A Robust Packet Loss Recovery Scheme for Wideband Speech Codecs
In this paper, the use of Source-Controlled Channel Decoding (SCCD) was investigated in estimating parameter values of parametric wideband speech codecs subjected to noise and packet losses. The technique was applied to LP-based and sinusoidal transform-based wideband speech codecs assuming a first order Markov chain to model interframe parameter distribution. Fading and non-fading channels were considered with AWGN using BPSK at the bit level and specified Packet Loss Rates (PLR) at the packet level. An approximation of the 2-state Gilbert model was used in erasing packets.