A VU meter is often included in
analog audio equipment to display a
signal level in
volume units.It is intentionally a "slow" measurement, averaging out peaks and troughs of short duration to reflect the perceived
loudness of the material. It was originally developed in 1939 by the combined effort of
Bell Labs and broadcasters
CBS and
NBC, for measuring and standardizing the levels of
telephone lines. The instrument used to measure VU is called the volume indicator (VI) instrument. Most users ignore this and call it a VU meter.
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INDICATORE DEL VOLUME DI REGISTRAZIONE. INDICATORE DI DECIBEL
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