This is an excellent metering system that provides a new and very accurate Loudness Meter scaled in LUFS - which does a much better job than the VU - along with an oversampled True Peak Meter scaled in dBTP, which does a much better job than the PPM. However, in our modern digital world, neither meter really performs adequately, and the current state of the art is enshrined in the new ITU-R BS1770 standard, which is being adopted very rapidly around the world in the broadcast sector and elsewhere. SOS Technical Editor Hugh Robjohns replies: These are both, strictly speaking, obsolete analogue metering formats! In short, the VU meter shows an averaged signal level and gives an impression of perceived loudness, while a PPM indicates something closer to the peak amplitude of the input signal. I recently came across a plug-in that incorporates both VU and PPM metering, and it got me thinking: what exactly is the difference between the two?
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