Chroma: Difference between revisions

From Xenharmonic Wiki
Jump to navigation Jump to search
VisualWikitext
Wikispaces>JlMoriart
**Imported revision 573444861 - Original comment: **
 
Sintel (talk | contribs)
autopatrolled, emailconfirmed
1,632 edits
m spacing
 
(18 intermediate revisions by 10 users not shown)
Line 1: Line 1:
<h2>IMPORTED REVISION FROM WIKISPACES</h2>
{{About|chromas in general|the chroma in the diatonic scale|Chromatic semitone}}
This is an imported revision from Wikispaces. The revision metadata is included below for reference:<br>
__NOTOC__ <!-- No TOC because it's a rather short article. Remove this if it has expanded significantly. -->
: This revision was by author [[User:JlMoriart|JlMoriart]] and made on <tt>2016-01-30 15:26:23 UTC</tt>.<br>
The '''chroma''' (precisely the '''moschroma''') of a [[mos scale]] is the interval that is the difference between the large step and the small step in the scale. In particular, the chroma in the [[diatonic]] scale is the [[chromatic semitone]], or augmented unison, such as the interval of C&ndash;C♯.  
: The original revision id was <tt>573444861</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">--THIS PAGE IS A WORK IN PROGRESS--


Given an MOS scale, the Chroma for that scale is the interval that is the difference between the large step and the small step in the scale.
In staff notation, alteration by the chroma can be represented by the sharp (♯) or flat (♭), as is shown above. In [[diamond-mos notation]], it should be noted that they are reserved exclusively for the diatonic scale, whereas am (&) and at (@) are used for other mos scales.  


For example, in the diatonic scale the large step is the major second (C-D) and the small step is the minor second (C-Db). The difference between those two intervals is the augmented unison (C-C#).
Moving one note in a mos scale by a chroma leads to a [[modmos scale]] if the result is not just a transposition of the original mos scale.


The term was suggested as a way to generalize the concept of a sharp or flat (# or b).
The [[Fokker block]], being a generalization of the mos scale to higher ranks, also has the concept of chroma. See [[Fokker block]].


Moving one note in an MOS scale by a chroma leads to a MODMOS (if the result is not just a transposition of the original MOS scale.)</pre></div>
== History ==
<h4>Original HTML content:</h4>
The first mention of the term "chroma" occurs in Marchettus of Padua<ref>Marchettus of Padua (1318) ''Lucidarium''.</ref> where he describes it as an interval smaller than the diatonic semitone. The exact nature of the interval he was describing is debated.<ref>Joe Monzo (2008) ''Speculations on Marchetto of Padua's "Fifth-Tones"''. http://www.tonalsoft.com/monzo/marchetto/marchetto.aspx</ref>
<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;Chroma&lt;/title&gt;&lt;/head&gt;&lt;body&gt;--THIS PAGE IS A WORK IN PROGRESS--&lt;br /&gt;
 
&lt;br /&gt;
== In psychoacoustics ==
Given an MOS scale, the Chroma for that scale is the interval that is the difference between the large step and the small step in the scale.&lt;br /&gt;
{{wikipedia|Chroma feature}}
&lt;br /&gt;
In psychoacoustics, the term ''chroma'' refers to the circular perception of pitch with respect to [[octave equivalence]].
For example, in the diatonic scale the large step is the major second (C-D) and the small step is the minor second (C-Db). The difference between those two intervals is the augmented unison (C-C#).&lt;br /&gt;
This is essentially the same as the concept of [[pitch class]].
&lt;br /&gt;
 
The term was suggested as a way to generalize the concept of a sharp or flat (# or b).&lt;br /&gt;
== See also ==
&lt;br /&gt;
* [[Pythagorean chroma]]
Moving one note in an MOS scale by a chroma leads to a MODMOS (if the result is not just a transposition of the original MOS scale.)&lt;/body&gt;&lt;/html&gt;</pre></div>
* [[Chromatic semitone]]
* [[25/24]], the 5-limit chromatic semitone
* [[Sharpness]], a property related to sharps and flats in [[edo]]s
* [[Diesis (scale theory)]]
 
== References ==
<references/>
 
[[Category:Chroma| ]] <!-- main article -->
[[Category:MOS scale]]
[[Category:MODMOS]]
[[Category:Terms]]

Latest revision as of 18:23, 30 April 2025

This page is about chromas in general. For the chroma in the diatonic scale, see Chromatic semitone.

The chroma (precisely the moschroma) of a mos scale is the interval that is the difference between the large step and the small step in the scale. In particular, the chroma in the diatonic scale is the chromatic semitone, or augmented unison, such as the interval of C–C♯.

In staff notation, alteration by the chroma can be represented by the sharp (♯) or flat (♭), as is shown above. In diamond-mos notation, it should be noted that they are reserved exclusively for the diatonic scale, whereas am (&) and at (@) are used for other mos scales.

Moving one note in a mos scale by a chroma leads to a modmos scale if the result is not just a transposition of the original mos scale.

The Fokker block, being a generalization of the mos scale to higher ranks, also has the concept of chroma. See Fokker block.

History

The first mention of the term "chroma" occurs in Marchettus of Padua[1] where he describes it as an interval smaller than the diatonic semitone. The exact nature of the interval he was describing is debated.[2]

In psychoacoustics

English Wikipedia has an article on:

In psychoacoustics, the term chroma refers to the circular perception of pitch with respect to octave equivalence. This is essentially the same as the concept of pitch class.

See also

References

  1. ↑ Marchettus of Padua (1318) Lucidarium.
  2. ↑ Joe Monzo (2008) Speculations on Marchetto of Padua's "Fifth-Tones". http://www.tonalsoft.com/monzo/marchetto/marchetto.aspx
Retrieved from "https://en.xen.wiki/index.php?title=Chroma&oldid=194822"