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一种语音信号线谱对参数的优化算法

李娟娟1 俞一彪2 芮贤义3   

  1. 1 浙江海洋学院 机电工程学院，浙江 舟山 316004；

    2 苏州大学 电子信息学院，江苏 苏州 215021；

    3 上海交通大学 电子工程系， 上海 200030

  • 收稿日期:2006-06-24 修回日期:2006-10-30 出版日期:2007-05-31 发布日期:2007-05-31

Optimization Design for Efficient Computation of Line Spectrum Pairs

LI Juan－juan1, YU Yi－biao2, RUI Xian－yi3   

  1. 1 School of Mechanical and Electronic Engineering, Zhejiang Ocean University, Zhoushan 316004，China
    2 School of Electronic Information Engineering, Soochow University, Suzhou 215021，China
    3 Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai 200030，China
  • Received:2006-06-24 Revised:2006-10-30 Online:2007-05-31 Published:2007-05-31

被引次数

7

摘要： 提出了一种计算语音信号线谱对（LSP）参数的新算法。LSP参数可以通过求解一个与线性预测系数（LPC）相关的非线性N阶方程得到。首先利用埃特金迭代法求高阶非线性方程的一个实数根，再采用多项式综合除法降阶，最后运用费拉里算法求解一元四次方程的根，得到LSP系数。理论分析以及基于TMS320C5510 DSP的实验结果表明，本文提出的算法与目前的算法相比，不仅计算精度高、运算量小，完全可以实时处理。而且并可应用于G.729A标准等低码率实时语音传输系统。

关键词: 线谱对参数, 线性预测系数, 实时处理

Abstract: This paper proposes a new algorithm APF for calculating line spectrum pairs (LSP) of speech signal. LSP parameters can be obtained by solving an N-order non-linear equation relating to the linear predictive coding (LPC) coefficients. First, one root of the N-order nonlinear equation is derived with the Aitken iterative method. The order is then decreased with polynomial synthesis division. Finally the fourth-order equation is solved using the Ferrari’s solution. Theoretical analysis and experiments on TMS320C5510 DSP show that the proposed algorithm has high precision and low computation complexity, meeting the real-time processing requirement. The algorithm can be applied to low-bit real-time speech coding such as G.729A systems.

Key words: line spectrum pairs, linear predictive coding, real-time processing