Design Of Underwater Voice Communication Hardware System Based On OMAP

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.