Robust audio transport using mAudio
Kåre Synnes, Peter Parnes, Dick Schefström · 1999
IP based groupware applications, such as net-based learning environments, rely on robust audio transport for efficient communication between users. This paper therefore gives an overview and an initial evaluation of how to achieve robust transport of real-time audio streams over Internet connections without service guarantees. Due to hardware jitter and network congestion these connections face loss, packet delay and delay variation. Audio streams are especially sensitive due their realtime characteristics, where the end result is degradation of the perceived quality. Packet loss can be repaired using receiveronly, sender-initiated or receiver-initiated techniques. Depending on the actual network condition, an optimal technique can be selected using adaptive behavior together with loss-recovery techniques in the applications. Studies have shown that loss rates up to 20% can be effectively repaired using fairly simple techniques. The paper gives initial results from subjectively evaluat...