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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 ==

{{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]]

}}

In [[~~just Intonation~~]], ~~'''1/1'''~~ (~~also called the '''unison'''~~ or ~~'''perfect prime'''~~) ~~represents~~ the ~~base frequency from~~ which an interval ~~is measured~~. As a ~~frequency ratio~~, ~~it is simply 1. Measured in~~ [[~~cent~~]]s (or ~~any other logarithmic measure such as millioctaves~~, [[~~EDO~~]] ~~steps~~, ~~etc~~.~~) it is exactly zero~~.

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 ==

* [[Fundamental]]

* [[~~Octave~~]]

* [[Octave reduction]]

[[Category:Unison| ]]

[[Category:Unison| ]]

[[Category:~~Interval ratio]]~~

[[Category:1-odd-limit]]

~~[[Category:Just interval]]~~

~~[[Category:2~~-limit]]

~~[[Category:Todo:expand]] ~~

@@ Line 1: / Line 1: @@
+{{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&nbsp;and&nbsp;diesis]]
+}}
 {{Wikipedia|Unison}}
-In [[just Intonation]], '''1/1''' (also called the '''unison''' or '''perfect prime''') represents the base frequency from which an interval is measured. As a frequency ratio, it is simply 1. Measured in [[cent]]s (or any other logarithmic measure such as millioctaves, [[EDO]] steps, etc.) it is exactly zero.
+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 ==
+* [[Fundamental]]
-* [[Octave]]
 * [[Octave reduction]]
-[[Category:Unison| ]] <!-- main article -->
+[[Category:Unison| ]]<!-- main article -->
-[[Category:Interval ratio]]
+[[Category:1-odd-limit]]
-[[Category:Just interval]]
-[[Category:2-limit]]
-[[Category:Todo:expand]] <!-- add informations about interval region -->