Comparison of Receiver-Based Concealment and Multiple-Description Coding in an 802.11-Based Wireless Multicast Audio Distribution Network

摘要

Aspects of a study of different methods to mitigate the impact of packet loss in a wireless distribution network on the subjective quality of compressed high-fidelity audio are presented. The system was simulated in Matlab based on parameters of an 802. 11a WLAN in multicast mode and the Vorbis codec. To aid in the selection of the most appropriate packet loss concealment strategy not only the additional bandwidth, the processing requirements, or the latency need to be considered. One important differentiating factor is the perceived subjective audio quality. Therefore an accurate estimate of the subsequent audio quality is required. Several simulation-based methods using psychoacoustic models of the human hearing system to quantify subjective audio quality are compared.