441edo: Difference between revisions
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'''441edo''' is the [[equal division of the octave]] into 441 parts of 2.721 [[cent]]s each. It is a very strong [[7-limit]] system; strong enough to qualify as a [[The Riemann Zeta Function and Tuning #Zeta EDO lists|zeta peak edo]]. It is also very strong simply considered as a 5-limit system; it is the first division past [[118edo|118]] with a lower [[5-limit]] [[Tenney-Euclidean temperament measures #TE simple badness|relative error]]. In the 5-limit It [[tempering out|tempers out]] the [[hemithirds comma]], {{monzo| 38 -2 -15 }}, the [[ennealimma]], {{monzo| 1 -27 18 }}, whoosh, {{monzo| 37 25 -33 }}, and egads, {{monzo| -36 -52 51 }}. In the 7-limit it tempers out [[2401/2400]], [[4375/4374]], [[420175/419904]] and [[250047/250000]], so that it supports [[Ragismic microtemperaments #Ennealimmal|ennealimmal temperament]]. In the [[11-limit]] it tempers out [[4000/3993]], and in the 13-limit, [[1575/1573]], [[2080/2079]] and [[4096/4095]]. It provides the [[optimal patent val]] for 11- and [[13-limit]] [[Ragismic microtemperaments #Ennealimmal|semiennealimmal temperament]], and the 7-limit 41&359 temperament. Since it tempers out 1575/1573, the nicola, it allows the [[nicolic tetrad]]. | '''441edo''' is the [[equal division of the octave]] into 441 parts of 2.721 [[cent]]s each. | ||
== Theory == | |||
{{Primes in edo|441|prec=3|columns=10}} | |||
It is a very strong [[7-limit]] system; strong enough to qualify as a [[The Riemann Zeta Function and Tuning #Zeta EDO lists|zeta peak edo]]. It is also very strong simply considered as a 5-limit system; it is the first division past [[118edo|118]] with a lower [[5-limit]] [[Tenney-Euclidean temperament measures #TE simple badness|relative error]]. In the 5-limit It [[tempering out|tempers out]] the [[hemithirds comma]], {{monzo| 38 -2 -15 }}, the [[ennealimma]], {{monzo| 1 -27 18 }}, whoosh, {{monzo| 37 25 -33 }}, and egads, {{monzo| -36 -52 51 }}. In the 7-limit it tempers out [[2401/2400]], [[4375/4374]], [[420175/419904]] and [[250047/250000]], so that it supports [[Ragismic microtemperaments #Ennealimmal|ennealimmal temperament]]. In the [[11-limit]] it tempers out [[4000/3993]], and in the 13-limit, [[1575/1573]], [[2080/2079]] and [[4096/4095]]. It provides the [[optimal patent val]] for 11- and [[13-limit]] [[Ragismic microtemperaments #Ennealimmal|semiennealimmal temperament]], and the 7-limit 41&359 temperament. Since it tempers out 1575/1573, the nicola, it allows the [[nicolic tetrad]]. | |||
The steps of 441 are only 1/30 of a cent sharp of 1/8 syntonic comma. Lowering the fifth, which is only 1/12 of a cent sharp, by two steps gives a generator, 256\441, close to 1/4 comma meantone. Like [[205edo]] but even more accurately, 441 can be used as a basis for a Vicentino style "adaptive JI" system. | The steps of 441 are only 1/30 of a cent sharp of 1/8 syntonic comma. Lowering the fifth, which is only 1/12 of a cent sharp, by two steps gives a generator, 256\441, close to 1/4 comma meantone. Like [[205edo]] but even more accurately, 441 can be used as a basis for a Vicentino style "adaptive JI" system. | ||
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441 factors into primes as 3<sup>2</sup>×7<sup>2</sup>, and has divisors {{EDOs|3, 7, 9, 21, 49, 63 and 147}}. | 441 factors into primes as 3<sup>2</sup>×7<sup>2</sup>, and has divisors {{EDOs|3, 7, 9, 21, 49, 63 and 147}}. | ||
{ | == Table of intervals == | ||
{| class="wikitable" | |||
|+Selected intervals | |||
!Step | |||
!Name | |||
!Asosociated ratio | |||
!Comments | |||
|- | |||
|0 | |||
|Prime | |||
|1/1 | |||
|Exact | |||
|- | |||
|8 | |||
|Syntonic comma | |||
|81/80 | |||
| | |||
|- | |||
|9 | |||
|Pythagorean comma | |||
|531441/524288 | |||
| | |||
|- | |||
|85 | |||
|Septimal supermajor second | |||
|8/7 | |||
| | |||
|- | |||
|98 | |||
|Septimal subminor third | |||
|7/6 | |||
| | |||
|- | |||
|142 | |||
|Classical major 3rd | |||
|5/4 | |||
| | |||
|- | |||
|150 | |||
|Pythagorean major 3rd | |||
|81/64 | |||
| | |||
|- | |||
|258 | |||
|Perfect 5th | |||
|3/2 | |||
| | |||
|- | |||
|356 | |||
|Harmonic 7th | |||
|7/4 | |||
| | |||
|- | |||
|441 | |||
|Octave | |||
|2/1 | |||
|Exact | |||
|} | |||
[[Category:441edo]] | [[Category:441edo]] | ||
[[Category:Equal divisions of the octave]] | [[Category:Equal divisions of the octave]] |