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{{Infobox Interval | |||
| Name = (perfect) unison, (perfect) prime, 1st harmonic, 1st subharmonic, fundamental | |||
| Color name = w1, wa unison | |||
}} | |||
The '''unison''' (interval ratio '''1/1''') is the [[interval]] between two tones that are identical in pitch. In the [[harmonic series]], 1/1 is the 1st [[harmonic]], and likewise in the [[subharmonic series]] 1/1 is the first [[subharmonic]] – this is because it acts as the fundamental to both series. | |||
Measured in [[cent]]s (or any other logarithmic measure such as [[2/1|octave]]s, [[edo|edosteps]], etc.), the unison's size is exactly 0. This is because the distance between two identical pitches is zero. As such, the unison can be considered as a degenerate interval. | |||
In [[just intonation]], 1/1 represents the base frequency from which an interval is measured. | |||
== As an interval region == | |||
{{Todo|complete section}} | |||
{{Infobox interval region | |||
| Name = Unison | |||
| Cents lower = 0 | |||
| Cents upper = 0 | |||
| Cents upper wide = 6 | |||
| JI intervals = 1/1 | |||
| Complement = [[Octave]] | |||
| Lower region = | |||
| Higher region = [[Comma and diesis]] | |||
}} | |||
{{Wikipedia|Unison}} | |||
As an interval region, the unison usually refers precisely to the 0-cent interval. However, there can be a tiny difference between any two intervals that are practically "the same note" (more pedantically, an extremely small [[Unnoticeable comma|comma]]), that might be considered a "unison" (or at least too small to be a meaningful interval). This range usually goes up to 3.5 cents, as that is the just-noticeable difference. | |||
In some practices, this bound goes up to about 6 cents, which is the most precisely one is expected to intonate a pitch on certain instruments, and is a bit smaller than a [[Kleisma (interval region)|kleisma]] (hence the kleisma's significance in the context of intonation). | |||
As a diatonic interval category, unisons represent [[subchromatic]] motions – i.e. the difference between a note and itself (though perhaps in a different tuning or using a non-diatonic accidental, though that's more generally covered by [[comma and diesis]]). Every note in every scale has a unison, which is that note itself. | |||
In functional harmony, the unison over the root serves as the [[tonic]]. | |||
== See also == | == See also == | ||
* [[Fundamental]] | |||
* [[ | |||
* [[Octave reduction]] | * [[Octave reduction]] | ||
[[Category:Unison| ]] <!-- main article --> | [[Category:Unison| ]]<!-- main article --> | ||
[[Category: | [[Category:1-odd-limit]] | ||