16/15: Difference between revisions

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<h2>IMPORTED REVISION FROM WIKISPACES</h2>
{{Infobox Interval
This is an imported revision from Wikispaces. The revision metadata is included below for reference:<br>
| Name = just diatonic semitone, classic(al) diatonic semitone, ptolemaic diatonic semitone
: This revision was by author [[User:Sarzadoce|Sarzadoce]] and made on <tt>2011-08-09 15:15:47 UTC</tt>.<br>
| Comma = yes
: The original revision id was <tt>245079681</tt>.<br>
| Color name = g2, gu 2nd
: The revision comment was: <tt></tt><br>
| Sound = jid_16_15_pluck_adu_dr220.mp3
The revision contents are below, presented both in the original Wikispaces Wikitext format, and in HTML exactly as Wikispaces rendered it.<br>
}}
<h4>Original Wikitext content:</h4>
{{Wikipedia|Semitone}}
<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;white-space: pre-wrap ! important" class="old-revision-html">The just diatonic semitone is the 5-limit [[superparticular]] interval 16/15, the difference between the major third 5/4 and the fourth 4/3, and between [[3_2|3/2]] and 8/5.
The [[5-limit]] [[superparticular]] interval '''16/15''' is the '''just diatonic semitone''', '''classic(al) diatonic semitone''' or '''ptolemaic diatonic semitone'''<ref>For reference, see [[5-limit]]. </ref>.


When this ratio is taken as a comma to be tempered, it produces Father temperament where 4/3 and 5/4 are equated. It is a notable temperament because major thirds and fifths become octave-inverses of each other.</pre></div>
It is the difference between:
<h4>Original HTML content:</h4>
* the major second [[9/8]] and the minor third [[6/5]];
<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">&lt;html&gt;&lt;head&gt;&lt;title&gt;16_15&lt;/title&gt;&lt;/head&gt;&lt;body&gt;The just diatonic semitone is the 5-limit &lt;a class="wiki_link" href="/superparticular"&gt;superparticular&lt;/a&gt; interval 16/15, the difference between the major third 5/4 and the fourth 4/3, and between &lt;a class="wiki_link" href="/3_2"&gt;3/2&lt;/a&gt; and 8/5.&lt;br /&gt;
* the major third [[5/4]] and the fourth [[4/3]];
&lt;br /&gt;
* the perfect fifth [[3/2]] and the minor sixth [[8/5]];
When this ratio is taken as a comma to be tempered, it produces Father temperament where 4/3 and 5/4 are equated. It is a notable temperament because major thirds and fifths become octave-inverses of each other.&lt;/body&gt;&lt;/html&gt;</pre></div>
* the major sixth [[5/3]] and the minor seventh [[16/9]];
* the major seventh [[15/8]] and the perfect octave [[2/1]].
 
== Approximation ==
16/15 is very accurately approximated by [[43edo]] (4\43).
 
== Temperaments ==
When this ratio is taken as a [[comma]] to be [[tempering out|tempered out]], it produces [[father]] temperament, and lends itself the name '''father comma'''. In this [[exotemperament]], 4/3 and 5/4 are equated, and major thirds and fifths become [[octave complement]]s of each other. It is a [[Mersenne comma]].
 
The following [[linear temperament]]s are [[generate]]d by a [[~]]16/15:
* [[Vavoom]]
* [[Stockhausenic]]
 
In addition, this [[fractional-octave temperaments]] are generated by a ~16/15:
* [[Quintosec]]
{{todo|complete list}}
 
Some [[11th-octave temperaments]] treat ~16/15 as the period, including [[hendecatonic]].
 
== See also ==
* [[15/8]] – its [[octave complement]]
* [[45/32]] – its [[fifth complement]]
* [[5/4]] – its [[fourth complement]]
* [[256/243]] – the Pythagorean (3-limit) diatonic semitone
* [[Gallery of just intervals]]
* [[List of superparticular intervals]]
 
== Notes ==
<references/>
 
[[Category:Second]]
[[Category:Semitone]]
[[Category:Father]]
[[Category:Commas named after their interval size]]

Latest revision as of 02:03, 6 August 2025

Interval information
Ratio 16/15
Factorization 24 × 3-1 × 5-1
Monzo [4 -1 -1⟩
Size in cents 111.7313¢
Names just diatonic semitone,
classic(al) diatonic semitone,
ptolemaic diatonic semitone
Color name g2, gu 2nd
FJS name [math]\displaystyle{ \text{m2}_{5} }[/math]
Special properties square superparticular,
reduced,
reduced subharmonic
Tenney height (log2 nd) 7.90689
Weil height (log2 max(n, d)) 8
Wilson height (sopfr(nd)) 16
Comma size large
S-expressions S4,
S6 × S7 × S8

[sound info]
Open this interval in xen-calc
English Wikipedia has an article on:

The 5-limit superparticular interval 16/15 is the just diatonic semitone, classic(al) diatonic semitone or ptolemaic diatonic semitone[1].

It is the difference between:

  • the major second 9/8 and the minor third 6/5;
  • the major third 5/4 and the fourth 4/3;
  • the perfect fifth 3/2 and the minor sixth 8/5;
  • the major sixth 5/3 and the minor seventh 16/9;
  • the major seventh 15/8 and the perfect octave 2/1.

Approximation

16/15 is very accurately approximated by 43edo (4\43).

Temperaments

When this ratio is taken as a comma to be tempered out, it produces father temperament, and lends itself the name father comma. In this exotemperament, 4/3 and 5/4 are equated, and major thirds and fifths become octave complements of each other. It is a Mersenne comma.

The following linear temperaments are generated by a ~16/15:

In addition, this fractional-octave temperaments are generated by a ~16/15:

Some 11th-octave temperaments treat ~16/15 as the period, including hendecatonic.

See also

Notes

  1. ↑ For reference, see 5-limit.
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