Design And Implementation Of Network Digital Audio Broadcasting Terminal Based On ARM Cortex-M3

The development of embedded and networks technology have brought great impact on thetraditional audio processing transmission. The traditional analogue audio broadcast technologywill be replaced by the network digital audio broadcasting technique gradually. Low cost, lowpower, small size, flexible embedded systems has become the development trend of digital audionetwork broadcasting system.In this paper, according to the network digital audio broadcasting system applicationrequirements, a design of network digital audio broadcasting terminal based on embedded systemdesign was proposed. This terminal is based on LM3S9B96ARM Cortex-M3-basedmicrocontroller, this paper design the main processing module, external storage module, audiomodule, network interface module and power module，and realized the hardware platform designof network digital audio broadcasting terminal.This paper presents a design scheme of terminal driver based on SafeRTOS real-timeoperating system. On the basis of the reference Real-time Transport Protocol (RTP) and Real-timeTransport Control Protocol (RTCP), designed for network digital audio broadcasting system of thenetwork transport protocol based on UDP protocol to solve real time broadcast data transmissionand reliability issues. Completed audio data transmission program and broadcast program designbased on the embedded TCP/IP protocol stack LwIP.Finally, to ensure network digital audio broadcasting terminal in line with the industrializationrequirement, this paper test driver，audio performance and functionality. The testing resultindicates that the system is with a lot of advantages compared with tradition broadcast system, thesystem basically fulfills the requirement of design.