2/1: Difference between revisions
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{{Interwiki | |||
| en = 2/1 | |||
| de = Oktave | |||
| es = Octava | |||
| ja = オクターブ | |||
| ro = Octavă | |||
}} | |||
{{Infobox Interval | {{Infobox Interval | ||
| Ratio = 2/1 | | Ratio = 2/1 | ||
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| 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}}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. | }} | ||
==Octave equivalence== | {{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. | |||
== Octave equivalence == | |||
The octave is usually called the '''interval of equivalence''', because tones separated by an octave are perceived to have the same or similar pitch class to the average human listener. The reason for this phenomenon is probably due to the strong region of attraction of low [[harmonic entropy]], or the strong amplitude of the second [[harmonic]] in most harmonic instruments. | The octave is usually called the '''interval of equivalence''', because tones separated by an octave are perceived to have the same or similar pitch class to the average human listener. The reason for this phenomenon is probably due to the strong region of attraction of low [[harmonic entropy]], or the strong amplitude of the second [[harmonic]] in most harmonic instruments. | ||
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A generalisation where we let a different interval define equivalence is [[equave]], such as the [[tritave]]. | A generalisation where we let a different interval define equivalence is [[equave]], such as the [[tritave]]. | ||
== | |||
'''Ditave''' is an alternative name for the interval 2/1, which was proposed to neutralize the terminology against the predominance of 7-tone scales. The name is derived from the numeral prefix ''δι''- (''di-'', Greek for "two") in analogy to "[[tritave]]" (3/1) | == Alternative names == | ||
'''Ditave''' is an alternative name for the interval 2/1, which was proposed to neutralize the terminology against the predominance of 7-tone scales. The name is derived from the numeral prefix ''δι''- (''di-'', Greek for "two") in analogy to "[[tritave]]" (3/1). | |||
'''Diapason''' is another term also sometimes applied to 2/1. It is also of Greek origin, but not related to the number two; instead it is formed from ''διά'' (''dia'') + ''πασων'' (''pason''), meaning something like "through all the notes". | '''Diapason''' is another term also sometimes applied to 2/1. It is also of Greek origin, but not related to the number two; instead it is formed from ''διά'' (''dia'') + ''πασων'' (''pason''), meaning something like "through all the notes". | ||
==See also== | |||
*[[Prime interval]] | == See also == | ||
*[[Gallery of Just Intervals]] | * [[Prime interval]] | ||
*[[Toctave]] | * [[Gallery of Just Intervals]] | ||
*[[EDO]] | * [[Toctave]] | ||
*[[Octave reduction]] | * [[EDO]] | ||
*[[Octave complement]] | * [[Octave reduction]] | ||
*[[Octave (interval region)]] | * [[Octave complement]] | ||
==References== | * [[Octave (interval region)]] | ||
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== References == | |||
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