Orion Hodson, Colin Perkins, and Vicky Hardman
Long lived audio streams, such as music broadcasts, and small
differences in clock rates lead to buffer underflow or overflow
events in receiving applications that manifest themselves as audible
interruptions. We present a low complexity algorithm for
detecting clock skew in network audio applications that function
with local clocks and in the absence of a synchronization mechanism.
A companion algorithm to perform skew compensation is
also presented. The compensation algorithm utilises the temporal
redundancy inherent in audio streams to make inaudible playout
adjustments. Both algorithms have been implemented in a simulator
and in a network audio application. They perform effectively
over the range of observed clock rate differences and beyond.
In Proceedings of the IEEE International Conference on Multimedia and Expo
Publisher IEEE Computer Society
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