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.
This paper assesses the media synchronization quality of preventive control schemes employed at sources for stored video and voice over a network. The preventive control techniques are 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) with network delay estimation and temporal resolution control of video. By experiment, we make a performance comparison among preventive control schemes which employ one or two of the preventive control techniques. Experimental results show that a scheme which exerts the advancement of transmission timing together with the temporal resolution control is the most effective in terms of the media synchronization quality.
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