Joint source/channel decoding of scalefactors in MPEG-AAC encoded bitstreams

Abstract : This paper describes a bandwidth-efficient method for improved decoding of MPEG-AAC bitstreams when the encoded data are transmitted over a noisy channel. Assuming that the critical part (headers) of each frame has been correctly received, we apply a soft-decoding method to reconstruct the scalefactors, which represent a highly noise-sensitive part of the bitstream. The damaged spectral data are reconstructed using an intra-frame error concealment method. Two methods for soft decoding of scalefactors are described: blind mode and informed mode. In the latter, a very small amount of additional data is included in the bitstream. At medium SNR, this method provides a significant improvement in perceptual signal quality compared to the classical hard-decoding method.
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https://hal.archives-ouvertes.fr/hal-00467527
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Olivier Derrien, Michel Kieffer, Pierre Duhamel. Joint source/channel decoding of scalefactors in MPEG-AAC encoded bitstreams. EUSIPCO 2008, Aug 2008, Lausanne, Switzerland. CD-ROM (5 p.). ⟨hal-00467527⟩

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