121edo: Difference between revisions

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== Theory ==

121edo has a distinctly sharp tendency, in that the odd [[harmonic]]s from 3 to 19 all have sharp tunings. ~~The equal temperament~~ [[~~tempering out|~~tempers out]] 15625/15552 ([[15625/15552|kleisma]]) in the [[5-limit]]; [[4000/3969]], [[6144/6125]], [[10976/10935]] in the [[7-limit]]; [[540/539]], [[896/891]] and [[1375/1372]] in the 11-limit; [[325/324]], [[352/351]], [[364/363]] and [[625/624]] in the [[13-limit]]; [[256/255]], [[375/374]] and [[442/441]] in the [[17-limit]]; [[190/189]] and [[361/360]] in the [[19-limit]]. It also serves as the [[optimal patent val]] for 13-limit [[grendel]] temperament. It is [[consistent]] through to the [[19-odd-limit]] and uniquely consistent to the [[15-odd-limit]].

121edo has a distinctly sharp tendency, in that the odd [[harmonic]]s from 3 to 19 all have sharp tunings. It [[tempers out]] 15625/15552 ([[15625/15552|kleisma]]) in the [[5-limit]]; [[4000/3969]], [[6144/6125]], [[10976/10935]] in the [[7-limit]]; [[540/539]], [[896/891]] and [[1375/1372]] in the 11-limit; [[325/324]], [[352/351]], [[364/363]] and [[625/624]] in the [[13-limit]]; [[256/255]], [[375/374]] and [[442/441]] in the [[17-limit]]; [[190/189]] and [[361/360]] in the [[19-limit]]. It also serves as the [[optimal patent val]] for 13-limit [[grendel]] temperament. It is [[consistent]] through to the [[19-odd-limit]] and uniquely consistent to the [[15-odd-limit]].

Because it tempers out 540/539 it allows [[swetismic chords]], because it tempers out 325/324 it allows [[marveltwin chords]], because it tempers out 640/637 it allows [[huntmic chords]], because it tempers out 352/351 it allows [[major minthmic chords]], because it tempers out 364/363 it allows [[minor minthmic chords]], because it tempers out 676/675 it allows [[island chords]] and because it tempers out 1575/1573 it allows [[nicolic chords]]. That makes for a very flexible system, and since this suite of commas defines 13-limit 121et, it is a system only associated with 121.

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| {{monzo| 192 -121 }}

| {{mapping| 121 192 }}

| ~~−0~~.687

| −0.687

| 0.687

| 6.93

Line 35:

| 15625/15552, {{monzo| 31 -21 1 }}

| {{mapping| 121 192 281 }}

| ~~−0~~.524

| −0.524

| 0.606

| 6.11

Line 42:

| 4000/3969, 6144/6125, 10976/10935

| {{mapping| 121 192 281 340 }}

| ~~−0~~.667

| −0.667

| 0.580

| 5.85

Line 49:

| 540/539, 896/891, 1375/1372, 4375/4356

| {{mapping| 121 192 281 340 419 }}

| ~~−0~~.768

| −0.768

| 0.556

| 5.61

Line 56:

| 325/324, 352/351, 364/363, 540/539, 625/624

| {{mapping| 121 192 281 340 419 448 }}

| ~~−0~~.750

| −0.750

| 0.510

| 5.14

Line 63:

| 256/255, 325/324, 352/351, 364/363, 375/374, 442/441

| {{mapping| 121 192 281 340 419 448 495 }}

| ~~−0~~.787

| −0.787

| 0.480

| 4.85

Line 70:

| 190/189, 256/255, 325/324, 352/351, 361/360, 364/363, 375/374

| {{mapping| 121 192 281 340 419 448 495 514 }}

| ~~−0~~.689

| −0.689

| 0.519

| 5.23

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| [[Hendecatonic]]

|}

<nowiki />* [[Normal lists|Octave-reduced form]], reduced to the first half-octave, and [[Normal lists|minimal form]] in parentheses if ~~it is~~ distinct

<nowiki />* [[Normal lists|Octave-reduced form]], reduced to the first half-octave, and [[Normal lists|minimal form]] in parentheses if distinct

