Definitions of tuning terms
© 1998 by Joseph L. Monzo
All definitions by Joe Monzo unless otherwise cited
unison vector
A term used by Fokker to describe what I call
a xenharmonic bridge: an interval which
is small enough that it can be disregarded, thereby enabling a
ratio with one set of
prime-factors
to substitute for a ratio with a different set of factors.
The most frequently-used one by Fokker was the
225/224 variety of the septimal schisma,
allowing 7/4 and 225/128
to be perceived as being interchangeable with each other.
In Fokker's lattice theory,
the spanning of lattice regions by these unison vectors
would demarcate a boundary of a
periodicity block.
[Paul Erlich comments:
[from Joe Monzo, JustMusic: A New Harmony]
That language is a little strange -- I'd simply say, the unison vectors
divide the lattice into regions called periodicity blocks.]
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