We generated the loudness plots accompanying the demonstrations using the methods described in the International Telecommunications Union (ITU) Recommendation ITU-R BS.1770. This recommendation was designed to provide an accurate indication of the perceived loudness level of any given program material. Evolved beyond other traditional meters that have long been used in audio/visual production, such as VU and peak program meters, the ITU-R BS.1770 metering system incorporates a sophisticated algorithm which compensates for the acoustic effects of the head and sensitivity of the human hearing system, as well as the effects of multi-channel playback on perceived loudness.

For more information on Loudness Metering and the ITU-R BS.1770 recommendation, please check the ITU-R BS.1770 standard.