Diaphonic cycle
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A diaphonic cycle is a type of scale described by Erv Wilson which joins two harmonic or subharmonic series segments together at a junction or disjunction, and then repeats.
For example, one of the subharmonic genus, using a junction:
| scale step | 1 | 2 | 3 | 4 | 5 | 6 | 7 (Junction) | 8 | 9 | 10 | 11 | 12 | (1) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| upper section (subharmonics 21 - 15, rebased onto 20/14 = 10/7) |
21/21 | 21/20 | 21/19 | 21/18 | 21/17 | 21/16 | (21/15) | ||||||
| lower section (subharmonics 20 - 14) |
20/20 | 20/19 | 20/18 | 20/17 | 20/16 | 20/15 | 20/14 | ||||||
| combined scale (using LCM) |
60/60 | 60/57 | 60/54 | 60/51 | 60/48 | 60/45 | 60/42 | 60/40 | 60/38 | 60/36 | 60/34 | 60/32 | (60/30) |
| combined scale (reduced to lowest terms) |
1/1 | 20/19 | 10/9 | 20/17 | 5/4 | 4/3 | 10/7 | 3/2 | 30/19 | 5/3 | 30/17 | 15/8 | (2/1) |