Internet voice playout scheduling for integrated delay and error concealment with time-scale modification
Packet delay and loss are two essential problems to real-time voice transmission over the Internet. Some effort has been involved in packet-level delay jitter concealment and error control. To minimize the impact of packet delay jitter dropping at the receiver, a packet-based Synchronized OverLap-and-Add (SOLA) algorithm was proposed in [3] to play out packets adaptively. By employing the forward error correction (FEC) for network loss recovery, this paper further extends the applicability of audio time-scale modification to an integrated delay/error concealment Performance improvement of the proposed adaptive playout is provided by comparing with the silenced-based, FEC-integrated adaptive playout. Overhead of the proposed concealment is discussed in terms of delay and complexity. We also investigate the impact of stretching-ratio transition on the perceived quality.