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JPS57123515A - Magnetic tape device - Google Patents

Magnetic tape device

Info

Publication number
JPS57123515A
JPS57123515A JP19681381A JP19681381A JPS57123515A JP S57123515 A JPS57123515 A JP S57123515A JP 19681381 A JP19681381 A JP 19681381A JP 19681381 A JP19681381 A JP 19681381A JP S57123515 A JPS57123515 A JP S57123515A
Authority
JP
Japan
Prior art keywords
output
signal
circuit
sent
read instruction
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
JP19681381A
Other languages
Japanese (ja)
Inventor
Yoshihisa Kamo
Zenji Dai
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 JP19681381A priority Critical patent/JPS57123515A/en
Publication of JPS57123515A publication Critical patent/JPS57123515A/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
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1816—Testing

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Digital Magnetic Recording (AREA)

Abstract

PURPOSE:To perform processing without causing important trouble, by providing a means of detecting whether a signal varies in amplitude within a prescribed period after the start of a backward run. CONSTITUTION:A backward read instruction and the output of a signal amplitude detecting circuit are used and when the backward read instruction is sent, a monostable multivibrator 10 and a pulse generating circuit 12 output a detection pulse to a line 120 within a constant time after the backward read instruction is generated. On the other hand, a monostable multivibrator 22 generates a pulse with constant time width similarly from the output of a signal-amplitude detecting circuit 20 and if signal amplitude is not detected until the generation of the detection pulse, an FF40 is set with the detection pulse through the operation of an inverter 20 and an AND circuit 30, judging that the device has fault. The output of the FF40 is inputted to an encoder circuit 50 together with a signal of a check on another device sent from a line 700, and its output is sent to a CPU70 through a channel 60.
JP19681381A 1981-12-09 1981-12-09 Magnetic tape device Pending JPS57123515A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19681381A JPS57123515A (en) 1981-12-09 1981-12-09 Magnetic tape device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19681381A JPS57123515A (en) 1981-12-09 1981-12-09 Magnetic tape device

Publications (1)

Publication Number Publication Date
JPS57123515A true JPS57123515A (en) 1982-08-02

Family

ID=16364078

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19681381A Pending JPS57123515A (en) 1981-12-09 1981-12-09 Magnetic tape device

Country Status (1)

Country Link
JP (1) JPS57123515A (en)

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