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Interval region: Difference between revisions

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It is well-known that there are infinite possible intervals, even if one confines one's view to a single octave. This includes the rational intervals of [[just intonation]] and the irrational intervals of [[EDO]]s, [[edonoi]]s, and other systems. However, it is helpful to consider '''interval regions''' (or '''interval categories'''), which there may be a finite number to consider.
There are infinite possible intervals (both tempered and just), even within a single [[2/1|octave]]. It can be helpful to group these intervals into a finite number of '''interval regions''' or '''interval categories'''.
 
== Concrete regions vs abstract categories ==
An ''interval region'' usually implies it is concrete, defined by concrete boundaries of interval sizes. The boundaries are usually fuzzy to allow some vagueness, in line with how we perceive them. Which region an interval falls into solely depends on the interval's size.
 
An ''interval category'' is usually meant to be abstract. It uses some [[mapping]] to determine which category an interval falls into, short-circuiting the question of where exactly to place the boundaries. It also takes account of an interval's [[prime factorization|prime components]], allowing us to find a composite interval's category through [[interval arithmetic]].
 
The [[5L 2s|diatonic]] interval category system commonly used to categorize JI intervals consists of a [[interval quality|quality]] and a diatonic scale degree.  


== Extended-diatonic interval names ==
== Extended-diatonic interval names ==
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|-
|-
! | Interval Category
! | Interval Category
! | Associated Ranges of Cents Values (borders are "fuzzy")
! | Approx. Cents Ranges
! colspan="2" |sub-category
|-
|-
| | [[Unison|Pure Unison]] (1:1)
| | [[Unison|Pure Unison]] (1:1)
| | 0
| | 0
|
|
|-
|-
| | [[Comma]]s
| | [[Comma]]s
| | 0-30
| | 0-30
|
|
|-
|-
| | [[Diesis|Dieses]]
| | [[Diesis|Dieses]]
| | 30-60
| | 30-60
|
|
|-
|-
| | [[Minor second|Minor Second]]s
| rowspan="3"| [[Minor second|Minor Second]]s
| | 60-125
| rowspan="3"| 60-125
|-
|small
| | *small
|60-80
| | 60-80
|-
| | *middle
| | 80-100
|-
|-
| | *large
|middle
| | 100-125
|80-100
|-
|-
| | [[Neutral second|Neutral Second]]s
|large
| | 125-170
|100-125
|-
|-
| | *small
| rowspan="3"|[[Neutral second|Neutral Second]]s
| | 125-135
|  rowspan="3"| 125-170
|small
|125-135
|-
|-
| | *middle
|middle
| | 135-160
|135-160
|-
|-
| | *large
|large
| | 160-170
|160-170
|-
|-
| | [[Equable heptatonic|Equable Heptatonic]]
| |[[Equable heptatonic|Equable Heptatonic]]
| | 160-182
| | 160-182
|
|
|-
|-
| | [[Major second|Major Second]]s
| rowspan="3"|[[Major second|Major Second]]s
| | 180-240
| rowspan="3"| 180-240
|small
|180-200
|-
|-
| | *small
|middle
| | 180-200
|200-220
|-
|-
| | *middle
|large
| | 200-220
|220-240
|-
|-
| | *large
| |[[Interseptimal interval|Interseptimal]] (Maj2-min3)
| | 220-240
|-
| | [[Interseptimal interval|Interseptimal]] (Maj2-min3)
| | 240-260
| | 240-260
|
|
|-
|-
| | [[Minor third|Minor Third]]s
| rowspan="3"|[[Minor third|Minor Third]]s
| | 260-330
| rowspan="3"| 260-330
|small
|260-280
|-
|-
| | *small
|middle
| | 260-280
|280-300
|-
|-
| | *middle
|large
| | 280-300
|300-330
|-
|-
| | *large
| rowspan="3"| [[Neutral third|Neutral Third]]s
| | 300-330
| rowspan="3"| 330-372
|small
|330-342
|-
|-
| | [[Neutral third|Neutral Third]]s
|middle
| | 330-372
|342-360
|-
|-
| | *small
|large
| | 330-342
|360-372
|-
|-
| | *middle
| rowspan="3"|[[Major third|Major Third]]s
| | 342-360
|  rowspan="3"| 372-440
|small
|372-400
|-
|-
| | *large
|middle
| | 360-372
|400-423
|-
|-
| | [[Major third|Major Third]]s
|large
| | 372-440
|423-440
|-
|-
| | *small
