Star and Nova: Difference between revisions
Wikispaces>genewardsmith **Imported revision 362095068 - Original comment: ** |
Wikispaces>genewardsmith **Imported revision 362253248 - 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>2012-09- | : This revision was by author [[User:genewardsmith|genewardsmith]] and made on <tt>2012-09-05 12:46:30 UTC</tt>.<br> | ||
: The original revision id was <tt> | : The original revision id was <tt>362253248</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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=Star= | =Star= | ||
==Star transversal== | ==Star transversal== | ||
Star is an eight-note tempered scale, with something of the sound of the [[octatonic scale]]; however it is less regular and closer to just intonation. Star can be reached from various starting points, one of which is a 5-limit [[Fokker blocks|Fokker block]] which serves as a [[transversal]] for | Star is an eight-note tempered scale, with something of the sound of the [[octatonic scale]]; however it is less regular and closer to just intonation. Star can be reached from various starting points, one of which is a 5-limit [[Fokker blocks|Fokker block]] which serves as a [[transversal]] for Star. The block in question is [[smithgw_star]], 25/24-6/5-5/4-36/25-3/2-5/3-9/5-2/1, which consists of a chain of minor thirds 5/3-1-6/5-36/25 and that chain translated by 5/4, and which has three major and three minor triads. | ||
==Notes of | ==Notes of Star== | ||
By tempering out 126/125, leading to [[Starling family#x7-limit starling|7-limit starling temperament]] we add the 7-limit intervals 8/7, 7/6, 7/5 and their inversions to the mix, and by tempering by 385/384 also, leading to [[Starling family#x7-limit starling-11-limit|11-limit starling]], the 11/8 interval also. There is no significant tuning advantage to 11-limit starling, a planar temperament, over the linear temperament [[Starling temperaments#Valentine temperament-11-limit|valentine]], so we may consider | By tempering out 126/125, leading to [[Starling family#x7-limit starling|7-limit starling temperament]] we add the 7-limit intervals 8/7, 7/6, 7/5 and their inversions to the mix, and by tempering by 385/384 also, leading to [[Starling family#x7-limit starling-11-limit|11-limit starling]], the 11/8 interval also. There is no significant tuning advantage to 11-limit starling, a planar temperament, over the linear temperament [[Starling temperaments#Valentine temperament-11-limit|valentine]], so we may consider Star to be a scale of valentine. In valentine, with generator a tempered 21/20 of 78 cents, the notes of Star are -4, 0, 1, 4, 5, 8, 9 and 13 generators; in the ordering of the scale itself, that's 0, 1, 4, 5, 8, 9, -4, 13. | ||
Since there are a finite number of 11-limit 8-note [[lesfip scales]], we may consider the [[star-lesfip|lesfip version of | Since there are a finite number of 11-limit 8-note [[lesfip scales]], we may consider the [[star-lesfip|lesfip version of Star]], star-lesfip, to be canonical. It can be reached from a variety of starting points. Lesfipping the 5-limit transversal in the range 14 to 17 cents of tolerance leads to star; so does lesfipping the 46et version in the range from 9 to 17 cents or the 77et version in the range 6 to 16 cents. Another tuning for Star, not very different, is [[star|Star in 77et]]; 77 giving the optimal patent val for both 11-limit starling and valentine. | ||
==Chords of star== | ==Chords of star== | ||
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==Transformations== | ==Transformations== | ||
Star has many permutations of its notes which send dyadic chords to other dyadic chords. We may use the standard [[http://en.wikipedia.org/wiki/Cycle_notation|cycle notation]] used with permutation groups to mean permutations of the pitch classes of | Star has many permutations of its notes which send dyadic chords to other dyadic chords. We may use the standard [[http://en.wikipedia.org/wiki/Cycle_notation|cycle notation]] used with permutation groups to mean permutations of the pitch classes of Star lifted to permutations of star as a periodic scale. For instance, the cycle (01) interchanges note 0 with note 1, which also means exchanging note 8 for note 9, and in