In CELP coders, the past excitation signal used to build the adaptive codebook is known to be the main source of error propagation when a frame is lost. This paper presents a novel resynchronization technique using very low bit rate side information to correct the past excitation signal after a frame erasure, the novelty being that the correction is computed in a closed loop fashion, based on the actual error introduced by the concealment. Subjective test results show that this approach is a promising area for future research on frame loss recovery.
Bibliographic reference. Gournay, Philippe (2008): "Improved frame loss recovery using closed-loop estimation of very low bit rate side information", In INTERSPEECH-2008, 666-669.