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{{Infobox Interval | {{Infobox Interval | ||
| Ratio = 2/1 | | Ratio = 2/1 | ||
| Name = octave | | 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 | ||
}} | }} | ||
{{Wikipedia|Octave}} | {{Wikipedia|Octave}} | ||
{{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. | ||
It is the first [[prime harmonic]], with the next being [[3/1]]. | |||
== 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. | ||
== Octave stretch == | == Octave stretch == | ||
{{ | {{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 | * [[Gallery of just intervals]] | ||
* [[EDO]] | * [[EDO]] | ||
* [[Octave reduction]] | * [[Octave reduction]] | ||
* [[Octave complement]] | * [[Octave complement]] | ||