Patent ID: 8280728

Claim:
A system for replacing a portion of an audio signal that is deemed lost in a sub-band predictive coder, comprising: a first excitation extrapolator implemented in at least one processor and configured to generate a first sub-band extrapolated excitation signal based on a first sub-band excitation signal associated with one or more previously-received portions of the audio signal only when a current portion of the audio signal is deemed lost; a second excitation extrapolator configured to generate a second sub-band extrapolated excitation signal based on a second sub-band excitation signal associated with one or more previously-received portions of the audio signal only when the current portion of the audio signal is deemed lost; a first synthesis filter configured to filter the first sub-band extrapolated excitation signal to generate a synthesized first sub-band audio signal only when the current portion of the audio signal is deemed lost; a second synthesis filter configured to filter the second sub-band extrapolated excitation signal to generate a synthesized second sub-band audio signal only when the current portion of the audio signal is deemed lost; and a synthesis filter bank configured to combine at least the synthesized first sub-band audio signal and the synthesized second sub-band audio signal to generate a full-band output audio signal corresponding to the portion of the audio signal that is deemed lost.