One-third octave refers to a method of dividing the octave into smaller frequency bands for analysis, particularly in acoustics and audio engineering. An octave is a doubling of frequency; for example, if 100 Hz is one frequency, 200 Hz is one octave higher. In a one-third octave analysis, each octave is further divided into three bands. This means that each one-third octave band covers a specific range of frequencies, allowing for more detailed frequency analysis.
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