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Traditional broadcasting system to send analog audio signals , anti-interference ability is relatively weak , as the distance increases , will inevitably lead to the attenuation of the signal , the decline in the quality of the audio signal , while the construction and maintenance more difficult . With the development of Internet technology and digital audio streaming technology , the transmission and processing of the audio signal to digital gradually changes. Ethernet - based audio broadcast using digital technology transfer audio signal , you can achieve real-time on-demand multiple partitions broadcast , to avoid the shortcomings of traditional audio broadcast transmit multi- channel audio signals required laying Multi-line , but also has a good reliability , stability , low distortion , and easy to install wiring , etc. , has a broad development and application prospect . In this paper, digital audio and mature network technology , Ethernet interconnection FPGA-based embedded systems , to receive Ethernet from the digital voice signal webcasts . The main work of this paper are as follows: PowerPC405 hard-core processor and FPGA chip technology first , and analysis of network audio broadcasting system function , and then using the EDK tools , completed in Virter-II Pro PowerPC 405 hard -core processor embedded and generate the peripheral bus interface , RS232 interface , and build audio decoder interface IP core through the IPIF in the bus system , and use the EDK development tools provide IP core resources to add Ethernet interface IP core , and finally connect all of the components , the design is complete FPGA embedded system hardware platform . Configuration, software platform Xilkernel system to Complete the LwIP protocol stack on the Xilkernel achieve design platform device driver , and network digital audio broadcasting transmission protocol , from the completion of the task , data structures and other aspects the Xilkernel operating system under the program design . Finally , through the commissioning of the system , the system reaches the actual requirements , the completion of the intended target .
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