Meantone family: Difference between revisions
Wikispaces>genewardsmith **Imported revision 179239363 - Original comment: ** |
Wikispaces>genewardsmith **Imported revision 179245713 - Original comment: ** |
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<h2>IMPORTED REVISION FROM WIKISPACES</h2> | <h2>IMPORTED REVISION FROM WIKISPACES</h2> | ||
This is an imported revision from Wikispaces. The revision metadata is included below for reference:<br> | This is an imported revision from Wikispaces. The revision metadata is included below for reference:<br> | ||
: This revision was by author [[User:genewardsmith|genewardsmith]] and made on <tt>2010-11-13 | : This revision was by author [[User:genewardsmith|genewardsmith]] and made on <tt>2010-11-13 20:43:23 UTC</tt>.<br> | ||
: The original revision id was <tt> | : The original revision id was <tt>179245713</tt>.<br> | ||
: The revision comment was: <tt></tt><br> | : The revision comment was: <tt></tt><br> | ||
The revision contents are below, presented both in the original Wikispaces Wikitext format, and in HTML exactly as Wikispaces rendered it.<br> | The revision contents are below, presented both in the original Wikispaces Wikitext format, and in HTML exactly as Wikispaces rendered it.<br> | ||
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Map: [<1 0 -4 -13 -25|, <0 1 4 10 18|] | Map: [<1 0 -4 -13 -25|, <0 1 4 10 18|] | ||
Generators: 2, 3 | Generators: 2, 3 | ||
====Meanpop==== | |||
Commas: 81/80, 126/125, 385/384 | |||
11-limit minimax 1/4 comma | |||
[|1 0 0 0 0>, |1 0 1/4 0 0>, |0 0 1 0 0>, | |||
|-3 0 5/2 0 0>, |11 0 -13/4 0 0>] | |||
Eigenmonzos: 2, 5 | |||
Algebraic generator: Cybozem; or else Radieubiz, the real root of 3x^3+6x-19. Unlike Cybozem, the recurrence for Radieubiz does not converge. | |||
Map: [<1 0 -4 -13 24|, <0 1 4 10 -13|] | |||
Generators: 2, 3 | |||
===Flattone=== | ===Flattone=== | ||
Similarly for flattone, the wedgie is <<1 4 -9 4 -17 -32||, which tells us among other things that 9 generator steps of 4/3 get to the interval class for 7, meaning that 7/4 is a diminished minor seventh interval. Other intervals are 7/6, a diminished minor third, and 7/5, a doubly diminshed fifth. Good tunings for flattone are [[26edo]], [[45edo]] and [[64edo]]. | Similarly for flattone, the wedgie is <<1 4 -9 4 -17 -32||, which tells us among other things that 9 generator steps of 4/3 get to the interval class for 7, meaning that 7/4 is a diminished minor seventh interval. Other intervals are 7/6, a diminished minor third, and 7/5, a doubly diminshed fifth. Good tunings for flattone are [[26edo]], [[45edo]] and [[64edo]]. | ||
Commas: 81/80, 525/512 | |||
7-limit minimax | |||
[|1 0 0 0>, |21/13 0 1/13 -1/13>, | |||
|32/13 0 4/13 -4/13>, |32/13 0 -9/13 9/13>] | |||
Eigenmonzos: 2, 7/5 | |||
9-limit minimax | |||
[|1 0 0 0>, |17/11 2/11 0 -1/11>, | |||
|24/11 8/11 0 -4/11>, |34/11 -18/11 0 9/11>] | |||
Eigenmonzos: 2, 9/7 | |||
Algebraic generator: Squarto, the positive root of 8x^2-4x-9, at 506.3239 cents, equal to (1+sqrt(19))/4. | |||
Map: [<1 0 -4 17|, <0 1 4 -9|] | |||
Generators: 2, 3 | |||
===Dominant=== | ===Dominant=== | ||
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Map: [&lt;1 0 -4 -13 -25|, &lt;0 1 4 10 18|]<br /> | Map: [&lt;1 0 -4 -13 -25|, &lt;0 1 4 10 18|]<br /> | ||
