LOW BIT RATE SPEECH CODING ALGORITHM AND ITS HARDWARE IMPLEMENTATION

通讯技术的迅速发展，要求语音通信能在保证质量的同时具有更低的码率。低码率语音编码采用了多种有效的语音信号处理技术，兼顾了传输码率与语音质量的要求，能在较低码率情况下获得较高质量的合成语音，因而在现代通信系统中得到广泛应用。 ITU-TG.729语音编码方案采用共轭结构代数码本激励线性预测技术，算法具有8Kbit/s的编码速率、较低的延迟和高编码语音质量，使得它在会议电视、数字综合业务网、网络多媒体通信和语音存储系统等领域得到应用，特别是在会议电视系统中,该算法成为了多种网络应用的语音编码部分标准。但是它的计算量和数据存储量都相对较大，实时实现有一定的难度。DSP技术的高速发展，为语音信号处理...As an important transmission part in multimedia communication system, speech coding technologies deserve more attention. Especially with the rapid development of telecommunication technology, low bit rate and high quality speech coding schemes are needed in order to save the limited frequency resource. In the mean time, some low rate efficient digital speech processing technology are used to solve...学位：理学硕士院系专业：计算机与信息工程学院电子工程系_无线电物理学号：20003000

The Implementation of ITU-T G·729 Speech CODEC Using DSP

详细分析了ITU TG·729CS ACELP语音编解码算法的原理,针对算法特征及DSP体系结构特点,提出了一些有效的优化措施,在TITMS320VC5410DSP平台上实现了该算法的实时编解码.该系统的实现可应用于数字语音存储和网络多媒体通信系统等领域.After studying the principle of ITU-T G·729 in detail, some optimized methods are presented according to the characters of the algorithm and DSP, which can reduce the calculation burden. Its implement scheme founded on the hardware system composed of DSP TMS320VC5410 is also presented. This design can be widely used in the digital voice storage system and network multimedia communication system

FPGA Implementation of Frequency Hopping Algorithm for Bluetooth

跳频是蓝牙使用的抑制干扰的关键技术。在简要介绍扩频技术的基础上,对蓝牙系统基带部分的跳频算法进行了详细分析,并用VHDL完成该算法的硬件描述。在Xilinx ISE开发环境下完成综合及后仿真,通过蓝牙标准提供的样本数据的测试验证,最后下载到Xilinx Virtex-Ⅱ器件上实现。该设计的实现可应用于蓝牙基带芯片的研发。Frequency hopping is the key technology used to suppress interference in Bluetooth system. Based on the simple introduction of spread spectrum technique, the analyzing on the frequency hopping of baseband in Bluetooth system and the implementation of this algorithm with VHDL are given . The synthesis and post simulation have also been done under the Xilinx ISE tools. Its correctness has been validated through the sample data which were given by the Bluetooth specification. Finally it was implemented in Xilinx Virtex-II successfully. This design can be used in the development of Bluetooth ASIC