一种基于ACELP语音编码的改进码本搜索方法

摘要

An efficient ACELP codebook search method based on two stage search is presented. At the first stage, a coarse codevector is sel ected by a fast sequential search, and at the second stage, the pulse replacemen t procedure is run to enhance the performance of selected codevector. Simulation s with various speech data show that the proposed mehtod reduces 77% codebook se arch load compared with the standard method.%针对ACELP码本全搜索算法的计算量大，当前硬件难以实现 的特 点，提出了一种改进的两级型码本搜索算法。第一级进行序列快速搜索得到码矢初估值，第 二级通过用脉冲替代处理来提高所选码矢的精度，并对不同的语音数据进行了试验。结果表 明在同样的语音质量下，与传统算法相比，新算法减少了约77%的计算量。