Generators: 2, 3<br /> | Generators: 2, 3<br /> | ||
<!-- ws:start:WikiTextHeadingRule:6:&lt;h3&gt; --><h3 id=" | <br /> | ||
<!-- ws:start:WikiTextHeadingRule:6:&lt;h4&gt; --><h4 id="toc3"><a name="x-Seven limit children-Septimal meantone-Meanpop"></a><!-- ws:end:WikiTextHeadingRule:6 -->Meanpop</h4> | |||
Commas: 81/80, 126/125, 385/384<br /> | |||
<br /> | |||
11-limit minimax 1/4 comma<br /> | |||
[|1 0 0 0 0&gt;, |1 0 1/4 0 0&gt;, |0 0 1 0 0&gt;, <br /> | |||
|-3 0 5/2 0 0&gt;, |11 0 -13/4 0 0&gt;]<br /> | |||
Eigenmonzos: 2, 5<br /> | |||
<br /> | |||
Algebraic generator: Cybozem; or else Radieubiz, the real root of 3x^3+6x-19. Unlike Cybozem, the recurrence for Radieubiz does not converge.<br /> | |||
<br /> | |||
Map: [&lt;1 0 -4 -13 24|, &lt;0 1 4 10 -13|]<br /> | |||
Generators: 2, 3<br /> | |||
<br /> | |||
<!-- ws:start:WikiTextHeadingRule:8:&lt;h3&gt; --><h3 id="toc4"><a name="x-Seven limit children-Flattone"></a><!-- ws:end:WikiTextHeadingRule:8 -->Flattone</h3> | |||
Similarly for flattone, the wedgie is &lt;&lt;1 4 -9 4 -17 -32||, which tells us among other things that 9 generator steps of 4/3 get to the interval class for 7, meaning that 7/4 is a diminished minor seventh interval. Other intervals are 7/6, a diminished minor third, and 7/5, a doubly diminshed fifth. Good tunings for flattone are <a class="wiki_link" href="/26edo">26edo</a>, <a class="wiki_link" href="/45edo">45edo</a> and <a class="wiki_link" href="/64edo">64edo</a>.<br /> | Similarly for flattone, the wedgie is &lt;&lt;1 4 -9 4 -17 -32||, which tells us among other things that 9 generator steps of 4/3 get to the interval class for 7, meaning that 7/4 is a diminished minor seventh interval. Other intervals are 7/6, a diminished minor third, and 7/5, a doubly diminshed fifth. Good tunings for flattone are <a class="wiki_link" href="/26edo">26edo</a>, <a class="wiki_link" href="/45edo">45edo</a> and <a class="wiki_link" href="/64edo">64edo</a>.<br /> | ||
<br /> | <br /> | ||
<!-- ws:start:WikiTextHeadingRule: | Commas: 81/80, 525/512<br /> | ||
<br /> | |||
7-limit minimax<br /> | |||
[|1 0 0 0&gt;, |21/13 0 1/13 -1/13&gt;, <br /> | |||
|32/13 0 4/13 -4/13&gt;, |32/13 0 -9/13 9/13&gt;]<br /> | |||
Eigenmonzos: 2, 7/5<br /> | |||
<br /> | |||
9-limit minimax<br /> | |||
[|1 0 0 0&gt;, |17/11 2/11 0 -1/11&gt;, <br /> | |||
|24/11 8/11 0 -4/11&gt;, |34/11 -18/11 0 9/11&gt;]<br /> | |||
Eigenmonzos: 2, 9/7<br /> | |||
<br /> | |||
Algebraic generator: Squarto, the positive root of 8x^2-4x-9, at 506.3239 cents, equal to (1+sqrt(19))/4.<br /> | |||
<br /> | |||
Map: [&lt;1 0 -4 17|, &lt;0 1 4 -9|]<br /> | |||
Generators: 2, 3<br /> | |||
<br /> | |||
<!-- ws:start:WikiTextHeadingRule:10:&lt;h3&gt; --><h3 id="toc5"><a name="x-Seven limit children-Dominant"></a><!-- ws:end:WikiTextHeadingRule:10 -->Dominant</h3> | |||
