So if you need to guarantee a true peak level of -1.0 dB for example, set the output level to -1.2 dB or even -1.5 dB. The downside is that BS.1770 calibrated true peak meters will also detect overshoots of up to 0.2 dB with LoudMax ISP detection. Therefore LoudMax uses optimized coefficients that do not affect transients and reduce the overshoots to similar values with all true peak meters tested. They have a negative effect on transients and lead to high overshoots in true peak meters that use higher quality upsampling. Unfortunately these coefficients do not seem to be optimal for limiters. ITU-R BS.1770: There are coefficients given in this recommendation for the calculation of inter-sample peaks. This reduces true peak overshoots for proper band-limited audio to 0.2 dB and for pathological signals to 0.5 dB. When ISP is turned on, four additional samples are calculated between every two samples present. from 44.1 to 48 kHz or vice versa, and the use of audio compression such as MP3 or AAC.įor more information see the "Tutorials" section. This can become a problem not only with poor D/A converters, but also with subsequent sample rate conversions, e.g. These true peak overshoots can be up to 3 dB for proper band-limited audio and even much more for pathological signals. The higher the frequency, the greater the probability that the true peak will be between two digital audio samples. LoudMax is available as VST 2.4 and VST 3 Plugin for Windows and Mac OS X, Audio Unit Plugin for Mac OS X, LADSPA Plugin for Linux x86 and as Winamp Plugin.
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