Techniques for generating multichannel audio from stereo audio signals are supposed to\nenhance and extend the listening experience of the listener. To assess the quality of such upmix\nalgorithms, subjective evaluations have been carried out. In this paper, we propose an objective\nevaluation test for stereo-to-multichannel upmix algorithms. Based on defined objective criteria and\nspecial test signals, an objective comparative evaluation is enabled in order to obtain a quantifiable\nmeasure for the quality of stereo-to-multi channel up mix algorithms. Therefore, the basic functional\nprinciple of the evaluation test is demonstrated, and it is illustrated how possible results can be\nvisualized. In addition, the proposed issues are introduced for the optimization of upmix algorithms\nand also for the clarification and illustration of the impacts and influences of different modes\nand parameters.
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