5th-octave temperaments: Difference between revisions
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{{ | {{Infobox fractional-octave|5}}[[5edo]] is the smallest xenharmonic system, as 1edo, 2edo, 3edo and 4edo are all subsets of [[12edo]]. | ||
[[5edo]] is the smallest xenharmonic system, as 1edo, 2edo, 3edo and 4edo are all subsets of [[12edo]]. | |||
The most notable 5th-octave family is [[limmic temperaments]] – [[tempering out]] [[256/243]] and associates 3\5 to [[3/2]] as well as 1\5 to [[9/8]], producing temperaments like [[blackwood]]. Equally notable among small equal divisions are the [[Cloudy clan|cloudy temperaments]] – identifying [[8/7]] with one step of 5edo. | |||
Other families of 5-limit 5th-octave commas are: | Other families of 5-limit 5th-octave commas are: | ||
* [[Pental family|Pental temperaments]] - tempers out the {{monzo|-28 25 -5}} comma which improves the 3/2 mapping for 5edo, producing a temperament with 3/2 as a generator and 1\5 as a period. | * [[Pental family|Pental temperaments]] - tempers out the {{monzo|-28 25 -5}} comma which improves the 3/2 mapping for 5edo, producing a temperament with 3/2 as a generator and 1\5 as a period. | ||
* [[ | * [[Quintosec family|Quintosec temperaments]] | ||
* [[Trisedodge family|Trisedodge temperaments]] | * [[Trisedodge family|Trisedodge temperaments]] | ||
== Slendroschismic == | |||
{{See also| No-fives subgroup temperaments #Slendroschismic }} | |||
Slendroschismic tempers out the [[slendroschisma]]. In this temperament, the period (1\5) is given a very accurate interpretation of [[147/128]] = ([[3/2]])/([[8/7]])<sup>2</sup> = ([[8/7]])⋅([[1029/1024|S7/S8]]), which is a significant interval as it is the "harmonic 5edostep" in that it is a [[rooted]] (/2<sup>''n''</sup>) interval that approximates 1\5 very well. The generator is [[1029/1024]], the difference between [[8/7]] and [[147/128]] and therefore between 3/2 and (8/7)<sup>3</sup>. The temperament is named for the very "slender" generator as well as as a reference on [[slendric]]. One can consider this as a microtemperament counterpart to [[cloudy]], which equates them. | |||
A possible extension to the full 7-limit is given by the [[hemipental]] temperament. | |||
[[Subgroup]]: 2.3.7 | |||
[[Comma list]]: 68719476736/68641485507 | |||
{{Mapping|legend=1| 5 0 18 | 0 2 -1 }} | |||
: Mapping generators: ~147/128, ~262144/151263 | |||
[[Optimal tuning]]s: | |||
* [[CTE]]: ~147/128 = 240.0000, ~8/7 = 230.9930 (~1029/1024 = 9.0080) | |||
* [[POTE]]: ~147/128 = 240.0000, ~8/7 = 231.0094 (~1029/1024 = 8.9906) | |||
{{Optimal ET sequence|legend=1| 130, 135, 265, 400, 935, 1335, 1735, 3070, 4805d }} | |||
[[Badness]] (Sintel): 0.456 | |||
[[Tp tuning #T2 tuning|RMS error]]: 0.0212 cents | |||
== Thunderclysmic == | |||
Thunderclysmic is a weak extension of slendroschismic (above), [[rainy]] and [[cata]], with a generator of a slightly sharp ~6/5 (befitting of any [[kleismic]] temperament), three of which making [[26/15]]~[[19/11]]. More interesting though is that the period is [[5edo|1\5]]; slendroschismic gives this a very accurate interpretation of [[147/128]] = ([[3/2]])/([[8/7]])<sup>2</sup> = [[8/7]] * [[1029/1024|S7/S8]] which is a significant interval as it is the "harmonic 5edostep" (in that it's a [[rooted]] (/2^n) interval in the 2.3.7 subgroup that approximates 1\5 very well). Thunderclysmic gives a wealth of interpretations to [[5edo]] intervals, which are available everywhere due to 1\5 = 240{{cent}} being the period of Thunderclysmic. In fact, Thunderclysmic combines many convergents and semiconvergents to intervals of [[5edo]] into a single, high-limit temperament: | |||
