Victor Company of Japan, Limited

Canon Kabushiki Kaisha

Doryokuro Kakunenryo Kaihatsu Jigyodan

Kaoru Kobayashi

Hidetoshi Ozaki

Takeshi Akasaka

Ryo Hirayama

Shigeru Nagase

Hiroyuki Saito

Yasuhiro Yamada

Seiji Higurashi

Hajime Miyazaki

Harukuni Kobari

Kenji Shibayama

Wataru Ando

Koichi Kido

Kazunori Yamamoto

Takeshi Takahashi

Tatsuhisa Kato

Hideyuki Funasaka

Atsushi Miyashita

Kohbun Sakagami

Hirofumi Hisikura

A novel metal-encapsulated fullerene compound wherein a side chain is introduced in a metal-encapsulated fullerene is provided. A metal-encapsulated fullerene compound represented by the following structural formula (1) is synthesized by causing a disilirane derivative or digermirane derivative having the following structural formula (2) to react with a metal-encapsulation fullerene so as to add functional groups to the fullerene. ##STR1## Herein, M is an encapsulated metal atom, m is an integer from 1 to 3, n is an even number from 28 to 200, and R is a t-butyl group or an aromatic group having alkyl groups in the 2,6-positions, such as mesityl, 2,6-diethylphenyl or 2,6-dimethylphenyl groups.

Metal-encapsulated fullerene compound and a method of synthesizing such

An input video signal is applied to a transmission line first through a time direction emphasizer for emphasizing the levels of time direction high frequency components of the video signal, relative to the levels of low frequency components thereof; secondary through a vertical direction emphasizer; and thirdly through a horizontal direction emphasizer. Further, the received video signal is outputted as an output video signal from the transmission line first through a horizontal direction deemphasizer for deemphasizing the levels of horizontal direction high frequency components of the video signal, relative to the levels of low frequency components thereof; secondary through a vertical direction deemphasizer; and thirdly through a time direction deemphasizer. The emphasis and deemphasis method enables the dynamic range of the transmission line to be utilized effectively, while preventing erroneous operation on the reception side.

Video signal emphasis and deemphasis method and apparatus

A photosensitive member having stable electrophotographic characteristics can be constituted by an electroconductive support and a photosensitive layer disposed thereon and containing a novel fullerene compound having an organosilicon group as a charge-transporting substance. The fullerene compound may preferably have a polyhedral structure, particularly that of Buckminsterfullerene (C.sub.60) and be represented by the formula: C.sub.60 (A).sub.n . . . (2), wherein A denotes an organosilicon group represented by the formula: ##STR1## (wherein R.sub.1-1 and R.sub.1-2 independently denote a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted silyl group, a substituted or unsubstituted germyl group, a halogen atom, or a group constituting a substituted or unsubstituted ring by a mutual combination of R.sub.1-1 and R.sub.1-2 together with the Si atom in the formula); and n is an integer of 1 to 5, and a plurality of A in the case of n being two or larger can be the same or different with each other.

Electrophotographic photosensitive member, eletrophotographic apparatus

An HD image signal is recorded and reproduced by a tape head system of a conventional home VTR. An HD image signal (bb) which is of a different broadcasting system from a conventional broadcasting system and contains an information whose amount is larger than that contained in a video signal of the conventional broadcasting system is divided by four by first to eighth memories and resultant four signals are recorded on a magnetic tape through a first to fourth recording signal processing circuits and FM modulators, etc. In reproduction, the four signals are reproduced by FM demodulators and a first to fourth reproduced signal processing circuits, etc., and the HD image signal is produced by using the first to eighth memories.

Magnetic recording and playback apparatus capatible with conventional

An image is stably reproduced in a special reproduction mode of still, frame advance or slow motion mode without residual image and/or blur. A video signal reproducing apparatus operates to alternately repeat the steps of interrupting a de-emphasizing process at a time at which the de-emphasis process for one video image signal period is completed, holding a content of a frame memory constituting the de-emphasis circuit without refreshing the content and performing a de-emphasis process based the content of the memory during a subsequent video image signal period.

Method and apparatus for reproducing a video signal subject to

An afterimage elimination circuit for a liquid crystal display apparatus provides a substantial improvement of the transient response characteristics of the liquid crystal display elements, by adding to an input video signal of the display apparatus a compensation signal, derived from that video signal, having a transient response that is determined in accordance with whether a change in the input video signal level will result in an increase or decrease of electric field strength applied to the display elements, to thereby achieve optimum compensation for both rise time and fall time response of the display elements.

Afterimage elimination circuit for liquid crystal

An image signal processing device comprising a luminance signal output section for outputting an interlaced scanning actual line luminance signal and an interpolation line luminance signal, a color signal output section for outputting an interlaced scanning actual line color signal and an interpolation line color signal, and a control section for controlling the color signal output section, thus to output, as an interpolation line color signal, an interlaced scanning actual line color signal proceeding or succeeding the interpolation line or an average value of color signals of interlaced scanning lines preceding and succeeding the interpolation line.

Image signal processing device

A video signal digital processing system comprises an A/D converter for converting an input analog video signal employing the NTSC or system into a digital video signal, a first frequency converter for generating a signal sampled at a frequency f.sub.s which is a predetermined integer times a horizontal synchronizing signal frequency f.sub.H of the input analog video signal by frequency-converting the digital video signal so that the chrominance subcarrier frequency is converted into a frequency f.sub.s /4, a decimation circuit for performing a 1/3 decimation process with respect to the output signal of the first frequency converter by extracting samples with an interval of two samples, a processing circuit for subjecting an output signal of the decimation circuit to a predetermined signal processing, an interpolation circuit for performing an interpolation process complementary to the decimation process with respect to an output signal of the processing circuit, a second frequency converter for subjecting an output signal of the interpolation circuit to a frequency conversion complementary to the frequency conversion performed in the first frequency converter, and a D/A converter for converting an output signal of the second frequency converter into a an analog video signal.

Video signal digital processing system using lower sampling frequency

A digital phase difference detecting circuit has a phase shifting circuit for shifting by +90.degree. or -90.degree. a phase of an input signal which has been sampled over a predetermined sampling period, a dividing circuit for dividing an output signal of the phase shifting circuit by the input signal, an operation circuit for performing an inverse trigonometric function operation on an output signal of the dividing circuit, and a subtracting circuit for obtaining the difference between an output signal of the operation circuit and a phase of a reference signal. The resulting output signal of the subtracting circuit indicates the phase difference between the reference signal and the input signal.

Digital phase difference detecting circuit

A multi-mode recording and playback system for VTR records audio signals and video signals and plays them back from audio tracks and video tracks on a magnetic tape by means of a plurality of rotating audio and video heads. A rotating drum around which a magnetic tape is wound carries therewith first to fourth rotary video heads and first and second rotary audio heads in predetermined relations with respect to angle and vertical level. In a desired mode, the audio heads write (read) audio signals in audio tracks, and the video heads write (read) video signals in video tracks, such that the centers of the audio and video tracks substantially coincide with each other.

Multi-mode magnetic recording system and multi-mode magnetic recording

A Reed-Solomon code generator applicable to a digital signal recording/playback apparatus checks or corrects code errors in digital signals. The code generator eliminates the need for costly read only memory devices (ROM tables) and uses inexpensive registers, modulo 2 adders and multipliers instead.

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Yokohama, Japan

Kaoru Kobayashi