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A b s t r a c tThe application of Algebraic Code Excited Linear Prediction (ACELP) coding to wideband speech is presented. In wideband coding, a very large excitation codebook is required in order to obtain high quality speech. Ordinary CELP algorithms fail to accomodate such large codebooks due to the excessive coding complexity. In ACELP, however, an algebraic codebook with 20 bit address can be used, without any storage requirements, and more importantly, with a very efficient search procedure which allows for real-time implementation. A focused search strategy is used in which a very small portion of the codebook is searched, yet with performance very close t o that of full search. High quality speech was obtained a t bit rates below 13 kb/s.

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