【作者】 沈阳；

【导师】 丁晓明；

【作者基本信息】 北京交通大学 ， 信号与信息处理， 2008， 硕士

【摘要】 2006年,ITU-T提出新一代语音编解码标准G.729.1。其码流速率可根据网络的实际状况有效利用带宽,进行自适应调整。随着相关技术的发展,G.729.1宽带语音压缩标准必将有着广阔的应用前景。论文的特色性工作是基于FPGA平台对G.729.1编解码算法给予IP核实现。为此,对于在软核方式的嵌入式系统实现上,进行了大量的研究和实验,率先通过了实时的G.729.1硬件工程,并总结出多种算法实现的经验,有利于下一步硬件实现工作的开展。本文的研究工作主要包括以下几个方面:1.剖析G.729.1编解码算法结构,以及对相关性能参数进行深入研究。完成了基于PC机的G.729.1性能测试平台,优化出一系列的测试向量,为该算法的嵌入式系统实现打下基础。2.按照可重用设计方法学中IP核设计准则,从系统级设计角度,完成了基于NiosⅡ的G.729.1编/解码器系统设计。3.充分利用SoPC技术的优势,从模块级设计角度,完成硬件加速模块的设计,并最终实现了G.729.1硬件解码器的实时工作。4.总结出现代DSP设计相比于传统DSP设计所具备的优势,得出相关结论,为G.729.1硬件解码器的实现给出了建设性意见。更多还原

【Abstract】 The wideband speech coder standard G.729.1 is suggested by ITU-T in 2006. Based on the condition of network, the bit-stream, which is transmitted by the G.729.1 encoder, may be variable.With the development of technology, more and more application about G.729.1 will be achievable.The characterized task of this paper is the IP core design for G.729.1 coder worked on FPGA platform. Therefor, more research and experiment has been carried out about embedded system with IP soft-core design. And a real-time G.729.1 coder has been come ture in a hardware project firstly. On the other hand, more work will be putted into practice in favor of the experience from IP core design of this paper.The valuable research fruits in this paper follow as:1. Analysis about the arithmetic framework and parameter of G.729.1 protocol is valuable, which is required in embedded system design. In order to collect and optimize test vector for embedded system research, a test application about G.7291 has been achieved on PC platform.2. According to the theory about IP core design in Reuse Methodology, the paper discusses the G.729.1 codec embedded system design based on NiosII CPU.3. The paper describes the real-time G.729.1 decoder firstly realized on FPGA platform. In this case, the IP core modules of arithmetic accelerating which is designed for G.729.1 coder are needed.4. It is summarized some superiorities on Modern DSP Techniques, which is compared with Tradition DSP Techniques. In addition, the conclusions will be the guidance of correlative wideband speech coder design.更多还原