TMS320C5509的铁路通信语音实时系统设计
关键词 G.723.1 TMS320C5509 优化技术 语音编码
毕业设计说明书（论文）外文摘要
Title Real-time System Design of Railway Speech Communications Based on TMS320C5509
Abstract
Railway communication system plays a critical role in insuring the smooth operation
of the railway system. At the same time, the accurate recording of the voice item
during the communication of railway is of vital importance when affirm the
responsibilities and evidence against law is needed. The thesis design a real-time
recording system of speech communications, it takes the TMS320C5509 as the core
process unit, with G.723.1 dual rate speech algorithm for real-time compressing
of speech signal. The thesis focuses on analyzing the basic principle of codec
algorithm and reference C codes provided by ITU (International Telecommunications
Union). Combing with the hardware features of C5509, and a series of measures
on assemble optimization such as intrinsic functions, simplifying cycle, and allocating
memory space reasonable and so on. Finally, the operate efficiency is improved.
Keywords G.723.1 TMS320C5509 optimization techniques speech coding
目 次
1 绪论 . 1
1.1 引言 1
1.2 语音编码技术发展进程 1
1.2.1 国外发展现状 . 1
1.2.2 国内发展现状 . 3
1.2.3 语音编码的分类 .. 3
1.2.4 衡量语音编码性能的主要因素 .. 4
1.3 压缩算法的选择 6
1.4 主要工作和论文的内容安排 .. 6
2 系统项目设计方案 . 7
2.1 DSP芯片选型 .. 7
2.2 音频处理芯片 .. 8
2.3 语音编码的实现环境 .. 9
3 G.723.1算法分析 . 10
3.1 G.723.1编解码器 . 10
3.1.1 编码器接口特性 . 10
3.1.2 编码延时 . 10
3.1.3 G.723.1 编码流程图 11
3.1.4 G.723.1 解码器 . 12
3.2 G.723.1算法 C代码的分析 .. 13
3.2.1 主模块CODER.C 和Unti_LBC.C 13
3.2.2 LPC.C . 13
3.2.3 LSP.C . 14 本科毕业设计说明书（论文） 第 II 页 共 III页
3.2.4 EXC_LBC.C 14
3.2.5 BASOP.C .. 15
3.3 G.723.1算法仿真的软件工具 15
4 G.723.1算法在5509DSP 上的实现 .. 17