Shinichi Makino

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 Novel Automatic Ghost Canceller

Ghost is one of the most serious problems in TV reception. Ghost reduction is highly desirable, and some automatic deghosting systems have been reported [1] ,[2] [3], [4]. All the systems utilize transversal filters. The approach with a transversal filter may be the best way.

A Fully Automatic Ghost Canceller

Ghost may be one of the largest remnaining causes of picture degradations as TV broadcast and receivers quality increases rapidly. Even the best antennas are not always adequate to remove ghosts. Most of the existing systems are not practical because they must be readjusted for each channel and different meteorogical conditions.

A Digital Time Domain Equalizer for Teletext

Some trials to reduce TV ghosts have been reported, utilizing transversal filters. (114) They are effective for video ghost reduction as well as for Teletext equalizing.

An Experimental Digital 1.2 Gbit/sec VCR for 1125/60 HDTV Signals

This article describes a cassette-type digital baseband HDTV recorder developed by Toshiba that uses a 19mm D-2 cassette and allows 60-min recording. This experimental model indicates that the 19mm VCR will be easily accepted in the field. Working completely independently, BTS GmbH of Germany has developed a similar 19mm digital HDTV recorder with design parameters that are almost identical to the Toshiba model. Format unification between the two recorders has been achieved, and the device has been proposed to SMPTE as a 19mm digital data recorder for HDTV signal recording

A Novel TV Remote Control System

A remote controller has definitely become one of the desirable features for TV receivers. Up to 4% of TV receivers sold in Japan are equipped with remote controller. Conventional remote control systems can be classified into the following two systems:

An Integrated Channel Selection System

Recent advent of varactor diode tuners has stimulated TV engineers to devise novel electronic channel selecors. The authors have developed a fully integrated channel selection system using only two ICs; one p-channel MOS LSI for channel selection and one bipolar IC for voltage selection.

55 inch High Definition Projection Display

Toshiba has developed a 55-inch high definition rear projection display with high luminance and resolution, with an expanded viewing angle, not only in the horizontal direction but in the vertical direction as well. In Japan, it is foreseen that the high definition television will begin spreading through use in CATV and video displays at exhibitions, and in small theaters, rather than in homes. These applications would require bright display with a large screen and wide viewing angle, so that they can be seen by larger number of viewers. Achieving a wide viewing angle suitable for these purposes, however, was a difficult matter in a projection type display development. Conventional rear projection displays use a 2-layer acrylic sheet screen, consisting of a lenticular lens and a Fresnel lens. This structure is only effective in expanding the horizontal viewing angle. Toshibas newly developed display employs a third screen inserted between the two other screen sheets, which increases the vertical viewing angle by 26 %. Furthermore, the electronic beam diameter of the projection tube has been reduced by 20% resulting in a high resolution of 1000 TV lines. To obtain high luminance, the luminous efficiency of the green phosphor has been improved by 20%. As a result, the peak luminance of the picture reaches 125ft-L or more, which is the highest value for any display currently available for professional HDTV purposes.

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.

A Pocketable Liquid-Television Receiver

Various kinds of numeric or alphanumeric display devices have been studied, some of which are applied to display pictures. As far as picture display is concerned, a cathode ray tube is superior because of such excellent quality as brightness, contrast and response time. But a CRT has drawbacks of weight, size and power dissipation. A liquid-crystal picture display, on the other hand, has an advantage over a CRT in that it can make a TV receiver thin, small and light.