Fractional-octave temperaments: Difference between revisions
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The most common way to produce a fractional-octave temperament is through an excellent approximation of an interval relative to the size of the wireframe edo. For example, [[compton family]] tempers out the Pythagorean comma and maps 7 steps of 12edo to [[3/2]]. Likewise, a lot of 10th-octave temperaments have a [[13/8]] as 7\10, and 26th-octave temperaments often have a [[7/4]] for 21\26. | The most common way to produce a fractional-octave temperament is through an excellent approximation of an interval relative to the size of the wireframe edo. For example, [[compton family]] tempers out the Pythagorean comma and maps 7 steps of 12edo to [[3/2]]. Likewise, a lot of 10th-octave temperaments have a [[13/8]] as 7\10, and 26th-octave temperaments often have a [[7/4]] for 21\26. | ||
However, an equal division does not have to be harmonically decent to be a wireframe for a fractional-octave temperament. If an equal division has multiples which are high in consistency or are zeta equal divisions or otherwise harmonically strong, it can produce a lot of such | However, an equal division does not have to be harmonically decent to be a wireframe for a fractional-octave temperament. If an equal division has multiples which are high in consistency or are zeta equal divisions or otherwise harmonically strong, it can produce a lot of such temperaments—notable examples being [[20edo]] or [[32edo]]. Likewise, proximity of a step of equal division to a comma is often a source of these temperaments—for example [[56edo]]'s step being directly close to [[81/80]], and 44edo's step being extremely close to [[64/63]]. | ||
=== Disagreement between temperament catalog strategy and fractional-octave practice === | === Disagreement between temperament catalog strategy and fractional-octave practice === | ||
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{| class="wikitable" | {| class="wikitable" | ||
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|[[2nd-octave temperaments|2]] | | [[2nd-octave temperaments|2]] | ||
|[[3rd-octave temperaments|3]] | | [[3rd-octave temperaments|3]] | ||
|[[4th-octave temperaments|4]] | | [[4th-octave temperaments|4]] | ||
|[[5th-octave temperaments|5]] | | [[5th-octave temperaments|5]] | ||
|[[6th-octave temperaments|6]] | | [[6th-octave temperaments|6]] | ||
|[[7th-octave temperaments|7]] | | [[7th-octave temperaments|7]] | ||
|[[8th-octave temperaments|8]] | | [[8th-octave temperaments|8]] | ||
|[[9th-octave temperaments|9]] | | [[9th-octave temperaments|9]] | ||
|[[10th-octave temperaments|10]] | | [[10th-octave temperaments|10]] | ||
|- | |- | ||
|[[11th-octave temperaments|11]] | | [[11th-octave temperaments|11]] | ||
|[[12th-octave temperaments|12]] | | [[12th-octave temperaments|12]] | ||
|[[13th-octave temperaments|13]] | | [[13th-octave temperaments|13]] | ||
|[[14th-octave temperaments|14]] | | [[14th-octave temperaments|14]] | ||
|[[15th-octave temperaments|15]] | | [[15th-octave temperaments|15]] | ||
|[[16th-octave temperaments|16]] | | [[16th-octave temperaments|16]] | ||
|[[17th-octave temperaments|17]] | | [[17th-octave temperaments|17]] | ||
|[[18th-octave temperaments|18]] | | [[18th-octave temperaments|18]] | ||
|[[19th-octave temperaments|19]] | | [[19th-octave temperaments|19]] | ||
|[[20th-octave temperaments|20]] | | [[20th-octave temperaments|20]] | ||
|- | |- | ||
|[[21st-octave temperaments|21]] | | [[21st-octave temperaments|21]] | ||
|[[22nd-octave temperaments|22]] | | [[22nd-octave temperaments|22]] | ||
|[[23rd-octave temperaments|23]] | | [[23rd-octave temperaments|23]] | ||
|[[24th-octave temperaments|24]] | | [[24th-octave temperaments|24]] | ||
|[[25th-octave temperaments|25]] | | [[25th-octave temperaments|25]] | ||
|[[26th-octave temperaments|26]] | | [[26th-octave temperaments|26]] | ||
|[[27th-octave temperaments|27]] | | [[27th-octave temperaments|27]] | ||
|[[28th-octave temperaments|28]] | | [[28th-octave temperaments|28]] | ||
|[[29th-octave temperaments|29]] | | [[29th-octave temperaments|29]] | ||
|[[30th-octave temperaments|30]] | | [[30th-octave temperaments|30]] | ||
|- | |- | ||
|[[31st-octave temperaments|31]] | | [[31st-octave temperaments|31]] | ||
|[[32nd-octave temperaments|32]] | | [[32nd-octave temperaments|32]] | ||
|[[33rd-octave temperaments|33]] | | [[33rd-octave temperaments|33]] | ||
|[[34th-octave temperaments|34]] | | [[34th-octave temperaments|34]] | ||
|[[35th-octave temperaments|35]] | | [[35th-octave temperaments|35]] | ||
|[[36th-octave temperaments|36]] | | [[36th-octave temperaments|36]] | ||
|[[37th-octave temperaments|37]] | | [[37th-octave temperaments|37]] | ||
|[[38th-octave temperaments|38]] | | [[38th-octave temperaments|38]] | ||
