Victor Company of Japan, Limited

Koichi Kido

Kenji Shibayama

Masahiko Tsuruta

Hiroshi Yamada

Akira Hirota

Yasutoshi Matsuo

Naomichi Nishimoto

Masato Mihara

Kaoru Kobayashi

Takeshi Okauchi

Osamu Inoue

Yutaka Isobe

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

A control pulse recording circuit for a magnetic recording and reproducing apparatus comprises a control head, a circuit for detecting leading edges of control pulses reproduced by the control head, a circuit for generating a recording voltage having a polarity which changes at a time in accordance with recording data to be recorded in a re-write operation, and a switching circuit for blocking supply of the recording voltage to the control head at a time which is after a predetermined time from a time when the re-writing operation is ended and is immediately before a next leading edge of the control pulses.

Control pulse recording circuit for magnetic recording and reproducing

A magnetic recording and/or reproducing apparatus comprises a cassette discriminating circuit for discriminating whether a loaded tape cassette accommodates a standard tape or a high performance tape in a recording mode, a mode discriminating circuit for discriminating from a signal reproduced from the tape in a reproducing mode a mode with which the tape was recorded at the time of the recording, and a switching circuit for automatically switching the operation mode to a predetermined mode responsive to the discrimination made by the cassette discriminating circuit in the recording mode and responsive to the discrimination made by the mode discriminating circuit in the reproducing mode. The high performance tape is playable either in a standard mode or a high quality mode.

Magnetic recording/reproducing apparatus which accomodates different

A noise reduction system for reducing noise in a video signal comprises a pre-emphasis circuit for subjecting the video signal which is supplied to a transmission system to a pre-emphasis in a vertical direction of a picture and in a direction oblique to the vertical direction, and a de-emphasis circuit for subjecting the pre-emphasized video signal obtained through the transmission system to a de-emphasis complementary to the pre-emphasis.

Noise reduction system for video signal

A magnetic recording apparatus for carrying out a recording by selectively using one of two kinds of recording systems comprises first through fourth rotary magnetic heads, a first circuit for producing an FM luminance signal, second and third circuits for producing first and second frequency division multiplexed signals, and a switching circuit. The first and second heads are mounted on a rotary body at mutually opposing positions, and have the same height position. The third and fourth heads are mounted on the rotary body at mutually opposing positions respectively in vicinities of the first and second heads along a rotating direction of the rotary body, and have the same height position. The switching circuit selectively supplies the output signals of the first and second circuits to the first through fourth heads when a luminance/color separation recording system is selected as the recording system, and selectively supplies the output signal of the third circuit to the first and second heads or to the third and fourth heads when a low band conversion color recording system is selected as the recording system.

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Yokosuka, Japan

Koichi Kido