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Error Mitigation in MPEG-4 Audio Packet Communication Systems

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This paper investigates techniques for mitigating the effect of missing packets of MPEG-4 Advanced Audio Coding (AAC) data so as to minimize perceived audio degradation. Applications include streaming of AAC music files over the Internet and wireless packet data channels. A range of techniques are presented, but statistical interpolation in the time/frequency domain is found to be the the most effective. The novelty of the work is to use statistical interpolation techniques intended for time domain samples on the frequency domain coefficients. A means of complexity reduction is presented, after which the error mitigation is found to require on average 17% additional computation for a channel with 5% errors as compared to a clear channel. In an informal listening test, all subjects preferred this technique over a more simplistic technique of signal repetition, and for one signal item statistical interpolation was preferred to the original.

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