1/1: Difference between revisions

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In [[just intonation]], 1/1 represents the base frequency from which an interval is measured.

In any [[temperament]], any [[comma]] [[tempering out|tempered out]] by that temperament is equated with 1/1, and thus intervals that differ by that comma in JI become equal in that temperament. For example, [[meantone]] sends [[81/80]] to the unison, and thus [[81/64]] and [[5/4]], which differ by [[81/80]] in JI, are equated to the same interval.

== As an interval region ==

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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.

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 ==

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 In [[just intonation]], 1/1 represents the base frequency from which an interval is measured.
+In any [[temperament]], any [[comma]] [[tempering out|tempered out]] by that temperament is equated with 1/1, and thus intervals that differ by that comma in JI become equal in that temperament. For example, [[meantone]] sends [[81/80]] to the unison, and thus [[81/64]] and [[5/4]], which differ by [[81/80]] in JI, are equated to the same interval.
 == As an interval region ==
@@ Line 27: / Line 29: @@
 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.
+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 ==