general Star[n] with Star[n+1] whenever n is divisible by 8. The four involutions (elements of order two) (01), (23), (45) and (67) all preserve the dyadic harmony character of the chords of Star, while changing the actual chords. Together, they generate an [[http://en.wikipedia.org/wiki/Elementary_abelian_group|elementary abelian 2-group]] isomorphic to (Z/2Z)^4, which means fifteen nontrivial transformations. To these may be added involutions exchanging the adjacent even-odd pairs of the previous group, so that [0 2] for instance would mean, for n divisible by 8, Star[n] changes places with Star[n+2], and Star[n+1] with Star[n+3]. These involutions generate a group of infinite order, but on pitch classes we obtain a group of order 384. This is discussed from the point of view of graph theory [[Graph-theoretic properties of scales#Examples-Star|here]]. | ||
= | =Nova= | ||
Star has a twin, | ==Nova transversal== | ||
Star has a twin, Nova, with very similar characteristics but without 11-limit harmonies. It too can be reached from various starting points. One is a 5-limit [[Fokker blocks|Fokker block]] [[transversal]], [[smithgw_star2]], 27/25-6/5-5/4-36/25-3/2-5/3-9/5-2/1, which consists of a chain of minor thirds 5/3-1-6/5-36/25 and that chain translated by 3/2 rather than 5/4, and which also has three major and three minor triads. | |||
==Notes of Nova== | |||
The transversal of Nova, when tempered by 126/125 (starling) temperament, leads to Nova. It can also be considered a scale of 7-limit valentine, for which both 77et and 185et will serve, the latter being the optimal patent val for both 7-limit starling and 7-limit valentine. In valentine, its notes in generator terms are -4, 0, 4, 5, 8, 9, 13 and 17, which in order of size are 0, 17, 4, 5, 8, 9, -4, 13. | |||
The lesfip version of Nova, [[nova-lesfip]], can be reached by lesfipping the transversal in the tolerance range 14 to 21 cents. It can also be reached from the 46et, 77et, or 185et tunings. The tolerance ranges are a little broader than those for Star since the lesfipping is done with respect to tbe 9-limit diamond; it also works from the 11-limit diamond, with narrower limits like those of Star, since then the 100/99 equivalencies must be avoided.</pre></div> | |||
<h4>Original HTML content:</h4> | <h4>Original HTML content:</h4> | ||
<div style="width:100%; max-height:400pt; overflow:auto; background-color:#f8f9fa; border: 1px solid #eaecf0; padding:0em"><pre style="margin:0px;border:none;background:none;word-wrap:break-word;width:200%;white-space: pre-wrap ! important" class="old-revision-html"><html><head><title>Star and Nova</title></head><body><!-- ws:start:WikiTextTocRule: | <div style="width:100%; max-height:400pt; overflow:auto; background-color:#f8f9fa; border: 1px solid #eaecf0; padding:0em"><pre style="margin:0px;border:none;background:none;word-wrap:break-word;width:200%;white-space: pre-wrap ! important" class="old-revision-html"><html><head><title>Star and Nova</title></head><body><!-- ws:start:WikiTextTocRule:16:&lt;img id=&quot;wikitext@@toc@@flat&quot; class=&quot;WikiMedia WikiMediaTocFlat&quot; title=&quot;Table of Contents&quot; src=&quot;/site/embedthumbnail/toc/flat?w=100&amp;h=16&quot;/&gt; --><!-- ws:end:WikiTextTocRule:16 --><!-- ws:start:WikiTextTocRule:17: --><a href="#Star">Star</a><!-- ws:end:WikiTextTocRule:17 --><!-- ws:start:WikiTextTocRule:18: --><!-- ws:end:WikiTextTocRule:18 --><!-- ws:start:WikiTextTocRule:19: --><!-- ws:end:WikiTextTocRule:19 --><!-- ws:start:WikiTextTocRule:20: --><!-- ws:end:WikiTextTocRule:20 --><!-- ws:start:WikiTextTocRule:21: --><!-- ws:end:WikiTextTocRule:21 --><!-- ws:start:WikiTextTocRule:22: --> | <a href="#Nova">Nova</a><!-- ws:end:WikiTextTocRule:22 --><!-- ws:start:WikiTextTocRule:23: --><!-- ws:end:WikiTextTocRule:23 --><!-- ws:start:WikiTextTocRule:24: --><!-- ws:end:WikiTextTocRule:24 --><!-- ws:start:WikiTextTocRule:25: --> | ||
<!-- ws:end:WikiTextTocRule: | <!-- ws:end:WikiTextTocRule:25 --><br /> | ||
<!-- ws:start:WikiTextHeadingRule:0:&lt;h1&gt; --><h1 id="toc0"><a name="Star"></a><!-- ws:end:WikiTextHeadingRule:0 -->Star</h1> | <!-- ws:start:WikiTextHeadingRule:0:&lt;h1&gt; --><h1 id="toc0"><a name="Star"></a><!-- ws:end:WikiTextHeadingRule:0 -->Star</h1> | ||
