A unit used to express differences in electrical or acoustical signals including, for example, how noisy a motion picture camera or airplane is, or how much Gain a dark location requires. Formula: Equal to 10 times the logarithm of the two levels. Also see: Gain; and White Balance.tiffaneduglossary
Logarithmic scale used to describe phenomena taking a large range of values. Decibels are not a unit and always describe the ratio to a reference value like Signal to Noise Ratio.