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Interval information
Ratio 128/121
Monzo [7 0 0 0 -2
Size in cents 97.36412
Name(s) Alpharabian diatonic semitone,
octave-reduced 121st subharmonic
FJS name M2121

[sound info]

128/121, the Alpharabian diatonic semitone, or octave-reduced 121st subharmonic, is an 11-limit semitone with a value of roughly 97.4 cents. As the name "Alpharabian diatonic semitone" suggests, it acts as the diatonic counterpart to the 1089/1024, with the two intervals adding up to a 9/8 whole tone. Furthermore its status as a diatonic semitone can be verified by the fact that just as a diatonic semitone and a chromatic semitone add up to make a whole tone, a similar pairing of quartertones- namely 4096/3993 and 33/32- add up to 128/121.

See also