Interval size measure: Difference between revisions
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The [[cent]] (¢), [[1200edo|1\1200 octave]], is the classic measure for intervals when more precision than 12edo is required. Some people object to it on the grounds that it is too (obviously) closely related to 12 equal. | The [[cent]] (¢), [[1200edo|1\1200 octave]], is the classic measure for intervals when more precision than 12edo is required. Some people object to it on the grounds that it is too (obviously) closely related to 12 equal. | ||
The following table demonstrates a list of measures derived from the logarithmic division of | The following table demonstrates a list of measures derived from the logarithmic division of the octave: | ||
{| class="wikitable sortable" | {| class="wikitable sortable" | ||
|+List of Fine Measures (Logarithmic) | |+List of Octave-Based Fine Measures (Logarithmic) | ||
!Unit name (symbol): | !Unit name (symbol): | ||
! | !Division of Octave | ||
!Origin / Significance | |||
!Origin/Significance | |||
|- | |- | ||
|[[Armodue_theory|Eka]] | |[[Armodue_theory|Eka]] | ||
|[[16edo|1\16]] | |[[16edo|1\16]] | ||
|From Sanskrit ''eka'': one, unit; chromatic unit of Armodue 16ED2 Theory | |From Sanskrit ''eka'': one, unit; chromatic unit of Armodue 16ED2 Theory | ||
|- | |- | ||
|[[Normal_diesis|Normal diesis]] | |[[Normal_diesis|Normal diesis]] | ||
|[[31edo|1\31]] | |[[31edo|1\31]] | ||
| | | | ||
|- | |- | ||
|[[Méride]] | |[[Méride]] | ||
|[[43edo|1\43]] | |[[43edo|1\43]] | ||
|Proposed by Joseph Sauveur as 7 heptaméride units | |Proposed by Joseph Sauveur as 7 heptaméride units | ||
|- | |- | ||
|[[Holdrian_comma|Holdrian comma]] | |[[Holdrian_comma|Holdrian comma]] | ||
|[[53edo|1\53]] | |[[53edo|1\53]] | ||
| | | | ||
|- | |- | ||
|[[Morion]] | |[[Morion]] | ||
|[[72edo|1\72]] | |[[72edo|1\72]] | ||
| | | | ||
|- | |- | ||
|[[Farab]] | |[[Farab]] | ||
|[[144edo|1\144]] | |[[144edo|1\144]] | ||
|Proposed by al-Farabi in 10th century; 1/12 of [[12edo|12ED2]] semitone | |Proposed by al-Farabi in 10th century; 1/12 of [[12edo|12ED2]] semitone | ||
|- | |- | ||
|[[Mem]] | |[[Mem]] | ||
|[[205edo|1\205]] | |[[205edo|1\205]] | ||
|Unit used by [http://musictheory.zentral.zone/huntsystem1.html H-Pi Instruments] | |Unit used by [http://musictheory.zentral.zone/huntsystem1.html H-Pi Instruments] | ||
|- | |- | ||
|[[Tredek]] | |[[Tredek]] | ||
|[[270edo|1\270]] | |[[270edo|1\270]] | ||
| | | | ||
|- | |- | ||
|[[Eptaméride|Heptaméride/Eptaméride]] or [[Savart]] | |[[Eptaméride|Heptaméride/Eptaméride]] or [[Savart]] | ||
|[[301edo|1\301]] | |[[301edo|1\301]] | ||
