27edo: Difference between revisions
Wikispaces>hstraub **Imported revision 239087289 - Original comment: ** |
Wikispaces>igliashon **Imported revision 242758149 - 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: | : 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> | : 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> | ||
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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, | || 0 || 0 ||= 1/1 || | ||
|| 2 || 88 | || 1 || 44.44 ||= 36/35, 49/48, 50/49 || | ||
|| 3 || 133, | || 2 || 88.89 ||= 21/20 || | ||
|| 4 || 177 | || 3 || 133.33 ||= 14/13, 13/12 || | ||
|| 5 || 222, | || 4 || 177.78 ||= 10/9 || | ||
|| 6 || 266 | || 5 || 222.22 ||= 8/7, 9/8 || | ||
|| 7 || 311 | || 6 || 266.67 ||= 7/6 || | ||
|| 8 || 355 | || 7 || 311.11 ||= 6/5 || | ||
|| 9 || 400 || | || 8 || 355.56 ||= 16/13 || | ||
|| 10 || 444, | || 9 || 400 ||= 5/4 || | ||
|| 11 || 488 | || 10 || 444.44 ||= 9/7, 13/10 || | ||
|| 12 || 533, | || 11 || 488.89 ||= 4/3 || | ||
|| 13 || 577 | || 12 || 533.33 ||= 49/36, 48/35 || | ||
|| 14 || 622 | || 13 || 577.78 ||= 7/5 || | ||
|| 15 || 666, | || 14 || 622.22 ||= 10/7 || | ||
|| 16 || 711 | || 15 || 666.67 ||= 72/49, 35/24 || | ||
|| 17 || 755 | || 16 || 711.11 ||= 3/2 || | ||
|| 18 || 800 || | || 17 || 755.56 ||= 14/9 || | ||
|| 19 || 844 | || 18 || 800 ||= 8/5 || | ||
|| 20 || 888 | || 19 || 844.44 ||= 13/8 || | ||
|| 21 || 933 | || 20 || 888.89 ||= 5/3 || | ||
|| 22 || 977 | || 21 || 933.33 ||= 12/7 || | ||
|| 23 || 1022, | || 22 || 977.78 ||= 7/4 || | ||
|| 24 || 1066,67 || | || 23 || 1022.22 ||= 9/5, 16/9 || | ||
|| 25 || 1111 | || 24 || 1066,67 ||= 13/7, 24/13 || | ||
|| 26 || 1155, | || 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 < 27 43 63 76 93 100 |.) | 27 EDO tempers out the following commas. (Note: This assumes the val < 27 43 63 76 93 100 |.) | ||
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27edo, with its 400 cent major third, tempers out the <a class="wiki_link" href="/diesis">diesis</a> of 128/125, and also the <a class="wiki_link" href="/septimal%20comma">septimal comma</a>, 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 <a class="wiki_link" href="/22edo">22edo</a> tempering out the allegedly Bohlen-Pierce comma 245/243 as well as 64/63, so that they both support superpyth temperament, with quite sharp &quot;superpythagorean&quot; fifths giving a sharp 9/7 in place of meantone's 5/4.<br /> | 27edo, with its 400 cent major third, tempers out the <a class="wiki_link" href="/diesis">diesis</a> of 128/125, and also the <a class="wiki_link" href="/septimal%20comma">septimal comma</a>, 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 <a class="wiki_link" href="/22edo">22edo</a> tempering out the allegedly Bohlen-Pierce comma 245/243 as well as 64/63, so that they both support superpyth temperament, with quite sharp &quot;superpythagorean&quot; fifths giving a sharp 9/7 in place of meantone's 5/4.<br /> | ||
<br /> | <br /> | ||
Though the <a class="wiki_link" href="/7-limit">7-limit</a> tuning of 27edo is not highly accurate, it nonetheless is the smallest equal division to represent the 7 odd limit both <a class="wiki_link" href="/consistent">consistent</a>ly and distinctly--that is, everything in the 7-limit <a class="wiki_link" href="/Diamonds">diamond</a> is uniquely represented by a certain number of steps of 27 equal.<br /> | Though the <a class="wiki_link" href="/7-limit">7-limit</a> tuning of 27edo is not highly accurate, it nonetheless is the smallest equal division to represent the 7 odd limit both <a class="wiki_link" href="/consistent">consistent</a>ly and distinctly--that is, everything in the 7-limit <a class="wiki_link" href="/Diamonds">diamond</a> 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<br /> | ||
<br /> | <br /> | ||
<!-- ws:start:WikiTextHeadingRule:2:&lt;h2&gt; --><h2 id="toc1"><a name="x27 tone equal tempertament-Intervals"></a><!-- ws:end:WikiTextHeadingRule:2 -->Intervals</h2> | <!-- ws:start:WikiTextHeadingRule:2:&lt;h2&gt; --><h2 id="toc1"><a name="x27 tone equal tempertament-Intervals"></a><!-- ws:end:WikiTextHeadingRule:2 -->Intervals</h2> | ||
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</td> | </td> | ||
<td>Cents value<br /> | <td>Cents value<br /> | ||
</td> | |||
<td style="text-align: center;">Approximate<br /> | |||
Ratios*<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 95: | Line 100: | ||
</td> | </td> | ||
<td>0<br /> | <td>0<br /> | ||
</td> | |||
<td style="text-align: center;">1/1<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 100: | Line 107: | ||
<td>1<br /> | <td>1<br /> | ||
</td> | </td> | ||
<td>44, | <td>44.44<br /> | ||
</td> | |||
<td style="text-align: center;">36/35, 49/48, 50/49<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 106: | Line 115: | ||
<td>2<br /> | <td>2<br /> | ||
</td> | </td> | ||
<td>88 | <td>88.89<br /> | ||
</td> | |||
<td style="text-align: center;">21/20<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 112: | Line 123: | ||
<td>3<br /> | <td>3<br /> | ||
</td> | </td> | ||
<td>133, | <td>133.33<br /> | ||
</td> | |||
