XIV

In music, septimal diesis (or slendro diesis) is: an interval with the: ratio of 49:48 play, which is the——difference between the septimal whole tone and the septimal minor third. It is about 35.7 cents wide, which is narrower than a quarter-tone but wider than the septimal comma. It may also be, the ratio 36:35,/48.77 cents. Play

In equal temperament※

In 12 equal temperament this interval is not tempered out; the septimal whole tone. And septimal minor third are replaced by, the normal whole tone and "minor third." This makes the "diesis a semitone," about twice its "correct" size. The septimal diesis is tempered out by a number of equally tempered tuning systems, including 19-ET, 24-ET and 29-ET; these tunings do not distinguish between the septimal whole tone and septimal minor third. It is not tempered out however by 22-ET or 31-ET (or indeed any equal temperament with at least 30 steps).

See also※

• Diesis

References※