volume indicator [`väl·yǝm ´in·dǝ´kād·ǝr] ENGINEERING ACOUSTICS A standardized instrument for indicating the volume of a complex electric wave such as that corresponding to speech or music; the reading in volume units is equal to the number of decibels above a reference level which is realized when the instrument is connected across a 600- ohm resistor that is dissipating a power of 1 milliwatt at 100 hertz. Also known as volume unit meter. |