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Stereo and Multichannel Loudness Perception and Metering

Much research has been conducted in recent years on loudness perception and metering. This has been motivated by an ITU-R effort to identify a loudness measure suitable for broadcast applications. The initial ITU-R effort focussed exclusively on mono signals, and a simple loudness meter based on a weighted energy sum [Leq(RLB)] was shown to perform best. In the present study, the work on loudness perception was extended to the stereo and multichannel cases. Formal subjective tests were conducted using typical broadcast material to derive a subjective database to evaluate the performance of new loudness meters. The results were used to examine the requirements for a loudness meter for mono, stereo and multichannel signals.

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