Interval of equivalence

The equave (/ˈiːkwɪv/ EE-kwiv or /ˈiːkwəv/ EE-kwəv), also called interval of equivalence, equivalence interval, formal octave^[1]^{[note 1]}or pseudo-octave^[2]^{[note 1]}, is the interval such that pitches separated by it are considered psychoacoustically or formally equivalent and are elements of the same pitch class.

English Wikipedia has an article on:

Pseudo-octave

If a periodic scale has an equave, the equave is typically the same as the period or a multiple thereof.

Etymology

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

Examples

In octave-repeating scales, the equave is typically 2/1.
In Bohlen–Pierce, the equave may be taken as 3/1.
In edfs, the equave may be taken as 3/2 or less commonly 9/4.

Notes

↑ ^1.0 ^1.1 The terms formal octave and pseudo-octave are often used specifically to designate a stretched or compressed octave, but they may more generally designate any kind of equave.

References

↑ Op de Coul, E.F. Scala help.
↑ ASCL Specification. Ableton.

[:0-2] 1.0 ^1.1 The terms formal octave and pseudo-octave are often used specifically to designate a stretched or compressed octave, but they may more generally designate any kind of equave.

[1] Op de Coul, E.F. Scala help.

[3] ASCL Specification. Ableton.

[1]

[note 1]

[2]

Interval of equivalence

Contents

Etymology

Examples

See also

Notes

References