Abstract: In this paper，a fast algebraic codebook search method based on pulse replacement procedure is proposed in order to reduce the search complexity of the algebraic codebook search in AMR_WB.The proposed method employed the pulse combination not only lowers the computational complexity，but also ensures the speech quality.Experiments show that the proposed method yields speech quality equivalent to that by the depth-first tree search method that adopted in AMR_WB and the complexity is reduced by about 53.6%.

Key words: speech coding, AMR_WB, algebraic codebook search

摘要： 为降低AMR_WB中固定码本搜索算法的复杂度，在脉冲取代法的基础上提出了一种新的搜索算法，采用脉冲组合的方法，不仅降低了计算复杂度，而且保证了语音质量。实验结果表明，与AMR_WB采用的深度优先树搜索算法相比，在不影响语音编码质量的条件下，提出的快速码本搜索算法的复杂度降低了53.6%。

关键词: 语音编码, AMR_WB, 固定码本搜索