1\5 = [[23/20]] = [[31/27]] = [[85/74]] = [[54/47]] (which Thunderclysmic also equates with [[63/50]]), and 2\5 = [[33/25]] = [[95/72]] = [[29/22]] = [[62/47]] = [[128/97]] (which Thunderclysmic also equates with [[37/28]] and [[120/91]]). | |||
Thunderclysmic can be thought of as the [[125edo|125f]] & [[140edo|140]] temperament in the [[37-limit]] add-47 add-97, with both tunings notable in all corresponding limits. | |||
It is a complex temperament, however note that it is especially strong and elegant in the no-13's no-17's no-31's [[37-limit]] add-97, on which its mapping is especially efficient, so that the gen range is -3 to 7 for a(n inclusive) span of 11 notes per 1\5 period, so that a 5*11=55 note-per-octave (multiperiod) [[MOS]] may be used. | |||
=== 7-limit === | |||
7-limit Thunderclysmic also tempers out the [[4096000/4084101]] (the [[hemfiness comma]]). | |||
[[Subgroup]]: [[7-limit|2.3.5.7]] | |||
[[Comma list]]: [[15625/15552]], [[2100875/2097152]] | |||
{{Mapping|legend=1| 5 0 5 18 | 0 6 5 -3 }} | |||
[[Optimal tuning]] ([[CTE]]): 317.059{{cent}} | |||
{{Optimal ET sequence|legend=1| 15, 95bc, 110, 125, 140, 265, 405 }} | |||
[[Badness]] (Sintel): 3.009 | |||
=== 11-limit === | |||
Thunderclysmic extends naturally to the 11-limit by tempering [[385/384]] = ([[147/128]])/([[63/55]]) (or equivalently [[6250/6237]]). Note that Thunderclysmic observes the comma [[441/440]] = ([[21/20]])/([[22/21]]) = S21, as if it didn't, we would have 63/55 also equated with [[8/7]], leading to the [[15edo]] tuning which tempers the [[cloudy comma]]. In the 11-limit, the 5 EDO fourth is interpreted as [[33/25]]. | |||
[[Subgroup]]: [[11-limit|2.3.5.7.11]] | |||
[[Comma list]]: [[15625/15552]], [[2100875/2097152]], [[385/384]] | |||
{{Mapping|legend=1| 5 0 5 18 12 | 0 6 5 -3 4 }} | |||
[[Optimal tuning]] ([[CTE]]): 317.136{{cent}} | |||
{{Optimal ET sequence|legend=1| 15, 95bce, 110e, 125, 140, 265e, 405ee }} | |||
[[Badness]] (Sintel): 1.856 | |||
=== 13-limit === | |||
As Thunderclysmic is a weak extension of [[cata]], it is naturally at least 13-limit. Cata admits a fairly simple mapping of prime 13 via ([[6/5]])<sup>2</sup> = [[13/9]] so that a gen above that is [[26/15]] as half of [[3/1]]. As cata tempers [[625/624|625/624 = S25]] and [[676/675|676/675 = S26 = S13/S15]] and as the [[kleisma]] is S25<sup>2</sup> * S26, this replaces the kleisma in the comma list so that we now move it to the end (as both are 13-limit). For simplicity, we show [[325/324|325/324 = S25 * S26]] and the more structurally important aforementioned comma 676/675, omitting 625/624. It also tempers [[1001/1000]] and [[1716/1715]] in the 13-limit. | |||
[[Subgroup]]: [[13-limit|2.3.5.7.11.13]] | |||
[[Comma list]]: [[2100875/2097152]], [[385/384]], [[325/324]], [[676/675]] | |||
{{Mapping|legend=1| 5 0 5 18 12 0 | 0 6 5 -3 4 14 }} | |||
[[Optimal tuning]] ([[CTE]]): 317.136{{cent}} | |||
{{Optimal ET sequence|legend=1| 15, 125f, 140, 405eef }} | |||
[[Badness]] (Sintel): 1.458 | |||
=== 17-limit === | |||
In the 17-limit, the 5 EDO fifth is interpreted as [[85/56]] = [[561/560]] * [[50/33]], so that [[17/16]] is reached at 11 periods minus 8 gens at approx. 103{{cent}}; equating it with [[16/15]] might seem natural but is not the route taken due to the precision affording observing their difference, [[256/255]]. (If you do want to equate 17/16 with 16/15, you get the 15 & 155 temperament instead, for which the main tuning is [[155edo]], but you very much do pay for it; notice the errors!) Interestingly, the CTE tuning of the 17-limit of Thunderclysmic is practically the same as that of the 29-limit (up to a thousandth of a cent), which is also notable as being where this temperament exhibits the lowest Dirichlet badness. It's also the smallest prime limit where the vals larger than [[140edo]] haven't disappeared from the [[optimal ET sequence]], as from the 19-limit and onwards the optimal ET sequence is always [[15edo|15(ko)]], [[125edo|125f]], [[140edo|140]]. | |||
