随着计算机和网络应用的普及，基于PC的多媒体视尖终端将具有非常广阔的发展前景，但是由于计算机运算速度的限制，目前还不能完全用软件来实现视频终端的编解码，鉴于这种状况，在对视频编解码算法特点做了详细分析的基础上，提出了一种软硬件相结合的视频终端设计思想，根据该思想设计的视频终端带有一个视频微处理器，它用来处理低级的编解码运算，如进行DCT／IDCT，ME／MC以及量化／反量化等，而C机则进行变长编码／变长解码，编码码流的组成与分离，复接／解复接等中高级任务的处理，这样，不仅充分发挥了软硬件的各自优势，使总体性能有了很大提高，而且提供了更多的功能，这种设计思想还为实现MPEG2编码器提供了一种更经济的途径。

With the popularity of the application of computer and network technology, there is a bright prospect for the multimedia video terminal embedded in PC. But because of the speed limit of current computer, this terminal could not be realized with software fully. According to this condition, we analyses the computation of video codec in detail, and present a design idea for multimedia terminal based on the cooperation of software and hardware. With this idea, a multimedia video terminal is designed with a video microprocessor which is used for low level codec computation, such as DCT/IDCT, ME/MC, and Quantization/Inverse Quantization ,and PC is used for processing medium and high level task such as VLC/VLD, the construction and deconstruction of coded stream . So it takes each advantage of them fully, and not only enhances the global performance greatly, but also provides more functions. This also indicates a more economic way for MPEG2 encoder realization too.