Orion Hodson, Colin Perkins, and Vicky Hardman
Proceedings of the IEEE International Conference on Multimedia and Expo,
New York, NY, USA,
July 2000.
DOI:10.1109/ICME.2000.871096
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.
Download: icme2000.pdf