The wedgie for dominant is &lt;&lt;1 4 -2 4 -6 -16||. Now the interval class for 7 is obtained from two fourths in succession, so that 7/4 is a minor seventh. The 7/6 interval is, like 6/5, now a minor third, and 7/5 is a diminished fifth. An excellent tuning for dominant is <a class="wiki_link" href="/12edo">12edo</a>, but it also works well with Pythagorean tuning of pure 3/2 fifths, and with <a class="wiki_link" href="/29edo">29edo</a>, <a class="wiki_link" href="/41edo">41edo</a>, or <a class="wiki_link" href="/53edo">53edo</a>.<br /> | The wedgie for dominant is &lt;&lt;1 4 -2 4 -6 -16||. Now the interval class for 7 is obtained from two fourths in succession, so that 7/4 is a minor seventh. The 7/6 interval is, like 6/5, now a minor third, and 7/5 is a diminished fifth. An excellent tuning for dominant is <a class="wiki_link" href="/12edo">12edo</a>, but it also works well with Pythagorean tuning of pure 3/2 fifths, and with <a class="wiki_link" href="/29edo">29edo</a>, <a class="wiki_link" href="/41edo">41edo</a>, or <a class="wiki_link" href="/53edo">53edo</a>.<br /> | ||
<br /> | <br /> | ||
<!-- ws:start:WikiTextHeadingRule: | <!-- ws:start:WikiTextHeadingRule:12:&lt;h3&gt; --><h3 id="toc6"><a name="x-Seven limit children-Sharptone"></a><!-- ws:end:WikiTextHeadingRule:12 -->Sharptone</h3> | ||
Sharptone, with a wedgie &lt;&lt;1 4 3 4 2 -4||, is a low-accuracy temperament tempering out 21/20 and 28/27. In sharptone, a 7/4 is a major sixth, a 7/6 a whole tone, and a 7/5 a fourth. Genuinely septimal sounding harmony therefore cannot be expected, but it can be used to translate, more or less, 7-limit JI into 5-limit meantone. <a class="wiki_link" href="/12edo">12edo</a> tuning does sharptone about as well as such a thing can be done.<br /> | Sharptone, with a wedgie &lt;&lt;1 4 3 4 2 -4||, is a low-accuracy temperament tempering out 21/20 and 28/27. In sharptone, a 7/4 is a major sixth, a 7/6 a whole tone, and a 7/5 a fourth. Genuinely septimal sounding harmony therefore cannot be expected, but it can be used to translate, more or less, 7-limit JI into 5-limit meantone. <a class="wiki_link" href="/12edo">12edo</a> tuning does sharptone about as well as such a thing can be done.<br /> | ||
<br /> | <br /> | ||
<!-- ws:start:WikiTextHeadingRule: | <!-- ws:start:WikiTextHeadingRule:14:&lt;h3&gt; --><h3 id="toc7"><a name="x-Seven limit children-Injera"></a><!-- ws:end:WikiTextHeadingRule:14 -->Injera</h3> | ||
The wedgie for injera is &lt;&lt;2 8 8 8 7 -4||, which tells us it has a half-octave period and a generator which can be taken as a fifth or fourth, but also as a 15/14 semitone difference between a half-octave and a perfect fifth. Injera tempers out 50/49, equating 7/5 with 10/7 and giving a tritone of half an octave. A major third up from this tritone is the 7/4. <a class="wiki_link" href="/38edo">38edo</a>, which is two parallel 19edos, is an excellent tuning for injera.<br /> | The wedgie for injera is &lt;&lt;2 8 8 8 7 -4||, which tells us it has a half-octave period and a generator which can be taken as a fifth or fourth, but also as a 15/14 semitone difference between a half-octave and a perfect fifth. Injera tempers out 50/49, equating 7/5 with 10/7 and giving a tritone of half an octave. A major third up from this tritone is the 7/4. <a class="wiki_link" href="/38edo">38edo</a>, which is two parallel 19edos, is an excellent tuning for injera.<br /> | ||
<br /> | <br /> | ||
<!-- ws:start:WikiTextHeadingRule: | <!-- ws:start:WikiTextHeadingRule:16:&lt;h3&gt; --><h3 id="toc8"><a name="x-Seven limit children-Godzilla"></a><!-- ws:end:WikiTextHeadingRule:16 -->Godzilla</h3> | ||
