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Engineering Brief

The Effect of Downmixing on Measured Loudness

Authors: Norcross, Scott G.; Lavoie, Michel C.

AES Convention 131 · Paper 38 · October 2011

Abstract

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.

Details

Published in
AES Convention 131
AES Convention
131
Paper number
38
Publication date
October 6, 2011
Session subject
Perception
Affiliation
Communications Research Center (See document for exact affiliation information.)
Type
Engineering Brief