Interval of equivalence: Difference between revisions
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manual undo of earlier section about "tempering equave" which is not really how we use that term |
→See also: octave equivalence |
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== See also == | == See also == | ||
* [[Period]] | * [[Period]] | ||
* [[Octave equivalence]] | |||
* [[Stretched tuning]] | * [[Stretched tuning]] | ||
* [[Equave limit]] | * [[Equave limit]] | ||
Revision as of 21:02, 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.