33edo: Difference between revisions

Revision as of 19:29, 28 July 2011

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This revision was by author genewardsmith and made on 2011-07-28 19:29:38 UTC.

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The //33 equal division// divides the [[octave]] into 33 equal parts of 36.3636 [[cent]]s each. It is not especially good at representing all rational intervals in the [[7-limit]], but it does very well on the 7-limit [[k*N subgroups|3*33 subgroup]] 2.27.15.21. On this subgroup it tunes things to the same tuning as [[99edo]], and as a subgroup patent val it tempers out the same commas. The 99 equal temperaments hemififths, amity, parakleismic, hemiwuerschmidt, ennealimmal and hendecatonic can be reduced to this subgroup and give various possibilities for MOS scales, etc.

While relatively uncommon, 33edo is actually quite an interesting system. As a multiple of [[11edo]], it approximates the 7th and 11th harmonics via Andrew Heathwaite's 4L+3s Orgone modes (see [[26edo]]). 33edo also tunes the 13th harmonic slightly flat, allowing it to approximate the 21st and 17th harmonics as well, having an [[3L 7s|3L+7s]] of L=4 s=3. It tunes the perfect fifth about 11 cents flat, to 19\33, so that two fifths down an octave, 5\33, the approximation of 9/8, is actually half a cent flat from 10/9. The <33 52 76| or 33c val tempers out 81/80 and so leads to a very flat meantone tuning where the major tone is approximately 10/9 in size. Leaving the scale be would result in a flat-tone [[5L 2s|5L+2s]] of L=5 s=4

Instead of the flat 19\33 fifth you may use the sharp fifth of 20\33, over 25 cents sharp. Two of these lead to a 9/8 of 7\33, which is about 22/19 in size and may be counted as a small third. Between the flat 5\33 version of 9/8 and the sharp 7\33 version there is, of course, a 6\33 = 2\11 [[11edo]] interval of 218 cents. Now 6\33 + 5\33 = 11\33 = 1\3 of an octave, or 400 cents, the same major third as 12edo. Also, we have both a 327 minor third from 9\33 = 3\11, the same as the [[22edo]] minor third, and a flatter 8\33 third of 290 cents, which if you like could also be called a flat 19th harmonic, but much more accurately a 13/11 sharp by 1.7 cents. Another talent it has is that 7/5 is tuned quite accurately by 16\33, and we may put two 8\33 versions of 13/11 together to produce the [[cuthbert triad]]. So while it might not be the most harmonically accurate temperament, it's structurally quite interesting, and it approximates the full 19-limit consort in it's way. You could even say it tunes the 23rd and 29th harmonics ten cents flat if you were so inclined; as well as getting within two cents of the 37th. 

0: 00.000 1/1
1: 36.364 48/47
2: 72.727 24/23
3: 109.091 16/15 17/16
4: 145.455 12/11
5: 181.818 10/9
6: 218.182 8/7 9/8 17/15
7: 254.545 7/6 22/19 37/32
8: 290.909 13/1 19/16
9: 327.273 6/5
10: 363.636 16/13 21/17
11: 400.000 5/4
12: 436.364 9/7
13: 472.727 21/16
14: 509.091 4/3
15: 545.455 11/8
16: 581.818 7/5
17: 618.182 10/7 23/16
18: 654.545 19/13 16/11 
19: 690.909 3/2
20: 727.273 32/21
21: 763.636 14/9
22: 800.000 19/12 8/5
23: 836.364 13/8
24: 872.727 5/3
25: 909.091 22/13
26: 945.455 19/11 12/7
27: 981.818 7/4
28: 1018.182 9/5
29: 1054.545 11/6
30: 1090.909 15/8
31: 1127.273 23/12
32: 1163.636 47/24
33: 1200.000 2/1

Original HTML content:

