1
Naoki Sato, Yasuhide Ouchi, Hideki Sawaguchi, Yosuke Hori, Yutaka Okada: Information processing apparatus for processing reproduction signal having nonlinear characteristics. Hitachi, Antonelli Terry Stout & Kraus, May 23, 1995: US05418660 (34 worldwide citation)

A nonlinear compensation A/D converting method and a circuit for compensating asymmetry of a reproduction signal waveform, so as not to deteriorate the performance of a discriminator even if there is a nonlinearity such that the amplitudes of the signal differ in dependence on the polarities of the ...


2
Yoshibumi Matsuda, Masaaki Futamoto, Fumio Kugiya, Yoshinori Miyamura, Takeshi Nakano, Hisashi Takano, Kyo Akagi, Mikio Suzuki, Yasuhide Ouchi: Longitudinal magnetic recording medium and apparatus. Hitachi, Antonelli Terry Stout & Kraus, June 16, 1998: US05766718 (32 worldwide citation)

It is disclosed that a longitudinal magnetic recording medium and apparatus has recording sections having longitudinal magnetic films magnetically isolated in a recording direction. The magnetically isolated recording sections can record a single bit each so that the longitudinal magnetic recording ...


3
Fumiyoshi Kirino, Tsuyoshi Toda, Horishi Ide, Hisataka Sugiyama, Atsushi Saito, Hiroyuki Tsuchinaga, Takeshi Maeda, Fumio Kugiya, Toshimitsu Kaku, Seiichi Mita, Kazuo Shigematsu, Yasuhide Ouchi: Optical disk apparatus and recording and reading method for an optical disk using the same. Hitachi, Pennie & Edmonds, December 30, 1997: US05703855 (30 worldwide citation)

A super high density optical disk apparatus is obtained by using an exchangeable recording medium having a recording capacity of at least 1.5 Gb/in.sup.2 in an optical recording and reading apparatus for recording or reading at least using a laser beam or by using one of an element which can record ...


4
Fumiyoshi Kirino, Tsuyoshi Toda, Hiroshi Ide, Hisataka Sugiyama, Atsushi Saito, Hiroyuki Tsuchinaga, Takeshi Maeda, Fumio Kugiya, Toshimitsu Kaku, Seiichi Mita, Kazuo Shigematsu, Yasuhide Ouchi: Method for recording and reading an optical disk. Hitachi, Pennie & Edmonds, December 8, 1998: US05848045 (29 worldwide citation)

A super high density optical disk apparatus is obtained by using an exchangeable recording medium having a recording capacity of at least 1.5 Gb/in.sup.2 in an optical recording and reading apparatus for recording or reading at least using a laser beam or by using one of means which can record on a ...


5
Hideki Sawaguchi, Yasuhide Ouchi, Hajime Aoi: Peak detection method and apparatus therefor. Hitachi, Fay Sharpe Beall Fagan Minnich & McKee, February 15, 1994: US05287228 (28 worldwide citation)

The time interval/amplitude level difference between sequential peaks in waveforms of first reproducing signals from a recording medium is detected and stored in a storage. The time interval/amplitude level difference between peaks in a waveform of a second reproducing signal from the recording medi ...


6
Naoki Sato, Yasuhide Ouchi, Hirotsugu Kojima, Hideki Sawaguchi, Yosuke Hori: Magnetic recording and reproducing apparatus, reproduction signal processing apparatus, and reproduction signal processing method. Hitachi, Antonelli Terry Stout & Kraus, March 21, 1995: US05400189 (24 worldwide citation)

A reproduction signal processing apparatus includes a memory circuit storing a predetermined pattern for deciding equalizing characteristics of an automatic equalizer in response to variation of a reproduction signal, a pattern converting circuit for converting the predetermined pattern outputted fr ...


7
Yoshihisa Kamo, Hajime Aoi, Hitoshi Kakuta, Yoshito Tsunoda, Hiromichi Fujisawa, Yosuke Seo, Yasuhide Ouchi: Variable length data in a parallel disk array. Hitachi, Antonelli Terry Stout & Kraus, November 5, 1996: US05572699 (23 worldwide citation)

A file system including an input/output unit for inputting data from and outputting data to an external system; a controller connected to the input/output unit for dividing the data into an optional number of parallel data; a management table for storing the number of divisions of the data; a head g ...


8
Yasuhide Ouchi, Hajime Aoi, Takashi Tamura, Nobumasa Nishiyama: Read channel for magnetic recording. Hitachi, Antonelli Terry & Wands, September 27, 1988: US04774601 (21 worldwide citation)

In a read channel for magnetic recording used to reproduce information recorded on a magnetic recording medium, a signal reproduced from a magnetic head and a differentiated signal of the reproduction signal are ORed together to produce a gate signal. By using the gate signal, the information can be ...


9
Nobumasa Nishiyama, Makoto Saito, Yasuhide Ouchi, Yasuhiro Katoh, Yoshihasa Kamo, Makoto Koizumi, Hajime Aoi, Naoki Sato, Reijiro Tsuchiya: Readout circuit in magnetic recording device. Hitachi, Antonelli Terry & Wands, March 6, 1990: US04907100 (19 worldwide citation)

A readout circuit in magnetic recording device is disclosed, in which a test data signal for detecting an error in the characteristics of an automatic equalizer is recorded in a predetermined position of each track of a magnetic recording medium. In readout mode, a test data signal for a selected tr ...


10
Naoki Satoh, Seiichi Mita, Shoichi Miyazawa, Terumi Takashi, Yosuke Hori, Yoshiju Watanabe, Akihiko Hirano, Satoshi Minoshima, Hideki Miyasaka, Toshihiro Nitta, Tomoaki Hirai, Ryushi Shimokawa, Koji Shida, Yasuhide Ouchi: Signal processing circuit and information recording/reproducing apparatus using the same, and method for optimizing coefficients of equalizer circuit. Hitachi, Fay Sharpe Beall Fagan Minnich & McKee, October 6, 1998: US05818655 (12 worldwide citation)

A signal processing circuit for a magnetic recording/reproducing apparatus, including at least an AGC, a PLL, a LPF, an equalizer circuit and a detection circuit, wherein a coefficient compensation circuit is formed by defining a constitution of the equalizer circuit, an error detection circuit is p ...



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