自适应密度脉冲—码激励线性预测编码器  

CELP coder with ADP excitation model

作　　者：鲍长春[1] 赵国谦[1] 

机构地区：[1]长春邮电学院电信工程系,长春130012

出　　处：《长春邮电学院学报》1993年第2期1-7,共7页Journal of Changchun Post and Telecommunication Institute

摘　　要：研究了一种激励矢量动态比特分配的方法。由于此种方法采用了ADP(自适应密度脉冲),使得激励矢量的比特分配具有充分的灵活性,从而改善了CELP(码激励线性预测)编码器的性能。该文具体讨论了ADP参数的确定,描述了具有ADP激励模型的CELP编码器,评估了ADP-CELP编码器用于合成汉语语音的性能。实验结果表明,在4.8kbps处,ADP-CELP编码器比CELP编码器的分段信噪比高大约2dB.A method that excitation vector is dynamic hit-allocation is researched in this paper. In this method an adaptive density pulse (ADP) is used, the bit-allocation to excitation has efficient flexibility. It can improve the performance of CELP coder. In this paper, the determination of the ADP parameters is dis--cussed, the CELP coder with the ADP (ADP-CELP) is described. The performance of the ADP-CELP to Chinese speech synthesis is evaluated. Experiment result indicates that the segment signal to noise ratio (at 4-8kbps) of ADP-CELP coder is 2dB higher than that of CELP coder.

关 键 词：语音编码 编码器 ADP CELP 

分 类 号：TN912.32[电子电信—通信与信息系统]