27edo: Difference between revisions

Wikispaces>hstraub
**Imported revision 239087289 - Original comment: **
Wikispaces>igliashon
**Imported revision 242758149 - Original comment: **
Line 1: Line 1:
<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:hstraub|hstraub]] and made on <tt>2011-06-28 03:01:12 UTC</tt>.<br>
: This revision was by author [[User:igliashon|igliashon]] and made on <tt>2011-07-25 13:25:14 UTC</tt>.<br>
: The original revision id was <tt>239087289</tt>.<br>
: The original revision id was <tt>242758149</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>
Line 14: Line 14:
27edo, with its 400 cent major third, tempers out the [[diesis]] of 128/125, and also the [[septimal comma]], 64/63 (and hence 126/125 also.) These it shares with 12edo, making some relationships familiar, and as a consequence they both support augene temperament. It shares with [[22edo]] tempering out the allegedly Bohlen-Pierce comma 245/243 as well as 64/63, so that they both support superpyth temperament, with quite sharp "superpythagorean" fifths giving a sharp 9/7 in place of meantone's 5/4.
27edo, with its 400 cent major third, tempers out the [[diesis]] of 128/125, and also the [[septimal comma]], 64/63 (and hence 126/125 also.) These it shares with 12edo, making some relationships familiar, and as a consequence they both support augene temperament. It shares with [[22edo]] tempering out the allegedly Bohlen-Pierce comma 245/243 as well as 64/63, so that they both support superpyth temperament, with quite sharp "superpythagorean" fifths giving a sharp 9/7 in place of meantone's 5/4.


Though the [[7-limit]] tuning of 27edo is not highly accurate, it nonetheless is the smallest equal division to represent the 7 odd limit both [[consistent]]ly and distinctly--that is, everything in the 7-limit [[Diamonds|diamond]] is uniquely represented by a certain number of steps of 27 equal.
Though the [[7-limit]] tuning of 27edo is not highly accurate, it nonetheless is the smallest equal division to represent the 7 odd limit both [[consistent]]ly and distinctly--that is, everything in the 7-limit [[Diamonds|diamond]] is uniquely represented by a certain number of steps of 27 equal. It also represents the 13th harmonic very well, and performs quite decently as a 2.3.5.7.13 temperament


