Pitch class
IMPORTED REVISION FROM WIKISPACES
This is an imported revision from Wikispaces. The revision metadata is included below for reference:
- This revision was by author genewardsmith and made on 2012-06-14 13:52:29 UTC.
- The original revision id was 345399078.
- The revision comment was:
The revision contents are below, presented both in the original Wikispaces Wikitext format, and in HTML exactly as Wikispaces rendered it.
Original Wikitext content:
A //pitch class// is a set (equivalence class) of all pitches that are a whole number of octaves apart, e.g., the pitch class C consists of the Cs in all octaves. Thus the pitch class "C" is the set
[[math]]
{C<sub>''n''</sub> : ''n'' is an [[integer]]} = {..., C<sub>-2</sub>, C<sub>-1</sub>, C<sub>0</sub>, C<sub>1</sub>, C<sub>2</sub>, C<sub>3</sub> ...}
[[math]]
In terms of frequencies expressed in hertz, assuming a base frequency for middle C of 262 Hz, this would be {... 65.5, 131, 262, 524, 1028 ...}. In terms of midi note numbers, we can write it as {... 36, 48, 60, 72, 84 ...}.
=Links=
The Wikipedia article on it is:
[[http://en.wikipedia.org/wiki/Pitch_class|Pitch class]] Original HTML content:
<html><head><title>Pitch class</title></head><body>A <em>pitch class</em> is a set (equivalence class) of all pitches that are a whole number of octaves apart, e.g., the pitch class C consists of the Cs in all octaves. Thus the pitch class "C" is the set<br />
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<!-- ws:start:WikiTextMathRule:0:
[[math]]<br/>
{C<sub>''n''</sub> : ''n'' is an [[integer]]} = {..., C<sub>-2</sub>, C<sub>-1</sub>, C<sub>0</sub>, C<sub>1</sub>, C<sub>2</sub>, C<sub>3</sub> ...}<br/>[[math]]
--><script type="math/tex">{C<sub>''n''</sub> : ''n'' is an [[integer]]} = {..., C<sub>-2</sub>, C<sub>-1</sub>, C<sub>0</sub>, C<sub>1</sub>, C<sub>2</sub>, C<sub>3</sub> ...}</script><!-- ws:end:WikiTextMathRule:0 --><br />
<br />
In terms of frequencies expressed in hertz, assuming a base frequency for middle C of 262 Hz, this would be {... 65.5, 131, 262, 524, 1028 ...}. In terms of midi note numbers, we can write it as {... 36, 48, 60, 72, 84 ...}.<br />
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<!-- ws:start:WikiTextHeadingRule:1:<h1> --><h1 id="toc0"><a name="Links"></a><!-- ws:end:WikiTextHeadingRule:1 -->Links</h1>
The Wikipedia article on it is:<br />
<br />
<a class="wiki_link_ext" href="http://en.wikipedia.org/wiki/Pitch_class" rel="nofollow">Pitch class</a></body></html>