| With the popularization of fiber transmitting technology and the development of multimedia technology, the real-time transmitting of digital encoding video signals with fiber has become an important research field of Long Distance Video Supervisory System. In addition, media processor, which is very powerful and convenient to use in multimedia applications,can satisfied the need of encoding digital video optical fiber transmitting technology. In the paper, a new digital video optical fiber transmission system is adopted here and the hardware implementation is designed for the DSP system to realize the encoding of video which is going to be transmitted in fiber.TMS320DM642 is a new media processor provided by Texas Instrument Company. Integrated with C64x DSP core, audio and video peripheral interface and network module, it offers ideal solutions for high performance multimedia applications. When working at a clock rate of 720MHz, DM642 can execute 5760 Milionis instructions per second.DM642 can be used to realize compression or decompression algorithm for many video standards.The methods and experiments in the paper are mainly as follows:1. According to the character of digital video transmission, firstly a digital video optical fiber system is designed in the paper. The system adopts SCM multiplexing technique to transmit distributed access video signals in optical fiber.2. In the paper, we can realize the MPEG2 encoder and decoder of video based on media processor TMS320DM642.And then the hardware platform is designed as well as the choice of chips and parameters. According to the hardware design of each part of the whole platform, this paper discusses about the importance of High Speed PCB design and the details provide a reasoned PCB design to the platform.3. After the design of hardware platform, the code developing environment CCS is used to test whether the platform realize the function of MPEG2 decoder an encoder of video and satisfy the meet of the task. |
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