G.729.1算法的改进与DSP全汇编优化设计  

G.729.1 algorithm improvement and DSP all assembly optimization design

作　　者：王春柳[1] 陈德宏[2] 申星海 

机构地区：[1]河海大学文天学院电气信息工程系,安徽马鞍山243031 [2]安徽工业大学电气与信息工程学院,安徽马鞍山243002

出　　处：《重庆邮电大学学报（自然科学版）》2016年第6期789-796,共8页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(61304066)~~

摘　　要：在G.729.1宽带语音编码算法中,时域混叠编码器的谱包络编码根据帧内子带的相关性,采用差分霍夫曼编码来减少编码的比特分配。针对相邻帧对应子带的谱包络存在相关性,给出了在原有谱包络编码模式的基础上,增加一种帧间对应子带差分霍夫曼编码的模式来进一步减少谱包络的编码比特数,从而提高合成语音的质量。由于G.729.1可以根据信道的特征随时调整编码速率以取得更好的宽带语音质量,这使得该编码算法具有很高的复杂度。为了能在数字信号处理器(digital signal processor,DSP)上实时实现G.729.1,结合TMS320VC5505数字信号处理器对G.729.1算法采用全汇编实现,并对汇编后的G.729.1代码做了进一步的汇编优化,优化后的G.729.1算法在保证了高质量语音输出的同时,提高了编码效率,实现了对语音信号的实时处理。In the wideband speech coding algorithm of G. 729. 1 standard,based on sub-band correlation of inter-frames,spectral envelope coding of time-domain aliasing cancellation encoder reduces allocation bits with the difference Huffman coding. Considering the sub-band correlation between adjacent frames,a difference Huffman coding mode in sub-band of adjacent frames is added on the foundation of the original spectral envelope coding mode,which further reduces spectral envelope of coded bits and improves the quality of synthesized speech. G. 729. 1 can adjust the coding rate according to the characteristics of channel at any time and can get a better wideband speech quality,which makes the encoding algorithm have a high complexity. Therefore,all assemble language based on TMS320VC5505 digital signal processor is adopted to the real-time implement of G. 729. 1 algorithm. And the further optimization is made for the assembly code of G. 729. 1.The optimized G. 729. 1 algorithm can ensure the high-quality synthesis speech,improve the coding efficiency and achieve the real-time processing of the speech signal.

关 键 词：宽带语音 G.729.1 谱包络编码 差分霍夫曼编码 汇编优化 

分 类 号：TN912.3[电子电信—通信与信息系统]