Septimal diesis

Septimal diesis

In music, septimal diesis (or slendro diesis) is an interval with the ratio of 49:48 Audio|Septimal diesis on C.mid|play, which is the difference between the septimal whole tone and the septimal minor third. It is about 38.71 cents wide, which is narrower than a quarter-tone but wider than the septimal comma.

In equal temperament

The septimal diesis is tempered out by a number of equally-tempered tuning systems, including 19-ET and 24-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.

References

* Jan Haluska, "The Mathematical Theory of Tone Systems", CRC (2003), (ISBN 0824747143)


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