WO1998038640A1 - Unite de traitement de signal numerique asservi, dispositif de reproduction de support d'enregistrement et support d'enregistrement - Google Patents

Unite de traitement de signal numerique asservi, dispositif de reproduction de support d'enregistrement et support d'enregistrement Download PDF

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Publication number
WO1998038640A1
WO1998038640A1 PCT/JP1998/000794 JP9800794W WO9838640A1 WO 1998038640 A1 WO1998038640 A1 WO 1998038640A1 JP 9800794 W JP9800794 W JP 9800794W WO 9838640 A1 WO9838640 A1 WO 9838640A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
digital
servo
analog
burst
Prior art date
Application number
PCT/JP1998/000794
Other languages
English (en)
Japanese (ja)
Inventor
Hiroshi Kimura
Takushi Nishiya
Takashi Nara
Tatsuya Komatsu
Seiichi Mita
Original Assignee
Hitachi, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi, Ltd. filed Critical Hitachi, Ltd.
Publication of WO1998038640A1 publication Critical patent/WO1998038640A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G11B21/10—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following
    • G11B21/106—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following on disks
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
    • G11B5/59605—Circuits
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
    • G11B5/59688—Servo signal format patterns or signal processing thereof, e.g. dual, tri, quad, burst signal patterns

Definitions

  • the present invention relates to a servo signal processing device.
  • digital disks that process servo signals digitally using an analog-to-digital converter for data signal processing on disk media such as magnetic disks and magneto-optical disks.
  • the present invention relates to a signal processing device, a disk medium reproducing device, and a disk medium.
  • a conventional digital servo signal processing device has a V G A
  • the conventional digital servo signal processing device shown in FIG. 22 includes a servo decoder 109, a servo address mark detection circuit 110, and a sequencer 111 for servo signal processing. In addition, it has an absolute value circuit 113, an adder 114, a latch circuit 117, and a register 112 for burst signal processing.
  • the sampling cycle of the burst signal is asynchronous with the burst signal, and the sampling of a servo signal other than the burst signal is performed.
  • the sample period may be switched so that the period is synchronized with the servo signal.
  • the distribution of the quantization error of each sample can be made uniform, thereby further suppressing the variation of the result of adding the burst signal.
  • the digital servo signal processing device of the present embodiment enters the data processing mode when the hard disk controller 8 does not output the servo gate 29.
  • the sequencer 11 does not output the burst start signal 28.
  • the analog switch 52 is in a state in which the filter 2—the analog switch 52—the analog-to-digital converter 3 is selected as the input path to the analog-to-digital converter 3. Therefore, the data signal read from the disk medium (not shown) is input to the analog / digital converter 3 via the VGA filter 2 and the analog switch 52.
  • the analog-to-digital converter 3 converts the received data signal into a signed digital signal.
  • the burst signal 155 is full-wave rectified by the analog full-wave rectifier circuit 50, amplified by the amplifier 51, and then input to the analog-to-digital converter 3 via the analog switch 52. Is done.
  • the quantization accuracy of the burst signal by the analog-to-digital converter can be improved by the number of code bits as compared with the conventional digital servo signal processing device. Further, a circuit for processing the absolute value of the quantized burst signal (the absolute value processing circuit 113 shown in FIG. 22) becomes unnecessary.
  • the T-type flip-flop 951 outputs a clock 960 obtained by dividing the clock Vin from the voltage controlled oscillator 23 by two.
  • the T-type flip-flop 952 further divides the output clock 960 of the T-type flip-flop 951 by 2 and outputs the 4-divided clock 962 as an output Vout (FIG. 5 (b ))).
  • the dynamic range of the analog-to-digital converter 3 is 0.5 V to +0.5 V except for burst signal processing, and is 0 V to 100.5 V for burst signal processing.
  • the dynamic range in the burst signal processing of the analog-to-digital converter 3 can be effectively used by setting the amplification factor of the amplifier 51 to one.
  • a description will be given of a quantization error when the burst signal is quantized by the analog-to-digital converter 3 and an improvement in quantization accuracy by switching the dynamic range.
  • the distribution of the quantization error at each sample point is obtained. Can be made uniform, so that the value of the average quantization error Eave can approach 0 [LSB].
  • FIG. 19 is a flowchart for explaining the servo control processing of the magnetic disk device shown in FIG. 17
  • the voice coil motor 653 is controlled by 6554 to move the head 651 (step 2011).
  • an IC chip is assigned to each of the constituent points, but all the constituent elements may be included in one chip or may be included in two or more chips.
  • the present invention it is possible to increase the quantization accuracy of a burst signal for specifying servo positioning information without increasing the number of bits of an analog-to-digital converter. Further, it is possible to suppress the result of addition of the burst signal due to the fluctuation of the sampling start timing of the burst signal, that is, the variation of the servo position error signal.

