Integrated delay and error concealment for Internet voice applications with time-scale modification

Fang Liu; JongWon Kim; C.-C. Jay Kuo

doi:10.1117/12.448219

12 November 2001 Integrated delay and error concealment for Internet voice applications with time-scale modification

Fang Liu, JongWon Kim, C.-C. Jay Kuo

Proceedings Volume 4518, Multimedia Systems and Applications IV; (2001) https://doi.org/10.1117/12.448219
Event: ITCom 2001: International Symposium on the Convergence of IT and Communications, 2001, Denver, CO, United States

Abstract

Packet delay and loss are two essential problems to the transmission of real-time voice over the best-effort Internet. Much effort has been involved in packet-level error control and delay jitter concealment. In our previous work, a time-scale modification of audio signal with per-packet adaptive playout algorithm is proposed to minimize the packet dropping at the receiver-end due to delay jitter. This work further extends the applicability of packet-based Synchronized OverLap-and-Add (SOLA) algorithm to an integrated delay/error concealment. Considering the timing relationship with the Forward Error Correction (FEC) parity-packet for loss recovery, the proposed adaptive playout algorithm estimates and adapts to packet loss as well as delay jitter. To enhance the playout quality, per-packet time-stretching factor is bounded by the content classification module, which classifies the audio signal into different categories. We also investigate the impact of stretching-ratio transition strategy to the perceived quality. To demonstrate the proposed adaptive playout, both analysis and performance evaluation is provided by comparing it to the silenced-based adaptive playout.

Citation Download Citation

Fang Liu, JongWon Kim, and C.-C. Jay Kuo "Integrated delay and error concealment for Internet voice applications with time-scale modification", Proc. SPIE 4518, Multimedia Systems and Applications IV, (12 November 2001); https://doi.org/10.1117/12.448219

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