Chromatic semitone
Jump to navigation
Jump to search
English Wikipedia has an article on:
A chromatic semitone or augmented unison is the chroma of a diatonic scale. It is also the large step of a p-chromatic scale or the small step of an m-chromatic scale.
In just intonation, an interval may be classified as a chromatic semitone if it is reasonably mapped to 0\7 and 2\24 (precisely zero steps of the diatonic scale and one step of the chromatic scale). The use of 24edo's 2\24 as the mapping criteria here rather than 12edo's 1\12 better captures the characteristics of many intervals in the 11- and 13-limit.
Examples
- 2187/2048, the Pythagorean chromatic semitone (3-limit)
- 25/24, the classic chromatic semitone (5-limit)
- 1089/1024, the Alpharabian chromatic semitone (11-limit, specifically 2.3.11 subgroup)