Patents by Inventor Shoichi Miyazawa
Shoichi Miyazawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7430085Abstract: A signal processing device having a feature of analog-to-digital converting a burst signal has a feature of selecting data bus to notify a disk control device 2 of a conversion result via an NRZ data bus. The disk control device 2 includes means for storing the result of the analog-to-digital conversion of said servo positional signal. The positional signal of a head of the disk device is digitalized in an R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.Type: GrantFiled: August 22, 2006Date of Patent: September 30, 2008Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Motoyasu Tsunoda, Yukie Miyazawa, legal representative, Hitoshi Ogawa, Ryutaro Horita, Takashi Nara, Masatoshi Nishina, Katsumi Yamamoto, Shoichi Miyazawa
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Publication number: 20060285238Abstract: A signal processing device having a feature of analog-to-digital converting a burst signal has a feature of selecting data bus to notify a disk control device 2 of a conversion result via an NRZ data bus. The disk control device 2 includes means for storing the result of the analog-to-digital conversion of said servo positional signal. The positional signal of a head of the disk device is digitalized in an R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.Type: ApplicationFiled: August 22, 2006Publication date: December 21, 2006Inventors: Motoyasu Tsunoda, Shoichi Miyazawa, Yukie Miyazawa, Hitoshi Ogawa, Ryutaro Horita, Takashi Nara, Masatoshi Nishina, Katsumi Yamamoto
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Patent number: 7139143Abstract: A signal processing device for analog-to-digital converting a burst signal has a feature of selecting a data bus to notify a disk control device of a conversion result via an NRZ data bus. The disk control device stores the result of the analog-to-digital conversion of the servo positional signal. The positional signal of a head of the disk device is digitized in a R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.Type: GrantFiled: March 17, 2003Date of Patent: November 21, 2006Assignee: Hitachi, Ltd.Inventors: Motoyasu Tsunoda, Yukie Miyazawa, legal representative, Hitoshi Ogawa, Ryutaro Horita, Takashi Nara, Masatoshi Nishina, Katsumi Yamamoto, Shoichi Miyazawa, deceased
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Patent number: 6700721Abstract: A magnetic recording and reproducing apparatus includes a R/W signal processor having a write data generator arranged to be of an interleave system and transmitting/receiving data to/from the R/W amplifier via a plurality of signal lines. In addition, the R/W amplifier has a compound circuit provided for the write data of the interleave system from the R/W signal processor and is formed as an integrated circuit, moreover, a ½ prescaler is provided at the output of the write data generator, making transmitting and receiving write data in NRZI CODE.Type: GrantFiled: July 10, 2002Date of Patent: March 2, 2004Assignee: Hitachi, Ltd.Inventors: Eisaku Saiki, Shintaro Suzumura, Terumi Takashi, Kazutoshi Ashikawa, Tsuguyoshi Hirooka, Shoichi Miyazawa, Masashi Mori
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Patent number: 6661594Abstract: 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 provided which operates by receiving input from the detection circuit, and the LSI is formed by a plurality of analog and digital chips, and the analog and digital chips are connected by current-output type D/A converters connected to at least the AGC and the PLL.Type: GrantFiled: October 23, 2002Date of Patent: December 9, 2003Assignee: Hitachi, Ltd.Inventors: 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
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Publication number: 20030179479Abstract: A signal processing device having a feature of analog-to-digital converting a burst signal has a feature of selecting data bus to notify a disk control device 2 of a conversion result via an NRZ data bus. The disk control device 2 includes means for storing the result of the analog-to-digital conversion of said servo positional signal. The positional signal of a head of the disk device is digitalized in an R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.Type: ApplicationFiled: March 17, 2003Publication date: September 25, 2003Applicant: Hitachi, Ltd.Inventors: Motoyasu Tsunoda, Shoichi Miyazawa, Hitoshi Ogawa, Ryutaro Horita, Takashi Nara, Masatoshi Nishina, Katsumi Yamamoto, Yukie Miyazawa
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Patent number: 6563656Abstract: A signal processing device for analog-to-digital converting a burst signal has a feature of selecting a data bus to notify a disk control device of a conversion result via an NRZ data bus. The disk control device stores the result of the analog-to-digital conversion of the servo positional signal. The positional signal of a head of the disk device is digitized in a R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.Type: GrantFiled: July 23, 2002Date of Patent: May 13, 2003Assignee: Hitachi, Ltd.Inventors: Motoyasu Tsunoda, Shoichi Miyazawa, Hitoshi Ogawa, Ryutaro Horita, Takashi Nara, Masatoshi Nishina, Katsumi Yamamoto
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Publication number: 20030035236Abstract: 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 provided which operates by receiving input from the detection circuit, and the LSI is formed by a plurality of analog and digital chips, and the analog and digital chips are connected by current-output type D/A converters connected to at least the AGC and the PLL.Type: ApplicationFiled: October 23, 2002Publication date: February 20, 2003Applicant: Hitachi, Ltd.Inventors: 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
