Kiyotaka Ogawa

Architecture of MPEG-2 digital set-top-box for CATV VOD system

We describe an MPEG-2 compliant VOD (video on demand) terminal (e.g. set-top-box) developed for field trial purposes. The hardware architecture of the set-top-box is discussed with emphasis on the graphics system which integrates the MPEG-2 format video, computer graphics and NTSC analog format video. A key point in the implementation of this architecture is the development of a clock rate conversion circuit. The set-top-box contains a one-chip MPEG-2 decoder.

Development of a digital TV system for use in computer systems

The authors have developed a digital TV system and LSIs which are expected to act as a bridge between the computer-generated image and the TV picture. These LSIs make possible the development of a system that can display TV pictures and computer-generated images simultaneously on a personal computer or workstation monitors. This system is expected to play an important part in desktop video systems. The monitor of the personal computer displays the computer and TV images at the same time. >

Development and architecture of second generation 6 chip MUSE (HDTV) decoder

The architecture of a six-chip MUSE (HDTV) LSI family which decodes MUSE video and audio signals is presented. With this architecture, the number of components can be reduced to a fifth of former levels. Because entire MUSE functions were integrated entirely onto the chips, improvements of various functions can be made chip by chip, ensuring a long life span for the LSI family as a whole. >

Development of low operating voltage 2.5th generation MUSE (HDTV) chip set

In 1992 we developed a 2nd generation MUSE chip set containing more than 4.2 million transistors (five video chips and one audio chip). The chip set reduced the number of components to about 115, and power to about 113 compared with older first-generation chip sets. As a result, the cost of the HDTV (MUSE) receiver was cut by about 50%. But demand for even less expensive HDTV (MUSE) receivers is strong. We describe the development of a 2.5th generation MUSE chip set which through reduction of the operating voltages we succeeded in a 50% reduction in power consumption, and a 40% reduction in cost while maintaining compatibility with previous 2nd generation LSIs. >

Development and conditions of an HDTV multimedia system

The development of an HDTV (high-definition television) multimedia system for use in home information terminals is described. It displays multiple incompatible images, such as MUSE (multiple sub-Nyquist sampling encoding), NTSC (National Television System Committee), and CG (computer graphics), on the same screen at the same time. It records the created, processed, or displayed images. High-quality MUSE images can be converted to NTSC images and recorded on conventional VCRs. Display interfaces are provided for various display units used in personal computers and in the NTSC system. The use of optimized chip sets makes the system compact and inexpensive, solving the problems of cost, size, and compatibility. >