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JPS57183671A - Tracking control circuit - Google Patents

Tracking control circuit

Info

Publication number
JPS57183671A
JPS57183671A JP56068335A JP6833581A JPS57183671A JP S57183671 A JPS57183671 A JP S57183671A JP 56068335 A JP56068335 A JP 56068335A JP 6833581 A JP6833581 A JP 6833581A JP S57183671 A JPS57183671 A JP S57183671A
Authority
JP
Japan
Prior art keywords
circuit
signal
noise
produced
loop
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP56068335A
Other languages
Japanese (ja)
Inventor
Kyo Yamashita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
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
Priority to JP56068335A priority Critical patent/JPS57183671A/en
Publication of JPS57183671A publication Critical patent/JPS57183671A/en
Pending legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Control Of Position Or Direction (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)

Abstract

PURPOSE:To prevent the malfunction of a control circuit, by lowering the response to a high band signal of a loop while the noise is produced into the tracking position detection signal. CONSTITUTION:Only the high frequency component excluding the rotary period component is extracted out of the signal of a track position detecting circuit 6 through an HPF9. Then the noises generated from the signal with the positive and minus properties and having the level higher than the prescribed value are detected by threshold circuits 10 and 11. The pulses corresponding to these noises are produced, and the output pulses are added 12 together to perform the ON/OFF control of a switch circuit 13. The circuit 13 varies the frequency characteristics of a phase compensating circuit 14. Accordingly no noise is detected in the track position detection signal, and the open loop frequency characteristics of a tracking loop works with the characteristics (a) while the circuit 13 is open. The response of a high band lowers like the characteristics (b) while the noise is produced with the closed circuit 13.
JP56068335A 1981-05-08 1981-05-08 Tracking control circuit Pending JPS57183671A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56068335A JPS57183671A (en) 1981-05-08 1981-05-08 Tracking control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56068335A JPS57183671A (en) 1981-05-08 1981-05-08 Tracking control circuit

Publications (1)

Publication Number Publication Date
JPS57183671A true JPS57183671A (en) 1982-11-12

Family

ID=13370865

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56068335A Pending JPS57183671A (en) 1981-05-08 1981-05-08 Tracking control circuit

Country Status (1)

Country Link
JP (1) JPS57183671A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58188339A (en) * 1982-04-26 1983-11-02 Sony Corp Optical reproducer
EP0160095A1 (en) * 1983-09-30 1985-11-06 Sony Corporation Tracking servo circuit for optical disk

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58188339A (en) * 1982-04-26 1983-11-02 Sony Corp Optical reproducer
JPH0423331B2 (en) * 1982-04-26 1992-04-22 Sony Corp
EP0160095A1 (en) * 1983-09-30 1985-11-06 Sony Corporation Tracking servo circuit for optical disk
US4703468A (en) * 1983-09-30 1987-10-27 Sony Corporation Optical disc tracking servo circuit having compensation for disc defects and external disturbances

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