Rodan: Difference between revisions
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See [[Gamelismic clan #Rodan]] for more information. | See [[Gamelismic clan #Rodan]] for more information. | ||
== | == Interval chain == | ||
When speaking of interval categories, as an extension of slendric it is possible to use a system [[Slendric#Interval categories|designed for slendric]], where notes are inflected from the diatonic [[chain of fifths]] by means of the prefixes "super" and "sub", such that three of these inflections stack to a diatonic minor second. These "super" and "sub" prefixes are equivalent to "up" and "down" in [[#Notation|the notation]] system, but can disambiguate from "up" and "down" symbols from [[ups and downs notation]] in the context of larger rodan edos that map this comma to multiple edosteps. | |||
In the following table, odd harmonics and subharmonics 1–21 are in '''bold'''. | In the following table, odd harmonics and subharmonics 1–21 are in '''bold'''. | ||
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* [[Rodan31opt]] | * [[Rodan31opt]] | ||
* [[Rodan41opt]] | * [[Rodan41opt]] | ||
== Notation == | |||
A notation for rodan is listed in the notation guide for rank-2 pergens under [[pergen]] #8, {{nowrap|(P8, P5/3)}}. The generator is an upmajor second. The [[enharmonic unisons in ups and downs notation|enharmonic unison]] is a triple-down minor second. Thus three ups equals a diatonic semitone, and three generators equals a perfect fifth. In rodan in particular, ^1 equals ~81/80 and ~64/63, and ^^1 equals ~33/32 and ~[[1053/1024]]. | |||
{| class="wikitable center-1 center-3" | |||
|+ style="font-size: 105%;" | Rodan nomenclature<br>for selected intervals | |||
|- | |||
! Ratio | |||
! Nominal | |||
! Example | |||
|- | |||
| 3/2 | |||
| Perfect fifth | |||
| C−G | |||
|- | |||
| 5/4 | |||
| Down major third | |||
| C−vE | |||
|- | |||
| 7/4 | |||
| Down minor seventh | |||
| C−vB♭ | |||
|- | |||
| 11/8 | |||
| Double-up fourth | |||
| C−^^F | |||
|- | |||
| 13/8 | |||
| Double-up minor sixth | |||
| C−^^A♭ | |||
|} | |||
Rodan's notation has much in common with that for 41edo and 46edo, since both edos map a minor second to three edosteps. It also resembles the notation for [[cassandra]]. All four notations notate the slendric tetrad (1–8/7–21/16–3/2) on C as C–^D–vF–G, and all four notations notate 5/4, 7/4, 11/8, and 13/8 as in the table above. But the notations diverge for other intervals, such as 11/10. | |||
== Tunings == | == Tunings == |