嵌入式和网络技术的飞速发展，给传统的音频处理和传输领域带来了极大的冲击。传统的模拟音频广播技术将逐步被基于以太网络传输的数字音频网络广播技术所取代。采用低成本、低功耗、体积小、应用灵活的嵌入式系统成为了数字音频网络广播系统的发展趋势。 本文针对数字音频网络广播系统的应用需求，提出了一种基于嵌入式系统的数字音频网络广播终端的设计方案。本终端以基于ARM Cortex-M3内核的微处理器LM3S9B96为核心，设计了主处理模块、外部存储模块、音频模块、网络接口模块和电源模块，实现了数字音频网络广播终端的硬件平台设计。 本文提出了基于SafeRTOS实时操作系统的终端驱动程序实现方案。在参考实时传输协议(RTP)及实时传输控制协议(RTCP)的基础上，设计了基于UDP协议的适合数字音频网络广播的网络传输协议，解决了广播数据传输的实时性和可靠性问题。完成了基于嵌入式TCP/IP协议栈LwIP的音频数据传输及播放程序的设计。 最后为确保数字音频网络广播终端符合工业化要求，对数字音频网络广播终端进行了驱动程序测试、音频性能指标测试和功能性测试。实验表明该系统同传统的广播系统相比，体现出了明显的优势，达到了设计要求。

The development of embedded and networks technology have brought great impact on the traditional audio processing transmission. The traditional analogue audio broadcast technology will be replaced by the network digital audio broadcasting technique gradually. Low cost, low power, small size, flexible embedded systems has become the development trend of digital audio network broadcasting system. In this paper, according to the network digital audio broadcasting system application requirements, a design of network digital audio broadcasting terminal based on embedded system design was proposed. This terminal is based on LM3S9B96 ARM Cortex-M3-based microcontroller, this paper design the main processing module, external storage module, audio module, network interface module and power module，and realized the hardware platform design of network digital audio broadcasting terminal. This paper presents a design scheme of terminal driver based on SafeRTOS real-time operating system. On the basis of the reference Real-time Transport Protocol (RTP) and Real-time Transport Control Protocol (RTCP), designed for network digital audio broadcasting system of the network transport protocol based on UDP protocol to solve real time broadcast data transmission and reliability issues. Completed audio data transmission program and broadcast program design based on the embedded TCP/IP protocol stack LwIP. Finally, to ensure network digital audio broadcasting terminal in line with the industrialization requirement, this paper test driver，audio performance and functionality. The testing result indicates that the system is with a lot of advantages compared with tradition broadcast system, the system basically fulfills the requirement of design.