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What is PPM audio?
https://askinglot.com/what-is-ppm-audio
A volume unit (VU) meter or standard volume indicator (SVI) is a device displaying a representation of the signal level in audio equipment. Also, how is audio level measured? dB or decibels Audio signal or sound levels are measured using a decibel (dB) system. The dB system is used to compare two levels or a change in signal voltage or power. One dB is the level …
VU and PPM Audio Meters – An Elementary Explanation – MCC ...
https://www.memphiscommunications.net/2015/08/13/vu-and-ppm-audio-meters-an-elementary-explanation/
For a steady state sine wave tone, the difference between the average level (VU) and the peak level (PPM) is about 3 dB. But for a complex audio signal (speech or music), the difference between the average level (VU) and the peak level (PPM) can be 10 to 12 dB! This difference between the reading of a VU meter and a PPM is known as the crest factor.
Is there a difference between a VU and a PPM audio meter?
https://service.shure.com/s/article/is-there-a-difference-between-a-vu-and-a-ppm-audio-meter
For a steady state sine wave tone, the difference between the average level (VU) and the peak level (PPM) is about 3 dB. But for a complex audio signal (speech or music), the difference between the average level (VU) and the peak level (PPM) can be 10 to 12 dB! This difference between the reading of a VU meter and a PPM is known as the crest factor.
Getting Your Levels Right - PPMs, clipping and all that
http://www.blitzfamily.eclipse.co.uk/paulblitz.co.uk/tech_tips/techtip/art4.htm
Custom and practice in the broadcast audio industry (at least in the UK) says that you aim to have the peak signal in normal broadcasts 8dB above the reference or line-up level (0dBu / PPM 4). This equates to PPM 6.
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