|Proposed by Joseph Sauveur, advocated by Félix Savart; 301 ≃ 1,000 * log<sub>10</sub>2; 1/7 of Méride unit | |Proposed by Joseph Sauveur, advocated by Félix Savart; 301 ≃ 1,000 * log<sub>10</sub>2; 1/7 of Méride unit | ||
|- | |- | ||
|[[Gene]] | |[[Gene]] | ||
|[[311edo|1\311]] | |[[311edo|1\311]] | ||
| | | | ||
|- | |- | ||
|[[Dröbisch_Angle|Dröbisch Angle]] | |[[Dröbisch_Angle|Dröbisch Angle]] | ||
|[[360edo|1\360]] | |[[360edo|1\360]] | ||
| | | | ||
|- | |- | ||
|[[Squb]] | |[[Squb]] | ||
|[[494edo|1\494]] | |[[494edo|1\494]] | ||
| | | | ||
|- | |- | ||
|[[Iring]] | |[[Iring]] | ||
|[[600edo|1\600]] | |[[600edo|1\600]] | ||
| | | | ||
|- | |- | ||
|[[Skisma]] | |[[Skisma]] | ||
|[[612edo|1\612]] | |[[612edo|1\612]] | ||
| | | | ||
|- | |- | ||
|[[Delfi]] | |[[Delfi]] | ||
|[[665edo|1\665]] | |[[665edo|1\665]] | ||
| | | | ||
|- | |- | ||
|[[Woolhouse]] | |[[Woolhouse]] | ||
|[[730edo|1\730]] | |[[730edo|1\730]] | ||
|Proposed by Wesley S.B. Woolhouse in ''Essay on musical intervals'' (1835) | |Proposed by Wesley S.B. Woolhouse in ''Essay on musical intervals'' (1835) | ||
|- | |- | ||
|[[millioctave]] (mO) | |[[millioctave]] (mO) | ||
|[[1000edo|1\1000]] | |[[1000edo|1\1000]] | ||
|"Metric" / SI division of octave | |"Metric" / SI division of octave | ||
|- | |- | ||
|[[cent]] (¢) | |[[cent]] (¢) | ||
|1\1200 | |1\1200 | ||
|1/100 of [[12edo|12ED2]] semitone | |1/100 of [[12edo|12ED2]] semitone | ||
|- | |- | ||
|greater muon | |greater muon | ||
|[[1224edo|1\1224]] | |[[1224edo|1\1224]] | ||
| | | | ||
|- | |- | ||
|triangular cent | |triangular cent | ||
|[[1260edo|1\1260]] | |[[1260edo|1\1260]] | ||
| | | | ||
|- | |- | ||
|pion | |pion | ||
|[[1272edo|1\1272]] | |[[1272edo|1\1272]] | ||
| | | | ||
|- | |- | ||
|pound | |pound | ||
|[[1344edo|1\1344]] | |[[1344edo|1\1344]] | ||
| | | | ||
|- | |- | ||
|neutron | |neutron | ||
|[[1392edo|1\1392]] | |[[1392edo|1\1392]] | ||
| | | | ||
|- | |- | ||
|lesser muon | |lesser muon | ||
|[[1428edo|1\1428]] | |[[1428edo|1\1428]] | ||
| | | | ||
|- | |- | ||
|deciFarab | |deciFarab | ||
|[[1440edo|1\1440]] | |[[1440edo|1\1440]] | ||
|1/10 of Farab unit | |1/10 of Farab unit | ||
|- | |- | ||
|quadratic cent | |quadratic cent | ||
|[[1452edo|1\1452]] | |[[1452edo|1\1452]] | ||
| | | | ||
|- | |- | ||
|ksion | |ksion | ||
|[[1476edo|1\1476]] | |[[1476edo|1\1476]] | ||
| | | | ||
|- | |- | ||
|cubic cent | |cubic cent | ||
|[[1500edo|1\1500]] | |[[1500edo|1\1500]] | ||
| | | | ||
|- | |- | ||
|7mu | |7mu | ||
|[[1536edo|1\1536]] | |[[1536edo|1\1536]] | ||
|(7th MIDI unit), seventh MIDI-resolution unit, 1/128 (1/(2<sup>7</sup>)) of [[12edo|12ED2]] semitone | |(7th MIDI unit), seventh MIDI-resolution unit, 1/128 (1/(2<sup>7</sup>)) of [[12edo|12ED2]] semitone | ||
