MPLPC激励脉冲提取算法研究  

RESEARCH ON MPLPC EXCITED-PULSE ABSTRACTION ALGORITHM

作　　者：马震[1] 蒋保臣[2] 陶立慧[2] 

机构地区：[1]滨州学院计算机科学系,山东滨州256600 [2]山东大学威海分校信息工程学院,山东威海264209

出　　处：《计算机应用与软件》2007年第11期183-185,共3页Computer Applications and Software

摘　　要：原始的多脉冲激励线性预测编码(MPLPC)方案中,由于没有考虑余量信号波形中的多脉冲信息和声门脉冲的非平稳性,导致计算量较大而且编码速率较高。为了解决这些问题,提出了波形辅助的激励脉冲搜索和变个数MPLPC方法。首先,给出用于辅助搜索的中心削波的削波门限,以减少搜索范围;然后,利用语音激励的非平稳性,提出了每帧脉冲个数的确定方法,用Matlab对本方法进行了仿真,获得良好的合成语音质量,而且可以减少1kb/s的编码速率。In primal MPLPC, the multi-pulse information in residual signal waveform and the unstability of glottis pulse are omitted, which leads to a large quantity of computation and high coding rate. To solve these problems, the method of waveform-aided excited-pulse search and number-variable MPLPC is proposed. First, the threshold of center clipper is ascertained to reduce the search range. Then, the method of ascertaining the pulse number of each frame is discussed on the basis of the unstability of speech excitation. Through Matlab simulation, nice synthetic speech quality is achieved,and the coding rate is reduced by 1 kb/s.

关 键 词：可变个数 波形辅助 语音编码 多脉冲激励 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]