JPS5612183A - Variable-speed controller of vtr - Google Patents

Variable-speed controller of vtr

Info

Publication number
JPS5612183A
JPS5612183A JP8685679A JP8685679A JPS5612183A JP S5612183 A JPS5612183 A JP S5612183A JP 8685679 A JP8685679 A JP 8685679A JP 8685679 A JP8685679 A JP 8685679A JP S5612183 A JPS5612183 A JP S5612183A
Authority
JP
Japan
Prior art keywords
speed
microcomputer
variable
signal
value
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
JP8685679A
Other languages
Japanese (ja)
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 JP8685679A priority Critical patent/JPS5612183A/en
Publication of JPS5612183A publication Critical patent/JPS5612183A/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
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/026—Control of operating function, e.g. switching from recording to reproducing by using processor, e.g. microcomputer
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/1808—Driving of both record carrier and head
    • G11B15/1875—Driving of both record carrier and head adaptations for special effects or editing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To realize the speed control of VTR by a microcomputer relatively slow in processing speed by setting the clock frequency of the microcomputer to the common divisor of the delay value of a false vertical synchronizing processing circuit. CONSTITUTION:Magnetic tape 1 is driven at a speed that corresponds to a set variable-speed magnifying rate. In this case, tracking operation is carried out by tracking servomechanism 7 so as to remove a noise band. A head start signal is included in an interruption input to microcomputer 12 and in an interruption processing routine, delaying is periodically done by a needed value that corresponds to the variable-speed magnifying rate to generate a false vertical synchronizing signal, which is added to a reproduced video signal. A servocontrol signal is also delayed by the microcomputer. Since an integer relation is born between the clock frequency and delay value, the delayed value is made accurate.
JP8685679A 1979-07-11 1979-07-11 Variable-speed controller of vtr Pending JPS5612183A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8685679A JPS5612183A (en) 1979-07-11 1979-07-11 Variable-speed controller of vtr

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8685679A JPS5612183A (en) 1979-07-11 1979-07-11 Variable-speed controller of vtr

Publications (1)

Publication Number Publication Date
JPS5612183A true JPS5612183A (en) 1981-02-06

Family

ID=13898447

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8685679A Pending JPS5612183A (en) 1979-07-11 1979-07-11 Variable-speed controller of vtr

Country Status (1)

Country Link
JP (1) JPS5612183A (en)

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