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 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]].
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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|[[2nd-octave temperaments|2]]
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|[[11th-octave temperaments|11]]
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|[[12th-octave temperaments|12]]
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|[[13th-octave temperaments|13]]
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|[[20th-octave temperaments|20]]
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|[[21st-octave temperaments|21]]
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|[[24th-octave temperaments|24]]
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|[[31st-octave temperaments|31]]
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|[[32nd-octave temperaments|32]]
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|[[40th-octave temperaments|40]]
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|[[41st-octave temperaments|41]] / [[Countercomp family|C]]
| [[41st-octave temperaments|41]] / [[Countercomp family|C]]
|[[42nd-octave temperaments|42]]
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|[[43rd-octave temperaments|43]]
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|[[44th-octave temperaments|44]]
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|[[53rd-octave temperaments|53]] / [[Mercator family|M]]
| [[53rd-octave temperaments|53]] / [[Mercator family|M]]
|[[54th-octave temperaments|54]]
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|[[55th-octave temperaments|55]]
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|[[56th-octave temperaments|56]]
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|[[64th-octave temperaments|64]]
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|[[65th-octave temperaments|65]]
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|[[81st-octave temperaments|81]]
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|[[91st-octave temperaments|91]]
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