There are many applications where it is desirable to objectively measure the perceived loudness of typical audio signals. The ITU-R is investigating suitable objective measures (meters) that would allow the perceived loudness of various program materials to be equalized for broadcast applications. Ten objective loudness meters were submitted for formal evaluation by several private companies and research organizations. The loudness meters were evaluated in their ability to predict the results of an extensive database derived from a series of formal subjective tests conducted at five test sites around the world. The performance of the various loudness meters is compared and rated using several newly proposed metrics. Several basic objective loudness measures were also evaluated.
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