MPEG2 video and audio codec board set for a personal computer

Abstract

This paper describes MPEG2 video and audio CODER and DECODER boards and a set of dedi cated CODEC chips which are the key components of these boards. MPEG2 is the internat.ional standard for moving picture coding algorithms and is expected to be applied t.o various fields because of its high image quality. The design policy has been decided based on intensive investigations of potential applications and popularization of video com munication. From this view point, it is very efficient and important to implement an MPEG2 CODEC system on a personal computer (PC) platform. Since a short delay is particularly important for real-time applications such as teleconferencing, SP@ML has been adopted. In this case, the number of coding operations is reduced, but our simula tion results show that the picture quality is almost same as that of MP@ML. Non-real-time operation is also made pos sible so that application to interactive editing of video se quences can be achieved. Moreover, a considerable amount of processing is reduced by a hierarchical search algorithm. A nonlinear pre-filter is used to remove the noise included in the input video signal. Our prototype boards have been designed as PC/AT extension boards. The typical frame size is 720x480 pixels, and its rate is 30 frame per sec ond. The maximum bit rate of the compressed data is 15 Mbit/sec. BackgroundRecently, the demand has been increasing for the im plementation of video CODECs required for various appli cations such as video communication, broadcasting, and storage media use. In particular, the high-quality imple mentation of some key Multimedia technologies, for ex ample video CODEC technology and network technology, has come into strong demand. From this viewpoint, the MPEG2 standard video CODEC holds a prominent place in the world because the MPEG2 standard targets many applications in many fi elds including broadcasting, com munication, and storage media applications.An MPEG2 standard video CO DEC system is imple mented for high qua. lit.y video cOfnTTlIIIlicni.ion. Tn add ition , application is considered to other related areas, e.g., storage media application for video communication recording.Another issue to be discussed is the platform. Presently, PCs have come into wide use. It is very efficient and impor tant for popularizing video communication to implement 0-7803-2509-5/95 US$4.00 © 1995 IEEE 483 an MPEG2 standard video CODEC on a PC. In particu lar, PC/AT compatible machines seem to have taken the largest share in the world market. Thus, because of this popularity the MPEG2 video CO DEC system should be directly connected to the PC/AT platform as an example of our CODEC board set.2 Applications and RequirementsThe application targets of our research concerning video communication are vidleo telephones, video conferencing, and video on demand on a PC platform. These applications have many uses such as in the home, not only as a simple video telephone but as a home theater or as a way to obtain electronic news. Other uses in a public setting take th...

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