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Error resilient coding is strongly demanded by voice communication over unreliable packet networks. In this paper, the authors propose a new multiple description scheme named distributed sub-frame interleaving, and employ this new scheme to create two novel multiple description codecs based on CELP. With introducing distributed sub-frame interleaving operated on two adjacent speech packets, parameters of LSP are interleaved into different descriptions while other parameters belong to different sub-frames are assigned in sub-frame-distributed principle. Moreover, parameter interpolation is adopted to restore the lost description without introducing any extra delay at the decoder.
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