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Investigation on the perceived audio quality of Higher Order Ambisonics recordings with a reduced number of A-format audio channels

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This project examines the effect of the reduced number of A-format audio channels obtained from a spherical microphone array on the overall quality of the 1st and 3rd order Ambisonics. The listening experiment employed four test scenarios involving two recording environments and two microphone positions. The evaluation was carried out using MUSHRA methodology with additional implementation of the scene rotation. The results suggest potential degradation in the quality of the 3rd order Ambisonics when the number of A-format channels is reduced. That was found especially for the recordings made in a controlled environment. No effect of a reduced number of A-format channels was observed for the 1st order Ambisonics in any test scenario.

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