User:BudjarnLambeth/Draft related tunings section: Difference between revisions

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→Octave stretch or compression: useless column if there's only one significant figure
→Octave stretch or compression: as I pointed out before, octave size is way better than step size. Unify to TE and 3 decimal places
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; 36edo
; 36edo
* Step size: 33.333{{c}}, octave size: 1200.0{{c}}  
* Step size: 33.333{{c}}, octave size: 1200.000{{c}}  
{{Harmonics in equal|36|2|1|intervals=integer|columns=11|collapsed=true}}
{{Harmonics in equal|36|2|1|intervals=integer|columns=11|collapsed=true}}
{{Harmonics in equal|36|2|1|intervals=integer|columns=12|start=12|collapsed=true|title=Approximation of harmonics in 36edo (continued)}}
{{Harmonics in equal|36|2|1|intervals=integer|columns=12|start=12|collapsed=true|title=Approximation of harmonics in 36edo (continued)}}
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Pure-octaves 36edo approximates all primes up to 11 within ''15.3{{c}}''.
Pure-octaves 36edo approximates all primes up to 11 within ''15.3{{c}}''.


; [[TE|36et, 11-limit TE tuning]]
; [[TE|36et, 13-limit TE tuning]]
* Step size: 33.287{{c}}, octave size: 1198.3{{c}}
* Step size: 33.304{{c}}, octave size: 1198.929{{c}}
{{Harmonics in cet|33.287|columns=11|collapsed=true|title=Approximation of harmonics in 11-limit TE tuning of 36et}}
{{Harmonics in cet|33.303596|columns=11|collapsed=true|title=Approximation of harmonics in 13-limit TE tuning of 36et}}
{{Harmonics in cet|33.287|columns=12|start=12|collapsed=true|title=Approximation of harmonics in 11-limit TE tuning of 36et (continued)}}
{{Harmonics in cet|33.303596|columns=12|start=12|collapsed=true|title=Approximation of harmonics in 13-limit TE tuning of 36et (continued)}}


Compressing the octave of 36edo by about 2{{c}} results in much improved primes 5 and 11, but much worse primes 7 and 13. This approximates all primes up to 11 within ''9.7{{c}}''. The 11- and 13-limit TE tunings of 36et both do this, as do their respective WE tunings.
Compressing the octave of 36edo by about 2{{c}} results in much improved primes 5 and 11, but much worse primes 7 and 13. This approximates all primes up to 11 within ''9.7{{c}}''. The 11- and 13-limit TE tunings of 36et both do this, as do their respective WE tunings.
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|+ style="white-space: nowrap;" | Comparison of stretched and compressed tunings
|+ style="white-space: nowrap;" | Comparison of stretched and compressed tunings
|-
|-
! rowspan="2" | Tuning !! rowspan="2" | Step size<br>(cents) !! colspan="6" | Prime error (cents)  
! rowspan="2" | Tuning !! rowspan="2" | Octave size<br>(cents) !! colspan="6" | Prime error (cents)  
! rowspan="2" | Mapping of primes 2–13 (steps)
! rowspan="2" | Mapping of primes 2–13 (steps)
|-
|-
Line 108: Line 108:
|-
|-
! 21edf
! 21edf
| 33.426
| 1203.351
| +3.3 || +3.3 || −12.0 || +7.2 || −6.5 || +5.1
| +3.3 || +3.3 || −12.0 || +7.2 || −6.5 || +5.1
| 36, 57, 83, 101, 124, 133
| 36, 57, 83, 101, 124, 133
|-
|-
! 57edt
! 57edt
| 33.368 || +1.2 || 0.0 || +16.6 || +1.3 || −13.7 || −2.6
| 1201.235
| +1.2 || 0.0 || +16.6 || +1.3 || −13.7 || −2.6
| 36, 57, 84, 101, 124, 133
| 36, 57, 84, 101, 124, 133
|-
|-
! 155zpi
! 155zpi
| 33.346
| 1200.587
| +0.6 || −1.0 || +15.1 || −0.5 || −16.0|| −5.0
| +0.6 || −1.0 || +15.1 || −0.5 || −16.0|| −5.0
| 36, 57, 83, 101, 124, 133
| 36, 57, 83, 101, 124, 133
|-
|-
! 36edo
! 36edo
| '''33.333'''
| '''1200.000'''
| '''0.0''' || '''−2.0''' || '''+13.7''' || '''−2.2''' || '''+15.3''' || '''−7.2'''
| '''0.0''' || '''−2.0''' || '''+13.7''' || '''−2.2''' || '''+15.3''' || '''−7.2'''
| '''36, 57, 84, 101, 125, 133'''
| '''36, 57, 84, 101, 125, 133'''
|-
|-
! 13-limit WE
! 13-limit TE
| 33.302
| 1198.929
| −1.1 || −3.7 || +11.1 || −5.3 || +11.4 || −11.4
| −1.1 || −3.7 || +11.2 || −5.2 || +11.6 || −11.1
| 36, 57, 84, 101, 125, 133
| 36, 57, 84, 101, 125, 133
|-
|-
! 11-limit WE
! 11-limit TE
| 33.286
| 1198.330
| −1.7 || −4.7 || +9.7 || −6.9 || +9.4 || −13.5
| −1.7 || −4.6 || +9.8 || −6.8 || +9.5 || −13.4
| 36, 57, 84, 101, 125, 133
| 36, 57, 84, 101, 125, 133
|}
|}

Revision as of 17:42, 20 August 2025

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The guidelines

These are draft guidelines for what a standard "related tunings"-type section should look like on edo pages, using 36edo as an example.


