1. A system in a sub-band predictive decoder for generating a full-band audio signal based on a series of encoded frames, including: first logic configured to generate a replacement first sub-band audio signal corresponding to a lost frame in the series of encoded frames, the first logic comprising an excitation extrapolator configured to generate an extrapolated first sub-band excitation signal based on a first sub-band excitation signal associated with one or more previously-received frames in the series of encoded frames; a synthesis filter configured to filter the extrapolated first sub-band excitation signal to generate the replacement first sub-band audio signal; second logic configured to generate a replacement second sub-band audio signal corresponding to the lost frame; and a synthesis filter bank configured to combine at least the replacement first sub-band audio signal and the replacement second sub-band audio signal to generate a portion of the full-band audio signal corresponding to the lost frame.