PREDICTIVE CODING OF SPEECH USING ANALYSIS-BY-SYNTHESIS TECHNIQUES

This paper presents an overview of analysis-by-synthesis techniques used for low bit rate coding of speech signals. Analysis-by-synthesis procedures use linear predictors to remove the redundancies in the speech signal. The remaining difference signal is not quantized directly, but is replaced by an excitation signa1 that can be represented with a low number of bits. The selection of this signal is typically based on an exhaustive search procedure, in which for each prototype excitation the corresponding speech signal is constructed. The average mean-squared error between the original and the reconstructed signal is used as a criterion to determine the best choice of Lhe excitation signal. In this paper, different excitation signals are discussed, as well as procedures for determining the various coder parametsrs. In addition, the paper discusses some recently proposed speech coding standards, which are based on analysis-by-synthesis techniques.

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