Octave (interval region): Difference between revisions

Revision as of 06:50, 29 July 2015

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<span style="display: block; text-align: right;">[[オクターブ|日本語]]
</span>
[[media type="file" key="jid_2_1_pluck_adu_dr220.mp3" width="240" height="20"]] [[file:xenharmonic/jid_2_1_pluck_adu_dr220.mp3|sound sample]]

The **octave** is one of the most basic [[Gallery of Just Intervals|intervals]] found in musical systems throughout the entire world. It is usually called the "interval of equivalence" because tones separated by an octave are perceived to have the same or similar pitch class to the average human listener. The reason for this phenomenon is probably due to the strong region of attraction of low [[harmonic entropy]], or the strong amplitude of the second [[harmonic]] in most harmonic instruments.

It has a frequency ratio of 2/1 and a size of 1200 [[cent|cents]]. It is used as the standard of (logarithmic) measurement for all intervals, regardless if they are justly tuned or not.

Strangely enough, the Pelog and Slendro scales of the Javanese contain near-octaves even though gamelan instruments exhibit inharmonic spectra. It is most likely reminiscent of an older musical system, or derived using the human voice instead of inharmonic instruments.

==Links== 
* [[http://www.kylegann.com/Octave.html|Anatomy of an Octave]] by [[Kyle Gann]]

==see also== 
* [[Prime Interval]]
* [[Gallery of Just Intervals]]
* [[Toctave]]
* [[EDO]]
* [[Ditave]] - an alternative more neutral name

Original HTML content:

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</span><br />
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<br />
The <strong>octave</strong> is one of the most basic <a class="wiki_link" href="/Gallery%20of%20Just%20Intervals">intervals</a> found in musical systems throughout the entire world. It is usually called the &quot;interval of equivalence&quot; because tones separated by an octave are perceived to have the same or similar pitch class to the average human listener. The reason for this phenomenon is probably due to the strong region of attraction of low <a class="wiki_link" href="/harmonic%20entropy">harmonic entropy</a>, or the strong amplitude of the second <a class="wiki_link" href="/harmonic">harmonic</a> in most harmonic instruments.<br />
<br />
It has a frequency ratio of 2/1 and a size of 1200 <a class="wiki_link" href="/cent">cents</a>. It is used as the standard of (logarithmic) measurement for all intervals, regardless if they are justly tuned or not.<br />
<br />
Strangely enough, the Pelog and Slendro scales of the Javanese contain near-octaves even though gamelan instruments exhibit inharmonic spectra. It is most likely reminiscent of an older musical system, or derived using the human voice instead of inharmonic instruments.<br />
<br />
<!-- ws:start:WikiTextHeadingRule:1:&lt;h2&gt; --><h2 id="toc0"><a name="x-Links"></a><!-- ws:end:WikiTextHeadingRule:1 -->Links</h2>
 <ul><li><a class="wiki_link_ext" href="http://www.kylegann.com/Octave.html" rel="nofollow">Anatomy of an Octave</a> by <a class="wiki_link" href="/Kyle%20Gann">Kyle Gann</a></li></ul><br />
<!-- ws:start:WikiTextHeadingRule:3:&lt;h2&gt; --><h2 id="toc1"><a name="x-see also"></a><!-- ws:end:WikiTextHeadingRule:3 -->see also</h2>
 <ul><li><a class="wiki_link" href="/Prime%20Interval">Prime Interval</a></li><li><a class="wiki_link" href="/Gallery%20of%20Just%20Intervals">Gallery of Just Intervals</a></li><li><a class="wiki_link" href="/Toctave">Toctave</a></li><li><a class="wiki_link" href="/EDO">EDO</a></li><li><a class="wiki_link" href="/Ditave">Ditave</a> - an alternative more neutral name</li></ul></body></html>

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 <h2>IMPORTED REVISION FROM WIKISPACES</h2>
 This is an imported revision from Wikispaces. The revision metadata is included below for reference:<br>
-: This revision was by author [[User:JlMoriart|JlMoriart]] and made on <tt>2014-07-01 19:12:05 UTC</tt>.<br>
+: This revision was by author [[User:hstraub|hstraub]] and made on <tt>2015-07-29 06:50:43 UTC</tt>.<br>
-: The original revision id was <tt>515385416</tt>.<br>
+: The original revision id was <tt>555894189</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>
 <h4>Original Wikitext 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;white-space: pre-wrap ! important" class="old-revision-html">[[media type="file" key="jid_2_1_pluck_adu_dr220.mp3" width="240" height="20"]] [[file:xenharmonic/jid_2_1_pluck_adu_dr220.mp3|sound sample]]
+<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">&lt;span style="display: block; text-align: right;"&gt;[[オクターブ|日本語]]
+&lt;/span&gt;
+[[media type="file" key="jid_2_1_pluck_adu_dr220.mp3" width="240" height="20"]] [[file:xenharmonic/jid_2_1_pluck_adu_dr220.mp3|sound sample]]
 The **octave** is one of the most basic [[Gallery of Just Intervals|intervals]] found in musical systems throughout the entire world. It is usually called the "interval of equivalence" because tones separated by an octave are perceived to have the same or similar pitch class to the average human listener. The reason for this phenomenon is probably due to the strong region of attraction of low [[harmonic entropy]], or the strong amplitude of the second [[harmonic]] in most harmonic instruments.
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 * [[Ditave]] - an alternative more neutral name</pre></div>
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 &lt;br /&gt;
 The &lt;strong&gt;octave&lt;/strong&gt; is one of the most basic &lt;a class="wiki_link" href="/Gallery%20of%20Just%20Intervals"&gt;intervals&lt;/a&gt; found in musical systems throughout the entire world. It is usually called the &amp;quot;interval of equivalence&amp;quot; because tones separated by an octave are perceived to have the same or similar pitch class to the average human listener. The reason for this phenomenon is probably due to the strong region of attraction of low &lt;a class="wiki_link" href="/harmonic%20entropy"&gt;harmonic entropy&lt;/a&gt;, or the strong amplitude of the second &lt;a class="wiki_link" href="/harmonic"&gt;harmonic&lt;/a&gt; in most harmonic instruments.&lt;br /&gt;

Octave (interval region): Difference between revisions

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