Abstract

Il est possible d'améliorer un signal asservi d'erreur de position sans augmenter le nombre de bits d'un convertisseur analogique-numérique. Un circuit redresseur pleine-onde analogique (50) et un commutateur analogique (52) sont raccordés à la sortie du filtre analogique (2) d'une unité de traitement de signaux et l'entrée du convertisseur analogique-numérique (3) est basculée par le commutateur analogique (52). Il s'ensuit que des signaux en rafale sont, d'abord introduits dans le convertisseur (3) après avoir été transformés en signaux pleine-onde redressés par le circuit redresseur pleine-onde (50), puis convertis en signaux numériques sans signe. Les signaux autres que les signaux en rafale, sont, d'autre part, introduits dans le convertisseur (3) sans passer par le circuit redresseur pleine-onde (50) et convertis en signaux numériques avec signe.
PCT/JP1998/000794 1997-02-27 1998-02-26 Unite de traitement de signal numerique asservi, dispositif de reproduction de support d'enregistrement et support d'enregistrement WO1998038640A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4373997A JPH10241307A (ja) 1997-02-27 1997-02-27 デジタルサーボ信号処理装置、ディスク媒体再生装置およびディスク媒体
JP9/43739 1997-02-27

Publications (1)

Publication Number Publication Date
WO1998038640A1 true WO1998038640A1 (fr) 1998-09-03

Family

ID=12672154

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1998/000794 WO1998038640A1 (fr) 1997-02-27 1998-02-26 Unite de traitement de signal numerique asservi, dispositif de reproduction de support d'enregistrement et support d'enregistrement

Country Status (2)

Country Link
JP (1) JPH10241307A (fr)
WO (1) WO1998038640A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5785913B2 (ja) * 2012-07-30 2015-09-30 日立コンシューマエレクトロニクス株式会社 光情報再生装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0620413A (ja) * 1992-07-02 1994-01-28 Sony Corp 磁気ディスク装置
JPH07141807A (ja) * 1993-11-19 1995-06-02 Toshiba Corp 磁気ディスク装置のサーボ処理装置とサーボ処理方法
JPH07192238A (ja) * 1993-11-23 1995-07-28 Internatl Business Mach Corp <Ibm> ディスク・ドライブ・サーボ制御装置
JPH08203226A (ja) * 1995-01-27 1996-08-09 Fujitsu Ltd 情報記憶装置の位置信号復調装置
JPH09312073A (ja) * 1996-05-23 1997-12-02 Fujitsu Ltd 位置信号復調方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0620413A (ja) * 1992-07-02 1994-01-28 Sony Corp 磁気ディスク装置
JPH07141807A (ja) * 1993-11-19 1995-06-02 Toshiba Corp 磁気ディスク装置のサーボ処理装置とサーボ処理方法
JPH07192238A (ja) * 1993-11-23 1995-07-28 Internatl Business Mach Corp <Ibm> ディスク・ドライブ・サーボ制御装置
JPH08203226A (ja) * 1995-01-27 1996-08-09 Fujitsu Ltd 情報記憶装置の位置信号復調装置
JPH09312073A (ja) * 1996-05-23 1997-12-02 Fujitsu Ltd 位置信号復調方法

Also Published As

Publication number Publication date
JPH10241307A (ja) 1998-09-11

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