Octave band analysis is used to measure what aspect of sound?

• A. The energy of sound over a range of frequencies
• B. The speed of a sound wave
• C. The color of sound
• D. The phase of a signal

Answer: (A)

Octave band analysis focuses on how sound energy is distributed across frequencies by splitting the spectrum into octave-spaced bands and measuring the sound level in each band. This lets you see which frequency ranges carry more energy and how they contribute to the overall noise. It’s a practical way to characterize a sound’s spectrum, aid in selecting appropriate hearing protection, and assess compliance with standards. It does not measure how fast a sound wave travels, the color or timbre of the sound, or the phase relationship of the signal, since those are different properties.