|[[39th-octave temperaments|39]] | | [[39th-octave temperaments|39]] | ||
|[[40th-octave temperaments|40]] | | [[40th-octave temperaments|40]] | ||
|- | |- | ||
|[[41st-octave temperaments|41]] / [[Countercomp family|C]] | | [[41st-octave temperaments|41]] / [[Countercomp family|C]] | ||
|[[42nd-octave temperaments|42]] | | [[42nd-octave temperaments|42]] | ||
|[[43rd-octave temperaments|43]] | | [[43rd-octave temperaments|43]] | ||
|[[44th-octave temperaments|44]] | | [[44th-octave temperaments|44]] | ||
|[[45th-octave temperaments|45]] | | [[45th-octave temperaments|45]] | ||
|[[46th-octave temperaments|46]] | | [[46th-octave temperaments|46]] | ||
|[[47th-octave temperaments|47]] | | [[47th-octave temperaments|47]] | ||
|[[48th-octave temperaments|48]] | | [[48th-octave temperaments|48]] | ||
|[[49th-octave temperaments|49]] | | [[49th-octave temperaments|49]] | ||
|[[50th-octave temperaments|50]] | | [[50th-octave temperaments|50]] | ||
|- | |- | ||
|[[51st-octave temperaments|51]] | | [[51st-octave temperaments|51]] | ||
|[[52nd-octave temperaments|52]] | | [[52nd-octave temperaments|52]] | ||
|[[53rd-octave temperaments|53]] / [[Mercator family|M]] | | [[53rd-octave temperaments|53]] / [[Mercator family|M]] | ||
|[[54th-octave temperaments|54]] | | [[54th-octave temperaments|54]] | ||
|[[55th-octave temperaments|55]] | | [[55th-octave temperaments|55]] | ||
|[[56th-octave temperaments|56]] | | [[56th-octave temperaments|56]] | ||
|[[57th-octave temperaments|57]] | | [[57th-octave temperaments|57]] | ||
|[[58th-octave temperaments|58]] | | [[58th-octave temperaments|58]] | ||
|[[59th-octave temperaments|59]] | | [[59th-octave temperaments|59]] | ||
|[[60th-octave temperaments|60]] | | [[60th-octave temperaments|60]] | ||
|- | |- | ||
|[[61st-octave temperaments|61]] | | [[61st-octave temperaments|61]] | ||
|[[62nd-octave temperaments|62]] | | [[62nd-octave temperaments|62]] | ||
|[[63rd-octave temperaments|63]] | | [[63rd-octave temperaments|63]] | ||
|[[64th-octave temperaments|64]] | | [[64th-octave temperaments|64]] | ||
|[[65th-octave temperaments|65]] | | [[65th-octave temperaments|65]] | ||
|[[66th-octave temperaments|66]] | | [[66th-octave temperaments|66]] | ||
|[[67th-octave temperaments|67]] | | [[67th-octave temperaments|67]] | ||
|[[68th-octave temperaments|68]] | | [[68th-octave temperaments|68]] | ||
|[[69th-octave temperaments|69]] | | [[69th-octave temperaments|69]] | ||
|[[70th-octave temperaments|70]] | | [[70th-octave temperaments|70]] | ||
|- | |- | ||
|[[71st-octave temperaments|71]] | | [[71st-octave temperaments|71]] | ||
|[[72nd-octave temperaments|72]] | | [[72nd-octave temperaments|72]] | ||
|[[73rd-octave temperaments|73]] | | [[73rd-octave temperaments|73]] | ||
|[[74th-octave temperaments|74]] | | [[74th-octave temperaments|74]] | ||
|[[75th-octave temperaments|75]] | | [[75th-octave temperaments|75]] | ||
|[[76th-octave temperaments|76]] | | [[76th-octave temperaments|76]] | ||
|[[77th-octave temperaments|77]] | | [[77th-octave temperaments|77]] | ||
|[[78th-octave temperaments|78]] | | [[78th-octave temperaments|78]] | ||
|[[79th-octave temperaments|79]] | | [[79th-octave temperaments|79]] | ||
|[[80th-octave temperaments|80]] | | [[80th-octave temperaments|80]] | ||
|- | |- | ||
|[[81st-octave temperaments|81]] | | [[81st-octave temperaments|81]] | ||
|[[82nd-octave temperaments|82]] | | [[82nd-octave temperaments|82]] | ||
|[[83rd-octave temperaments|83]] | | [[83rd-octave temperaments|83]] | ||
|[[84th-octave temperaments|84]] | | [[84th-octave temperaments|84]] | ||
|[[85th-octave temperaments|85]] | | [[85th-octave temperaments|85]] | ||
|[[86th-octave temperaments|86]] | | [[86th-octave temperaments|86]] | ||
|[[87th-octave temperaments|87]] | | [[87th-octave temperaments|87]] | ||
|[[88th-octave temperaments|88]] | | [[88th-octave temperaments|88]] | ||
|[[89th-octave temperaments|89]] | | [[89th-octave temperaments|89]] | ||
|[[90th-octave temperaments|90]] | | [[90th-octave temperaments|90]] | ||
|- | |- | ||
|[[91st-octave temperaments|91]] | | [[91st-octave temperaments|91]] | ||
|[[92nd-octave temperaments|92]] | | [[92nd-octave temperaments|92]] | ||
|[[93rd-octave temperaments|93]] | | [[93rd-octave temperaments|93]] | ||
|[[94th-octave temperaments|94]] | | [[94th-octave temperaments|94]] | ||
|[[95th-octave temperaments|95]] | | [[95th-octave temperaments|95]] | ||
|[[96th-octave temperaments|96]] | | [[96th-octave temperaments|96]] | ||
|[[97th-octave temperaments|97]] | | [[97th-octave temperaments|97]] | ||
|[[98th-octave temperaments|98]] | | [[98th-octave temperaments|98]] | ||
|[[99th-octave temperaments|99]] | | [[99th-octave temperaments|99]] | ||
|[[100th-octave temperaments|100]] | | [[100th-octave temperaments|100]] | ||
|} | |} | ||