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Old 1st May 2019
  #16
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bluecataudio's Avatar
 

Anyway, what is called "True Peak Limiting" is actually not entirely "true", and we could probably debate about it for decades :-). The typical specification for "true peak" measurement (that comes from the ITU and EBU R128 loudness measurement norms) just requires 4x linear phase oversampling. So it adds latency, and there could still be inter-sample peaks above 0 dB when converted back to analog: it's just that you are catching more using oversampling. So we preferred not to add such an option on Protector.

What is really important to us is that once a signal has been limited using a non-"true peak" limiter such as Protector, the audio data can be converted to fixed point audio formats files without extra clipping - so there is no data loss.

Another funny thing about this topic is that most devices used to listen to music nowadays use are purely digital processing chain, and the volume control operates most of the time before the DAC. So unless you listen to music at full volume, you are not likely to test the performance of your DAC on true peaks (and your ears might start distorting earlier :-)).

True Peak limiting is however necessary when you need to deliver audio for channels that specify true peak and loudness levels, but that's another story.