JPS57143724A - Track shift detection system - Google Patents

Track shift detection system

Info

Publication number
JPS57143724A
JPS57143724A JP56027842A JP2784281A JPS57143724A JP S57143724 A JPS57143724 A JP S57143724A JP 56027842 A JP56027842 A JP 56027842A JP 2784281 A JP2784281 A JP 2784281A JP S57143724 A JPS57143724 A JP S57143724A
Authority
JP
Japan
Prior art keywords
signal
head
reproducing
video signal
track
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.)
Granted
Application number
JP56027842A
Other languages
Japanese (ja)
Other versions
JPS6321970B2 (en
Inventor
Masahiko Tsuruta
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.)
Victor Company of Japan Ltd
Nippon Victor KK
Original Assignee
Victor Company of Japan Ltd
Nippon Victor KK
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 Victor Company of Japan Ltd, Nippon Victor KK filed Critical Victor Company of Japan Ltd
Priority to JP56027842A priority Critical patent/JPS57143724A/en
Priority to US06/347,395 priority patent/US4470079A/en
Priority to FR8202331A priority patent/FR2500243B1/fr
Priority to GB8204425A priority patent/GB2096801B/en
Priority to DE19823205278 priority patent/DE3205278A1/en
Publication of JPS57143724A publication Critical patent/JPS57143724A/en
Publication of JPS6321970B2 publication Critical patent/JPS6321970B2/ja
Granted 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
    • G11B5/584—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 tapes
    • G11B5/588—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 tapes by controlling the position of the rotating heads
    • G11B5/592—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 tapes by controlling the position of the rotating heads using bimorph elements supporting the heads

Abstract

PURPOSE:To exactly detect a track shift and to execute a tracking control, by displacing a rotary head in the track width direction, and detecting a reproducing signal level, synchronizing with rotation of the rotary head and a horizontal synchronizing signal of a reproducing video signal. CONSTITUTION:An FM reproducing signal 3 is supplied to a sampling circuit 7 through an envelope detector 6, and by a sampling pulse synchronizing with not only rotation of a rotary head from a pulse generator 8 but also a horizontal synchronizing signal of a reproducing video signal, by a reproducing video signal 4 and a drum pulse 5, a video signal level of N parts is sampled from one recording track and is provided to a memory 10. On the other hand, the pulse generating circuit 8 applies a head rocking signal of 2 fields to a head moving mechanism 16 through an adder 14 and a driving amplifier 15, and rocks the head in the track width direction. Data of the upper and lower displacement positions are compared through a system controller 9, and its output provided to a tracking signal generating circuit 13. In this way, a track shift is detected exactly, and the tracking control is executed.
JP56027842A 1981-02-13 1981-02-27 Track shift detection system Granted JPS57143724A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP56027842A JPS57143724A (en) 1981-02-27 1981-02-27 Track shift detection system
US06/347,395 US4470079A (en) 1981-02-13 1982-02-10 Tracking control system in a magnetic recording and reproducing apparatus
FR8202331A FR2500243B1 (en) 1981-02-13 1982-02-12
GB8204425A GB2096801B (en) 1981-02-13 1982-02-15 Tracking control system in a magnetic recording and reproducing apparatus
DE19823205278 DE3205278A1 (en) 1981-02-13 1982-02-15 TRACK CONTROL ARRANGEMENT FOR A MAGNETIC RECORDING AND PLAYBACK DEVICE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56027842A JPS57143724A (en) 1981-02-27 1981-02-27 Track shift detection system

Publications (2)

Publication Number Publication Date
JPS57143724A true JPS57143724A (en) 1982-09-06
JPS6321970B2 JPS6321970B2 (en) 1988-05-10

Family

ID=12232163

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56027842A Granted JPS57143724A (en) 1981-02-13 1981-02-27 Track shift detection system

Country Status (1)

Country Link
JP (1) JPS57143724A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58189820A (en) * 1982-04-02 1983-11-05 アムペックス　コーポレーション Automatically scan tracking servo apparatus magnetic tape recorder/reproducer

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5340159A (en) * 1991-07-12 1994-08-23 The Standard Register Company Varying tone security document
JPH0671156U (en) * 1993-03-26 1994-10-04 株式会社細川活版所 Latent image dazzling copy anti-counterfeit paper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58189820A (en) * 1982-04-02 1983-11-05 アムペックス　コーポレーション Automatically scan tracking servo apparatus magnetic tape recorder/reproducer

Also Published As

Publication number Publication date
JPS6321970B2 (en) 1988-05-10

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