2/1 - Revision history

FloraC: Hatnote directly to interval region

2026-07-12T20:18:06Z

Hatnote directly to interval region

← Older revision		Revision as of 20:18, 12 July 2026
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	}}		}}
	{{Wikipedia\|Octave}}		{{Wikipedia\|Octave}}
	{{Redirect\|Octave\|~~other uses~~\|Octave (~~disambiguation~~)}}		{{Redirect\|Octave\|its use as an [[interval region]]\|Octave (interval region)}}
	The '''octave''' (abbreviation: '''8ve''', symbol: '''oct''', [[frequency ratio]]: '''2/1''') is one of the most basic [[Gallery of just intervals\|intervals]] found in musical systems throughout the entire world. It has a frequency ratio of 2/1 and a size of 1200 [[cent]]s. It is used as the standard of [[interval size measure\|logarithmic measurement]] for all intervals, regardless if they are justly tuned or not.		The '''octave''' (abbreviation: '''8ve''', symbol: '''oct''', [[frequency ratio]]: '''2/1''') is one of the most basic [[Gallery of just intervals\|intervals]] found in musical systems throughout the entire world. It has a frequency ratio of 2/1 and a size of 1200 [[cent]]s. It is used as the standard of [[interval size measure\|logarithmic measurement]] for all intervals, regardless if they are justly tuned or not.

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	== Octave equivalence ==		== Octave equivalence ==
	{{~~main~~\|Interval of equivalence}}		{{Main\|Interval of equivalence}}

	The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same [[pitch class]] despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name. For the same reason, most [[scale]]s repeat at the octave.		The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same [[pitch class]] despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name. For the same reason, most [[scale]]s repeat at the octave.

	== Octave stretch ==		== Octave stretch ==
	{{~~main~~\|Stretched and compressed tuning}}		{{Main\|Stretched and compressed tuning}}

	Some musical systems exhibit stretched (or compressed) octaves where the octave is tuned slightly different from a pure 2:1 ratio. This occurs in piano tuning (to compensate for inharmonicity in piano strings) and in some traditional music systems, such as the Indonesian [[Pelog]] and [[Slendro]] scales.		Some musical systems exhibit stretched (or compressed) octaves where the octave is tuned slightly different from a pure 2:1 ratio. This occurs in piano tuning (to compensate for inharmonicity in piano strings) and in some traditional music systems, such as the Indonesian [[Pelog]] and [[Slendro]] scales.
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	== See also ==		== See also ==
	* [[Prime interval]]		* [[Prime interval]]
	* [[Gallery of ~~Just Intervals~~]]		* [[Gallery of just intervals]]
	* [[EDO]]		* [[EDO]]
	* [[Octave reduction]]		* [[Octave reduction]]
	* [[Octave complement]]		* [[Octave complement]]
	* [[Octave (interval region)]]

Fredg999: Remove unused references section

2026-07-12T19:50:42Z

Remove unused references section

← Older revision		Revision as of 19:50, 12 July 2026
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	* [[Octave complement]]		* [[Octave complement]]
	* [[Octave (interval region)]]		* [[Octave (interval region)]]

	~~== References ==~~
	~~<references/>~~

Fredg999: Redirect hatnote

2026-07-12T19:45:45Z

Redirect hatnote

← Older revision		Revision as of 19:45, 12 July 2026
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	}}		}}
	{{Wikipedia\|Octave}}		{{Wikipedia\|Octave}}
			{{Redirect\|Octave\|other uses\|Octave (disambiguation)}}
	The '''octave''' (abbreviation: '''8ve''', symbol: '''oct''', [[frequency ratio]]: '''2/1''') is one of the most basic [[Gallery of just intervals\|intervals]] found in musical systems throughout the entire world. It has a frequency ratio of 2/1 and a size of 1200 [[cent]]s. It is used as the standard of [[interval size measure\|logarithmic measurement]] for all intervals, regardless if they are justly tuned or not.		The '''octave''' (abbreviation: '''8ve''', symbol: '''oct''', [[frequency ratio]]: '''2/1''') is one of the most basic [[Gallery of just intervals\|intervals]] found in musical systems throughout the entire world. It has a frequency ratio of 2/1 and a size of 1200 [[cent]]s. It is used as the standard of [[interval size measure\|logarithmic measurement]] for all intervals, regardless if they are justly tuned or not.

Overthink: + prime harmonic

2026-03-19T05:38:47Z

+ prime harmonic

← Older revision		Revision as of 05:38, 19 March 2026
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	{{Wikipedia\|Octave}}		{{Wikipedia\|Octave}}
	The '''octave''' (abbreviation: '''8ve''', symbol: '''oct''', [[frequency ratio]]: '''2/1''') is one of the most basic [[Gallery of just intervals\|intervals]] found in musical systems throughout the entire world. It has a frequency ratio of 2/1 and a size of 1200 [[cent]]s. It is used as the standard of [[interval size measure\|logarithmic measurement]] for all intervals, regardless if they are justly tuned or not.		The '''octave''' (abbreviation: '''8ve''', symbol: '''oct''', [[frequency ratio]]: '''2/1''') is one of the most basic [[Gallery of just intervals\|intervals]] found in musical systems throughout the entire world. It has a frequency ratio of 2/1 and a size of 1200 [[cent]]s. It is used as the standard of [[interval size measure\|logarithmic measurement]] for all intervals, regardless if they are justly tuned or not.

			It is the first [[prime harmonic]], with the next being [[3/1]].

