基于DSP改进的RPE-LTP语音编码算法的研究  

Research on improved RPE-LTP speech coding algorithm based on DSP

作　　者：何琴[1] 李小文[2] 

机构地区：[1]重庆邮电大学计算机科学与技术学院,重庆400065 [2]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2008年第6期659-662,共4页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：科技型中小企业技术创新基金(04C26215111366)

摘　　要：为了压缩语音信号的传输带宽,采用ADPCM方式改进了RPE-LTP语音编码算法的规则脉冲激励编码部分,使编码速率从13 kbit/s降为9 kbit/s。为减小编解码运算复杂度,提出了一种将改进的RPE-LTP算法在TMS320C55x DSP上实时实现的方法,对算法实行编译器级、C语言级和汇编级3级优化,使其在C55x上实时实现的速度达到5.63 MCPS(百万周期每秒)。实验结果证明改进后的算法仍然保持了很高的语音合成品质。In order to compress the transmission bandwidth of speech signal, the regular pulse excitation coding of RPE- LTP speech coding algorithm is optimized by using ADPCM to reduce the coding rate from 13kbit/s to 9kbit/s. The improved algorithm has been optimized to real-time implement on the TMS320C55x generation DSP by performing compilerlevel optimization, C language-level optimization and assembly-level optimization. The speed of the optimized RPE-LTP algorithm is 5.63 MCPS in TMS320C5510. Experimental results show that the optimized RPE-LTP algorithm has a high reconstructed speech quality.

关 键 词：ADPCM RPE—IJrrP DSP 优化 语音编码算法 数字信号处理 

分 类 号：TN911.2[电子电信—通信与信息系统]