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11. 发明专利

JPH02289975A PARALLEL TRANSFER TYPE DISK SYSTEM 失效
公开(公告)号：JPH02289975A
公开(公告)日：1990-11-29
申请号：JP10762089
申请日：1989-04-28
申请人： HITACHI LTD
发明人： KAMO YOSHIHISA , TSUNODA HITOSHI , SEO YOSUKE , AOI MOTOI , OUCHI YASUHIDE
IPC分类号： G06F3/06 , G11B20/10 , G11B20/12
摘要： PURPOSE:To improve the throughput of a file system by removing a defective track when the defective track is present and redistributing data. CONSTITUTION:A track decision part 160 detects a defective track among plural tracks to which data divided in parallel are assigned. When there is the defective track present among the tracks to which the data are assigned, a buffer memory 110 is stored with digital data assigned to the defective track. Further, recording and reproducing circuits 44 - 47 while recording data assigned to tracks other than the defective track among the tracks where data are recorded records the data assigned to the defective track on a buffer memory 110. Therefore, even when there is the defective track present, data can be recorded and reproduced by single-time data transfer. Consequently, the throughput of the file system is improved.

12. 发明专利

JPH02176822A FILE SYSTEM 失效
公开(公告)号：JPH02176822A
公开(公告)日：1990-07-10
申请号：JP23999189
申请日：1989-09-18
申请人： HITACHI LTD
发明人： KAMO YOSHIHISA , AOI MOTOI , TSUNODA HITOSHI , TSUNODA YOSHITO , FUJISAWA HIROMICHI , SEO YOSUKE , OUCHI YASUHIDE
IPC分类号： G06F3/06 , G06F12/00
摘要： PURPOSE:To obtain a file system which can flexibly comply with the user requests by deciding the number of divided data in response to the data length and the data transfer speed to assign the divided data to the areas of a disk and therefore dividing freely the file system. CONSTITUTION:A subdisk controller 3 decodes the recording instruction and data received via a channel switch 2 in a data recording state. In this case, a specific data set to which the data to be recorded belongs, the number of divided data, the disk device number, etc., are read out of a disk control table 4. The recording data are converted into the parallel data based on the number of divided data and stored in a command register together with the instructions which start the paths in response to the number of divided data and start one or plural drives. These commands are sent to the strings 6 - 9 via a path switch 5. The transmitted recording instructions and recording data are recorded into the designated disks 65 - 68 via the disk control circuits 63, 64, etc., set on each path.

13. 发明专利

JPH0290816A METHOD AND CIRCUIT FOR CORRECTING ERROR 失效
公开(公告)号：JPH0290816A
公开(公告)日：1990-03-30
申请号：JP24097988
申请日：1988-09-28
申请人： HITACHI LTD
发明人： OUCHI YASUHIDE , AOI MOTOI , KAMO YOSHIHISA , SEO YOSUKE , TSUNODA HITOSHI
IPC分类号： G06F11/10 , G06F11/14 , H03M13/00
摘要： PURPOSE:To always and accurately restore information if errors occur by rereading information when the errors occur in the reproduction of information and substituting data on an error part for accurate data among original information. CONSTITUTION:When there is the errors in data 1 obtained by reproducing a certain piece of information in a magnetic file driving device 101, they are inputted to an error part specifying circuit 3A, which specifies in which part of data 1 the errors exist. The errors generally occur at random, and it frequently occurs that the error parts of data reproduced from the same record and retried data 2 differ. Consequently, a data substitution circuit 3B substitutes the place that the error part specifying circuit 3A has specified among data 1 for retried data 2. Thus, data can accurately be reproduced even if data cannot accurately be restored in conventional technique.