| |[[Interseptimal interval|Interseptimal]] (Maj3-4)
| | 372-400
|-
| | *middle
| | 400-423
|-
| | *large
| | 423-440
|-
| | [[Interseptimal interval|Interseptimal]] (Maj3-4)
| | 440-468
| | 440-468
|
|
|-
|-
| | [[Perfect fourth|Perfect Fourth]]s
| rowspan="3"|[[Perfect fourth|Perfect Fourth]]s
| | 468-528
| rowspan="3"| 468-528
|small
|468-491
|-
|-
| | *small
|middle
| | 468-491
|491-505
|-
|-
| | *middle
|large
| | 491-505
|505-528
|-
|-
| | *large
| |[[Superfourth]]s
| | 505-528
|-
| | [[Superfourth]]s
| | 528-560
| | 528-560
|
|
|-
|-
| | [[Tritone|Tritonic Region]]
| rowspan="3"|[[Tritone|Tritonic Region]]
| | 560-640
| rowspan="3"| 560-640
|small
|560-577
|-
|-
| | *small
|middle
| | 560-577
|577-623
|-
|-
| | *middle
|large
| | 577-623
|623-640
|-
|-
| | *large
| |[[Subfifth]]s
| | 623-640
|-
| | [[Subfifth]]s
| | 640-672
| | 640-672
|
|
|-
|-
| | [[Perfect fifth|Perfect Fifth]]s
| rowspan="3"|[[Perfect fifth|Perfect Fifth]]s
| | 672-732
| rowspan="3"| 672-732
|small
|672-695
|-
|-
| | *small
|middle
| | 672-695
|695-709
|-
|-
| | *middle
|large
| | 695-709
|709-732
|-
| | *large
| | 709-732
|-
|-
| | [[Interseptimal interval|Interseptimal]] (5-min6)
| | [[Interseptimal interval|Interseptimal]] (5-min6)
| | 732-760
| | 732-760
|
|
|-
|-
| | [[Minor sixth|Minor Sixth]]s
| rowspan="3"|[[Minor sixth|Minor Sixth]]s
| | 760-828
| rowspan="3"| 760-828
|small
|760-777
|-
|-
| | *small
|middle
| | 760-777
|777-800
|-
|-
| | *middle
|large
| | 777-800
|800-828
|-
|-
| | *large
| rowspan="3"|[[Neutral sixth|Neutral Sixth]]s
| | 800-828
| rowspan="3"| 828-870
|small
|828-840
|-
|-
| | [[Neutral sixth|Neutral Sixth]]s
|middle
| | 828-870
|840-858
|-
|-
| | *small
|large
| | 828-840
|858-870
|-
|-
| | *middle
| rowspan="3"|[[Major sixth|Major Sixth]]s
| | 840-858
|  rowspan="3"| 870-940
|small
|870-900
|-
|-
| | *large
|middle
| | 858-870
|900-920
|-
|-
| | [[Major sixth|Major Sixth]]s
|large
| | 870-940
|920-940
|-
| | *small
| | 870-900
|-
| | *middle
| | 900-920
|-
| | *large
| | 920-940
|-
|-
| | [[Interseptimal interval|Interseptimal]] (Maj6-min7)
| | [[Interseptimal interval|Interseptimal]] (Maj6-min7)
| | 940-960
| | 940-960
|
|
|-
|-
| | [[Minor seventh|Minor Seventh]]s
| rowspan="3"|[[Minor seventh|Minor Seventh]]s
| | 960-1025
| rowspan="3"| 960-1025
|-
|small
| | *small
|960-987
| | 960-987
|-
|-
| | *middle
|middle
| | 987-1000
|987-1000
|-
|-
| | *large
|large
| | 1000-1025
|1000-1025
|-
|-
| | [[Equable heptatonic|Equable Heptatonic]]
| | [[Equable heptatonic|Equable Heptatonic]]
| | 1018-1040
| | 1018-1040
|
|
|-
|-
| | [[Neutral seventh|Neutral Seventh]]s
| rowspan="3"|[[Neutral seventh|Neutral Seventh]]s
| | 1030-1075
| rowspan="3"| 1030-1075
|-
|small
| | *small
|1030-1043
| | 1030-1043
|-
| | *middle
| | 1043-1065
|-
|-
| | *large
|middle
| | 1065-1075
|1043-1065
|-
|-
| | [[Major seventh|Major Seventh]]s
|large
| | 1075-1140
|1065-1075
|-
|-
| | *small
| rowspan="3"| [[Major seventh|Major Seventh]]s
| | 1075-1100
|  rowspan="3"| 1075-1140
|small
|1075-1100
|-
|-
| | *middle
|middle
| | 1100-1120
|1100-1120
|-
|-
| | *large
|large
| | 1120-1140
|1120-1140
|-
|-
| | Octave less diesis
| | Octave less diesis
| | 1140-1170
| | 1140-1170
|
|
|-
|-
| | Octave less comma
| | Octave less comma
| | 1170-1200
| | 1170-1200
|
|
|-
|-
| | [[Octave|Pure Octave]] (2:1)
| | [[Octave|Pure Octave]] (2:1)
| | 1200
| | 1200
|
|
|}
|}


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* [[SKULO interval names]]
* [[SKULO interval names]]
* [[5L 2s/Interval categories]]
* [[5L 2s/Interval categories]]
* [[Supermajor and subminor]]
* [[Interval size measure]]
* [[Interval size measure]]
* [[Table of MOSes]]
* [[Gallery of just intervals]]
* [[Gallery of just intervals]]
* [[Universal solfege]] - [[solfege]] based on the Schulter system
* [[Universal solfege]] - [[solfege]] based on the Schulter system
Retrieved from "https://en.xen.wiki/w/Interval_region"