摘要
介绍了AMR-NB与G.729A2种语音编码标准的特点和算法,并就其线性预测分析、基音搜索、代数码书搜索和增益量化4个方面技术进行了比较。在线性预测分析方面主要对2种算法的加窗、LSP量化与内插的不同进行了陈述;在基音搜索方面对开环和闭环基音搜索上的差异进行了分析,并且对代数码书结构和搜索算法及增益参数量化的差别进行了阐述。最后给出了2种编码标准的语音质量、计算复杂度、空间复杂度等性能测试结果。
The characteristics of AMR-NB and G.729A speech coding standards and their own algorithms are introduced, then 4 aspects of LP（Linear Prediction） analysis, pitch detection, searching of algebraic codebook and quantization of gains in both the standards are compared. In the LP analysis, the differences in the windows, the quantization and interpolation of LSP（Linear Spectral Pairs）are mainly described. In the comparison of pitch detection, the differences between open-loop and close-loop pitch detection of the two standards are analyzed. Besides, the differences in the structure of codebooks and searching algorithm as well as the quantization of gains are betrayed. Finally, the results of performance tests of speech quality, computational and space complexity of the two standards are given.
出处
《电声技术》
2009年第4期56-61,65,共7页
Audio Engineering
