JPS57138030A - Automatic tracking device for magnetic recorder and reproducer - Google Patents

Automatic tracking device for magnetic recorder and reproducer

Info

Publication number
JPS57138030A
JPS57138030A JP56023005A JP2300581A JPS57138030A JP S57138030 A JPS57138030 A JP S57138030A JP 56023005 A JP56023005 A JP 56023005A JP 2300581 A JP2300581 A JP 2300581A JP S57138030 A JPS57138030 A JP S57138030A
Authority
JP
Japan
Prior art keywords
signal
amplitude
head
automatic tracking
switching
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
JP56023005A
Other languages
Japanese (ja)
Inventor
Makoto Shiomi
Akimichi Terada
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 JP56023005A priority Critical patent/JPS57138030A/en
Publication of JPS57138030A publication Critical patent/JPS57138030A/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
    • 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

Landscapes

  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Control Of Position Or Direction (AREA)

Abstract

PURPOSE:To achieve excellent automatic tracking, by synchronizing the amplitude of a wobbling signal to a switching period of a magnetic head and increasing the amplitude near a switching point. CONSTITUTION:When a head switching signal in 30Hz is applied to a PLL10 and the like, a sinusoidal wave (f0) in 60Hz synchronized with a head switching timing is outputted from a PLL11. A signal in fundamental frequency (f) is amplitude-modulated with the sinusoidal wave (f0) at an amplitude modulator 12. Thus, the signal becomes a modulated wobbling signal modulaed in 60Hz to wobble a reproducing head. The amplitude of envelope change in the fundamental frequency (f) is maximum at a switching point (t) of a reproducing magnetic head 1, and a trcking error signal is obtained by passing through this change to a synchronizing detecting circuit 6 and the like. This signal is superimposed on a modulation wobbling signal at an adder 9 via a phase compensating circuit 8 to control the position of the head 1 so that it comes to the center of the recording track. Thus, excellent automatic tracking can be made.
JP56023005A 1981-02-20 1981-02-20 Automatic tracking device for magnetic recorder and reproducer Pending JPS57138030A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56023005A JPS57138030A (en) 1981-02-20 1981-02-20 Automatic tracking device for magnetic recorder and reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56023005A JPS57138030A (en) 1981-02-20 1981-02-20 Automatic tracking device for magnetic recorder and reproducer

Publications (1)

Publication Number Publication Date
JPS57138030A true JPS57138030A (en) 1982-08-26

Family

ID=12098378

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56023005A Pending JPS57138030A (en) 1981-02-20 1981-02-20 Automatic tracking device for magnetic recorder and reproducer

Country Status (1)

Country Link
JP (1) JPS57138030A (en)

Similar Documents

Publication Publication Date Title
US4392219A (en) Method and device for recording and reproducing tracking information
ES8305143A1 (en) Apparatus for inscribing and/or reading a record carrier.
JPS55150138A (en) Controller for light beam position
EP0367378A3 (en) Digital phase locked loop
EP1191530A3 (en) Optical disk device
GB1530811A (en) Optical recording
AU579609B2 (en) Vtr
EP0184357A3 (en) An apparatus for determining the magnitude of phase discontinuities introduced into a received signal at known instants
JPS6035860B2 (en) Synchronous monitor circuit
EP0335346A3 (en) Digital signal magnetic recording and playback apparatus employing quadrature amplitude modulation
ATE104490T1 (en) CLOCK EXTRACTOR WITH DIGITAL PHASE-LOCKED LOOP FOR BIPOLAR SIGNALS.
KR850003029A (en) Device for digital information reproduction
JPS57138030A (en) Automatic tracking device for magnetic recorder and reproducer
EP0335748A3 (en) Recording mode identifying circuit and a reproducing apparatus comprising the same
JPS57200969A (en) Jitter correcting circuit of reproducing device for disk-like information recording medium
KR890001034A (en) Optical wavelength multiple recorder
ES2193332T3 (en) PLAYBACK OF DIGITAL SIGNS.
JPS57181432A (en) Optical type disc reproducer
KR100239830B1 (en) Apparatus for reproducing address data on a disc
JPS56117328A (en) Information reproducing device
JPS53118012A (en) Automatic tracking device
JP2529238B2 (en) Clock signal reproduction device
JPS6419565A (en) Information recording and reproducing device
JPH0380462A (en) Signal recording device and signal reproducing device
JPS57152508A (en) Address reproducing system of pcm recording and reproducing device