volume unit

volume unit
(vu)
   a unit used in telecommunications to describe the volume of a radio or television signal carrying complex information such as speech or music. These waves vary wildly in amplitude in order to represent the message they carry, so it is difficult to describe mathematically how large their "average" amplitude is. To solve this problem, the American Standards Association decided in 1951 to establish as a reference a signal which generates 1 milliwatt of power in a circuit having an impedance of 600 ohms. The volume of an incoming signal, in volume units, is equal to the number of decibels by which it exceeds this reference level. Thus the volume unit is (in a complicated way) a variation of the decibel.

Dictionary of units of measurement. 2015.

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