一种基于G.729语音编码的改进算法  

An improved algorithm based on G.729 speech coding

作　　者：巫洪伟[1] 和应民[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《应用科技》2007年第4期16-19,共4页Applied Science and Technology

摘　　要：共轭代数码本激励线性预测(CS-ACELP)语音编码算法在8 kb/s速率上获得了比较理想的质量,是以10 ms为一短时语音帧作为处理对象.基于CS-ACELP语音编码算法,以20 ms为一语音帧,在编码器中引入脉冲散布技术,提出了一种使码速降低至4 kb/s的散布脉冲代数码本激励线性预测(PD-ACELP)编码算法.经仿真实验及主观听觉测试表明,这种算法的合成语音质量还是比较令人满意的.The quality of the conjugate-structure algebraic-code-excited linear-prediction （CS-ACELP） algorithm is fairly high at the bit-rate of 8 kb/s, which employs a 10 ms -short-time voice-frame as a processing object. On the basis of CS-ACELP algorithm, taking 20 ms-short-time as a voice-frame and using pulse-dispersion technique, a PD-ACELP algorithm is proposed that decreases the bit-rate to 4 kb/s. Both computer simulations and subjective hearing tests show that the synthetic speech quality of the coding algorithm is fairly satisfactory.

关 键 词：语音编码 线性预测 脉冲散布 码本搜索 

分 类 号：TN912.3[电子电信—通信与信息系统]