Algoritmos de busca em codificadores ACELP

AUTOR(ES)

Lucas de Melo Jorge Barbosa

DATA DE PUBLICAÇÃO

2002

RESUMO

This work presents a review of the code-excited linear predictive (CELP) voice coding scheme, and a detailed and structured study of the search algorithms for algebraic multipulse codebooks (ACELP). In addition to the study of the current algorithms, this work also proposes a new search method, named as position-sequential search. Throughout this work the search algorithms are described using a common notation and represented by pseudo-codes. The computational complexity and perceptual quality of the search algorithms have been measured by the use of the ITU-T G.729 and the ETSI GSM-AMR speech coding standards. The implementations showed that in comparison to standard search procedures the position-sequential search causes only a slight degradation in voice quality, whereas providing a significant reduction in computational complexity. In the sense of reducing the time spent in the search process, this work also analyzes the impact of the optimized implementation of search algorithms on the global performance of the coding process. This question arises in algorithm implementations in modern digital signal processors with a high level of parallelism

ASSUNTO(S)

codificador de voz microprocessadores sistemas de processamento da fala

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