基于算术编码的AMR-WB参数变速率压缩  

AMR-WB Coding Parameters Compression Based on Adaptive Arithmetic Coding at Variable Rate

作　　者：解廷福[1] 杨果[1] 王晶[1] 

机构地区：[1]北京理工大学信息与电子学院,北京100081

出　　处：《电声技术》2013年第7期48-51,共4页Audio Engineering

基　　金：国家自然科学基金项目(61001188);国家科技重大专项(2010ZX03004-003-01)

摘　　要：提出了一种新颖的利用自适应算术编码对AMR-WB自适应多速率宽带语音编码标准中的ISP(Immit-tance Spectral Pairs)即导抗谱对系数、自适应码本索引、固定码本索引、码本增益进行压缩的方法。基于该方法进一步去除了AMR-WB编码标准中量化后参数的冗余,提高了压缩效率,并且得到了一种可变速率的编码算法。通过对大量语音和音频信号的测试,此方法在保证语音和音频效果及原始编码相同的情况下,在压缩效果上平均能节省5.97%的比特率。A novel technique of adaptive arithmetic coding of the quantized AMR -WB parameters including ISP, adaptive codebook index, algebraic codebook index and codebook gains is presented. A key feature of the new technique is the adoption of adaptive arithmetic coding. Based on the technique described in this paper, a high degree of adaptation and redun- dancy reduction are achieved. In addition, an efficient variable rate algorithm for AMR - WB is employed. For a set of audio samples used in the application;an average bit- rate saving of 5.97% is achieved while producing audio quality equal to that of the original AMR - WB.

关 键 词：自适应算术编码 AMR—WB编码参数 可变速率 

分 类 号：TN911[电子电信—通信与信息系统]