Octave band analysis is performed for what purpose?

• A. Determine engineering
• B. Select hearing protection
• C. Measure the sound pressure levels in the audiometric booths
• D. Gather information on the energy of sound over a range of frequencies

Answer: (D)

Octave band analysis breaks the sound spectrum into octave-spaced bands and measures how much energy sits in each band, giving a frequency-resolved view of the noise rather than a single overall level. This spectral view shows which frequencies carry most of the energy, which is crucial for understanding potential hearing risk and for guiding controls or hearing protection that are effective across the relevant parts of the spectrum. It’s more informative than just measuring a total SPL in a booth or performing a vague engineering assessment, because it directly describes how energy is distributed across frequencies. So the main purpose is to gather information on the energy of sound over a range of frequencies.