The head and torso also influence the sound waves. The shape of the ear and size of the ear canal shape and direct the sound waves to the eardrum. Human hearing is influenced by many physical factors. A-weighted decibels are primarily designed for use with a pure frequency tone but are generally used for all noise measurements. Most modern sound meters automatically convert to A-weighted decibels. A-weighting the measurements from a sound meter gives more value to where the ear is more sensitive and less value to frequencies that the ear is not as sensitive to. Sound measurement equipment, such as a microphone, would hear all frequencies equally in decibels. People can hear between 20 hertz and 20 kilohertz (kHz), but it is much more sensitive to frequencies in the 250-5,000 Hz range. Human hearing is not equally sensitive to all sound frequencies. The sound pressure level, historically called the decibel (dB), is the absolute amount of pressure change exerted in the air by a sound. A-weighting is the most common, but other weighting systems exist. A-weighting is the standard for determining hearing damage and noise pollution. A-weighting gives more value to frequencies in the middle of human hearing and less value to frequencies at the edges as compared to a flat audio decibel measurement.
What is an A-weighted decibel (dBA or dB(A))?Ī-weighted decibel (dBA or dB(A)) is an expression of the relative loudness of sounds as perceived by the human ear.
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