Hitachi, Ltd.

Hitachi Maxell, Limited

Masatoshi Ohtake

Motoyasu Terao

Akemi Hirotsune

Tsuyoshi Toda

Hideki Saga

Makoto Miyamoto

Tetsuya Nishida

Yumiko Anzai

Junko Ushiyama

Keikichi Andoo

Seiji Yonezawa

Toshiaki Tsuyoshi

Wasao Takasugi

Takashi Takeuchi

Kazuo Ichino

Takeshi Maeda

Masaru Ito

Harushige Nakagaki

Nobuo Hamamoto

Katsutaka Kimura

Toshimitsu Kaku

Toshio Sasaki

Yoshito Tsunoda

Kimio Tatsuno

Keiji Kataoka

Sumio Hosaka

Toshiaki Masuhara

Morishi Izumita

Shigeyuki Hosoki

Minoru Nagata

Yukio Fukui

Katsuro Sasaki

Naoki Ozawa

Kazunari Nakagawa

Hidehito Obayashi

Kiyoshi Aiki

Kazuhiro Kondo

Tadashi Saitoh

Takeshi Tottori

Hiroshi Tooyama

Keiji Takata

Takehiro Ohkawa

Isamu Orita

Hiroshi Kishida

Tadashi Onishi

Hisashi Horikoshi

Hitoshi Kondou

Yutaka Kinebuti

Recording information is disclosed in which an information recording medium is irradiated with a recording energy beam that is power-modulated into at least a record power level and a record-ready power level lower than the record power level. The information is recorded on the recording medium in the form of length and interval of a mark portion. When forming a mark portion of a predetermined length, the radiation energy of the energy beam is increased as compared with when forming a mark portion of a different length before or after the first pulse of an energy beam pulse train including at least a pulse for forming the mark portion.

Information recording method and apparatus with suppressed mark edge jitters

A method for recording information is disclosed in which an information recording medium is irradiated with a recording energy beam power-modulated into at least a record power level and a record-ready power level lower than the record power level. When forming a mark portion of a predetermined length, the radiation energy of the energy beam is increased as compared with when forming a mark portion of a different length before or after the first pulse of an energy beam pulse train including at least a pulse for forming the mark portion. Also, only in the case where the energy beam is modulated by the power lower in power level than the record-ready power level after the last pulse of the energy beam pulse train including at least one pulse for forming a mark portion and the mark portion is followed by a space portion of a predetermined length, the particular radiation energy of low power level is reduced as compared with when the mark portion is followed by a space potion of a different length. The radiation energy is increased and/or decreased.

In a digital information system for realizing the sale of information or the like having a commercial value in the form of a digital signal, and an audio processor, and signal processor suitably used with the system, when a digital signal is received/delivered, a digital signal source is connected directly to a player for receiving and storing a specified information, which is reproduced by the player independently. A voice interval of a digital audio signal is processed to realize the slow and fast playback. The system includes a data compressor and a data extender of simple configuration. The value of the digital signal received/delivered can be exhibited directly. A selling system is constructed easily, and the player is simple in configuration and easy to operate by anyone. The fast and slow playback are possible without deteriorating the sound quality, and ripples can be greatly reduced against the digital input signal, thereby making possible a faithful data compression of an acoustic signal or the like by a simple configuration. The self-diagnosis function permits the use of a defective memory chip, thereby leading to a very economical system.

Digital information system, digital audio signal processor and signal converter

A contactless parallel data transfer device which is miniature, highly densed, and highly reliable having a coil block consisting of a first coil group installed in a portable memory and a coil block consisting of a second coil group installed in a data server for transferring access data in parallel between the portable memory (memory card, etc.) and the data server by contactless coupling, wherein the opposite coils of the first and second coil blocks are held close and opposite to each other on a contactless basis, and a parallel pulse group which is transferred in parallel between the both coil blocks is divided at least into a first parallel pulse group consisting of the first number of bits and a second parallel pulse group consisting of the second number of bits, and the parallel transfer timings of the both parallel pulse groups are different from each other, and an induced signal to the neighboring coils of each opposite coil pair of the first and second coil blocks is negated in the opposite phase.

Noise reduced contactless parallel data transfer device and method

Growing community of inventors

Ome, Japan

Masatoshi Ohtake