User:Eliora/Concoctic scale: Difference between revisions
→Concoctic scales in EDOs: clarified and added other temps that make more sense |
→Mathematical definition: added more precise explanation of ortho- and para- |
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12edo 5L2s diatonic scale, the predominantly used scale in the world's music today, is an example. | 12edo 5L2s diatonic scale, the predominantly used scale in the world's music today, is an example. | ||
== Mathematical | == Mathematical derivation == | ||
The length of a maximum evenness scale's generator can be determined through a '''modular multiplicative inverse''' of the note amount and the tuning size<ref>https://individual.utoronto.ca/kalendis/leap/index.htm</ref> | The length of a maximum evenness scale's generator can be determined through a '''modular multiplicative inverse''' of the note amount and the tuning size<ref>https://individual.utoronto.ca/kalendis/leap/index.htm</ref>. | ||
<math>ax \equiv 1\mod N</math>, | <math>ax \equiv 1\mod N</math>, | ||
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<math>a^2 \equiv 1\mod N \hspace{4cm} (1)</math>. | <math>a^2 \equiv 1\mod N \hspace{4cm} (1)</math>. | ||
There are also paraconcoctic scales, or chroma-negative concoctic scales. The formula for such a scale is | A scale is called '''orthoconcoctic''', if the generator corresponding to note amount is the chroma-positive generator, for example - the 12edo diatonic scale is. There are also '''paraconcoctic''' scales, or chroma-negative concoctic scales. The formula for such a scale is | ||
<math>a^2 \equiv -1\mod N \hspace{4cm} (2)</math>. | <math>a^2 \equiv -1\mod N \hspace{4cm} (2)</math>. | ||
Since octave-inverting the MOS generator has no impact on the scale, paraconcoctic scales are identical to their usual, orthoconcoctic counterparts. However, the difference is pronounced | Since octave-inverting the MOS generator has no impact on the scale, paraconcoctic scales are identical to their usual, orthoconcoctic counterparts. However, the difference is pronounced in terms of modal brightness. | ||
=== Example === | === Example === | ||
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|[[15625/15552]]* | |[[15625/15552]]* | ||
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|Forms the [[Hanson]] (11b & 15) | |*Forms the [[Hanson]] (11b & 15) | ||
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