43edt: Difference between revisions

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'''[[Edt|Division of the third harmonic]] into 43 equal parts''' (43EDT) is related to [[27edo|27 EDO]], but with the 3/1 rather than the 2/1 being just. The octave is about 5.7492 cents compressed and the step size is about 44.2315 cents. It is consistent to the [[9-odd-limit|10-integer-limit]].
=43 EDT=
=43 EDT=


This tuning is related to [[27edo|27edo]] having compressed octaves of 1194.251 cents, a small but significant deviation. This is particularly relevant because 27edo is a "sharp tending" system, and flattening its octaves has been suggested before as an improvement (I think by no less than Ivor Darreg, but I'll have to check that).
This tuning is related to 27EDO having ~5.7 cent octave compression, a small but significant deviation. This is particularly relevant because 27EDO is a "sharp tending" system, and flattening its octaves has been suggested before as an improvement (I think by no less than Ivor Darreg, but I'll have to check that).


However, in addition to its rich octave-based harmony, the 43edt is also a fine tritave-based tuning: with a 7/3 of 1460 cents and such a near perfect 5/3, Bohlen-Pierce harmony is very clear and hearty, as well as capable of extended enharmonic distinctions that [[13edt|13edt]] is not. The 4L+5s MOS has L=7 s=3.
However, in addition to its rich octave-based harmony, the 43EDT is also a fine tritave-based tuning: with a 7/3 of 1460 cents and such a near perfect 5/3, Bohlen-Pierce harmony is very clear and hearty, as well as capable of extended enharmonic distinctions that [[13edt|13EDT]] is not. The 4L+5s MOS has L=7 s=3.


{| class="wikitable"
{| class="wikitable"
|-
|-
! | Degrees
! | degrees
! | Cents
! | cents value
! | corresponding <br>JI intervals
|-
|-
| | 1
| | 1
| | 44.232
| | 44.232
| | 40/39, 39/38
|-
|-
| | 2
| | 2
| | 88.463
| | 88.463
| | [[20/19]]
|-
|-
| | 3
| | 3
| | 132.695
| | 132.695
| | [[27/25]]
|-
|-
| | 4
| | 4
| | 176.926
| | 176.926
| |
|-
|-
| | 5
| | 5
| | 221.158
| | 221.158
| | [[25/22]]
|-
|-
| | 6
| | 6
| | 265.389
| | 265.389
| | ([[7/6]])
|-
|-
| | 7
| | 7
| | 309.621
| | 309.621
| |
|-
|-
| | 8
| | 8
| | 353.852
| | 353.852
| | [[27/22]]
|-
|-
| | 9
| | 9
| | 398.084
| | 398.084
| |
|-
|-
| | 10
| | 10
| | 442.315
| | 442.315
| |
|-
|-
| | 11
| | 11
| | 486.547
| | 486.547
| | (45/34)
|-
|-
| | 12
| | 12
| | 530.778
| | 530.778
| | (34/25)
|-
|-
| | 13
| | 13
| | 575.010
| | 575.010
| | (39/28)
|-
|-
| | 14
| | 14
| | 619.241
| | 619.241
| | ([[10/7]])
|-
|-
| | 15
| | 15
| | 663.473
| | 663.473
| | [[22/15]]
|-
|-
| | 16
| | 16
| | 707.704
| | 707.704
| |
|-
|-
| | 17
| | 17
| | 751.936
| | 751.936
| |
|-
|-
| | 18
| | 18
| | 796.167
| | 796.167
| | [[19/12]]
|-
|-
| | 19
| | 19
| | 840.399
| | 840.399
| | [[13/8]]
|-
|-
| | 20
| | 20
| | 884.630
| | 884.630
| | [[5/3]]
|-
|-
| | 21
| | 21
| | 928.862
| | 928.862
| |
|-
|-
| | 22
| | 22
| | 973.093
| | 973.093
| |
|-
|-
| | 23
| | 23
| | 1017.325
| | 1017.325
| | [[9/5]]
|-
|-
| | 24
| | 24
| | 1061.556
| | 1061.556
| | [[24/13]]
|-
|-
| | 25
| | 25
| | 1105.788
| | 1105.788
| | [[36/19]]
|-
|-
| | 26
| | 26
| | 1150.019
| | 1150.019
| | 68/35
|-
|-
| | 27
| | 27
| | 1194.251
| | 1194.251
| |
|-
|-
| | 28
| | 28
| | 1238.482
| | 1238.482
| | [[45/44|45/22]]
|-
|-
| | 29
| | 29
| | 1282.713
| | 1282.713
| | ([[21/20|21/10]])
|-
|-
| | 30
| | 30
| | 1326.946
| | 1326.946
| | ([[14/13|28/13]])
|-
|-
| | 31
| | 31
| | 1371.177
| | 1371.177
| |
|-
|-
| | 32
| | 32
| | 1415.408
| | 1415.408
| | ([[17/15|34/15]])
|-
|-
| | 33
| | 33
| | 1459.640
| | 1459.640
| |
|-
|-
| | 34
| | 34
| | 1503.871
| | 1503.871
| |
|-
|-
| | 35
| | 35
| | 1548.193
| | 1548.193
| | [[11/9|22/9]]
|-
|-
| | 36
| | 36
| | 1592.334
| | 1592.334
| |
|-
|-
| | 37
| | 37
| | 1636.566
| | 1636.566
| | ([[9/7|18/7]])
|-
|-
| | 38
| | 38
| | 1680.797
| | 1680.797
| | [[33/25|66/25]]
|-
|-
| | 39
| | 39
| | 1725.029
| | 1725.029
| |
|-
|-
| | 40
| | 40
| | 1769.261
| | 1769.261
| | [[25/9]]
|-
|-
| | 41
| | 41
| | 1813.492
| | 1813.492
| | 57/20
|-
|-
| | 42
| | 42
| | 1857.724
| | 1857.724
| | [[19/13|38/13]]
|-
|-
| | 43
| | 43
| | 1901.955
| | 1901.955
| | '''exact [[3/1]]'''
|}
|}


[[Category:edt]]
[[Category:Edt]]
[[Category:tritave]]
[[Category:Edonoi]]