Source: http://EzineArticles.com/5652931
Thursday, January 6, 2011
Exploring VU Meter Concepts
The volume unit (VU) meter, invented in 1939, is an electromechanical device designed to display average audio frequency signal levels. Its measurement scale is logarithmic and typically registers levels from minus 20 dB to plus-3 decibels (dB). The 0 dB (0 VU) reference level represents a 1,000 Hz sine wave signal with a voltage amplitude necessary to dissipate 1mW into a 600 ohm load.
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