Robust critical data recovery for MPEG-4 AAC encoded bitstreams

Ruijing Hu (1) , Xucen Huang (1) , Michel Kieffer (1, 2) , Olivier Derrien (3) , Pierre Duhamel (1)

1 L2S - Laboratoire des signaux et systèmes
2 LTCI - Laboratoire Traitement et Communication de l'Information
3 LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]

This paper presents a bandwidth-efficient method for improved decoding of critical data generated by the MPEG-4 AAC audio coder when encoded bitstreams are transmitted over noisy channels. The critical data of each encoded frame is estimated using the redundancy due to the correlation between successive frame headers and using an optional CRC as an error-correcting code. Simulation results for an AWGN channel show a substantial link budget improvement (more than 5 dB) compared to a classical hard-decoding method. Once critical data are efficiently estimated, the work of previously proposed joint source-channel decoding techniques to recover the remaining parts of the MPEG4 AAC frames is significantly facilitated.

Domaines: Traitement du signal et de l'image [eess.SP]; Réseaux et télécommunications [cs.NI]; Traitement du signal et de l'image [eess.SP]

Ruijing Hu, Xucen Huang, Michel Kieffer, Olivier Derrien, Pierre Duhamel. Robust critical data recovery for MPEG-4 AAC encoded bitstreams. International Conference on Acoustics, Speech, and Signal Processing, Mar 2010, Dallas, Texas, United States. pp.2358-2361, ⟨10.1109/ICASSP.2010.5495793⟩. ⟨hal-00549215⟩