In the paper an automated method of subjective assessment of speech, music, image and video quality has been described. In the method the sound, image or video samples were randomized and paired in A-B sets and than presented to a group of listeners. On the base A-B results a preference matrix was calculated. The conversion from the preference matrix to a numerical scale was performed with accordance to Thurstone's V model of paired comparisons. The method was applied to evaluate an influence of various coding techniques on a quality of multimedia signals.
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