Octave band

An octave band is a frequency band that spans one octave (Playⓘ). In this context an octave can be a factor of 2 or a factor of 10 0.3. To remove the ambiguity, an alternative name suggested for a factor of 100.3 is "dectave", a portmanteau of "decimal" and "octave". An octave of 1200 cents in musical pitch (a logarithmic unit) corresponds to a frequency ratio of   ⁠2/ 1 ⁠ ≈ 10 0.301 .

An international standard set of octave bands and one-third octave bands has been developed for frequency analysis in acoustics. A band is said to be an octave in width when the upper band frequency is approximately twice the lower band frequency.


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