Research And Implementation Of Cable HDTV STB Based On TMS320DM6446

As the coming of Beijing Olympics, the development of digital TV will accelerate in China. Digital TV in China will step into a period of fast development. Cable HDTV STB can process both SD signal and HD signal. So, in this period, the research on HDTV STB is important both in practical application and in farther development of digital TV.In this project, a solution of realizing a completely programmable HDTV STB based on a single media processor is presented. This solution is highly flexible and can be used in a wide range of applications.TMS320DM6446 media processor is used as core processor in the solution. TMS320DM6446 is the first products based on DaVinci technology released by Texas Instruments (TI). It represents a latest level digital media field.The whole task of the project includes designing a hardware platform and developing involved software. This paper discusses designing the hardware platform and developing HD video decoding software. The hardware implementation of cable TV signal input, HD/SD video displaying, audio playing, storage of TV program and infrared remote-control has been resolved. The whole hardware platform is modularized and is highly flexible. Besides, this system can also act as a video capture and video monitor system. Based on a signal processing layer module provided by TI, HD video decoding software has been completed according to DM6446 software architecture using MPEG-2 video coding standard. However, it can not fulfill the real-time requirement for the limitation of its signal processing layer module's optimization level. In this situation, realizing a high-level optimization signal processing layer module is necessary. A signal processing layer module has been realized. And many methods have been adapted to optimize this module. Till now, this module can decode 12 frames of 1920×1080 resolution per second or 28 frames of 1280×720 resolution per second.