Godzilla has wedgie &lt;&lt;2 8 1 8 -4 -20||, and tempers out 49/48, equating 8/7 with 7/6. Two of the step-and-a-half intervals these represent give a fourth, and so step-and-a-half generators generate godzilla. <a class="wiki_link" href="/19edo">19edo</a> is the perfect godzilla tuning, so much so that's there's not much point in looking elsewhere. Hence it can be more or less equated with taking 4/19 as a generator. Godzilla is not well supplied with good <a class="wiki_link" href="/MOSScales">MOS scales</a>, though it has a pentatonic scale which could serve as an alternative to <a class="wiki_link" href="/5edo">5edo</a>, but other options exist for those wanting to explore it.<br /> | Godzilla has wedgie &lt;&lt;2 8 1 8 -4 -20||, and tempers out 49/48, equating 8/7 with 7/6. Two of the step-and-a-half intervals these represent give a fourth, and so step-and-a-half generators generate godzilla. <a class="wiki_link" href="/19edo">19edo</a> is the perfect godzilla tuning, so much so that's there's not much point in looking elsewhere. Hence it can be more or less equated with taking 4/19 as a generator. Godzilla is not well supplied with good <a class="wiki_link" href="/MOSScales">MOS scales</a>, though it has a pentatonic scale which could serve as an alternative to <a class="wiki_link" href="/5edo">5edo</a>, but other options exist for those wanting to explore it.<br /> | ||
<br /> | <br /> | ||
<!-- ws:start:WikiTextHeadingRule: | <!-- ws:start:WikiTextHeadingRule:18:&lt;h3&gt; --><h3 id="toc9"><a name="x-Seven limit children-Mohajira"></a><!-- ws:end:WikiTextHeadingRule:18 -->Mohajira</h3> | ||
Mohajira, with wedgie &lt;&lt;2 8 -11 8 -23 -48||, really makes more sense as an 11-limit temperament. It has a generator of a neutral third, two of which make up a fifth, and which can be taken to represent 128/105. Mohajira tempers out 6144/6125, the porwell comma. <a class="wiki_link" href="/31edo">31edo</a> makes for an excellent (7-limit) mohajira tuning, with generator 9/31. It has a 7-note MOS with three larger steps and four smaller ones, going sLsLsLs.<br /> | Mohajira, with wedgie &lt;&lt;2 8 -11 8 -23 -48||, really makes more sense as an 11-limit temperament. It has a generator of a neutral third, two of which make up a fifth, and which can be taken to represent 128/105. Mohajira tempers out 6144/6125, the porwell comma. <a class="wiki_link" href="/31edo">31edo</a> makes for an excellent (7-limit) mohajira tuning, with generator 9/31. It has a 7-note MOS with three larger steps and four smaller ones, going sLsLsLs.<br /> | ||
<br /> | <br /> | ||
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Generators: 2, 128/105<br /> | Generators: 2, 128/105<br /> | ||
<br /> | <br /> | ||
<!-- ws:start:WikiTextHeadingRule: | <!-- ws:start:WikiTextHeadingRule:20:&lt;h4&gt; --><h4 id="toc10"><a name="x-Seven limit children-Mohajira-11 limit mohajira"></a><!-- ws:end:WikiTextHeadingRule:20 -->11 limit mohajira</h4> | ||
Commas: 81/80, 121/120, 176/175<br /> | Commas: 81/80, 121/120, 176/175<br /> | ||
<br /> | <br /> | ||
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Generators: 2, 11/9<br /> | Generators: 2, 11/9<br /> | ||
<br /> | <br /> | ||