14. 发明专利

JPS61114611A Waveform equalizing circuit 失效
标题翻译：波形均衡电路
公开(公告)号：JPS61114611A
公开(公告)日：1986-06-02
申请号：JP23490684
申请日：1984-11-09
申请人： Hitachi Ltd
发明人： NISHIYAMA NOBUMASA , AOI MOTOI , TAMURA TAKASHI , OUCHI YASUHIDE , SAITO MAKOTO , IKEDA MASAMITSU , OGAWA TAKUJI
IPC分类号： G11B20/10 , G11B5/09 , H03H11/04 , H03H15/00 , H03H17/00 , H03H21/00 , H04B3/04
摘要： PURPOSE: To obtain a reproducing system suitable for high bit density by using a delay element and an attenuator, retarding a reproduced waveform up to a position where undershoot of an isolate reproducing waveform, attenuating it to a prescribed amplitude, superimposing the result of the original isolate reproducing waveform sop as to decrease the undershoot thereby using a thin film head.
CONSTITUTION: Attenuators 16, 15, 14 have attenuation factors C
-1 , C
0 , C
1 respectively and delay times of delay elements 12, 13 are selected as τ
-1 , τ
1 . The isolate reproducing waveform P read by the head is inputted to an adder circuit 17 via the attenuators, and delay elements respectively. Waveforms (a), (b), (cl) inputted to input terminals A, B, C of the adder circuit 17 are shown in curves 22, 21, 20 respectively and the waveform of the output Q is shown in curve 23. Thus, the output waveform with almost no undershoot in the isolate reproducing waveform is obtained by selecting properly the delay times and attenuation factors in such a way.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：为了通过使用延迟元件和衰减器来获得适合于高位密度的再现系统，将再现波形延迟到隔离再现波形的下冲位置，将其衰减到规定的幅度，将原始结果重叠隔离再现波形图，以便减少下冲从而使用薄膜头。构成：衰减器16,15,14分别具有衰减因子C-1，C0，C1，延迟元件12,13的延迟时间被选择为τ1，τ1。由磁头读取的隔离再现波形P经由衰减器和延迟元件分别输入到加法器电路17。输入到加法器电路17的输入端子A，B，C的波形（a），（b），（c1）分别示于曲线22,21,20中，输出Q的波形如曲线23所示。通过以这种方式适当地选择延迟时间和衰减因子，可以获得隔离再现波形中几乎没有下冲的输出波形。

15. 发明专利

JP2004146060A Optical information reproducing method 有权
公开(公告)号：JP2004146060A
公开(公告)日：2004-05-20
申请号：JP2004003206
申请日：2004-01-08
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TSUCHINAGA HIROYUKI , TODA TAKESHI , IDE HIROSHI , KIRINO FUMIYOSHI , MAEDA TAKESHI , OUCHI YASUHIDE , KUGIYA FUMIO
IPC分类号： G11B20/10 , G11B7/005 , G11B7/095
摘要： PROBLEM TO BE SOLVED: To provide a method for eliminating effectively waveform distortion of a reproduced signal caused by coma aberration generated by an tilted optical disk and an optical head in an optical disk device premised with interchangeability of disks.
SOLUTION: This method is an information reproducing method by which information recorded in an optical disk 1 is reproduced using an optical head 2 performing reproduction by irradiating with light spot and an equalizer 7 constituted of transversal filters having taps of three pieces or more, a specific region which is positioned at an inner periphery side and an outer periphery side of an optical disk for the light spot and in which a mark deviated in the peripheral direction is formed is reproduced, a tilt error signal of the optical disk 1 and the optical head 2 is obtained, tilting of the optical disk 1 and the optical head 2 is compensated base on this tilt error signal, and the information recorded on the optical disk 1 is reproduced.
COPYRIGHT: (C)2004,JPO

16. 发明专利

JPH09102102A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH09102102A
公开(公告)日：1997-04-15
申请号：JP25508695
申请日：1995-10-02
申请人： HITACHI LTD
发明人： HORI YOSUKE , OUCHI YASUHIDE
IPC分类号： G11B5/09 , G11B19/00
摘要： PROBLEM TO BE SOLVED: To reduce a data error of a magnetic disk device by always performing previously optimum recording compensation and equalizing the reproducing wave form to the change of temp. and air pressure in a head disk assembly(HDA). SOLUTION: A disk controller 116 sends amount of previously recorded compensating data, recording current data, cutoff frequency data of an analog prefilter to the setting register 107 of amount of previously recorded compensating, recording current setting register 109, the setting register 112 for the cutoff frequency of the analog prefilter, the setting register 117 for equalizing and a setting register 114 of wave-form equalizing coefficient by receiving temp. data generated from a temp. sensor 104 and an A/D converter 105.

17. 发明专利

JPH0896312A INFORMATION RECORDING AND REPRODUCING DEVICE AND SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPH0896312A
公开(公告)日：1996-04-12
申请号：JP7500995
申请日：1995-03-31
申请人： HITACHI LTD
发明人： SATO NAOKI , MITA SEIICHI , MIYAZAWA SHOICHI , TAKASHI TERUMI , HORI YOSUKE , WATABE YOSHIHISA , HIRANO AKIHIKO , MINOJIMA SATOSHI , MIYASAKA HIDEKI , NITTA TOSHIHIRO , HIRAI TOMOAKI , SHIMOKAWA RYUSHI , SHIDA KOJI , OUCHI YASUHIDE
IPC分类号： G11B5/035 , G11B5/09 , G11B20/10
摘要： PURPOSE: To easily optimize various parameters in a short time by applying a coefft. correcting circuit for a prescribed equalization circuit and an error detecting circuit, etc., to a signal processing circuit adaptable to high speed transfer or a magnetic recording and reproducing device. CONSTITUTION: An HDA 1 is equipped with a reproducing head 8 using a magneto-resistance effect element, a thin film recording head 9, a recording and reproducing preamplifier 11 and a magnetic disk 10, etc. At the time of recording information, a recording current to be inverted in response to information from a WSPC 2 is supplied via an R/WIC 11 to an IND head 9, and is recorded as magnetizing information on the disk 10 rotating at a fixed revolving speed. At the time of reproducing, the feeble magnetizing information detected by the MR head 8 is amplified via the R/WIC 11, and is outputted to an RSPC 3. A recording current for the IND head and a sense current for the MR head are controlled in size by the WSPC 2 and the RSPC 3, while rotating operation of the disk 10 and positioning operation of the IND head 9 and the MR head 8 on the disk 10 are controlled by an SRVC 5.

