<title>A quality comparison of preventive control schemes for media synchronization in voice and video communications</title>

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This paper assesses the media synchronization quality of preventive control schemes employed at media sources and media destinations for voice and video over a network. Preventive control is required to try to avoid asynchrony (i.e., out of synchronization). We here deal with two preventive control techniques employed at sources: Advancement of transmission timing of media units (MUs), each of which is the information unit for media synchronization (e.g., a video picture), with network delay estimation and temporal resolution control of video. We also handle three preventive control techniques employed at destinations: Change of buffering time with network delay estimation, preventive pausing, and preventive shortening of output duration. By experiment, we make a performance comparison among preventive control schemes which employ the preventive control techniques at sources and destinations. We also clarify the relations between subjective and objective assessment results.

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