Interval of equivalence

In a periodic scale, the equave (/ˈiːkwɪv/ EE-kwiv or /ˈiːkwəv/ EE-kwəv), also called interval of equivalence, equivalence interval, formal octave or pseudo-octave, is the interval such that pitches separated by it are considered equivalent and are elements of the same pitch class.

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Pseudo-octave

The equave of a scale is generally the same as its period or a multiple of its period.

Etymology

The term equave was coined by Inthar. It is a portmanteau of equivalence and octave.

Examples

• In octave-equivalent scales, the equave is 2/1.
• In Bohlen-Pierce, the equave is 3/1.
• In edfs, the equave is 3/2.

See also

• Period
• Stretched tuning