Useful links for working on this
Which tunings should be listed for any given edo
  • The edo's pure-octaves tuning
  • 1 to 3 nearby edonoi (eg an edt, an edf, an ed5, an ed7, an ed4/3, anything like that)
  • 1 to 2 nearby ZPIs (or any other "infinite harmonics" optimised tuning other than ZPI)
  • 1 to 2 subgroup TE- or WE-optimal tunings, based on the best choice(s) of subgroup for the edo
  • 1 other equal tuning of any kind at all (optional)

Additional guidelines for selecting tunings:

  • In total, 3 to 8 tunings should be listed.
  • The selection of tunings should cover a range of meaningfully different tunings (eg with a range of different mappings).
Further instructions
  • Adding the comparison table at the end is optional.
  • The number of decimal places to use in the comparison table is up to the user's discretion, as long as it is self-consistent within the table.
Where this section should be placed on an edo page
  • Synopsis & infobox
  • (Any foundational introductory subsections)
  • Theory
    • Harmonics
    • (Any short subsections about theory unique to the edo)
    • Additional properties
    • Subsets and supersets
  • Interval table
  • Notation
  • (Any long subsections about theory unique to the edo)
  • Approximation to JI
  • Regular temperament properties
    • Uniform maps
    • Commas
    • Rank-2 temperaments
  • OCTAVE STRETCH OR COMPRESSION
  • Scales
  • (Any subsections about practice unique to the edo)
  • Instruments
  • Music
  • See also
  • Notes
  • Further reading
  • External links

Note: This particular set of headings in this order is only how most edo pages look at the moment, but it might be replaced with a more intuitive standard in the future. If and when that happens, this guideline should be modified to adopt that new standard.

Plan for roll-out

Edo pages which currently have an "octave stretch", "related tunings", "zeta properties", etc. section:

This standard will need to be rolled out to those above pages.

It can optionally be rolled out to other edo pages later.

Things to note
  • When rolling it out try not to delete existing body text but instead rework it where possible.
  • This section will not replace any "n-edo and octave stretch" pages. Still, add this section to the relevant edo page, but also link to the "n-edo and octave stretch" page at the top of this section, using the see also Template, eg: "{{See also|36edo and octave stretch}}".

Example (36edo)

Octave stretch or compression

What follows is a comparison of stretched- and compressed-octave 36edo tunings.

21edf
  • Step size: 33.426 ¢, octave size: 1203.3 ¢
Approximation of harmonics in 21edf
Harmonic 2 3 4 5 6 7 8 9 10 11 12
Error Absolute (¢) +3.4 +3.4 +6.7 -11.9 +6.7 +7.2 +10.1 +6.7 -8.6 -6.4 +10.1
Relative (%) +10.0 +10.0 +20.1 -35.7 +20.1 +21.7 +30.1 +20.1 -25.6 -19.3 +30.1
Steps
(reduced) 		36
(15) 		57
(15) 		72
(9) 		83
(20) 		93
(9) 		101
(17) 		108
(3) 		114
(9) 		119
(14) 		124
(19) 		129
(3)
Approximation of harmonics in 21edf (continued)
Harmonic 13 14 15 16 17 18 19 20 21 22 23 24
Error Absolute (¢) +5.2 +10.6 -8.6 +13.4 +8.7 +10.1 -16.7 -5.2 +10.6 -3.1 -13.2 +13.4
Relative (%) +15.5 +31.7 -25.6 +40.1 +26.1 +30.1 -49.9 -15.6 +31.7 -9.2 -39.5 +40.1
Steps
(reduced) 		133
(7) 		137
(11) 		140
(14) 		144
(18) 		147
(0) 		150
(3) 		152
(5) 		155
(8) 		158
(11) 		160
(13) 		162
(15) 		165
(18)

Stretching the octave of 36edo by a little over 3 ¢ results in improved primes 5, 11, and 13, but worse primes 2, 3, and 7. This approximates all primes up to 11 within 12.0 ¢. The tuning 21edf does this.