[[Subgroup]]: [[17-limit|2.3.5.7.11.13.17]] | |||
[[Comma list]]: [[2100875/2097152]], [[385/384]], [[325/324]], [[676/675]], [[561/560]] | |||
{{Mapping|legend=1| 5 0 5 18 12 0 31 | 0 6 5 -3 4 14 -8 }} | |||
[[Optimal tuning]] ([[CTE]]): 317.111{{cent}} | |||
{{Optimal ET sequence|legend=1| 15, 125f, 140, 265ef, 405eef }} | |||
[[Badness]] (Sintel): 1.493 | |||
=== 19-limit === | |||
As [[33/25]] and [[95/72]] are both close to the 5 EDO fourth, Thunderclysmic extends naturally to the 19-limit by tempering [[2376/2375]] = ([[33/25]])/([[95/72]]) = ([[6/5]])<sup>3</sup> / ([[19/11]]) and thus equivalently by tempering ([[26/15]])/([[19/11]]) = [[286/285]]. This is equivalent to tempering [[400/399|400/399 = S20]] = ([[20/19]])/([[21/20]]), which is natural to temper given that we observe [[441/440|441/440 = S21]] as aforementioned. | |||
[[Subgroup]]: [[19-limit|2.3.5.7.11.13.17.19]] | |||
[[Comma list]]: [[2100875/2097152]], [[385/384]], [[325/324]], [[676/675]], [[561/560]], [[286/285]] | |||
{{Mapping|legend=1| 5 0 5 18 12 0 31 12 | 0 6 5 -3 4 14 -8 7 }} | |||
[[Optimal tuning]] ([[CTE]]): 317.091{{cent}} | |||
{{Optimal ET sequence|legend=1| 15, 125f, 140 }} | |||
[[Badness]] (Sintel): 1.507 | |||
=== 23-limit === | |||
By tempering [[736/735]] = ([[46/45]])/([[49/48]]) we can equate [[23/20]] with [[147/128]] = 1\5 to extend to the 23-limit. This is equivalent to tempering [[253/252]] = ([[23/21]])/([[12/11]]). | |||
[[Subgroup]]: [[23-limit|2.3.5.7.11.13.17.19.23]] | |||
[[Comma list]]: [[2100875/2097152]], [[385/384]], [[325/324]], [[676/675]], [[561/560]], [[286/285]], [[736/735]] | |||
{{Mapping|legend=1| 5 0 5 18 12 0 31 12 16 | 0 6 5 -3 4 14 -8 7 5 }} | |||
[[Optimal tuning]] ([[CTE]]): 317.107{{cent}} | |||
{{Optimal ET sequence|legend=1| 15, 125f, 140 }} | |||
[[Badness]] (Sintel): 1.424 | |||
=== 29-limit === | |||
By tempering ([[33/25]])/([[29/22]]) = [[726/725]] we give another (slightly simpler) interpretation to the 5 EDO fourth to extend to the 29-limit. This is equivalent to tempering [[2640/2639]] = ([[120/91]])/([[29/22]]), which reveals that another 13-limit interpretation of the 5 EDO fourth is [[120/91]]. | |||
[[Subgroup]]: [[29-limit|2.3.5.7.11.13.17.19.23.29]] | |||
[[Comma list]]: [[2100875/2097152]], [[385/384]], [[325/324]], [[676/675]], [[561/560]], [[286/285]], [[736/735]], [[726/725]] | |||
{{Mapping|legend=1| 5 0 5 18 12 0 31 12 16 19 | 0 6 5 -3 4 14 -8 7 5 4 }} | |||
[[Optimal tuning]] ([[CTE]]): 317.111{{cent}} | |||
{{Optimal ET sequence|legend=1| 15, 125f, 140 }} | |||
[[Badness]] (Sintel): 1.318 | |||
=== 31-limit === | |||
By tempering [[3969/3968|3969/3968 = S63]] = ([[147/128]])/([[31/27]]), we give another interpretation to 1\5. This is the most complex mapping in this temperament, as reaching 27 requires 18 gens because reaching 3 requires 6 gens (as per [[kleismic]]). | |||
[[Subgroup]]: [[31-limit|2.3.5.7.11.13.17.19.23.29.31]] | |||
[[Comma list]]: [[2100875/2097152]], [[385/384]], [[325/324]], [[676/675]], [[561/560]], [[286/285]], [[736/735]], [[726/725]], [[3969/3968]] | |||
{{Mapping|legend=1| 5 0 5 18 12 0 31 12 16 19 1 | 0 6 5 -3 4 14 -8 7 5 4 18 }} | |||
