Nippon Hoso' Kyokai

Matsushita Electric Industrial Co., Ltd.

Sony Corporation

Hitachi, Ltd.

Nec Home Electronics, Inc.

Matsushita Communication Industrial Co., Ltd.

Kinseki Limited

Nhk Engineering Services, Inc.

Nippon Noso Kyokai

Nippon Hoso Kyokai, Both of

Yuichi Ninomiya

Yoshimichi Ohtsuka

Yoshinori Izumi

Toshiro Ohmura

Mitsuo Isobe

Naoji Okumura

Hiromu Kitaura

Toshihiro Miyoshi

Tadashi Kawashima

Yutaka Tanaka

Seiichi Gohshi

Taiichiro Kurita

Taiji Nishizawa

Takushi Iwamoto

Masanori Hamada

Isao Kawahara

Katsumi Morita

Yoshio Hirauchi

Hisashi Arita

Kunio Matsumoto

Sei'ichi Goushi

Hiroshi Kanno

Yukihiro Okada

Shigeru Hirahata

Tadao Fujita

Masayuki Sugawara

Takumi Okamura

Kenji Takanashi

Shinobu Torikoshi

Koichi Yamaguchi

Noboru Kojima

Toshiyuki Sakamoto

Kazumasa Enami

Isao Kondo

Kunihiko Hontani

Hiroshi Yokokawa

Yoshiaki Shishikui

Hideyuki Ikuhara

Yuichi Iwadate

Kohji Mitani

Kenji Ishikawa

Keisuke Suetsugi

Takeshi Inoue

Masao Fujiwara

Yoshihiro Fujita

Seiki Inoue

Hideki Mitsumine

Tetsuo Mitsuhashi

Toshinori Saitoh

Shigeyuki Miyazaki

Tadoru Kato

Hideo Noguchi

Akira Furutani

Toyokastu Koga

A 3D object graphics display device for storing information about 3D objects such as works of art or buildings, and for displaying them on a 2D display. The '3D shape data' and 'texture data' of a 3D object is stored in a memory in advance. When an operator operates a manipulator, a 2D image is generated, which would be acquired when the 3D object is seen from a viewpoint indicated by the manipulator, by using the 3D shape data and the texture data in every 1/60 sec or less interval (that is, a minimum display interval of the display device). The 2D image is shown on the display, giving the operator a virtual-reality-like feeling as if he was actually holding the 3D object.

3D object graphics display device, 3D object graphics display method,

A retina direct display device provides an observer with the display of a plane image or a stereoscopic image. The retina direct display device is, for example, incorporated with an acoustic device to constitute a television receiver. The retina direct display device comprises a visible light conversion means, a retina projection means and an eye movement tracking means. The visible light conversion means converts an input video signal to a beam of visible light. The retina projection means deflects the beam horizontally and vertically so that retinas are raster scanned through pupils of both eyes by the deflected beam. The eye movement tracking means detects the movement direction of the pupils and permits the direction of the beam emitted from the retina projection means to track the movement of the pupils based on the result of the detection. Accordingly, the device enables the video display of high resolution without deteriorating picture quality of the input video signal of high quality and also enables the reduction of the size and manufacturing cost of the device.

Retina direct display device and television receiver using the same

By applying the offset sampling using four-plane prism provided with four solid state imaging devices at four light output planes, chromatic aberration of lenses is eliminated even to the peripheral part of the imaging plane, and moire suppression effect is much enhanced. Furthermore, by using a plural number of matrix circuits, and by producing the luminance signal by changing the matrix ratios in low frequency range and in high frequency range, moire suppression effect is further enhanced, and luminance error is also eliminated.

Solid state video camera having improved chromatic aberration

A digital audio signal demodulation circuit comprises a synchronous detection circuit (18) and a muting circuit (17) for muting the output from an interpolation circuit (16) using a synchronization lock signal generated from the synchronous detection circuit (18) when synchronization has been lost. The differential signal output from the interpolation circuit (16) is muted by the muting circuit (17) and thereafter integrated by an integration circuit (19). Thus, an audio signal with high sound quality can be demodulated without producing interruption noise even when synchronization has been lost or forcible muting is done.

Audio signal demodulation circuit

Video signal switching circuit especially suitable for high definition

There is disclosed a compatible television receiver capable of receiving and reproducing both the standard system television signal and the high definition television signal and capable of confining the degradation of picture quality of the high definition television signal to the minimum, in which the received standard system television signal and high definition television signal are respectively converted to non-interlace signals, and scanning is selectively performed with either of non-interlace video signals to display images. The television receiver according to the present invention comprises a first conversion circuit for receiving an interlace standard system television signal and converting it into a non-interlace television signal, a second conversion circuit for receiving an interlace high definition television signal and converting it into a non-interlace televison signal, a circuit for discriminating whether the received signal is the standard system television signal or the high definition signal, and a circuit for selecting either of outputs of the first and second conversion circuits on the basis of the result obtained in the discrimination circuit.

