In audio quality evaluation, ITU-R BS.1534-1, commonly known as MUSHRA, is widely used for the subjective assessment of intermediate audio quality. Studies have identified limitations of the MUSHRA methodology [1][2], which can influence the robustness to biases and errors introduced during the testing process. Therefore ITU-R BS.1534 was revised to reduce the potential for introduction of systematic errors and biases in the resulting data. These modifications improve the validity and the reliability of data collected with the MUSHRA method. The main changes affect the post screening of listeners, the inclusion of a mandatory mid-range anchor, the number and length of test items as well as statistical analysis. In this paper the changes and reasons for modification are given.

Authors: Liebetrau, Judith; Nagel, Frederik; Zacharov, Nick; Watanabe, Kaoru; Colomes, Catherine; Crum, Poppy; Sporer, Thomas; Mason, Andrew
Affiliations: Fraunhofer IDMT, Ilmenau, Germany; Fraunhofer Institute for Integrated Circuits IIS, Erlangen, Germany; International Audio Laboratories, Erlangen, Germany; DELTA SenseLab, Iisalmi, Finland; NHK Science and Technology Research Labs., Setagaya-ku, Tokyo, Japan; Orange Labs, Cesson Sevigné, France; Dolby Laboratories, San Francisco, CA, USA; BBC Research and Development, London, UK(See document for exact affiliation information.)
AES Convention: 137 (October 2014) Paper Number: 9172
Publication Date: October 8, 2014
Subject: Perception

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