3-limit: Difference between revisions

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3-limit intervals up to [[odd-limit]] 19683:
3-limit intervals up to [[odd-limit]] 19683:
{| class="wikitable"
{| class="wikitable center-1 right-3"
|-
|-
! Ratio
! Ratio
! cents
! [[Monzo]]
! Size ([[cent|¢]])
! colspan="2" | [[Kite's color notation|Color name]]
! colspan="2" | [[Kite's color notation|Color name]]
! colspan="2" | Interval category
! colspan="2" | Interval category
|-
|-
| [[1/1]]
| [[1/1]]
| {{Monzo| 0 }}
| 0.000
| 0.000
| w1
| w1
Line 21: Line 23:
|-
|-
| [[2187/2048]]
| [[2187/2048]]
| {{Monzo| -11 7 }}
| 113.685
| 113.685
| Lw1
| Lw1
Line 28: Line 31:
|-
|-
| [[256/243]]
| [[256/243]]
| {{Monzo| 8 -5 }}
| 90.225
| 90.225
| sw2
| sw2
Line 35: Line 39:
|-
|-
| [[9/8]]
| [[9/8]]
| {{Monzo| -3 2 }}
| 203.910
| 203.910
| w2
| w2
Line 42: Line 47:
|-
|-
| [[19683/16384]]
| [[19683/16384]]
| {{Monzo| -14 9 }}
| 317.595
| 317.595
| Lw2
| Lw2
Line 49: Line 55:
|-
|-
| [[32/27]]
| [[32/27]]
| {{Monzo| 5 -3 }}
| 294.135
| 294.135
| w3
| w3
Line 56: Line 63:
|-
|-
| [[81/64]]
| [[81/64]]
| {{Monzo| -6 4 }}
| 407.820
| 407.820
| Lw3
| Lw3
Line 63: Line 71:
|-
|-
| [[8192/6561]]
| [[8192/6561]]
| {{Monzo| 13 -8 }}
| 384.360
| 384.360
| sw4
| sw4
Line 70: Line 79:
|-
|-
| [[4/3]]
| [[4/3]]
| {{Monzo| 2 1 }}
| 498.045
| 498.045
| w4
| w4
Line 77: Line 87:
|-
|-
| [[729/512]]
| [[729/512]]
| {{Monzo| -9 6 }}
| 611.730
| 611.730
| Lw4
| Lw4
Line 84: Line 95:
|-
|-
| [[1024/729]]
| [[1024/729]]
| {{Monzo| 10 -6 }}
| 588.270
| 588.270
| sw5
| sw5
Line 91: Line 103:
|-
|-
| [[3/2]]
| [[3/2]]
| {{Monzo| -1 1 }}
| 701.955
| 701.955
| w5
| w5
Line 98: Line 111:
|-
|-
| [[6561/4096]]
| [[6561/4096]]
| {{Monzo| -12 8 }}
| 815.640
| 815.640
| Lw5
| Lw5
Line 105: Line 119:
|-
|-
| [[128/81]]
| [[128/81]]
| {{Monzo| 7 -4 }}
| 792.180
| 792.180
| sw6
| sw6
Line 112: Line 127:
|-
|-
| [[27/16]]
| [[27/16]]
| {{Monzo| -4 3 }}
| 905.865
| 905.865
| w6
| w6
Line 119: Line 135:
|-
|-
| [[32768/19683]]
| [[32768/19683]]
| {{Monzo| 15 -9 }}
| 882.405
| 882.405
| sw7
| sw7
Line 126: Line 143:
|-
|-
| [[16/9]]
| [[16/9]]
| {{Monzo| 4 -2 }}
| 996.090
| 996.090
| w7
| w7
Line 133: Line 151:
|-
|-
| [[243/128]]
| [[243/128]]
| {{Monzo| -7 5 }}
| 1109.775
| 1109.775
| Lw7
| Lw7
Line 140: Line 159:
|-
|-
| [[4096/2187]]
| [[4096/2187]]
| {{Monzo| 12 -7 }}
| 1086.315
| 1086.315
| sw8
| sw8
Line 147: Line 167:
|-
|-
| [[2/1]]
| [[2/1]]
| {{Monzo| 1 }}
| 1200.000
| 1200.000
| w8
| w8

Revision as of 18:10, 25 October 2020

A 3-limit interval is either an integer whose only prime factors are 2 and 3, the reciprocal of such an integer, the ratio of a power of 2 to a power of 3, or the ratio of a power of 3 to a power of 2. All 3-limit intervals can be written as 2^a 3^b, where a and b can be any (positive, negative or zero) integer. Some examples of 3-limit intervals are 3/2, 4/3, 9/8. Confining intervals to the 3-limit is known as Pythagorean tuning, and the Pythagorean tuning used in Europe during the Middle Ages is seed out of which grew the common-practice tradition of Western music.

EDOs which do relatively well at approximating 3-limit intervals can be found as the denominators of the convergents and semiconvergents of the continued fraction for the logarithm of 3 base 2. These are 1, 2, 3, 5, 7, 12, 17, 29, 41, 53, 94, 147, 200, 253, 306, ...

Another approach is to find EDOs which have more accurate 3 than all smaller EDOs. This results in 1, 2, 3, 5, 7, 12, 29, 41, 53, 200, 253, 306, 359, 665, 8286, 8951, 9616, 10281, 10946, 11611, 12276, 12941, 13606, 14271, 14936, 15601, 31867, ...

3-limit intervals up to odd-limit 19683:

Ratio Monzo Size (¢) Color name Interval category
1/1 [0 0.000 w1 wa unison unison C
2187/2048 [-11 7 113.685 Lw1 large wa 1sn aug. unison C#
256/243 [8 -5 90.225 sw2 small wa 2nd minor 2nd Db
9/8 [-3 2 203.910 w2 wa 2nd major 2nd D
19683/16384 [-14 9 317.595 Lw2 large wa 2nd aug. 2nd D#
32/27 [5 -3 294.135 w3 wa 3rd minor 3rd Eb
81/64 [-6 4 407.820 Lw3 large wa 3rd major 3rd E
8192/6561 [13 -8 384.360 sw4 small wa 4th dim. fourth Fb
4/3 [2 1 498.045 w4 wa 4th fourth F
729/512 [-9 6 611.730 Lw4 large wa 4th aug. fourth F#
1024/729 [10 -6 588.270 sw5 small wa 5th dim. fifth Gb
3/2 [-1 1 701.955 w5 wa 5th fifth G
6561/4096 [-12 8 815.640 Lw5 large wa 5th aug. fifth G#
128/81 [7 -4 792.180 sw6 small wa 6th minor 6th Ab
27/16 [-4 3 905.865 w6 wa 6th major 6th A
32768/19683 [15 -9 882.405 sw7 small wa 7th dim. 7th Bbb
16/9 [4 -2 996.090 w7 wa 7th minor 7th Bb
243/128 [-7 5 1109.775 Lw7 large wa 7th major 7th B
4096/2187 [12 -7 1086.315 sw8 small wa 8ve dim. octave Cb
2/1 [1 1200.000 w8 wa 8ve octave C

See also