Clock Synchronization for Interactive Music Systems

Publication Type  Conference Paper
Year of Publication  2004
Authors  Dannenberg, Roger
Conference Name  OSC Conference 2004
Conference Start Date  30/07/2004
Abstract  Timestamped events allow computer networks to avoid some of the problems of network latency. Events are computed and delivered early to compensate for latency. Events are then scheduled using timestamps to compensate for variations in latency. This model assumes significant network latency, yet it relies on accurate local clocks. The problem of clock synchronization is to maintain a shared notion of global time with only local clocks and normal network communication. I will describe the typical drift properties of computer clocks (including digital audio sample clocks) and then describe several clock synchronization systems. While clock synchronization can be a low-level operating system facility, it is not difficult to build an application-layer clock synchronization facility on top of a communication mechanism such as OSC. I will describe how clock synchronization is integrated with audio synthesis and event scheduling in Aura.
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