<!-- ws:start:WikiTextHeadingRule:2:&lt;h2&gt; --><h2 id="toc1"><a name="Star-Star transversal"></a><!-- ws:end:WikiTextHeadingRule:2 -->Star transversal</h2> | <!-- ws:start:WikiTextHeadingRule:2:&lt;h2&gt; --><h2 id="toc1"><a name="Star-Star transversal"></a><!-- ws:end:WikiTextHeadingRule:2 -->Star transversal</h2> | ||
Star is an eight-note tempered scale, with something of the sound of the <a class="wiki_link" href="/octatonic%20scale">octatonic scale</a>; however it is less regular and closer to just intonation. Star can be reached from various starting points, one of which is a 5-limit <a class="wiki_link" href="/Fokker%20blocks">Fokker block</a> which serves as a <a class="wiki_link" href="/transversal">transversal</a> for | Star is an eight-note tempered scale, with something of the sound of the <a class="wiki_link" href="/octatonic%20scale">octatonic scale</a>; however it is less regular and closer to just intonation. Star can be reached from various starting points, one of which is a 5-limit <a class="wiki_link" href="/Fokker%20blocks">Fokker block</a> which serves as a <a class="wiki_link" href="/transversal">transversal</a> for Star. The block in question is <a class="wiki_link" href="/smithgw_star">smithgw_star</a>, 25/24-6/5-5/4-36/25-3/2-5/3-9/5-2/1, which consists of a chain of minor thirds 5/3-1-6/5-36/25 and that chain translated by 5/4, and which has three major and three minor triads.<br /> | ||
<br /> | <br /> | ||
<!-- ws:start:WikiTextHeadingRule:4:&lt;h2&gt; --><h2 id="toc2"><a name="Star-Notes of | <!-- ws:start:WikiTextHeadingRule:4:&lt;h2&gt; --><h2 id="toc2"><a name="Star-Notes of Star"></a><!-- ws:end:WikiTextHeadingRule:4 -->Notes of Star</h2> | ||
By tempering out 126/125, leading to <a class="wiki_link" href="/Starling%20family#x7-limit starling">7-limit starling temperament</a> we add the 7-limit intervals 8/7, 7/6, 7/5 and their inversions to the mix, and by tempering by 385/384 also, leading to <a class="wiki_link" href="/Starling%20family#x7-limit starling-11-limit">11-limit starling</a>, the 11/8 interval also. There is no significant tuning advantage to 11-limit starling, a planar temperament, over the linear temperament <a class="wiki_link" href="/Starling%20temperaments#Valentine temperament-11-limit">valentine</a>, so we may consider | By tempering out 126/125, leading to <a class="wiki_link" href="/Starling%20family#x7-limit starling">7-limit starling temperament</a> we add the 7-limit intervals 8/7, 7/6, 7/5 and their inversions to the mix, and by tempering by 385/384 also, leading to <a class="wiki_link" href="/Starling%20family#x7-limit starling-11-limit">11-limit starling</a>, the 11/8 interval also. There is no significant tuning advantage to 11-limit starling, a planar temperament, over the linear temperament <a class="wiki_link" href="/Starling%20temperaments#Valentine temperament-11-limit">valentine</a>, so we may consider Star to be a scale of valentine. In valentine, with generator a tempered 21/20 of 78 cents, the notes of Star are -4, 0, 1, 4, 5, 8, 9 and 13 generators; in the ordering of the scale itself, that's 0, 1, 4, 5, 8, 9, -4, 13.<br /> | ||
<br /> | <br /> | ||
Since there are a finite number of 11-limit 8-note <a class="wiki_link" href="/lesfip%20scales">lesfip scales</a>, we may consider the <a class="wiki_link" href="/star-lesfip">lesfip version of | Since there are a finite number of 11-limit 8-note <a class="wiki_link" href="/lesfip%20scales">lesfip scales</a>, we may consider the <a class="wiki_link" href="/star-lesfip">lesfip version of Star</a>, star-lesfip, to be canonical. It can be reached from a variety of starting points. Lesfipping the 5-limit transversal in the range 14 to 17 cents of tolerance leads to star; so does lesfipping the 46et version in the range from 9 to 17 cents or the 77et version in the range 6 to 16 cents. Another tuning for Star, not very different, is <a class="wiki_link" href="/star">Star in 77et</a>; 77 giving the optimal patent val for both 11-limit starling and valentine.<br /> | ||
<br /> | <br /> | ||
<!-- ws:start:WikiTextHeadingRule:6:&lt;h2&gt; --><h2 id="toc3"><a name="Star-Chords of star"></a><!-- ws:end:WikiTextHeadingRule:6 -->Chords of star</h2> | <!-- ws:start:WikiTextHeadingRule:6:&lt;h2&gt; --><h2 id="toc3"><a name="Star-Chords of star"></a><!-- ws:end:WikiTextHeadingRule:6 -->Chords of star</h2> | ||