==Intervals==  
==Intervals==  
|| Degrees of 27-EDO || Cents value ||
|| Degrees of 27-EDO || Cents value ||= Approximate
|| 0 || 0 ||
Ratios* ||
|| 1 || 44,44 ||
|| 0 || 0 ||= 1/1 ||
|| 2 || 88,89 ||
|| 1 || 44.44 ||= 36/35, 49/48, 50/49 ||
|| 3 || 133,33 ||
|| 2 || 88.89 ||= 21/20 ||
|| 4 || 177,78 ||
|| 3 || 133.33 ||= 14/13, 13/12 ||
|| 5 || 222,22 ||
|| 4 || 177.78 ||= 10/9 ||
|| 6 || 266,67 ||
|| 5 || 222.22 ||= 8/7, 9/8 ||
|| 7 || 311,11 ||
|| 6 || 266.67 ||= 7/6 ||
|| 8 || 355,56 ||
|| 7 || 311.11 ||= 6/5 ||
|| 9 || 400 ||
|| 8 || 355.56 ||= 16/13 ||
|| 10 || 444,44 ||
|| 9 || 400 ||= 5/4 ||
|| 11 || 488,89 ||
|| 10 || 444.44 ||= 9/7, 13/10 ||
|| 12 || 533,33 ||
|| 11 || 488.89 ||= 4/3 ||
|| 13 || 577,78 ||
|| 12 || 533.33 ||= 49/36, 48/35 ||
|| 14 || 622,22 ||
|| 13 || 577.78 ||= 7/5 ||
|| 15 || 666,67 ||
|| 14 || 622.22 ||= 10/7 ||
|| 16 || 711,11 ||
|| 15 || 666.67 ||= 72/49, 35/24 ||
|| 17 || 755,56 ||
|| 16 || 711.11 ||= 3/2 ||
|| 18 || 800 ||
|| 17 || 755.56 ||= 14/9 ||
|| 19 || 844,44 ||
|| 18 || 800 ||= 8/5 ||
|| 20 || 888,89 ||
|| 19 || 844.44 ||= 13/8 ||
|| 21 || 933,33 ||
|| 20 || 888.89 ||= 5/3 ||
|| 22 || 977,78 ||
|| 21 || 933.33 ||= 12/7 ||
|| 23 || 1022,22 ||
|| 22 || 977.78 ||= 7/4 ||
|| 24 || 1066,67 ||
|| 23 || 1022.22 ||= 9/5, 16/9 ||
|| 25 || 1111,11 ||
|| 24 || 1066,67 ||= 13/7, 24/13 ||
|| 26 || 1155,56 ||
|| 25 || 1111.11 ||= 40/21 ||
|| 26 || 1155.56 ||= 35/18, 96/49, 49/25 ||
|| 27 || 1200 ||= 2/1 ||
==Commas==  
==Commas==  
27 EDO tempers out the following commas. (Note: This assumes the val &lt; 27 43 63 76 93 100 |.)
27 EDO tempers out the following commas. (Note: This assumes the val &lt; 27 43 63 76 93 100 |.)
Line 79: Line 81:
27edo, with its 400 cent major third, tempers out the &lt;a class="wiki_link" href="/diesis"&gt;diesis&lt;/a&gt; of 128/125, and also the &lt;a class="wiki_link" href="/septimal%20comma"&gt;septimal comma&lt;/a&gt;, 64/63 (and hence 126/125 also.) These it shares with 12edo, making some relationships familiar, and as a consequence they both support augene temperament. It shares with &lt;a class="wiki_link" href="/22edo"&gt;22edo&lt;/a&gt; tempering out the allegedly Bohlen-Pierce comma 245/243 as well as 64/63, so that they both support superpyth temperament, with quite sharp &amp;quot;superpythagorean&amp;quot; fifths giving a sharp 9/7 in place of meantone's 5/4.&lt;br /&gt;
27edo, with its 400 cent major third, tempers out the &lt;a class="wiki_link" href="/diesis"&gt;diesis&lt;/a&gt; of 128/125, and also the &lt;a class="wiki_link" href="/septimal%20comma"&gt;septimal comma&lt;/a&gt;, 64/63 (and hence 126/125 also.) These it shares with 12edo, making some relationships familiar, and as a consequence they both support augene temperament. It shares with &lt;a class="wiki_link" href="/22edo"&gt;22edo&lt;/a&gt; tempering out the allegedly Bohlen-Pierce comma 245/243 as well as 64/63, so that they both support superpyth temperament, with quite sharp &amp;quot;superpythagorean&amp;quot; fifths giving a sharp 9/7 in place of meantone's 5/4.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Though the &lt;a class="wiki_link" href="/7-limit"&gt;7-limit&lt;/a&gt; tuning of 27edo is not highly accurate, it nonetheless is the smallest equal division to represent the 7 odd limit both &lt;a class="wiki_link" href="/consistent"&gt;consistent&lt;/a&gt;ly and distinctly--that is, everything in the 7-limit &lt;a class="wiki_link" href="/Diamonds"&gt;diamond&lt;/a&gt; is uniquely represented by a certain number of steps of 27 equal.&lt;br /&gt;
Though the &lt;a class="wiki_link" href="/7-limit"&gt;7-limit&lt;/a&gt; tuning of 27edo is not highly accurate, it nonetheless is the smallest equal division to represent the 7 odd limit both &lt;a class="wiki_link" href="/consistent"&gt;consistent&lt;/a&gt;ly and distinctly--that is, everything in the 7-limit &lt;a class="wiki_link" href="/Diamonds"&gt;diamond&lt;/a&gt; is uniquely represented by a certain number of steps of 27 equal. It also represents the 13th harmonic very well, and performs quite decently as a 2.3.5.7.13 temperament&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;!-- ws:start:WikiTextHeadingRule:2:&amp;lt;h2&amp;gt; --&gt;&lt;h2 id="toc1"&gt;&lt;a name="x27 tone equal tempertament-Intervals"&gt;&lt;/a&gt;&lt;!-- ws:end:WikiTextHeadingRule:2 --&gt;Intervals&lt;/h2&gt;
&lt;!-- ws:start:WikiTextHeadingRule:2:&amp;lt;h2&amp;gt; --&gt;&lt;h2 id="toc1"&gt;&lt;a name="x27 tone equal tempertament-Intervals"&gt;&lt;/a&gt;&lt;!-- ws:end:WikiTextHeadingRule:2 --&gt;Intervals&lt;/h2&gt;
Line 89: Line 91:
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;Cents value&lt;br /&gt;
         &lt;td&gt;Cents value&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;Approximate&lt;br /&gt;
Ratios*&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 95: Line 100:
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;0&lt;br /&gt;
         &lt;td&gt;0&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;1/1&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 100: Line 107:
         &lt;td&gt;1&lt;br /&gt;
         &lt;td&gt;1&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;44,44&lt;br /&gt;
         &lt;td&gt;44.44&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;36/35, 49/48, 50/49&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 106: Line 115:
         &lt;td&gt;2&lt;br /&gt;
         &lt;td&gt;2&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;88,89&lt;br /&gt;
         &lt;td&gt;88.89&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;21/20&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 112: Line 123:
         &lt;td&gt;3&lt;br /&gt;
         &lt;td&gt;3&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;133,33&lt;br /&gt;
         &lt;td&gt;133.33&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;14/13, 13/12&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 118: Line 131:
         &lt;td&gt;4&lt;br /&gt;
         &lt;td&gt;4&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;177,78&lt;br /&gt;
         &lt;td&gt;177.78&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;10/9&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 124: Line 139:
         &lt;td&gt;5&lt;br /&gt;
