Design Of And Research On DSP-Based Video And Audio Processing System

With the rapid development and wide application of multimedia technology,computer technology, network technology, it is more and more important to process thevideo and audio information. Depending on the application area and implementation ofdifferent functions, it has become an important method for designing a video and audioprocessing system to develop a common video and audio processing platform and makefurther development of functions on the platform.In this paper, a video and audio processing system based on TI company’smultimedia digital signal processor TMS320DM642was researched and developed, thesystem implements two functions: First, it can transform the collected PAL standardanalog video images into digital YUV4:2:2format, then for which make compressioncoding, finally display and storage the video images; Second, it can support two audioinput methods which are line input and microphone input, then make AD conversionand processing for the audio, finally, play and storage the audio.The main content of the paper contains: it describes the internal structure andperipherals of the chip TMS320DM642, according to the design requirements of a videoand audio processing platform, the hardware design of the video and audio processingsystem based on TMS320DM642is completed, and the detailed design of each moduleis described; Upon completion of the hardware system design, according to the specificrequirements of system functions, the initialization of DSP and the modules is discussedin detail; the specific discussion of the self-starting and the bootloader and how togenerate.hex file which can be stored in Flash is made; A brief description of theimplementation process of system function is made; Finally, according to thedevelopment of own hardware system, a brief description about the relevant technicalspecifications and precautions of the multi-layer printed circuit board layout and routingis made.Finally, the paper summarizes some gains and losses for the system, and givessome suggestions for further perfecting the system.