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The novel ideas for lossless audio coding analyzed in the paper are linked with forward predictor adaptation, and concern optimization of predictors on the basis of zero-order entropy and MMAE criterions, and context sound coding. Direct use of the former criterion is linked with exponential growth of optimization procedure, hence, a suboptimal algorithm having polynomial complexity is proposed. It is shown that on average the new types of predictors are better than those obtained by MMSE technique. Then, a two-context only system is on average better than a single predictor one. It also appears that 7-bit precision of PARCOR coefficients in the MPEG-4 ALS standard is insufficient for some recordings and predictor length, and that for very long frames coding results improve with the predictor rank practically in unlimited way.

Novel Ideas for Lossless Audio Coding