         &lt;td&gt;5&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;222,22&lt;br /&gt;
         &lt;td&gt;222.22&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;8/7, 9/8&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 130: Line 147:
         &lt;td&gt;6&lt;br /&gt;
         &lt;td&gt;6&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;266,67&lt;br /&gt;
         &lt;td&gt;266.67&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;7/6&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 136: Line 155:
         &lt;td&gt;7&lt;br /&gt;
         &lt;td&gt;7&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;311,11&lt;br /&gt;
         &lt;td&gt;311.11&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;6/5&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 142: Line 163:
         &lt;td&gt;8&lt;br /&gt;
         &lt;td&gt;8&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;355,56&lt;br /&gt;
         &lt;td&gt;355.56&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;16/13&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 149: Line 172:
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;400&lt;br /&gt;
         &lt;td&gt;400&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;5/4&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 154: Line 179:
         &lt;td&gt;10&lt;br /&gt;
         &lt;td&gt;10&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;444,44&lt;br /&gt;
         &lt;td&gt;444.44&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;9/7, 13/10&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 160: Line 187:
         &lt;td&gt;11&lt;br /&gt;
         &lt;td&gt;11&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;488,89&lt;br /&gt;
         &lt;td&gt;488.89&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;4/3&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 166: Line 195:
         &lt;td&gt;12&lt;br /&gt;
         &lt;td&gt;12&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;533,33&lt;br /&gt;
         &lt;td&gt;533.33&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;49/36, 48/35&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 172: Line 203:
         &lt;td&gt;13&lt;br /&gt;
         &lt;td&gt;13&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;577,78&lt;br /&gt;
         &lt;td&gt;577.78&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;7/5&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 178: Line 211:
         &lt;td&gt;14&lt;br /&gt;
         &lt;td&gt;14&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;622,22&lt;br /&gt;
         &lt;td&gt;622.22&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;10/7&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 184: Line 219:
         &lt;td&gt;15&lt;br /&gt;
         &lt;td&gt;15&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;666,67&lt;br /&gt;
         &lt;td&gt;666.67&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;72/49, 35/24&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 190: Line 227:
         &lt;td&gt;16&lt;br /&gt;
         &lt;td&gt;16&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;711,11&lt;br /&gt;
         &lt;td&gt;711.11&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;3/2&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 196: Line 235:
         &lt;td&gt;17&lt;br /&gt;
         &lt;td&gt;17&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;755,56&lt;br /&gt;
         &lt;td&gt;755.56&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;14/9&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 203: Line 244:
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;800&lt;br /&gt;
         &lt;td&gt;800&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;8/5&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 208: Line 251:
         &lt;td&gt;19&lt;br /&gt;
         &lt;td&gt;19&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;844,44&lt;br /&gt;
         &lt;td&gt;844.44&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;13/8&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 214: Line 259:
         &lt;td&gt;20&lt;br /&gt;
         &lt;td&gt;20&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;888,89&lt;br /&gt;
         &lt;td&gt;888.89&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;5/3&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 220: Line 267:
         &lt;td&gt;21&lt;br /&gt;
         &lt;td&gt;21&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;933,33&lt;br /&gt;
         &lt;td&gt;933.33&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;12/7&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 226: Line 275:
         &lt;td&gt;22&lt;br /&gt;
         &lt;td&gt;22&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;977,78&lt;br /&gt;
         &lt;td&gt;977.78&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;7/4&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 232: Line 283:
         &lt;td&gt;23&lt;br /&gt;
         &lt;td&gt;23&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;1022,22&lt;br /&gt;
         &lt;td&gt;1022.22&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;9/5, 16/9&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 239: Line 292:
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;1066,67&lt;br /&gt;
         &lt;td&gt;1066,67&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;13/7, 24/13&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 244: Line 299:
         &lt;td&gt;25&lt;br /&gt;
         &lt;td&gt;25&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;1111,11&lt;br /&gt;
         &lt;td&gt;1111.11&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;40/21&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;
Line 250: Line 307:
         &lt;td&gt;26&lt;br /&gt;
         &lt;td&gt;26&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
         &lt;td&gt;1155,56&lt;br /&gt;
         &lt;td&gt;1155.56&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;35/18, 96/49, 49/25&lt;br /&gt;
&lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
        &lt;td&gt;27&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;1200&lt;br /&gt;
&lt;/td&gt;
        &lt;td style="text-align: center;"&gt;2/1&lt;br /&gt;
&lt;/td&gt;
&lt;/td&gt;
     &lt;/tr&gt;
     &lt;/tr&gt;