What is frequency and how is it weighted?

The healthy young person's ear senses tones (frequencies) in the range of 20 and 20,000 Hertz (Hz). Because the human ear doesn't respond to all of these frequencies equally, weightings are applied to more accurately quantify what the ear is actually sensing.

A-weighting (dBA) is the approximate response of the human ear therefore, A-weighting is the most commonly used by airports as directed by FAA Part 150 guidelines.

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