volume unit

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volume unit

[′väl·yəm ‚yü·nət]
(engineering acoustics)
A unit for expressing the audio-frequency power level of a complex electric wave, such as that corresponding to speech or music; the power level in volume units is equal to the number of decibels above a reference level of 1 milliwatt as measured with a standard volume indicator. Abbreviated VU.
References in periodicals archive ?
The proof is the absolute phase opposition VU meter which reached the level--78dB, Fig 3.
His design also includes a real-time VU meter display using some of the dsPIC30F's unique instructions to facilitate the fast calculation of decibels on the LCD display.