In this study, two recently proposed objective measures of perceived loudness for monophonic audio signals are extended in several ways to deal with multichannel audio. The extensions range in complexity from a simple sum of the individual channels to the use of measured HRTFs to simulate the audio signals arriving at the ears. A database of subjective loudness matching data of multichannel audio is generated, and the performance of the various objective measures, including the particular multichannel measure recently adopted by the ITU-R, is compared against this data.
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