Diminished octave
Appearance
Inverse | Augmented unison |
---|---|
Name | |
Other names | Diminished eighth |
Abbreviation | d8[1] |
Size | |
Semitones | 11 |
Interval class | 1 |
Just interval | 48:25, 256:135,[2] 4096:2187 |
Cents | |
12-Tone equal temperament | 1100[2] |
Just intonation | 1129, 1108,[2] 1086 |
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Diminished_octave_on_C.png/220px-Diminished_octave_on_C.png)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/37/Diminished_octave_on_C-sharp.png/220px-Diminished_octave_on_C-sharp.png)
In music from Western culture, a diminished octave ( ) is an interval produced by narrowing a perfect octave by a chromatic semitone.[1] As such, the two notes are denoted by the same letter but have different accidentals. For instance, the interval from C4 to C5 is a perfect octave, twelve semitones wide, and both the intervals from C♯4 to C5 and from C4 to C♭5 are diminished octaves, spanning eleven semitones. Being diminished, it is considered a dissonant interval.[3]
The diminished octave is enharmonically equivalent to the major seventh.
References
[edit]- ^ a b Benward & Saker (2003). Music: In Theory and Practice, Vol. I, p.54. ISBN 978-0-07-294262-0. Specific example of an d8 not given but general example of perfect intervals described.
- ^ a b c Duffin, Ross W. (2008). How equal temperament ruined harmony : (and why you should care) (First published as a Norton paperback. ed.). New York: W. W. Norton. p. 163. ISBN 978-0-393-33420-3. Retrieved 28 June 2017.
- ^ Benward & Saker (2003), p.92.