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An analog VU meter with peak LED. A volume unit (VU) meter or standard volume indicator (SVI) is a device displaying a representation of the signal level in audio equipment.. The original design was proposed in the 1940 IRE paper, A New Standard Volume Indicator and Reference Level, written by experts from CBS, NBC, and Bell Telephone Laboratories. [1]
Audacity won the SourceForge 2007 and 2009 Community Choice Award for Best Project for Multimedia. [47] [48] Jamie Lendino of PC Magazine recently rated it 4/5 stars Excellent and said: "If you're looking to get started in podcasting or recording music, it's tough to go wrong with Audacity. A powerful, free, open-source audio editor that's been ...
The VU meter may also be switched to show the gain reduction or output level. The average attack time is 10 milliseconds, [ 5 ] while the release time is about 60 ms for 50% release and 0.5 to 5 seconds for full release, depending on the previous program material.
These were Type II PPMs with the seven marks labelled −22, −16, −12, −8, −4, 0 and +4. ABC found that a modified version of the EBU meter based on the VU-meter 'A scale' was best, since it let operators use their usual jargon such as 'zero level' etc. [19] The appearance is similar to an EBU scale except that the numbers are 8 dB lower.
Thus, the meter might not ever accurately reflect the signal at every instant of time, but the constantly changing level, combined with the slower response time, led to more of an average indication. By comparison, a peak meter is designed to respond so quickly that the meter display reacts in exact proportion to the voltage of the audio signal.
Loudness monitoring of programme levels is needed in radio and television broadcasting, as well as in audio post production.Traditional methods of measuring signal levels, such as the peak programme meter and VU meter, do not give the subjectively valid measure of loudness that many would argue is needed to optimise the listening experience when changing channels or swapping disks.