Based On Embedded Digital Audio Information Monitoring Software

In recent years, with the development of science and technology, digital radio and television services is also growing rapidly. However, opportunities and challenges coexist, the signal quality of the radio broadcast centers also has a higher standard and requirement. In view of this situation, this paper designs a monitoring system of digital audio signal based on AES/EBU interface standard user information bits. By inserting information code in the source signals to implement the audio content screening and real-time monitor the transmission path, effectively solve the fault for digital audio transmission path and the error caused by the content.This paper analyses the AES/EBU standard digital audio signal structure and transmission characteristics etc, proposes the insertion scheme based on user information bit identification code. The monitoring system is mainly composed of two parts:intelligent control part based on ARM microprocessor and signal processing part of codec based on FPGA. The main function of the system is sending the identification information codes of the main control board to the coding board based on FPGA for identification code insertion through the SPI communication, parsing the identification code after transmission at the receiver board, sending to the main control panel to display and comparison, providing a function for decoding audio monitoring at the same time.This paper has also introduced the software design of intelligent control part based on ARM microprocessor in detail. Firstly, we create a system software platform, including cross-compiler environment, U-Boot boot loader, Linux kernel and Linux file systems and other content; design and develop the device drivers of embedded Linux, including LCD backlight driver, display drivers, touch screen drivers and SPI communication, etc.; in parts of the system application, building Qt/E development environment, completed the development of a graphical user interface for digital audio information monitoring system.Finally, the paper analyzes the result of running the system, the system achieves the desired goal. This paper also proposes some deficiencies and suggestions.