Which term directly relates to the frequency-based energy distribution in sound analysis?

• A. Octave band analysis measures energy across a range of frequencies.
• B. It measures energy in only a single narrow band.
• C. It evaluates humidity in the environment.
• D. It computes the speed of wind.

Answer: (A)

The main idea is how energy is spread across different frequencies in sound. Octave band analysis is the term that directly describes that distribution. It breaks the audio spectrum into bands that cover ranges of frequencies defined as octaves and measures the energy within each band, giving a clear profile of low-, mid-, and high-frequency energy. This lets you see how much energy sits in each portion of the spectrum, rather than just a total amount.

If you measure energy in a single narrow band, you’d be looking at energy at only one specific frequency range, not the overall distribution across all frequencies. Humidity or wind speed aren’t related to how sound energy is distributed across the spectrum, so those options don’t fit.