A virtual conferencing system, which couples two separated rooms as if they were a single virtual space connected by an open window, can be implemented in a variety of ways. This study examines the performance of four approaches using the metric of intelligibility with multiple simultaneous talks as the criterion. The problem is constrained by the amount of computation required, limitations on channel capacity, reverberation in the source space, and the difficulty using beamforming to isolate talkers and reduce acoustics contamination. Many improvements were not linear once a threshold level of performance was achieved.
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