== 13-limit detempering of 121et ==

@@ Line 3: / Line 3: @@
 == Theory ==
-edo has a distinctly sharp tendency, in that the odd [[harmonic]]s from 3 to 19 all have sharp tunings. The equal temperament [[tempering out|tempers out]] 15625/15552 ([[15625/15552|kleisma]]) in the [[5-limit]]; [[4000/3969]], [[6144/6125]], [[10976/10935]] in the [[7-limit]]; [[540/539]], [[896/891]] and [[1375/1372]] in the 11-limit; [[325/324]], [[352/351]], [[364/363]] and [[625/624]] in the [[13-limit]]; [[256/255]], [[375/374]] and [[442/441]] in the [[17-limit]]; [[190/189]] and [[361/360]] in the [[19-limit]]. It also serves as the [[optimal patent val]] for 13-limit [[grendel]] temperament. It is [[consistent]] through to the [[19-odd-limit]] and uniquely consistent to the [[15-odd-limit]].
+edo has a distinctly sharp tendency, in that the odd [[harmonic]]s from 3 to 19 all have sharp tunings. It [[tempers out]] 15625/15552 ([[15625/15552|kleisma]]) in the [[5-limit]]; [[4000/3969]], [[6144/6125]], [[10976/10935]] in the [[7-limit]]; [[540/539]], [[896/891]] and [[1375/1372]] in the 11-limit; [[325/324]], [[352/351]], [[364/363]] and [[625/624]] in the [[13-limit]]; [[256/255]], [[375/374]] and [[442/441]] in the [[17-limit]]; [[190/189]] and [[361/360]] in the [[19-limit]]. It also serves as the [[optimal patent val]] for 13-limit [[grendel]] temperament. It is [[consistent]] through to the [[19-odd-limit]] and uniquely consistent to the [[15-odd-limit]].
 Because it tempers out 540/539 it allows [[swetismic chords]], because it tempers out 325/324 it allows [[marveltwin chords]], because it tempers out 640/637 it allows [[huntmic chords]], because it tempers out 352/351 it allows [[major minthmic chords]], because it tempers out 364/363 it allows [[minor minthmic chords]], because it tempers out 676/675 it allows [[island chords]] and because it tempers out 1575/1573 it allows [[nicolic chords]]. That makes for a very flexible system, and since this suite of commas defines 13-limit 121et, it is a system only associated with 121.
@@ Line 28: / Line 28: @@
 | {{monzo| 192 -121 }}
 | {{mapping| 121 192 }}
-| &minus;0.687
+| −0.687
 | 0.687
 | 6.93
@@ Line 35: / Line 35: @@
 | 15625/15552, {{monzo| 31 -21 1 }}
 | {{mapping| 121 192 281 }}
-| &minus;0.524
+| −0.524
 | 0.606
 | 6.11
@@ Line 42: / Line 42: @@
 | 4000/3969, 6144/6125, 10976/10935
 | {{mapping| 121 192 281 340 }}
-| &minus;0.667
+| −0.667
 | 0.580
 | 5.85
@@ Line 49: / Line 49: @@
 | 540/539, 896/891, 1375/1372, 4375/4356
 | {{mapping| 121 192 281 340 419 }}
-| &minus;0.768
+| −0.768
 | 0.556
 | 5.61
@@ Line 56: / Line 56: @@
 | 325/324, 352/351, 364/363, 540/539, 625/624
 | {{mapping| 121 192 281 340 419 448 }}
-| &minus;0.750
+| −0.750
 | 0.510
 | 5.14
@@ Line 63: / Line 63: @@
 | 256/255, 325/324, 352/351, 364/363, 375/374, 442/441
 | {{mapping| 121 192 281 340 419 448 495 }}
-| &minus;0.787
+| −0.787
 | 0.480
 | 4.85
@@ Line 70: / Line 70: @@
 | 190/189, 256/255, 325/324, 352/351, 361/360, 364/363, 375/374
 | {{mapping| 121 192 281 340 419 448 495 514 }}
-| &minus;0.689
+| −0.689
 | 0.519
 | 5.23
@@ Line 194: / Line 194: @@
 | [[Hendecatonic]]
 |}
-<nowiki />* [[Normal lists|Octave-reduced form]], reduced to the first half-octave, and [[Normal lists|minimal form]] in parentheses if it is distinct
+<nowiki />* [[Normal lists|Octave-reduced form]], reduced to the first half-octave, and [[Normal lists|minimal form]] in parentheses if distinct
 == 13-limit detempering of 121et ==