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Publication number: 20020196570Abstract: A signal processing device having a feature of analog-to-digital converting a burst signal has a feature of selecting data bus to notify a disk control device 2 of a conversion result via an NRZ data bus. The disk control device 2 includes means for storing the result of the analog-to-digital conversion of said servo positional signal. The positional signal of a head of the disk device is digitalized in an R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.Type: ApplicationFiled: July 23, 2002Publication date: December 26, 2002Applicant: Hitachi, Ltd.Inventors: Motoyasu Tsunoda, Shoichi Miyazawa, Hitoshi Ogawa, Ryutaro Horita, Takashi Nara, Masatoshi Nishina, Katsumi Yamamoto, Yukie Miyazawa
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Publication number: 20020171960Abstract: A magnetic recording and reproducing apparatus includes a R/W signal processor having a write data generator arranged to be of an interleave system and transmitting/receiving data to/from the R/W amplifier via a plurality of signal lines. In addition, the R/W amplifier has a compound circuit provided for the write data of the interleave system from the R/W signal processor and is formed as an integrated circuit, moreover, a ½ prescaler is provided at the output of the write data generator, making transmitting and receiving write data in NRZI CODE.Type: ApplicationFiled: July 10, 2002Publication date: November 21, 2002Inventors: Eisaku Saiki, Shintaro Suzumura, Terumi Takashi, Kazutoshi Ashikawa, Tsuguyoshi Hirooka, Shoichi Miyazawa, Masashi Mori
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Patent number: 6452736Abstract: A magnetic recording and reproducing apparatus includes a read/write signal processor having a write data generator arranged to be of an interleave system and transmitting/receiving data to/from the read/write amplifier via a plurality of signal lines. In addition, the read/write amplifier has a compound circuit provided for the write data of the interleave system from the read/write signal processor and is formed as an integrated circuit, moreover, a 1/2 prescaler is provided at the output of the write data generator, transmitting and receiving write data in Non-Return-To-Zero-Interleave CODE.Type: GrantFiled: May 25, 1995Date of Patent: September 17, 2002Assignee: Hitachi, Ltd.Inventors: Eisaku Saiki, Shintaro Suzumura, Terumi Takashi, Kazutoshi Ashikawa, Tsuguyoshi Hirooka, Shoichi Miyazawa, Masashi Mori
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Patent number: 6445522Abstract: A signal processing device for analog-to-digital converting a burst signal has a feature of selecting a data bus to notify a disk control device of a conversion result via an NRZ data bus. The disk control device stores the result of the analog-to-digital conversion of the servo positional signal. The positional signal of a head of the disk device is digitalized in a R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.Type: GrantFiled: November 21, 2000Date of Patent: September 3, 2002Assignee: Hitachi, Ltd.Inventors: Motoyasu Tsunoda, Shoichi Miyazawa, Hitoshi Ogawa, Ryutaro Horita, Takashi Nara, Masatoshi Nishina, Katsumi Yamamoto
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Patent number: 6400523Abstract: A magnetic disk recording and reproducing apparatus comprising a unit for inserting an error correcting code related to control information into said control information on data; a recording control unit for recording in a plurality of sectors formed by dividing the recording area of a magnetic disk, each sector having an ID area for recording said control information and a data area, provided adjacent to and behind said ID area, for recording said data; and a error correcting unit for correcting said control information of said ID area by said error correcting code before data is read from said data area corresponding to said ID area or data is recorded in said data area corresponding to said ID area.Type: GrantFiled: April 20, 2001Date of Patent: June 4, 2002Assignee: Hitachi, Ltd.Inventors: Yukari Katayama, Hitoshi Ogawa, Motoyasu Tsunoda, Tsuneo Hirose, Akira Kojima, Eisaku Saiki, Yasunori Kaneda, Katsuhiro Tsuneta, Shoichi Miyazawa, Terumi Takashi
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Publication number: 20020021517Abstract: A magnetic disk recording and reproducing apparatus comprising a unit for inserting an error correcting code related to control information into said control information on data; a recording control unit for recording in a plurality of sectors formed by dividing the recording area of a magnetic disk, each sector having an ID area for recording said control information and a data area, provided adjacent to and behind said ID area, for recording said data; and a error correcting unit for correcting said control information of said ID area by said error correcting code before data is read from said data area corresponding to said ID area or data is recorded in said data area corresponding to said ID area.Type: ApplicationFiled: April 20, 2001Publication date: February 21, 2002Inventors: Yukari Katayama, Hitoshi Ogawa, Motoyasu Tsunoda, Tsuneo Hirose, Akira Kojima, Eisaku Saiki, Yasunori Kaneda, Katsuhiro Tsuneta, Shoichi Miyazawa, Terumi Takashi
