LPC与LSF系数转换的FPGA实现

Transformation of LPC and LSF based on FPGA

首先根据切比雪夫多项式求根法对LPC系数到LSF系数转换过程进行分析与推导,并给出了根据已知的LSF系数进行逆推求LPC系数迭代算法。然后,借助DDS算法原理实现查找表搜索求根,并在FPGA上实现了LSF系数到LPC系数转换。最后,给出了结论和分析。

Firstly, this article analyzes and educes the algorithm of transformation between LPC and LSF based on Chebyshev polynomial, and gives the inverse LPC coefficients iterative algorithm based on the known LSF coefficients. Secondly, this paper describes the design process for this algorithm on the FPGA platform, the design includes generation by using look-up table and some iterations for calculating coefficients. Finally, the results is presented and analyzed.