Level Magic™ is a comprehensive loudness measurement, correction and management algorithm designed to ensure compliance with all current worldwide loudness standards. Based on the underlying ITU-R BS.1770(-1/2/3) principle, Level Magic provides compatibility with EBU R128, ATSC A/85, ARIB TR-B32, FREE TV OP-59 and Portaria 354. Designed to be audibly transparent, Level Magic™ utilises a proprietary multi-loop approach comprising of three essential elements in parallel to measure, and if necessary correct, out of specification audio. An AGC section controls slower changing levels over time whilst a fast acting transient processor catches inaudible high frequency overshoots that may otherwise cause detrimental effects in downstream processing or coding. A brickwall filter provides effective True Peak limiting using a 2ms look-ahead to capture any intersample peaks. The resultant gain changing signal is a combination of all three elements. The Level Magic™ algorithm is highly adaptive to the structure of the incoming audio and requires only a small number of parameters to be set by the user. The result is audio compliant with the selected standard but free of any unwanted artefacts such as pumping, breathing or distortion.
See also: Level Magic™ Loudness Leveling