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{{Infobox interval region | 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 [[millioctave]]s, [[EDO]] steps, 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. | |||
The unison may also be treated as an interval region with a width of 0 cents corresponding to exactly the interval 1/1. | |||
== Unison (interval region) == | |||
''[[:Category:Todo:complete section|Todo: Complete section.]]''{{Infobox interval region | |||
| Name=Unison | | Name=Unison | ||
| Cents lower=0 | | Cents lower=0 | ||
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| Lower region= | | Lower region= | ||
| Higher region=[[Comma and diesis]] | | Higher region=[[Comma and diesis]] | ||
}} | }}{{todo|complete section}}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 [[ | 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 [[Diatonic, chromatic, enharmonic, subchromatic|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]] | * [[Fundamental]] | ||
* [[Octave reduction]] | * [[Octave reduction]] | ||
[[Category:Unison| ]]<!-- main article --> | [[Category:Unison| ]]<!-- main article --> | ||
{{Wikipedia|Unison}} | {{Wikipedia|Unison}} | ||
[[Category:1-odd-limit]] | [[Category:1-odd-limit]] | ||