Kiyoyuki Kawai

IDTV Receiver

There is recently struck, a bold demand for improvement in conventional NTSC picture quality. This demand is born of low quality of color, cross luminance, and interline flicker. However, we have now developed an experimental IDTV receiver which will diminish these imperfections through the non-interlaced system with the vertical resolution of 450 TV lines. The IDTV receiver was implemented by using digital LSIs and large capacity memory chips now available.

A wide screen EDTV

A novel EDTV (extended-definition television) system using three-dimensional filtering techniques has been proposed. A wide-screen TV signal with 5.6 MHz bandwidth can be encoded within a 4.2 MHz baseband using three multiplexing techniques. The feasibility of the approach has been verified by computer simulation. The encoded signal will be compatible with most existing broadcasting equipment, since the signal format is fully compatible with the NTSC signal standard. >

Teletext equalizer LSI

A large-scale integration (LSI) digital teletext equalizer chip is described that consists of a 13-tap adaptive equalizer and a data regeneration circuit. It achieves high-level performance such as wide equalization range (-0.5-1.5 mu s), short convergence time (1-3 s), good eye height improvement ratio, and high stability. The device greatly improves the teletext receivers performance and extends the service area to such locations where strong ghosts damage the teletext signal. This chip can be easily installed on a teletext decoder board because it does not need any external controller and is functionally independent from the other teletext data processing circuits. The chip can be used with the 525 line/60 Hz NTSC TV system and the 625 line/50 Hz PAL TV system. >

A high performance EDTV system

An encoder and a decoder, consisting of a wide screen EDTV system compatible with current NTSC equipment, have been developed. The system, however, showed some problems that required attention. Therefore, an advanced EDTV system, consisting of an improved wide screen EDTV system and an advanced scan converting system, was developed. The former improves picture quality of the side panels and extends horizontal resolution of the center panel. The latter improves vertical resolution without the motion artifact observed in a conventional scan converter. >

A compatible wide aspect ratio TV

Describes a new proposal of wide aspect ratio TV signal format, which is fully compatible with current NTSC receivers and terrestrial transmitters. In order to realize the compatibility, the proposed signal features a new format of three dimensional frequency domain multiplexing.<<ETX>>

The transceiver controller IC for home bus system

A transceiver controller IC has been developed for the improvement of the home bus system (HBS). The functions of the new IC cover the logical conditions of the physical layer of the OSI (open systems interconnection) reference model. Therefore, even a low cost, single chip microcomputer can easily control both home electronic products and the communication of HBS simultaneously by using the IC.<<ETX>>

A New Scanning Line Conversion Technique on Frame Basis

I NTRODUCT I ON Recently, new enhanced definition wide-screen (aspect ratio 16:9) TV systems, such as PAL-plus in Europe and EDTVII in Japan, have been discussed. These systems exploit letter-box signal format to be compatible with existing TV receivers whose aspect ratio is 4:s. Such systems require scanning line conversion to reproduce full wide-screen images. We developed a new scanning line conversion technique. In the new technique, namely frame base processing like an inter-field processing, is applied to motion images as well as stationary images instead of the intra-field processing. The new technique can considerably eliminate the residual aliasing component and improve the vertical high resolution.

A High Quality Digital TV Utilizing 2 CMOS Chips

We have developed the digital TV system IC line-up which consists of 2 MOS LSIs and 4 Bipolar ICs. Digital signal processing is carried out in 2 LSIs with 1.5um-rule CMOS technology, by which picture quality can be improved. It has been designed for both NTSC and PAL systems and it is adaptive for double-line scanning.