|- | |- | ||
|rhoon | |rhoon | ||
|[[1560edo|1\1560]] | |[[1560edo|1\1560]] | ||
| | | | ||
|- | |- | ||
|tile | |tile | ||
|[[1632edo|1\1632]] | |[[1632edo|1\1632]] | ||
| | | | ||
|- | |- | ||
|[[Iota]] | |[[Iota]] | ||
|[[1\1700_octave|1\1700]] | |[[1\1700_octave|1\1700]] | ||
| | | | ||
|- | |- | ||
|[[Harmos]] | |[[Harmos]] | ||
|[[1728edo|1\1728]] | |[[1728edo|1\1728]] | ||
| | | | ||
|- | |- | ||
|[[Mina]] | |[[Mina]] | ||
|[[2460edo|1\2460]] | |[[2460edo|1\2460]] | ||
|Abbreviation of "schismina", ED2 representation of the "Olympian Level" of [[Sagittal_notation|Sagittal notation system]] | |Abbreviation of "schismina", ED2 representation of the "Olympian Level" of [[Sagittal_notation|Sagittal notation system]] | ||
|- | |- | ||
|[[Tina]] | |[[Tina]] | ||
|[[8539edo|1\8539]] | |[[8539edo|1\8539]] | ||
|Prime; provides good approximations for 41-limit primes except 37; named by [[Dave_Keenan|Keenan]] and [[George_Secor|Secor]]. | |Prime; provides good approximations for 41-limit primes except 37; named by [[Dave_Keenan|Keenan]] and [[George_Secor|Secor]]. | ||
|- | |- | ||
|[[Purdal]] | |[[Purdal]] | ||
|[[9900edo|1\9900]] | |[[9900edo|1\9900]] | ||
| | | | ||
|- | |- | ||
|[[Türk_sent|Türk sent]] | |[[Türk_sent|Türk sent]] | ||
|[[10600edo|1\10600]] | |[[10600edo|1\10600]] | ||
| | | | ||
|- | |- | ||
|[[Prima]] | |[[Prima]] | ||
|[[12276edo|1\12276]] | |[[12276edo|1\12276]] | ||
| | | | ||
|- | |- | ||
|[[Jinn]] | |[[Jinn]] | ||
|[[16808edo|1\16808]] | |[[16808edo|1\16808]] | ||
| | | | ||
|- | |- | ||
|[[Jot]] | |[[Jot]] | ||
|[[30103edo|1\30103]] | |[[30103edo|1\30103]] | ||
| | | | ||
|- | |- | ||
|[[Imp]] | |[[Imp]] | ||
|[[31920edo|1\31920]] | |[[31920edo|1\31920]] | ||
| | | | ||
|- | |- | ||
|[[Flu]] | |[[Flu]] | ||
|[[46032edo|1\46032]] | |[[46032edo|1\46032]] | ||
| | | | ||
|- | |- | ||
|[[MIDI_Tuning_Standard_unit|MIDI Tuning Standard unit]] | |[[MIDI_Tuning_Standard_unit|MIDI Tuning Standard unit]] | ||
|[[196608edo|1\196608]] | |[[196608edo|1\196608]] | ||
|14mu (14th MIDI unit), fourteenth MIDI-resolution unit, 1/16384 (1/(2<sup>14</sup>)) of [[12edo|12ED2]] semitone | |14mu (14th MIDI unit), fourteenth MIDI-resolution unit, 1/16384 (1/(2<sup>14</sup>)) of [[12edo|12ED2]] semitone | ||
|} | |||
There are other fine measurements based upon the logarithmic division of other intervals (e.g. 3/1 (twelfth)), a few of which are listed below: | |||
{| class="wikitable sortable" | |||
|+List of Non-Octave Fine Measures (Logarithmic) | |||
!Unit name (symbol): | |||
!Interval based on: | |||
!Power: | |||
!Origin/Significance | |||
|- | |- | ||
|[[Hekt]] | |[[Hekt]] | ||