By using Internet Protocol (IP) interconnections for both audio/video (A/V) media movement and control, personal computers and A/V devices can seamlessly interact. This allows a variety of previously difficult scenarios—such as whole house audio—to be easily implemented. However, the non-isosynchronous (not all running on one common clock) IP network design must be overcome. We describe a variety of techniques that can coordinate IP interconnected home A/V devices to sufficient accuracy so that speakers and displays can synchronously render common content. Both hardware and software techniques are described. Our software implementation achieves sufficient accuracy for multichannel synchronization and lip-sync. and would have the lowest implementation cost. Tests on different IP network technologies and load conditions demonstrate the software solution quality.
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