	== Octave equivalence ==		== Octave equivalence ==

FloraC: Undo revision 211120 by M1k1 H2tsun2 (talk)

2025-09-27T11:46:27Z

Undo revision 211120 by M1k1 H2tsun2 (talk)

← Older revision		Revision as of 11:46, 27 September 2025
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	{{Infobox Interval		{{Infobox Interval
	\| Ratio = 2/1		\| Ratio = 2/1
	\| Name = octave~~, eighth~~, ditave, duple, diapason,		\| Name = octave, ditave, duple, diapason
	\| Color name = w8, wa 8ve		\| Color name = w8, wa 8ve
	\| Sound = jid_2_1_pluck_adu_dr220.mp3		\| Sound = jid_2_1_pluck_adu_dr220.mp3

M1k1 H2tsun2: add it the word "eighth" in the other one.

2025-09-27T10:30:52Z

add it the word "eighth" in the other one.

← Older revision		Revision as of 10:30, 27 September 2025
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	{{Infobox Interval		{{Infobox Interval
	\| Ratio = 2/1		\| Ratio = 2/1
	\| Name = octave, ditave, duple, diapason		\| Name = octave, eighth, ditave, duple, diapason,
	\| Color name = w8, wa 8ve		\| Color name = w8, wa 8ve
	\| Sound = jid_2_1_pluck_adu_dr220.mp3		\| Sound = jid_2_1_pluck_adu_dr220.mp3

Sintel: /* Octave equivalence */ Shorten section, and link to new article

2025-04-30T17:50:00Z

Octave equivalence: Shorten section, and link to new article

← Older revision		Revision as of 17:50, 30 April 2025
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	{{main\|Interval of equivalence}}		{{main\|Interval of equivalence}}
	The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same [[pitch class]] despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name. For the same reason, most [[scale]]s repeat at the octave.		The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same [[pitch class]] despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name. For the same reason, most [[scale]]s repeat at the octave.

	~~The perception of octave equivalence appears to have both biological and cultural components.~~
	Studies have shown that various non-human animals, including rhesus monkeys and rats, experience octave equivalence to a certain extent.<ref>Hoeschele M. [https://doi.org/10.3819/CCBR.2017.120002 ''Animal Pitch Perception: Melodies and Harmonies'']. Comp Cogn Behav Rev. 2017</ref>
	However, the degree of octave equivalence perception varies across cultures, particularly in those with non-Western musical traditions.<ref>Jacoby, Nori et al. [https://doi.org/10.1016/j.cub.2019.08.020 ''Universal and Non-universal Features of Musical Pitch Perception Revealed by Singing'']. Current Biology, 2019.</ref>

	~~When a different interval (such as the [[tritave]]) is used as the interval of equivalence, it is referred to as an [[equave]] or "formal octave".~~

	== Octave stretch ==		== Octave stretch ==

Sintel: /* Octave equivalence */

2025-04-30T17:49:04Z

Octave equivalence

← Older revision		Revision as of 17:49, 30 April 2025
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	== Octave equivalence ==		== Octave equivalence ==
			{{main\|Interval of equivalence}}
	The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same [[pitch class]] despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name. For the same reason, most [[scale]]s repeat at the octave.		The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same [[pitch class]] despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name. For the same reason, most [[scale]]s repeat at the octave.

Sintel: /* Octave equivalence */ link pitch class

2025-04-24T21:04:00Z

Octave equivalence: link pitch class

← Older revision		Revision as of 21:04, 24 April 2025
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	== Octave equivalence ==		== Octave equivalence ==
	The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same "pitch class" despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name. For the same reason, most [[scale]]s repeat at the octave.		The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same [[pitch class]] despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name. For the same reason, most [[scale]]s repeat at the octave.

	The perception of octave equivalence appears to have both biological and cultural components.		The perception of octave equivalence appears to have both biological and cultural components.

Sintel: fix DOI, -"Toctave"

2025-04-23T22:21:38Z

fix DOI, -"Toctave"

← Older revision		Revision as of 22:21, 23 April 2025
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	The perception of octave equivalence appears to have both biological and cultural components.		The perception of octave equivalence appears to have both biological and cultural components.
	Studies have shown that various non-human animals, including rhesus monkeys and rats, experience octave equivalence to a certain extent.<ref>Hoeschele M. [https://doi.org/10.3819/CCBR.2017.120002 ''Animal Pitch Perception: Melodies and Harmonies'']. Comp Cogn Behav Rev. 2017</ref>		Studies have shown that various non-human animals, including rhesus monkeys and rats, experience octave equivalence to a certain extent.<ref>Hoeschele M. [https://doi.org/10.3819/CCBR.2017.120002 ''Animal Pitch Perception: Melodies and Harmonies'']. Comp Cogn Behav Rev. 2017</ref>
	However, the degree of octave equivalence perception varies across cultures, particularly in those with non-Western musical traditions.<ref>Jacoby, Nori et al. [https://doi.org/10.~~17605~~/~~OSF~~.~~IO/DW39V~~ ''Universal and Non-universal Features of Musical Pitch Perception Revealed by Singing'']. Current Biology, 2019.</ref>		However, the degree of octave equivalence perception varies across cultures, particularly in those with non-Western musical traditions.<ref>Jacoby, Nori et al. [https://doi.org/10.1016/j.cub.2019.08.020 ''Universal and Non-universal Features of Musical Pitch Perception Revealed by Singing'']. Current Biology, 2019.</ref>

	When a different interval (such as the [[tritave]]) is used as the interval of equivalence, it is referred to as an [[equave]] or "formal octave".		When a different interval (such as the [[tritave]]) is used as the interval of equivalence, it is referred to as an [[equave]] or "formal octave".
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	* [[Prime interval]]		* [[Prime interval]]
	* [[Gallery of Just Intervals]]		* [[Gallery of Just Intervals]]
	* [[Toctave]]
	* [[EDO]]		* [[EDO]]
	* [[Octave reduction]]		* [[Octave reduction]]