MUSHRA

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MUSHRA stands for MUltiple Stimuli with Hidden Reference and Anchor and is a methodology for subjective evaluation. It is defined by ITU-R recommendation BS.1534-1. The main advantage over the Mean Opinion Score (MOS) methodology is that it requires fewer participants to obtain statistically significant results. In MUSHRA, the listener is presented with the reference (labeled as such), a certain number of test samples, a hidden version of the reference and one or more anchors. The recommendation specifies that one anchor must be a 3.5 kHz low-pass version of the reference. The purpose of the anchor(s) is to make the scale be closer to an "absolute scale", making sure that minor artefacts are not rated as having very bad quality.