Design And Implementation On The Modules Of Controlling And Embedded Network Of The Digital Audio Equipment

In recent years, audio monitoring systems are developing rapidly in China. Digital audio monitoring systems play an important role in the area of broadcasting, and digital signals are also replacing the traditional analog signals gradually. Therefore, the monitoring technology based on embedded system application is becoming a hot topic for its wide application and enormous market potential.A digital audio monitoring system based on series of Blackfin DSP chips for automatic monitoring and switching of digital audio broadcasting transmitter is proposed. The system is applied to production and transmission of the audio radio program, monitoring of access multi-channel audio signal, monitoring of multi-channel signal of professional audio equipment application systems, and monitoring of multi-channel audio signal of professional sound engineering and so on.Firstly the development and the status of digital audio radio are introduced. The source of digital audio signals, the standard of digital audio interface, AES/EBU and its interface as well as other related basic theories are presented. Then the design details of this system hardware and software are given. Design of the system hardware includes two modules of the control board comprised of the control module and the embedded network module, the connections between the chips in detail and the main application of chip such as CS8420, DSP, CPLD, and LAN91C111. Design of the software includes the transplantation of TCP/IP stack and implementation of VDK-based application. Finally, work process and testing of this system are introduced.