<!-- ws:start:WikiTextHeadingRule: | <!-- ws:start:WikiTextHeadingRule:22:&lt;h3&gt; --><h3 id="toc11"><a name="x-Seven limit children-Mothra"></a><!-- ws:end:WikiTextHeadingRule:22 -->Mothra</h3> | ||
Mothra, with wedgie &lt;&lt;3 12 -1 12 -10 -36||, splits the fifth into three 8/7 generators. It uses 1029/1024, the gamelisma, to accomplish this deed and also tempers out 1728/1715, the orwell comma. Using <a class="wiki_link" href="/31edo">31edo</a> with a generator of 6/31 is an excellent tuning choice. Once again something other than a MOS should be used as a scale to get the most out of mothra.<br /> | Mothra, with wedgie &lt;&lt;3 12 -1 12 -10 -36||, splits the fifth into three 8/7 generators. It uses 1029/1024, the gamelisma, to accomplish this deed and also tempers out 1728/1715, the orwell comma. Using <a class="wiki_link" href="/31edo">31edo</a> with a generator of 6/31 is an excellent tuning choice. Once again something other than a MOS should be used as a scale to get the most out of mothra.<br /> | ||
<br /> | <br /> | ||
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Generators: 2, 8/7<br /> | Generators: 2, 8/7<br /> | ||
<br /> | <br /> | ||
<!-- ws:start:WikiTextHeadingRule: | <!-- ws:start:WikiTextHeadingRule:24:&lt;h3&gt; --><h3 id="toc12"><a name="x-Seven limit children-Squares"></a><!-- ws:end:WikiTextHeadingRule:24 -->Squares</h3> | ||
Squares, with wedgie &lt;&lt;4 16 9 16 3 -24||, splits the interval of an eleventh, or 8/3, into four supermajor third (9/7) intervals, and uses it for a generator. <a class="wiki_link" href="/31edo">31edo</a>, with a generator of 11/31, makes for a good squares tuning, with 8, 11, and 14 note MOS available. Squares tempers out 2401/2400, the breedsma, as well as 2430/2401.<br /> | Squares, with wedgie &lt;&lt;4 16 9 16 3 -24||, splits the interval of an eleventh, or 8/3, into four supermajor third (9/7) intervals, and uses it for a generator. <a class="wiki_link" href="/31edo">31edo</a>, with a generator of 11/31, makes for a good squares tuning, with 8, 11, and 14 note MOS available. Squares tempers out 2401/2400, the breedsma, as well as 2430/2401.<br /> | ||
<br /> | <br /> | ||
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Generators: 2, 9/7<br /> | Generators: 2, 9/7<br /> | ||
<br /> | <br /> | ||
<!-- ws:start:WikiTextHeadingRule: | <!-- ws:start:WikiTextHeadingRule:26:&lt;h3&gt; --><h3 id="toc13"><a name="x-Seven limit children-Liese"></a><!-- ws:end:WikiTextHeadingRule:26 -->Liese</h3> | ||
Liese, with wedgie &lt;&lt;3 12 11 12 9 -8||, splits the twelfth interval of 3/1 into three generators of 10/7, using the comma 1029/1000. It also tempers out 686/675, the senga. <a class="wiki_link" href="/74edo">74edo</a> makes for a good liese tuning, though <a class="wiki_link" href="/19edo">19edo</a> can be used. The tuning is well-supplied with MOS: 7, 9, 11, 13, 15, 17, 19, 36, 55.<br /> | Liese, with wedgie &lt;&lt;3 12 11 12 9 -8||, splits the twelfth interval of 3/1 into three generators of 10/7, using the comma 1029/1000. It also tempers out 686/675, the senga. <a class="wiki_link" href="/74edo">74edo</a> makes for a good liese tuning, though <a class="wiki_link" href="/19edo">19edo</a> can be used. The tuning is well-supplied with MOS: 7, 9, 11, 13, 15, 17, 19, 36, 55.<br /> | ||
<br /> | <br /> | ||