基于定点的LPC10-e解码算法实现

LPC10-e算法是在2.4kb/s低码率情况下较简单也效果相对较好的语音编解码算法,用于许多语音声码器。由于其较低的算法复杂度使得其需要的带宽及资源相对较小。而要在资源较为紧张的单片机上实现该算法并具有相当的算法精度,就需要解决基于定点的算法实现和相关的技术难点。本文着重讨论了LPC10-e解码算法在定点化实现过程中的关键技术以及解决的方法。实验结果表明了实现后的语音质量与原来的浮点实现相比,语音质量仍可以保持原来的水平。

Implementation of decode algorithm of LPC10-e based on fixed-point method

LPC10-e has relatively good quality of voice with a lower algorithm complexity especially in the low rate of 2.4 kb/s,which can be fit to low band network as its low algorithm complexity.In order to realize it to a MCU which has limited resources,it must solve the fixed-point algorithm and related technical problems.The key techniques in fixed-point algorithm are discussed in this paper.The experimental results show that the quality of voice after decoded by fixed-point algorithm has no major difference compared with that decoded by floating-point algorithm.