57edt
  • Step size: 33.368 ¢, octave size: 1201.2 ¢
Approximation of harmonics in 57edt
Harmonic 2 3 4 5 6 7 8 9 10 11 12
Error Absolute (¢) +1.2 +0.0 +2.5 +16.6 +1.2 +1.3 +3.7 +0.0 -15.6 -13.7 +2.5
Relative (%) +3.7 +0.0 +7.4 +49.7 +3.7 +3.9 +11.1 +0.0 -46.6 -41.2 +7.4
Steps
(reduced) 		36
(36) 		57
(0) 		72
(15) 		84
(27) 		93
(36) 		101
(44) 		108
(51) 		114
(0) 		119
(5) 		124
(10) 		129
(15)
Approximation of harmonics in 57edt (continued)
Harmonic 13 14 15 16 17 18 19 20 21 22 23 24
Error Absolute (¢) -2.6 +2.5 +16.6 +4.9 +0.1 +1.2 +7.7 -14.3 +1.3 -12.5 +10.6 +3.7
Relative (%) -7.9 +7.6 +49.7 +14.8 +0.3 +3.7 +23.2 -42.9 +3.9 -37.5 +31.9 +11.1
Steps
(reduced) 		133
(19) 		137
(23) 		141
(27) 		144
(30) 		147
(33) 		150
(36) 		153
(39) 		155
(41) 		158
(44) 		160
(46) 		163
(49) 		165
(51)

If one intends to use both 36edo's vals for 5/1 at once, stretching the octave of 36edo by about 1 ¢ optimises 36edo for that dual-5 usage, while also making slight improvements to primes 3, 7, 11, and 13. This approximates all primes up to 11 within 16.6 ¢. Five almost-identical tunings do this: 57edt, 101ed7, 155zpi, and the 2.3.7.13-subgroup TE and WE tunings of 36et.

36edo
  • Step size: 33.333 ¢, octave size: 1200.000 ¢
Approximation of harmonics in 36edo
Harmonic 2 3 4 5 6 7 8 9 10 11 12
Error Absolute (¢) +0.0 -2.0 +0.0 +13.7 -2.0 -2.2 +0.0 -3.9 +13.7 +15.3 -2.0
Relative (%) +0.0 -5.9 +0.0 +41.1 -5.9 -6.5 +0.0 -11.7 +41.1 +46.0 -5.9
Steps
(reduced) 		36
(0) 		57
(21) 		72
(0) 		84
(12) 		93
(21) 		101
(29) 		108
(0) 		114
(6) 		120
(12) 		125
(17) 		129
(21)
Approximation of harmonics in 36edo (continued)
Harmonic 13 14 15 16 17 18 19 20 21 22 23 24
Error Absolute (¢) -7.2 -2.2 +11.7 +0.0 -5.0 -3.9 +2.5 +13.7 -4.1 +15.3 +5.1 -2.0
Relative (%) -21.6 -6.5 +35.2 +0.0 -14.9 -11.7 +7.5 +41.1 -12.3 +46.0 +15.2 -5.9
Steps
(reduced) 		133
(25) 		137
(29) 		141
(33) 		144
(0) 		147
(3) 		150
(6) 		153
(9) 		156
(12) 		158
(14) 		161
(17) 		163
(19) 		165
(21)

Pure-octaves 36edo approximates all primes up to 11 within 15.3 ¢.

36et, 13-limit TE tuning
  • Step size: 33.304 ¢, octave size: 1198.929 ¢
Approximation of harmonics in 13-limit TE tuning of 36et
Harmonic 2 3 4 5 6 7 8 9 10 11 12
Error Absolute (¢) -1.1 -3.7 -2.1 +11.2 -4.7 -5.2 -3.2 -7.3 +10.1 +11.6 -5.8
Relative (%) -3.2 -11.0 -6.4 +33.6 -14.2 -15.5 -9.6 -21.9 +30.4 +34.9 -17.4
Step 36 57 72 84 93 101 108 114 120 125 129
Approximation of harmonics in 13-limit TE tuning of 36et (continued)
Harmonic 13 14 15 16 17 18 19 20 21 22 23 24
Error Absolute (¢) -11.1 -6.2 +7.5 -4.3 -9.3 -8.4 -2.1 +9.0 -8.8 +10.6 +0.2 -6.9
Relative (%) -33.5 -18.7 +22.6 -12.9 -28.0 -25.1 -6.2 +27.2 -26.5 +31.7 +0.6 -20.6
Step 133 137 141 144 147 150 153 156 158 161 163 165

Compressing the octave of 36edo by about 2 ¢ results in much improved primes 5 and 11, but much worse primes 7 and 13. This approximates all primes up to 11 within 9.7 ¢. The 11- and 13-limit TE tunings of 36et both do this, as do their respective WE tunings.

Comparison of stretched and compressed tunings
Tuning Octave size
(cents)		 Prime error (cents) Mapping of primes 2–13 (steps)
2 3 5 7 11 13
21edf 1203.351 +3.3 +3.3 −12.0 +7.2 −6.5 +5.1 36, 57, 83, 101, 124, 133
57edt 1201.235 +1.2 0.0 +16.6 +1.3 −13.7 −2.6 36, 57, 84, 101, 124, 133
155zpi 1200.587 +0.6 −1.0 +15.1 −0.5 −16.0 −5.0 36, 57, 83, 101, 124, 133
36edo 1200.000 0.0 −2.0 +13.7 −2.2 +15.3 −7.2 36, 57, 84, 101, 125, 133
13-limit TE 1198.929 −1.1 −3.7 +11.2 −5.2 +11.6 −11.1 36, 57, 84, 101, 125, 133
11-limit TE 1198.330 −1.7 −4.6 +9.8 −6.8 +9.5 −13.4 36, 57, 84, 101, 125, 133
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