WO2002029788A1 - Disk unit - Google Patents

Disk unit Download PDF

Info

Publication number
WO2002029788A1
WO2002029788A1 PCT/JP2001/008737 JP0108737W WO0229788A1 WO 2002029788 A1 WO2002029788 A1 WO 2002029788A1 JP 0108737 W JP0108737 W JP 0108737W WO 0229788 A1 WO0229788 A1 WO 0229788A1
Authority
WO
WIPO (PCT)
Prior art keywords
control voltage
peak level
vca
fcm signal
gain corresponding
Prior art date
Application number
PCT/JP2001/008737
Other languages
French (fr)
Japanese (ja)
Inventor
Koichi Tada
Toshihide Hamaguchi
Tadashi Okajima
Original Assignee
Sanyo Electric Co., 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 Sanyo Electric Co., Ltd. filed Critical Sanyo Electric Co., Ltd.
Publication of WO2002029788A1 publication Critical patent/WO2002029788A1/en

Links

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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/10556—Disposition or mounting of transducers relative to record carriers with provision for moving or switching or masking the transducers in or out of their operative position
    • G11B11/10563—Access of indexed parts
    • G11B11/10565—Marks for track change, e.g. prepits, gray codes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/00745—Sectoring or header formats within a track

Abstract

A disk unit (10) including a VCA (36) to which a first control voltage and a second control voltage are applied at different timings. The VCA (36) amplifies an FCM signal at a gain corresponding to an applied control voltage, the peak level of the amplified FCM signal being detected by a peak-hold circuit (38). A DSP (44) calculates an optimum control voltage providing an optimum peak level based on the peak level of an FCM signal to which a gain corresponding to the first control voltage is assigned and on the peak level of an FCM signal to which a gain corresponding to the second control voltage is assigned. Then, the calculated optimum control voltage is applied to the VCA (36).
PCT/JP2001/008737 2000-10-05 2001-10-03 Disk unit WO2002029788A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000305610A JP2002117535A (en) 2000-10-05 2000-10-05 Disk device
JP2000-305610 2000-10-05

Publications (1)

Publication Number Publication Date
WO2002029788A1 true WO2002029788A1 (en) 2002-04-11

Family

ID=18786435

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/008737 WO2002029788A1 (en) 2000-10-05 2001-10-03 Disk unit

Country Status (2)

Country Link
JP (1) JP2002117535A (en)
WO (1) WO2002029788A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0982031A (en) * 1995-09-14 1997-03-28 Sony Corp Apparatus and method for gain control as well as reproducing apparatus
WO1998054703A1 (en) * 1997-05-28 1998-12-03 Sanyo Electric Co., Ltd. Recording medium and reproducing apparatus therefor
WO1999040576A1 (en) * 1998-02-06 1999-08-12 Sanyo Electric Co., Ltd. Optical disc device
JPH11306686A (en) * 1998-04-21 1999-11-05 Sony Corp Signal processing circuit
WO2001088907A1 (en) * 2000-05-19 2001-11-22 Sanyo Electric Co., Ltd. Disk reproducing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0982031A (en) * 1995-09-14 1997-03-28 Sony Corp Apparatus and method for gain control as well as reproducing apparatus
WO1998054703A1 (en) * 1997-05-28 1998-12-03 Sanyo Electric Co., Ltd. Recording medium and reproducing apparatus therefor
WO1999040576A1 (en) * 1998-02-06 1999-08-12 Sanyo Electric Co., Ltd. Optical disc device
JPH11306686A (en) * 1998-04-21 1999-11-05 Sony Corp Signal processing circuit
WO2001088907A1 (en) * 2000-05-19 2001-11-22 Sanyo Electric Co., Ltd. Disk reproducing device

Also Published As

Publication number Publication date
JP2002117535A (en) 2002-04-19

Similar Documents

Publication Publication Date Title
ATE320015T1 (en) DEVICE FOR DETECTING APPROACHES
WO2006107841A3 (en) Dynamic gain and phase compensation for power amplifier load switching
EP0786859A3 (en) Power amplifying circuit and method
MXPA04009306A (en) Gain control for communications device.
EP1137174A3 (en) Automatic gain control system
WO2003017477A3 (en) Method and apparatus for protecting devices in an rf power amplifier
WO2002084864A3 (en) Communications signal amplifiers having independent power control and amplitude modulation
WO2006017042A3 (en) Column amplifier with automatic gain selection for cmos image sensors
WO2002043253A3 (en) A radio receiver
DE69712801T2 (en) DYNAMIC AUTOMATIC AMPLIFIER CONTROL IN A HEARING AID
WO2001074000A8 (en) Low-power cdma receiver
WO2001067593A3 (en) Improved method and apparatus for improving the efficiency of power amplifiers, operating under a large peak-to-average ratio
EP1615337A4 (en) Transmission amplifier
WO2002036197A3 (en) Method and system for measuring a source impedance of at least one cardiac electrical signal in a mammalian heart
WO2003075452A3 (en) Method of adjusting gain and current consumption of a power amplifier circuit while maintaining linearity
EP1193861A3 (en) Feedforward amplifier
WO2001058014A3 (en) Measuring antenna signal strength with automatic gain control receiver
TW200509620A (en) Automatic gain control circuit for signal receiving device for moving body, amplifying circuit with an automatic gain control circuit, integrated circuit, and method for automatic gain control of signal receiving device for moving body
WO1996038907A3 (en) If amplifiers/limiters
WO2002029788A1 (en) Disk unit
AU2003302801A1 (en) Preserving linearity of an isolator-free power amplifier by dynamically switching active devices
WO2001056453A3 (en) Ultrasonic monitor
WO2004109938A3 (en) Optical receiver having an open loop automatic gain control circuit
CA2079129A1 (en) Power amplifying circuit capable of producing an output signal having a desired waveform
JPS56116313A (en) Two signal amplifier

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CN KR US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): DE FR GB

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase