ITU-R BS.1770 has become the standard for loudness measurement in broadcasting. The measurement algorithm is equally adapted to 5.1 channel audio signals as it to a 2-channel downmix. Due to the manner by which the channels are summed, loudness differences can occur between the 5.1 channel signal and that of the stereo downmix. These differences are dependent on the inter-channel characteristics of the 5-channel mix. This engineering brief will outline the differences that can occur with different signals and provide data using real-world broadcast signals.
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