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An octave is the interval between one musical pitch and another with double or half its frequency. For example, if one note has a frequency of 440 Hz, the note one octave above is at 880 Hz, and the note one octave below is at 220 Hz. The ratio of frequencies of two notes an octave apart is therefore 2:1.
For example, the frequency one octave above 40 Hz is 80 Hz. The term is derived from the Western musical scale where an octave is a doubling in frequency. [note 1] Specification in terms of octaves is therefore common in audio electronics. Along with the decade, it is a unit used to describe frequency bands or frequency ratios. [1] [2]
An octave band is a frequency band that spans one octave (Play ⓘ).In this context an octave can be a factor of 2 [1] [full citation needed] or a factor of 10 0.301. [2] [full citation needed] [3] [full citation needed] An octave of 1200 cents in musical pitch (a logarithmic unit) corresponds to a frequency ratio of 2 / 1 ≈ 10 0.301.
To go from A 4 up two semitones (one whole tone) to B 4, multiply 440 twice by the twelfth root of two (or once by the sixth root of two, approximately 1.122462). To go from A 4 up three semitones to C 5 (a minor third ), multiply 440 Hz three times by the twelfth root of two (or once by the fourth root of two, approximately 1.189207).
How many decades is one octave? One octave is a factor of 2, so = decades per octave (decade = just major third + three octaves, 10/1 (Play ⓘ) = 5/4) To find out what frequency is a certain number of decades from the original frequency, multiply by appropriate powers of 10:
One of my first jobs was in a band called Bugz in the Attic, and they were very much part of this scene… around like soul music and Afrobeat and Rare Groove and Latin rhythm, and made this ...
The octave starting at middle C is called the "small" octave. Notes in it are written as lower case letters, so middle C itself is written c in Helmholtz notation. The next higher octave is called "one-lined". Notes in it include a prime symbol above the note's letter. Names of subsequently higher octaves use higher numbers before the "lined".
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