540edo: Difference between revisions

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The equal temperament [[tempering out|tempers out]] [[1156/1155]] and [[2601/2600]] in the 17-limit; [[1216/1215]], [[1331/1330]], [[1445/1444]] and [[1729/1728]] in the 19-limit; [[1105/1104]] and [[1496/1495]] in the 23-limit. Although it does quite well in these limits, it is not as ''efficient'' as 270edo's original mappings, as it has greater relative errors (→ [[#Regular temperament properties]]). It is therefore a question of whether one thinks these tuning improvements and differently supplied [[essentially tempered chord]]s are worth the load of all the extra notes.

The ~~approximation to~~ [[29/1|29]] and [[31/1|31]] are relatively weak, but [[37/1|37]], [[41/1|41]] and [[43/1|43]] are quite spot on, with the 43 coming from 270edo. For this reason, we may consider it as a full [[43-limit]] system. For all the primes starting with 29, it removes the distinction of otonal and utonal [[superparticular ratio|superparticular]] pairs (e.g. 29/28 vs 30/29 for prime 29) by tempering out the corresponding [[square superparticular]]s, which is responsible for its slightly flat-tending tuning profile. Prime [[47/1|47]] does not have that privilege and falls practically halfway between, though the sharp mapping might be preferred to keep [[47/46]] wider than [[48/47]]. As a compensation, you do get a spot-on prime [[53/1|53]] for free.

The approximated [[29/1|29]] and [[31/1|31]] are relatively weak, but [[37/1|37]], [[41/1|41]] and [[43/1|43]] are quite spot on, with the 43 coming from 270edo. For this reason, we may consider it as a full [[43-limit]] system. For all the primes starting with 29, it removes the distinction of otonal and utonal [[superparticular ratio|superparticular]] pairs (e.g. 29/28 vs 30/29 for prime 29) by tempering out the corresponding [[square superparticular]]s, which is responsible for its slightly flat-tending tuning profile. Prime [[47/1|47]] does not have that privilege and falls practically halfway between, though the sharp mapping might be preferred to keep [[47/46]] wider than [[48/47]]. As a compensation, you do get a spot-on prime [[53/1|53]] for free.

=== Prime harmonics ===

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540 is a very composite number. The [[prime factorization]] of 540 is {{factorization|540}}. Its nontrivial divisors are {{EDOs| 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 90, 108, 135, 180, and 270 }}.

A step of 540edo is known as a '''dexl''', proposed by [[Joseph Monzo]] in April 2023 as an [[interval size measure]]<ref>[http://tonalsoft.com/enc/d/dexl.aspx Tonalsoft Encyclopedia | Dexl / 540edo]</ref>.

== Approximation to JI ==

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 The equal temperament [[tempering out|tempers out]] [[1156/1155]] and [[2601/2600]] in the 17-limit; [[1216/1215]], [[1331/1330]], [[1445/1444]] and [[1729/1728]] in the 19-limit; [[1105/1104]] and [[1496/1495]] in the 23-limit. Although it does quite well in these limits, it is not as ''efficient'' as 270edo's original mappings, as it has greater relative errors (→ [[#Regular temperament properties]]). It is therefore a question of whether one thinks these tuning improvements and differently supplied [[essentially tempered chord]]s are worth the load of all the extra notes.
-The approximation to [[29/1|29]] and [[31/1|31]] are relatively weak, but [[37/1|37]], [[41/1|41]] and [[43/1|43]] are quite spot on, with the 43 coming from 270edo. For this reason, we may consider it as a full [[43-limit]] system. For all the primes starting with 29, it removes the distinction of otonal and utonal [[superparticular ratio|superparticular]] pairs (e.g. 29/28 vs 30/29 for prime 29) by tempering out the corresponding [[square superparticular]]s, which is responsible for its slightly flat-tending tuning profile. Prime [[47/1|47]] does not have that privilege and falls practically halfway between, though the sharp mapping might be preferred to keep [[47/46]] wider than [[48/47]]. As a compensation, you do get a spot-on prime [[53/1|53]] for free.
+The approximated [[29/1|29]] and [[31/1|31]] are relatively weak, but [[37/1|37]], [[41/1|41]] and [[43/1|43]] are quite spot on, with the 43 coming from 270edo. For this reason, we may consider it as a full [[43-limit]] system. For all the primes starting with 29, it removes the distinction of otonal and utonal [[superparticular ratio|superparticular]] pairs (e.g. 29/28 vs 30/29 for prime 29) by tempering out the corresponding [[square superparticular]]s, which is responsible for its slightly flat-tending tuning profile. Prime [[47/1|47]] does not have that privilege and falls practically halfway between, though the sharp mapping might be preferred to keep [[47/46]] wider than [[48/47]]. As a compensation, you do get a spot-on prime [[53/1|53]] for free.
 === Prime harmonics ===
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 is a very composite number. The [[prime factorization]] of 540 is {{factorization|540}}. Its nontrivial divisors are {{EDOs| 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 90, 108, 135, 180, and 270 }}.
 A step of 540edo is known as a '''dexl''', proposed by [[Joseph Monzo]] in April 2023 as an [[interval size measure]]<ref>[http://tonalsoft.com/enc/d/dexl.aspx Tonalsoft Encyclopedia | Dexl / 540edo]</ref>.
 == Approximation to JI ==