Definitions of tuning terms

© 1998 by Joseph L. Monzo

All definitions by Joe Monzo unless otherwise cited


finity


    Although the lattice structure, representing rational musical pitch relationships thru the implemenatation of prime- or odd- factorization, is theoretically unbounded and infinite, there are finite boundaries of the lattice which designate the limits of our perceptual abilities to differentiate between prime- or odd-affect, sonance, and "octave"-equivalence. All ratios within these boundaries can be clearly, if not precisely, differentiated.

    Because my lattices are based on the premise of monophony, with rational complexity directly proportional to exponential distance from the central n0, all ratios outside the finite boundaries cannot be clearly differentiated from the simpler ones within.

    These boundaries also designate the limits of interval size of categorical interval perception. They have yet to be conclusively determined, in part because of the effects of bridging.

    [Paul Erlich has done important work in this area - see his Tuning Digest postings on harmonic entropy]

    The important point about finity is that, while frequency vibrations may affect us in specific ways, if these affects cannot be perceived audibly, then they do not play a part in musical analysis, and therefore we recognize limits to enharmonicity.

    Finity has been recognized mostly by theorists and composers who have grappled with the realization that the universe of possible pitches and intervals is infinite, with the struggle to implement on a playable instrument some subset of this universe to allow musical performance, composition, and experimentation, and with arguing some kind of logically-reasoned basis for choosing their particular subset. Among them are Riemann, Schoenberg, Partch, and indeed any advocate of some particular tuning.

    In the 1960s Fokker characterized the finite systems, which could be emulated at other parts of the lattice by different prime-factors, as periodicity blocks.

    [from Joe Monzo, JustMusic: A New Harmony]


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