Packet loss concealment for sub-band predictive coding based on extrapolation of sub-band audio waveforms

A system, comprising:

• a decoder configured to decode one or more received frames in a series of encoded frames to generate a portion of a full-band audio signal corresponding to the one or more received frames, wherein decoding the one or more received frames comprises generating a first-sub band decoded audio signal, generating a second sub-band decoded audio signal, and combining at least the first-sub band decoded audio signal and the second sub-band decoded audio signal;
• a first sub-band replacement audio signal generator configured to store the first sub-band decoded audio signal and to generate a first sub-band replacement audio signal based on the stored first sub-band decoded audio signal if a frame in the series of encoded frames is deemed lost;
• a second sub-band replacement audio signal generator configured to store the second sub-band decoded audio signal and to generate a second sub-band replacement audio signal based on the stored second sub-band decoded audio signal if the frame in the series of encoded frames is deemed lost;
• and
• a synthesis filter bank configured to combine the first sub-band replacement audio signal and the second sub-band replacement audio signal to generate a portion of the full-band audio signal corresponding to the frame in the series of encoded frames that is deemed lost.

A computer program product comprising a computer-readable storage device having computer program logic recorded thereon for enabling a processor to generate a full-band audio signal based on a series of encoded frames, the computer program logic comprising:

• first computer program logic executable by the processor to decode one or more received frames in the series of encoded frames to generate a portion of the full-band audio signal corresponding to the one or more received frames, wherein the first computer program logic comprises
• computer program logic executable by the processor to generate a first-sub band decoded audio signal,
• computer program logic executable by the processor to generate a second sub-band decoded audio signal, and
• computer program logic executable by the processor to combine at least the first-sub band decoded audio signal and the second sub-band decoded audio signal;
• second computer program logic executable by the processor to store the first sub-band decoded audio signal and the second sub-band decoded audio signal;
• third computer program logic executable by the processor to generate a first sub-band replacement audio signal based on the stored first sub-band decoded audio signal responsive to a determination that a frame in the series of encoded frames is deemed lost;
• fourth computer program logic executable by the processor to generate a second sub-band replacement audio signal based on the stored second sub-band decoded audio signal responsive to the determination that the frame in the series of encoded frames is deemed lost;
• and
• fifth computer program logic executable by the processor to combine the first sub-band replacement audio signal and the second sub-band replacement audio signal to generate a portion of the full-band audio signal corresponding to the frame in the series of encoded frames that is deemed lost.