ABSTRACT
The loudness meters from Dorrough Electronics have been widely used both in music production and broadcast since their introduction in the 1970s. The loudness impression is derived from an average reading of the program signal. The Dolby® LM100 Broadcast Loudness Meter is developed as a tool for measuring the subjective loudness of dialogue within broadcast programming. The background for this is the fact that the dialogue can be regarded as the “anchor element” of a program; lining up dialogue levels provides better equality of the loudness within and between programs. The LM100 employs the proprietary technology Dialogue Intelligence™ to measure the perceived loudness of dialogue in a complex program. The European Broadcast Union wanted to implement the loudness measure already accepted by the International Telecommunication Union. The computation of the Loudness Range is based on the statistical distribution of measured loudness using a sliding 3-second analysis window for integration.
