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octave band
Analyzing a source on a frequency by frequency basis is possible but time consuming. The whole frequency range is divided into set of frequencies called bands. Each band covers a specific range of frequencies. For this reason, a scale of octave bands and one-third octave bands has been developed. A frequency is said to be an octave in width when the upper band frequency is twice the lower band frequency. A one-third octave band is defined as a frequency band whose upper band-edge frequency (f2) is the lower band frequency (f1) times the cube root of two.
==Calculation==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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