[[Optimal tuning]] ([[CTE]]): 317.073{{cent}} | |||
{{Optimal ET sequence|legend=1| 15k, 125f, 140 }} | |||
[[Badness]] (Sintel): 1.501 | |||
=== 37-limit === | |||
By tempering [[407/406]] = ([[37/28]])/([[29/22]]), we give another interpretation to the 5 EDO fourth. This is equivalent to equating [[15/13]] with [[37/32]] by tempering [[481/480]]. | |||
[[Subgroup]]: [[37-limit|2.3.5.7.11.13.17.19.23.29.31.37]] | |||
[[Comma list]]: [[2100875/2097152]], [[385/384]], [[325/324]], [[676/675]], [[561/560]], [[286/285]], [[736/735]], [[726/725]], [[3969/3968]], [[481/480]] | |||
{{Mapping|legend=1| 5 0 5 18 12 0 31 12 16 19 1 30 | 0 6 5 -3 4 14 -8 7 5 4 18 -3 }} | |||
[[Optimal tuning]] ([[CTE]]): 317.068{{cent}} | |||
{{Optimal ET sequence|legend=1| 15k, 125f, 140 }} | |||
[[Badness]] (Sintel): 1.537 | |||
=== 37-limit add-47 add-97 === | |||
To the 37-limit, we add equivalences 1\5 = [[54/47]] (tempering S48 = ([[48/47]])/([[49/48]]) = [[2304/2303]]) and 3\5 = [[97/64]] (tempering [[8589934592/8587340257|(128/97)<sup>5</sup> / 4 = 8589934592/8587340257]]), but this can be expressed using a less long ratio by describing it as tempering [[S96 = 9216/9215]] = ([[97/64]])/([[144/95]]), from which we can observe [[144/95]] as another accurate interpretation of the 5 EDO fifth. | |||
[[Subgroup]]: 2.3.5.7.11.13.17.19.23.29.31.37.47.97 | |||
[[Comma list]]: [[2100875/2097152]], [[385/384]], [[325/324]], [[676/675]], [[561/560]], [[286/285]], [[736/735]], [[726/725]], [[3969/3968]], [[481/480]], [[2304/2303]], [[9216/9215]] | |||
{{Mapping|legend=1| 5 0 5 18 12 0 31 12 16 19 1 30 4 33 | 0 6 5 -3 4 14 -8 7 5 4 18 -3 18 0 }} | |||
[[Optimal tuning]] ([[CTE]]): 317.053{{cent}} | |||
{{Optimal ET sequence|legend=1| 15ko, 125f, 140 }} | |||
[[Badness]] (Sintel): 1.715 | |||
== Pentonismic (rank-5) == | == Pentonismic (rank-5) == | ||
{{Main|Pentonisma}} | {{Main| Pentonisma }} | ||
Subgroup: 2.3.5.7.11.13 | |||
[[Subgroup]]: 2.3.5.7.11.13 | |||
[[Comma list]]: 281974669312/281950621875 | |||
[[Mapping]]: [{{val|5 0 0 0 0 24}}, {{val|0 1 0 0 0 -1}}, {{val|0 0 1 0 0 -1}}, {{val|0 0 0 1 0 1}}, {{val|0 0 0 0 1 0}}] | |||
: Mapping generators: ~224/195 = 1\5, ~3, ~5, ~7, ~11 | |||
Supporting ETs: {{Optimal ET sequence|10, 50, 80, 120, 125, 270, 2000, 2460, 3125, 3395, 5585}} | |||
== Quint == | |||
Quint preserves the 5-limit mapping of 5edo, and harmonic 7 is mapped to an independent generator. As harmonic 7 is way more accurately approximated than 5 by 5edo, this temperament provides little improvement to 5edo's 7-limit tuning, so in what way this temperament is useful remains unexplained. It would make much more sense to, for example, preserve the 2.3.7-subgroup structure of 5edo and give prime 5 an independent generator instead, which is exactly what [[blacksmith]] does. | |||
[[Subgroup]]: 2.3.5.7 | |||
[[Comma list]]: 16/15, 27/25 | |||
{{Mapping|legend=1| 5 8 12 0 | 0 0 0 1 }} | |||
: Mapping generators: ~9/8, ~7 | |||
[[Optimal tuning]]s: | |||
* [[POTE]]: ~9/8 = 1\5, ~7/4 = 1017.903 (~21/20 = 57.903) | |||
* [[CTE]]: ~9/8 = 1\5, ~7/4 = 968.8259 (~63/64 = 8.8259) | |||
{{Optimal ET sequence|legend=1| 5, 15ccd }} | |||
[[Badness]]: 0.048312 | |||
== Obscenity == | |||
Obscenity maps [[32/21]] to 3\5 and was named in subtle reference to [[Syntonic–chromatic equivalence continuum #Absurdity|absurdity]] as a kind of septal (2.3.7) analog to it. | |||
[[Subgroup]]: 2.3.7 | |||
[[Comma list]]: 4194304/4084101 | |||
{{Mapping|legend=1| 5 0 22 | 0 1 -1 }} | |||
: Mapping generators: ~512/441, ~3 | |||
: | [[Support]]ing [[ET]]s: {{EDOs|5, 65d, 70, 75, 80, 85, 90, 95}} | ||
{{Navbox fractional-octave}} |