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Publication number: 20010009483Abstract: 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 provided which operates by receiving input from the detection circuit, and the LSI is formed by a plurality of analog and digital chips, and the analog and digital chips are connected by current-output type D/A converters connected to at least the AGC and the PLL.Type: ApplicationFiled: February 20, 2001Publication date: July 26, 2001Inventors: 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
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Patent number: 6236528Abstract: A disk type recording and reproducing apparatus includes a disk type recording medium having a plurality of tracks and having stored on each of the plurality of tracks a position signal indicating positions on the tracks; a drive section for rotating the disk type recording medium; a dual head separately incorporating a reading head for reading from the disk type recording medium and a writing head for writing into the disk type recording medium; a head drive section for moving the dual head; means for controlling the head drive section by a controlled variable in compliance with a position signal read from the disk type recording medium using an object track and the reading head; and memory means for storing quantity information used to correct the controlled variable of the means for controlling the head drive section.Type: GrantFiled: August 21, 2000Date of Patent: May 22, 2001Assignee: Hitachi, Ltd.Inventors: Yukari Katayama, Hitoshi Ogawa, Motoyasu Tsunoda, Tsuneo Hirose, Akira Kojima, Eisaku Saiki, Yasunori Kaneda, Katsuhiro Tsuneta, Shoichi Miyazawa, Terumi Takashi
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Patent number: 6172828Abstract: A signal processing device having a feature of analog-to-digital converting a burst signal has a feature of selecting a data bus to notify a disk control device of a conversion result via an NRZ data bus. The disk control device stores the result of the analog-to-digital conversion of the servo positional signal. The positional signal of a head of the disk device is digitalizes in a R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.Type: GrantFiled: May 15, 1997Date of Patent: January 9, 2001Assignee: Hitachi, Ltd.Inventors: Motoyasu Tsunoda, Shoichi Miyazawa, Hitoshi Ogawa, Ryutaro Horita, Takashi Nara, Masatoshi Nishina, Katsumi Yamamoto
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Patent number: 6108158Abstract: A disk type recording and reproducing apparatus includes a disk type recording medium, and a dual head including a reading head and a writing head. A center of the core of the reading head is shifted in the radial direction of the disk type recording medium relative to a center of the core of the writing head. The disk type recording medium has a plurality of recording tracks each having a plurality of sectors. Each of the sectors has an ID division provided ahead of a data division disposed in the circumferential direction of the disk type recording medium. The ID division has recorded therein identification information identifying the sector. A center line of the ID division is shifted in the radial direction of the disk type recording medium relative to a center line of the data division by a distance equal to a distance by which the center of the core of the reading head is shifted in the radial direction of the disk type recording medium relative to the center of the core of the writing head.Type: GrantFiled: May 19, 1997Date of Patent: August 22, 2000Assignee: Hitachi, Ltd.Inventors: Yukari Katayama, Hitoshi Ogawa, Motoyasu Tsunoda, Tsuneo Hirose, Akira Kojima, Eisaku Saiki, Yasunori Kaneda, Katsuhiro Tsuneta, Shoichi Miyazawa, Terumi Takashi
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Patent number: 5953513Abstract: The recording and reproducing apparatus comprises an Small Computer System Interface (SCSI) controller, an optical disc device, a magnetic disc device, a disc controller which controls the optical disc device and the magnetic disc device, connectors which connects directly the optical disc device and the magnetic disc device, and a selector which selects one of the optical disc device and the magnetic disc device. A Copy or Verify command is carried out within the apparatus without an SCSI bus, and data are transferred through the connector. Therefore occupation of the SCSI bus and overhead of the SCSI protocol are eliminated, and the apparatus is miniaturized by common use of the SCSI controller and the disc controller.Type: GrantFiled: July 24, 1995Date of Patent: September 14, 1999Assignee: Hitachi, Ltd.Inventors: Eisaku Saiki, Takashi Oeda, Shoichi Miyazawa, Kazuo Shigematsu, Yasunori Kaneda
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Patent number: RE39253Abstract: Apparatus for recording and/or reproducing user data recorded on a record medium. The apparatus includes record encoder for converting original user data into encoded user data of a predetermined record code and as error correcting code generator for generating original error correcting code data for correcting an error with respect to the encoded user data. A write unit records the encoded user data and the error correcting code on the record medium. A read unit reads the recorded data and the reproduced data is error corrected so as to provide the original user data.Type: GrantFiled: June 22, 2000Date of Patent: August 29, 2006Assignee: Hitachi, Ltd.Inventors: Yukari Katayama, Yukie Miyazawa, Hitoshi Ogawa, Masatoshi Nishina, Shoichi Miyazawa