The number of consumer home theatre systems with surround capabilities has increased heavily. Nonetheless, most audio content is still 2-channel stereo. Thus, to enjoy the advantages of their surround-systems for all types of content, consumers resort to systems that automatically create multi-channel sound from legacy sources ("blind up-mix"). While a number of algorithms are used today, there is no commonly accepted test methodology to evaluate their sonic performance. Standardized listening test procedures evaluate audio quality relative to an unimpaired reference as a ground truth and thus are not applicable to up-mix scenarios. In this paper a new listening test procedure is described which is designed to consistently assess the quality of up-mix (or down-mix) algorithms. First test results are presented.
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