6.6 kbit/s 小波激励线性预测语音编译码器  

Wavelet excited linear predictive speech codec of 6.6 kbit/s

作　　者：艾红梅 杨行峻[1] 

机构地区：[1]清华大学电子工程系

出　　处：《清华大学学报（自然科学版）》1997年第10期12-15,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"八五"科技攻关项目

摘　　要：针对码本激励线性预测编码（ＣＥＬＰ），将小波变换运用于长时基音预测后的二次残差信号，提出了小波激励线性预测（ＷＥＬＰ）技术，大大降低了语音编码的复杂度。在保持相同合成音质的情况下，可使码速率为６．６ｋｂｉｔ／ｓ的ＷＥＬＰ的编码速度较之相应的ＣＥＬＰ提高一倍。在此基础上，给出了用两片ＡＤＳＰ２１８１芯片实现的６．６ｋｂｉｔ／ｓＷＥＬＰ语音编译码器的定点实时实现系统，并对该系统作了性能测试和语音质量评测，表明了该系统的良好特性。With the application of wavelet transform on the residual after long term prediction in codebook excited linear predictive (CELP) coding, a new method for lower bit rate speech coding wavelet excited linear predictive (WELP) coding is presented, which highly reduces the coding complexity. With the same quality of synthesized speech for 6.6 kbit/s speech coder, WELP can increase the coding speed twice than that of CELP. A 6.6 kbit/s WELP speech coder/decoder real time realization hardware system is discussed. With two ADSP2181 chips and fixed point algorithms, the system shows high performance while its synthesized speech quality is good.

关 键 词：小波激励 线性预测 码本激励 语音编码器 

分 类 号：TN912.32[电子电信—通信与信息系统]