【作者】 杨杰；

【导师】 王逸林；

【作者基本信息】 哈尔滨工程大学 ， 水声工程， 2011， 硕士

【摘要】 目前世界各国在海洋的开发和海洋军事领域的投入逐年增加,水声通信技术的研究越来越受到人们的重视。作为传统通信手段的语音通信也成为水声通信中的应用热点。由于受到水声信道中可利用的工作频率低、带宽窄的限制,水声语音通信对语音数据的压缩提出了较高的要求。而水声信道具有的随机空变-时变-频变以及严重多途干扰等问题也使得水声通信中需要使用运算量较大的通信算法来克服这些问题。本文在OMAP-L137最小系统的基础上,设计并实现了针对水声语音通信的嵌入式信号处理硬件平台,采用AMBE-3000语音编解码芯片以实现对语音数据的实时压缩／解压缩。使用FPGA作为信号处理的协处理器,来辅助OMAP-L137完成复杂算法的运算。本文根据系统的设计要求,从功能、任务的角度将硬件系统分为系统供电模块、语音处理模块、嵌入式系统模块以及信号处理模块4部分。分模块详细阐述了主芯片的选型、电路原理图、PCB的设计以及硬件调试。完成了嵌入式开发环境的构建和嵌入式系统的移植,并编写了语音处理模块的调试程序,以及信号处理模块调试程序中的FPGA部分。最后测试了语音处理模块的压缩回放质量以及信号处理模块的Codec功能和数据通路。更多还原

【Abstract】 Since the marine development and the investment in maritime military being increased for countries around the world year by year, the research of underwater acoustic communication technique is being paid more and more attention. Therefore voice communication, as a traditional means of communication, becomes a hot spot in underwater acoustic communication application. Restricted by low-frequency available and narrow bandwidth in acoustic channels, acoustic voice communication puts forward a high demand on voice data compression. The underwater acoustic channel is space-time-frequency-vary-ing random and has serious multipath interference, which ask for a better computational algorithm with large computation to overcome such problems.Based on OMAP-L137 minimum system, the paper accomplishes the design and implementation of the embedded signal processing hardware platform for underwater acoustic voice communications. AMBE-3000 voice codec chip is being used to achieve real-time voice data compression/decompression. The FPGA, as a co-processor of signal processing, is being used to assist OMAP-L137 with complex computational algorithms.According to the system design requirements, the whole hardware system is divided into four parts with different functions, that is, the power module, voice processing module, embedded system module, and signal processing modules. The selection of the main chip, circuit schematics, PCB design and hardware debugging are discussed in detail as different modules. The paper completes the building of the embedded development environment and embedded systems migration, the programming of the voice processing module and signal processing module in the FPGA part for debugger. Finally, the compression playback quality in voice processing module, functions of the Codec and data path in signal processing module in signal processing module are being tested.更多还原