18. 发明专利

JPH05206872A METHOD AND DEVICE FOR OUTPUT SIGNAL DECODING 失效
公开(公告)号：JPH05206872A
公开(公告)日：1993-08-13
申请号：JP1281892
申请日：1992-01-28
申请人： HITACHI LTD
发明人： SAWAGUCHI HIDEKI , OUCHI YASUHIDE , SATO NAOKI , HORI YOSUKE
IPC分类号： G11B20/18 , G11B20/10 , H03M13/23 , H03M13/31 , H03M13/39 , H03M13/41 , H04L25/03 , H04L25/08
摘要： PURPOSE:To realize a Viterbi decoder capable of coping with high speed operation in simple and small-sized hardware construction. CONSTITUTION:By providing run length restriction for an input code train, the scale of a register 115 and a counter 400 of a device recording a maximum likelihood remaining train is minimized. By providing a coincidence circuit 401 detecting as the abnormality of an input signal a state not satisfying the run length conditions from the state of the counter 400 and stopping the operation of the counter 400 based on the circuit 401, a decoding operation is prevented from following up the abnormal signal. Immediately after this, an operation of initializing the remaining train in maximum likelihood estimation and a counted value associated with it is performed and a decoder is set to an optimum waiting state with respect to a normal input signal to automatically and quickly restore to the normal state. Then the abnormality of the input signal is judged and an operation of stopping the follow-up of the decoding operation to such abnormality or an operation of optimumly and quickly restore the decoding operation is performed.

19. 发明专利

JPH05159209A SIGNAL PROCESSING DEVICE 失效
公开(公告)号：JPH05159209A
公开(公告)日：1993-06-25
申请号：JP32439391
申请日：1991-12-09
申请人： HITACHI LTD
发明人： OKADA YUTAKA , SATO NAOKI , OUCHI YASUHIDE
IPC分类号： G11B5/09
摘要： PURPOSE:To perform optimum discrimination of data for an MR head, etc., having a nonlinear characteristic. CONSTITUTION:The signal processing device is provided with a bias setting circuit 1 into which an asymmetrical signal of an output of the MR head, etc., is inputted, a nonlinear correction circuit 2 for processing an output of the bias setting circuit 1 to perform nonlinear correction from the asymmetrical signal to a symmetrical signal and a data discriminator 3 for discriminating data from an output of the nonlinear correction circuit 2. In addition, a circuit for feeding back the signal to the bias setting circuit via a feedback circuit consisting of a 0-value error calculator 4 and a low pass filter 5, etc., is provided to constitute the device. Magnetic recording information read out by the MR head having the nonlinear characteristic can be reproduced at a low error rate. Consequently, the reliability of a magnetic recording device, etc., can be improved with great strides.

20. 发明专利

JPH041922A IN-SURFACE MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JPH041922A
公开(公告)日：1992-01-07
申请号：JP10030890
申请日：1990-04-18
申请人： HITACHI LTD
发明人： MATSUDA YOSHIFUMI , FUTAMOTO MASAAKI , KUGIYA FUMIO , MIYAMURA YOSHINORI , NAKAO TAKESHI , TAKANO KOJI , AKAGI KYO , SUZUKI MIKIO , OUCHI YASUHIDE
IPC分类号： G11B5/09 , G11B5/55 , G11B5/596 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738 , G11B5/74 , G11B5/82 , G11B5/855
摘要： PURPOSE:To prevent the spread of magnetization occurring at the boundary of inversion of magnetization and to improve the S/N of a medium at recording and reproduction by providing a recording part separated magnetically in the linear recording direction on an in-face magnetic film and performing the magnetic separation by means of the air or a nonmagnetic matter. CONSTITUTION:An in-face magnetic film 3 is magnetically separated in the linear recording direction by means of the grooves 5 or the nonmagnetic matters 6. This separated recording part is recorded with the assignment of a bit so that the boundary of the inversion of magnetization can be separated in the linear recording direction. Thus it is possible to prevent the spread of magnetization that is caused at the boundary of the inversion of magnetization and in the linear recording direction that is proper to a magnetic recording medium using the film 3. Thus, the medium noise can be reduced down to such a level as the DC erasing noise. Then the S/N of the medium is improved at record and reproduction.

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