<html><head><title>33edo</title></head><body>The <em>33 equal division</em> divides the <a class="wiki_link" href="/octave">octave</a> into 33 equal parts of 36.3636 <a class="wiki_link" href="/cent">cent</a>s each. It is not especially good at representing all rational intervals in the <a class="wiki_link" href="/7-limit">7-limit</a>, but it does very well on the 7-limit <a class="wiki_link" href="/k%2AN%20subgroups">3*33 subgroup</a> 2.27.15.21. On this subgroup it tunes things to the same tuning as <a class="wiki_link" href="/99edo">99edo</a>, and as a subgroup patent val it tempers out the same commas. The 99 equal temperaments hemififths, amity, parakleismic, hemiwuerschmidt, ennealimmal and hendecatonic can be reduced to this subgroup and give various possibilities for MOS scales, etc.<br />
<br />
While relatively uncommon, 33edo is actually quite an interesting system. As a multiple of <a class="wiki_link" href="/11edo">11edo</a>, it approximates the 7th and 11th harmonics via Andrew Heathwaite's 4L+3s Orgone modes (see <a class="wiki_link" href="/26edo">26edo</a>). 33edo also tunes the 13th harmonic slightly flat, allowing it to approximate the 21st and 17th harmonics as well, having an <a class="wiki_link" href="/3L%207s">3L+7s</a> of L=4 s=3. It tunes the perfect fifth about 11 cents flat, to 19\33, so that two fifths down an octave, 5\33, the approximation of 9/8, is actually half a cent flat from 10/9. The &lt;33 52 76| or 33c val tempers out 81/80 and so leads to a very flat meantone tuning where the major tone is approximately 10/9 in size. Leaving the scale be would result in a flat-tone <a class="wiki_link" href="/5L%202s">5L+2s</a> of L=5 s=4<br />
<br />
Instead of the flat 19\33 fifth you may use the sharp fifth of 20\33, over 25 cents sharp. Two of these lead to a 9/8 of 7\33, which is about 22/19 in size and may be counted as a small third. Between the flat 5\33 version of 9/8 and the sharp 7\33 version there is, of course, a 6\33 = 2\11 <a class="wiki_link" href="/11edo">11edo</a> interval of 218 cents. Now 6\33 + 5\33 = 11\33 = 1\3 of an octave, or 400 cents, the same major third as 12edo. Also, we have both a 327 minor third from 9\33 = 3\11, the same as the <a class="wiki_link" href="/22edo">22edo</a> minor third, and a flatter 8\33 third of 290 cents, which if you like could also be called a flat 19th harmonic, but much more accurately a 13/11 sharp by 1.7 cents. Another talent it has is that 7/5 is tuned quite accurately by 16\33, and we may put two 8\33 versions of 13/11 together to produce the <a class="wiki_link" href="/cuthbert%20triad">cuthbert triad</a>. So while it might not be the most harmonically accurate temperament, it's structurally quite interesting, and it approximates the full 19-limit consort in it's way. You could even say it tunes the 23rd and 29th harmonics ten cents flat if you were so inclined; as well as getting within two cents of the 37th. <br />
<br />
0: 00.000 1/1<br />
1: 36.364 48/47<br />
2: 72.727 24/23<br />
3: 109.091 16/15 17/16<br />
4: 145.455 12/11<br />
5: 181.818 10/9<br />
6: 218.182 8/7 9/8 17/15<br />
7: 254.545 7/6 22/19 37/32<br />
8: 290.909 13/1 19/16<br />
9: 327.273 6/5<br />
10: 363.636 16/13 21/17<br />
11: 400.000 5/4<br />
12: 436.364 9/7<br />
13: 472.727 21/16<br />
14: 509.091 4/3<br />
15: 545.455 11/8<br />
16: 581.818 7/5<br />
17: 618.182 10/7 23/16<br />
18: 654.545 19/13 16/11 <br />
19: 690.909 3/2<br />
20: 727.273 32/21<br />
21: 763.636 14/9<br />
22: 800.000 19/12 8/5<br />
23: 836.364 13/8<br />
24: 872.727 5/3<br />
25: 909.091 22/13<br />
26: 945.455 19/11 12/7<br />
27: 981.818 7/4<br />
28: 1018.182 9/5<br />
29: 1054.545 11/6<br />
30: 1090.909 15/8<br />
31: 1127.273 23/12<br />
32: 1163.636 47/24<br />
33: 1200.000 2/1</body></html>

33edo: Difference between revisions

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