Television receiver compatible with both standard system television

Audio signal demodulating circuit with reduced power consumption

Interframe deinterleave switching circuit

A television receiver is provided with two field memories for storing movement control signals, an OR circuit, a frame memory for storing the present and previous fields, a pair of switches controlled by a freeze signal, a switch controlled by the output signal of the OR circuit, and another switch for changing over its output signal to and from the output signal from the switch controlled by the OR circuit and the signal from the frame memory representing the present field. One frame's worth of video signals of the present field and the previous field are stored in the frame memory by a freeze signal. The signals stored in the frame memory provide a freeze picture having no multi-line dimness by virtue of using the present field and the previous field for the still picture image portion and the present field for the moving picture image portions of the present field and the previous field.

Television receiver

A clamp system for television signal comprises a first clamp device for clamping to a clamp control voltage supplied from an external source by a horizontal clamp pulse and a second clamp device for controlling the DC potential of the television signal by adding the externally-supplied control voltage to an input television signal. The first clamp device is used during the period requiring an early clamp start, and the second clamp device is operated under normal conditions.

Clamp system used for television signal

An image signal processing apparatus is provided which is applicable to a motion adaptive Y/C separation of an NTSC signal and a time-domain/spatial interpolation of a high definition television signal band-compressed by sub-Nyquist sub-sampling. The apparatus includes a still image processing circuit having frame memories, a motion image processing circuit having a line memory, a mixing circuit for mixing outputs of these processing circuits, a circuit for detecting image motion of an input image signal and applying a resultant control signal to the mixing circuit, and a signal mode control circuit for selectively adapting the image processing circuits for the processing of the NTSC signal or the high definition television signal. The motion detecting circuit includes a narrow band detecting circuit for producing a one-frame interval difference signal of a signal spectrum of a pure low frequency component from the NTSC signal or the high definition television signal respectively, a wide band detecting circuit for a two-frame interval difference signal and a composition circuit for composing outputs of these detecting circuits. The still image processing circuit, motion image processing circuit and mixing circuit are adapted to operate for the Y/C separation with the NTSC signal and for the interpolation of the high definition television signal, respectively.

Image signal processing apparatus for Y/C separation and for time

An automatic gain control system for controlling a gain of an A/D converter automatically by controlling reference voltages of said A/D converter at the time of analog-to-digital conversion of a signal which signal being clamped by a clamp circuit to a clamp level which is set to a center level before entering said A/D converter, comprising a clamp level control circuit for detecting the clamp level from an output of said A/D converter to control the clamp level; a first A/D converter for digital-to-analog converting an output of said clamp level control circuit; an automatic clamp level control system.

Reference voltage regulation apparatus for an automatic gain control

A television video signal control system is disclosed in which an amplitude control signal and a clamp voltage control signal digitally detected in the automatic gain control and clamp voltage control of a television signal receiver respectively are applied alternately to a single D/A converter. The resulting analog signal is sampled and held alternately at holding circuits corresponding to the two control signals. A D/A converter for converting the two control signals from digital to analog state is thus saved as compared with the prior art.

Television video signal control system

Disclosed is an automatic gain control device which comprises: a first amplitude detection circuit for detecting an average amplitude value of a television video signal, a peak amplitude value of the same television video signal, or a value obtained by mixing the average amplitude value and the peak amplitude value with a predetermined mixing ratio; a second amplitude detection circuit for detecting an amplitude value of a vertical or horizontal synchronizing signal in the television video signal; an amplitude control circuit for controlling an amplitude of an input television video signal; a synchronization circuit for detecting a vertical synchronizing signal and a horizontal synchronizing signal in the television video signal so as to generate various pulses including a clock pulse synchronized with the input television video signal by controlling an oscillation frequency of an oscillation circuit; and a synchronization phase lock detection circuit for detecting whether the synchronization circuit has been pulled into synchronism with the input television video signal, so that the amplitude control circuit is controlled by an output of the second amplitude detection circuit when synchronization phase-lock is established while controlled by an output of the first amplitude detection circuit when the synchronization phase-lock comes out.

Automatic gain control device

Growing community of inventors

Kawasaki, Japan

Yuichi Ninomiya