JPS57118484A - Continuous variable picture reproducer - Google Patents

Continuous variable picture reproducer

Info

Publication number
JPS57118484A
JPS57118484A JP56003768A JP376881A JPS57118484A JP S57118484 A JPS57118484 A JP S57118484A JP 56003768 A JP56003768 A JP 56003768A JP 376881 A JP376881 A JP 376881A JP S57118484 A JPS57118484 A JP S57118484A
Authority
JP
Japan
Prior art keywords
displacement
video head
outputs
reproduced
signal
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
JP56003768A
Other languages
Japanese (ja)
Other versions
JPS6347028B2 (en
Inventor
Nobuo Azuma
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 JP56003768A priority Critical patent/JPS57118484A/en
Publication of JPS57118484A publication Critical patent/JPS57118484A/en
Publication of JPS6347028B2 publication Critical patent/JPS6347028B2/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

Landscapes

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

Abstract

PURPOSE:To realize the matching of tracking, by tracing the recording track by giving a displacement to a video head with an inclination according to the tape travelling speed and giving an up- or down-displacement to the video head when a shift is caused to the tracking with a reduction of the reproduced signal level. CONSTITUTION:The output frequency (f) of a frequency generator attached to the shaft of a capstan motor is converted into the DC voltage through an fV converter 12 to produce the sawtooth wave through a waveform generating circuit 12. On the other hand, a reproduction signal (e) obtained from a video head is compared with the prescribed voltage which is supplied in accordance with a switch signal SW that produces an envelope through a reproduced envelope detecting circuit 14 and is supplied to comparators 16 and 16' to give a switching action to the video head with 30Hz. When the reproduced level signal is lower than the prescribed voltage, the outputs (b) and (b') are produced from differ- entiating circuits 17 and 17' to invert T flip-flops 18 and 18'. Then track pitch displacement outputs V1 and V1' are added to the waveform generation output V0 when the Q outputs of the flip-flops 18 and 18'. thus a head displacement output is produced to the bimorph from high voltage amplifiers 13 and 13'.
JP56003768A 1981-01-16 1981-01-16 Continuous variable picture reproducer Granted JPS57118484A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56003768A JPS57118484A (en) 1981-01-16 1981-01-16 Continuous variable picture reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56003768A JPS57118484A (en) 1981-01-16 1981-01-16 Continuous variable picture reproducer

Publications (2)

Publication Number Publication Date
JPS57118484A true JPS57118484A (en) 1982-07-23
JPS6347028B2 JPS6347028B2 (en) 1988-09-20

Family

ID=11566341

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56003768A Granted JPS57118484A (en) 1981-01-16 1981-01-16 Continuous variable picture reproducer

Country Status (1)

Country Link
JP (1) JPS57118484A (en)

Also Published As

Publication number Publication date
JPS6347028B2 (en) 1988-09-20

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