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<br /> | <br /> | ||
<!-- ws:start:WikiTextHeadingRule:8:&lt;h2&gt; --><h2 id="toc4"><a name="Star-Transformations"></a><!-- ws:end:WikiTextHeadingRule:8 -->Transformations</h2> | <!-- ws:start:WikiTextHeadingRule:8:&lt;h2&gt; --><h2 id="toc4"><a name="Star-Transformations"></a><!-- ws:end:WikiTextHeadingRule:8 -->Transformations</h2> | ||
Star has many permutations of its notes which send dyadic chords to other dyadic chords. We may use the standard <a class="wiki_link_ext" href="http://en.wikipedia.org/wiki/Cycle_notation" rel="nofollow">cycle notation</a> used with permutation groups to mean permutations of the pitch classes of | Star has many permutations of its notes which send dyadic chords to other dyadic chords. We may use the standard <a class="wiki_link_ext" href="http://en.wikipedia.org/wiki/Cycle_notation" rel="nofollow">cycle notation</a> used with permutation groups to mean permutations of the pitch classes of Star lifted to permutations of star as a periodic scale. For instance, the cycle (01) interchanges note 0 with note 1, which also means exchanging note 8 for note 9, and in general Star[n] with Star[n+1] whenever n is divisible by 8. The four involutions (elements of order two) (01), (23), (45) and (67) all preserve the dyadic harmony character of the chords of Star, while changing the actual chords. Together, they generate an <a class="wiki_link_ext" href="http://en.wikipedia.org/wiki/Elementary_abelian_group" rel="nofollow">elementary abelian 2-group</a> isomorphic to (Z/2Z)^4, which means fifteen nontrivial transformations. To these may be added involutions exchanging the adjacent even-odd pairs of the previous group, so that [0 2] for instance would mean, for n divisible by 8, Star[n] changes places with Star[n+2], and Star[n+1] with Star[n+3]. These involutions generate a group of infinite order, but on pitch classes we obtain a group of order 384. This is discussed from the point of view of graph theory <a class="wiki_link" href="/Graph-theoretic%20properties%20of%20scales#Examples-Star">here</a>.<br /> | ||
<br /> | |||
<!-- ws:start:WikiTextHeadingRule:10:&lt;h1&gt; --><h1 id="toc5"><a name="Nova"></a><!-- ws:end:WikiTextHeadingRule:10 -->Nova</h1> | |||
<!-- ws:start:WikiTextHeadingRule:12:&lt;h2&gt; --><h2 id="toc6"><a name="Nova-Nova transversal"></a><!-- ws:end:WikiTextHeadingRule:12 -->Nova transversal</h2> | |||
Star has a twin, Nova, with very similar characteristics but without 11-limit harmonies. It too can be reached from various starting points. One is a 5-limit <a class="wiki_link" href="/Fokker%20blocks">Fokker block</a> <a class="wiki_link" href="/transversal">transversal</a>, <a class="wiki_link" href="/smithgw_star2">smithgw_star2</a>, 27/25-6/5-5/4-36/25-3/2-5/3-9/5-2/1, which consists of a chain of minor thirds 5/3-1-6/5-36/25 and that chain translated by 3/2 rather than 5/4, and which also has three major and three minor triads.<br /> | |||
<br /> | |||
<!-- ws:start:WikiTextHeadingRule:14:&lt;h2&gt; --><h2 id="toc7"><a name="Nova-Notes of Nova"></a><!-- ws:end:WikiTextHeadingRule:14 -->Notes of Nova</h2> | |||
The transversal of Nova, when tempered by 126/125 (starling) temperament, leads to Nova. It can also be considered a scale of 7-limit valentine, for which both 77et and 185et will serve, the latter being the optimal patent val for both 7-limit starling and 7-limit valentine. In valentine, its notes in generator terms are -4, 0, 4, 5, 8, 9, 13 and 17, which in order of size are 0, 17, 4, 5, 8, 9, -4, 13.<br /> | |||
<br /> | <br /> | ||
< | The lesfip version of Nova, <a class="wiki_link" href="/nova-lesfip">nova-lesfip</a>, can be reached by lesfipping the transversal in the tolerance range 14 to 21 cents. It can also be reached from the 46et, 77et, or 185et tunings. The tolerance ranges are a little broader than those for Star since the lesfipping is done with respect to tbe 9-limit diamond; it also works from the 11-limit diamond, with narrower limits like those of Star, since then the 100/99 equivalencies must be avoided.</body></html></pre></div> | ||