 1428.1
73 1447.9 30/13
74 1467.8 7/3
75 1487.6
76 1507.4
77 1527.3
78 1547.1 22/9
79 1566.9 47/19
80 1586.8
81 1606.6 43/17
82 1626.4
83 1646.3
84 1666.1 34/13
85 1686 45/17
86 1705.8
87 1725.6
88 1745.5
89 1765.3
90 1785.1
91 1805
92 1824.8 43/15
93 1844.6 29/10
94 1864.5
95 1884.3
96 1904.1
97 1924
98 1943.8
99 1963.6
100 1983.5 22/7
101 2003.3 35/11
102 2023.1
103 2043
104 2062.8
105 2082.6 10/3
106 2102.5
107 2122.3
108 2142.1 31/9
109 2162
110 2181.8
111 2201.7
112 2221.5
113 2241.3
114 2261.2
115 2281
116 2300.8 34/9
117 2320.7
118 2340.5
119 2360.3 43/11
120 2380.2
121 2400

Harmonics

Approximation of harmonics in 121ed4
Harmonic 2 3 4 5 6 7 8 9 10 11 12
Error Absolute (¢) +9.92 +2.18 +0.00 -9.45 -7.74 +3.07 +9.92 +4.35 +0.46 -5.86 +2.18
Relative (%) +50.0 +11.0 +0.0 -47.7 -39.0 +15.5 +50.0 +22.0 +2.3 -29.6 +11.0
Steps
(reduced)
61
(61)
96
(96)
121
(0)
140
(19)
156
(35)
170
(49)
182
(61)
192
(71)
201
(80)
209
(88)
217
(96)
Approximation of harmonics in 121ed4
Harmonic 13 14 15 16 17 18 19 20 21 22 23
Error Absolute (¢) +2.45 -6.84 -7.28 +0.00 -5.78 -5.56 +0.01 -9.45 +5.25 +4.05 +6.44
Relative (%) +12.3 -34.5 -36.7 +0.0 -29.2 -28.0 +0.0 -47.7 +26.5 +20.4 +32.5
Steps
(reduced)
224
(103)
230
(109)
236
(115)
242
(0)
247
(5)
252
(10)
257
(15)
261
(19)
266
(24)
270
(28)
274
(32)