In this paper, we propose a new algorithm for measuring the loudness levels of broadcast content. It is called the High Efficiency Loudness Model (HELM) and it aims to provide robust measurement of programs of any genre, style and format, including stereo and multichannel audio 5.1 surround sound. HELM was designed taking into account the typical conditions of the home listening environment and it is therefore particularly good at meeting the needs of broadcast content users. While providing a very efficient assessment of typical generic programs, it also successfully approaches some issues that arise when assessing unusual content such as programs heavily based on bass frequencies, wide loudness range programs and multi-channel programs as opposed to stereo ones. This paper details the structure of HELM, including its channel-specific frequency weighting and recursive gating implementation. Finally, we present the results of a mean opinion score (MOS) subjective test that demonstrates the effectiveness of the proposed method.
Travaglini, Alessandro; Alemanno, Andrea; Uncini, Aurelio
Affiliations: FOX Interntional Channels Italy, Rome, Italy; Università La Sapienza, Rome, Italy(See document for exact affiliation information.)
AES Convention: 132 (April 2012) Paper Number: 8612
Publication Date: April 26, 2012
Subject: Listening Tests
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