网格编码量化在G.719音频编码器中的应用  

Application of Trellis Coded Quantization in G.719 Audio Codec

作　　者：王迪[1] 赵胜辉[1] 赵情恩 翟迎灿 王迎雪[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》2015年第9期67-70,共4页Audio Engineering

摘　　要：网格编码量化(TCQ)借鉴了网格编码调制(TCM)中的信号集合扩展、信号集合划分和网格状态转移的思想,具有较好的量化性能,且复杂度适中。将TCQ应用到G.719音频编码器中,提出了一种MDCT系数的标量量化方案。实验结果表明,与G.719相比,该方案不仅降低了计算复杂度,而且其重建音频质量在64 kbit/s以上速率不低于G.719音频编码器。Trellis coded quantization （TCQ）, which draws on the ideas of signal set expansion, set partitioning and grid status transfer in trellis coded modulation（TCM） , achieves good quantization performance and moderate complexity. TCQ is applied to G. 719 audio codee and a scalar quantization scheme for the MDCT coefficients is proposed. The experimental resuits show that the proposed scheme not only reduces the codec complexity,but also obtains a not- less- than- G. 719 reconstructed audio quality for the coding rates above 64 kbit/s.

关 键 词：G.719 低复杂度 网格编码量化 

分 类 号：TN912.3[电子电信—通信与信息系统]