![]() ![]() To account for differences in how people respond to sound, the "A-weighted" scale ( dBA) is used. We are less able to hear low frequencies like the rumble of thunder but hear high frequencies like the cry of a baby more strongly. The human ear also responds to different pitches or frequencies of sound differently. Decibels, which are measured on a logarithmic scale, correspond to the way our ears interpret sound pressures. The human ear hears sound pressures over a wide range. The decibel ( db) is the unit used to measure the intensity of a sound. Noise, then, has both an objective, physical component as well as a subjective component that takes account of a person's individual perception, or reaction, to a sound. Even sounds that are pleasant at one volume can become noise to us as they get louder. Other sounds, like a neighbor's barking dog in the middle of the night, are more universally found to be annoying. Some sounds, like a distant train whistle, can be a pleasant sound for some, while being considered noise by others. You can feel how much more energy goes into yelling. The more energy put into making a sound, the louder it will be. ![]() ![]() Sound is energy transferred through the air that our ears detect as small changes in air pressure. Recreational Flyers & Modeler Community-Based Organizations.Critical Infrastructure & Public Venues.Certificated Remote Pilots including Commercial Operators.Legislation & Policies, Regulations & Guidance.Data & Research Subnav: Data & Research 1.Airport Safety Information Video Series.Passenger Facility Charge (PFC) Program.Airport Coronavirus Response Grant Program.General Aviation & Recreational Aircraft.Vintage & Experimental Aircraft Program.Aviation Safety Draft Documents Open for Comment. ![]()
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