<td style="text-align: center;">14/13, 13/12<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 118: | Line 131: | ||
<td>4<br /> | <td>4<br /> | ||
</td> | </td> | ||
<td>177 | <td>177.78<br /> | ||
</td> | |||
<td style="text-align: center;">10/9<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
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<td>5<br /> | <td>5<br /> | ||
</td> | </td> | ||
<td>222, | <td>222.22<br /> | ||
</td> | |||
<td style="text-align: center;">8/7, 9/8<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 130: | Line 147: | ||
<td>6<br /> | <td>6<br /> | ||
</td> | </td> | ||
<td>266 | <td>266.67<br /> | ||
</td> | |||
<td style="text-align: center;">7/6<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 136: | Line 155: | ||
<td>7<br /> | <td>7<br /> | ||
</td> | </td> | ||
<td>311 | <td>311.11<br /> | ||
</td> | |||
<td style="text-align: center;">6/5<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 142: | Line 163: | ||
<td>8<br /> | <td>8<br /> | ||
</td> | </td> | ||
<td>355 | <td>355.56<br /> | ||
</td> | |||
<td style="text-align: center;">16/13<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 149: | Line 172: | ||
</td> | </td> | ||
<td>400<br /> | <td>400<br /> | ||
</td> | |||
<td style="text-align: center;">5/4<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 154: | Line 179: | ||
<td>10<br /> | <td>10<br /> | ||
</td> | </td> | ||
<td>444, | <td>444.44<br /> | ||
</td> | |||
<td style="text-align: center;">9/7, 13/10<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
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<td>11<br /> | <td>11<br /> | ||
</td> | </td> | ||
<td>488 | <td>488.89<br /> | ||
</td> | |||
<td style="text-align: center;">4/3<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 166: | Line 195: | ||
<td>12<br /> | <td>12<br /> | ||
</td> | </td> | ||
<td>533, | <td>533.33<br /> | ||
</td> | |||
<td style="text-align: center;">49/36, 48/35<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 172: | Line 203: | ||
<td>13<br /> | <td>13<br /> | ||
</td> | </td> | ||
<td>577 | <td>577.78<br /> | ||
</td> | |||
<td style="text-align: center;">7/5<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 178: | Line 211: | ||
<td>14<br /> | <td>14<br /> | ||
</td> | </td> | ||
<td>622 | <td>622.22<br /> | ||
</td> | |||
<td style="text-align: center;">10/7<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 184: | Line 219: | ||
<td>15<br /> | <td>15<br /> | ||
</td> | </td> | ||
<td>666, | <td>666.67<br /> | ||
</td> | |||
<td style="text-align: center;">72/49, 35/24<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 190: | Line 227: | ||
<td>16<br /> | <td>16<br /> | ||
</td> | </td> | ||
<td>711 | <td>711.11<br /> | ||
</td> | |||
<td style="text-align: center;">3/2<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 196: | Line 235: | ||
<td>17<br /> | <td>17<br /> | ||
</td> | </td> | ||
<td>755 | <td>755.56<br /> | ||
</td> | |||
<td style="text-align: center;">14/9<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 203: | Line 244: | ||
</td> | </td> | ||
<td>800<br /> | <td>800<br /> | ||
</td> | |||
<td style="text-align: center;">8/5<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 208: | Line 251: | ||
<td>19<br /> | <td>19<br /> | ||
</td> | </td> | ||
<td>844 | <td>844.44<br /> | ||
</td> | |||
<td style="text-align: center;">13/8<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 214: | Line 259: | ||
<td>20<br /> | <td>20<br /> | ||
</td> | </td> | ||
<td>888 | <td>888.89<br /> | ||
</td> | |||
<td style="text-align: center;">5/3<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 220: | Line 267: | ||
<td>21<br /> | <td>21<br /> | ||
</td> | </td> | ||
<td>933 | <td>933.33<br /> | ||
</td> | |||
<td style="text-align: center;">12/7<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
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<td>22<br /> | <td>22<br /> | ||
</td> | </td> | ||
<td>977 | <td>977.78<br /> | ||
</td> | |||
<td style="text-align: center;">7/4<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 232: | Line 283: | ||
<td>23<br /> | <td>23<br /> | ||
</td> | </td> | ||
<td>1022, | <td>1022.22<br /> | ||
</td> | |||
<td style="text-align: center;">9/5, 16/9<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
| Line 239: | Line 292: | ||
</td> | </td> | ||
<td>1066,67<br /> | <td>1066,67<br /> | ||
</td> | |||
<td style="text-align: center;">13/7, 24/13<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
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<td>25<br /> | <td>25<br /> | ||
</td> | </td> | ||
<td>1111 | <td>1111.11<br /> | ||
</td> | |||
<td style="text-align: center;">40/21<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||
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<td>26<br /> | <td>26<br /> | ||
</td> | </td> | ||
<td>1155, | <td>1155.56<br /> | ||
</td> | |||
<td style="text-align: center;">35/18, 96/49, 49/25<br /> | |||
</td> | |||
</tr> | |||
<tr> | |||
<td>27<br /> | |||
</td> | |||
<td>1200<br /> | |||
</td> | |||
<td style="text-align: center;">2/1<br /> | |||
</td> | </td> | ||
</tr> | </tr> | ||