Interval of equivalence: Difference between revisions
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* In [[Bohlen–Pierce]], the equave may be taken as [[3/1]]. | * In [[Bohlen–Pierce]], the equave may be taken as [[3/1]]. | ||
* In [[edf]]s, the equave may be taken as [[3/2]] or less commonly [[9/4]]. | * In [[edf]]s, the equave may be taken as [[3/2]] or less commonly [[9/4]]. | ||
== See also == | == See also == | ||
Revision as of 20:59, 24 April 2025
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.
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.
See also
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.