JPS57131050A - Evaluation apparatus for magnetic tape - Google Patents

Evaluation apparatus for magnetic tape

Info

Publication number
JPS57131050A
JPS57131050A JP1731981A JP1731981A JPS57131050A JP S57131050 A JPS57131050 A JP S57131050A JP 1731981 A JP1731981 A JP 1731981A JP 1731981 A JP1731981 A JP 1731981A JP S57131050 A JPS57131050 A JP S57131050A
Authority
JP
Japan
Prior art keywords
signal
recording
magnetic tape
fed
exfoliation
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
JP1731981A
Other languages
Japanese (ja)
Inventor
Makoto Kosugi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP1731981A priority Critical patent/JPS57131050A/en
Publication of JPS57131050A publication Critical patent/JPS57131050A/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
    • G11B5/008—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To detect the exfoliation of a magnetic tape, by a method wherein the signal recorded in one field of the magnetic tape is played back in two fields and subjected to the envelope detection, and the detection signal and a reference signal are compared with each other. CONSTITUTION:A pulse obtained from a position detecting head 16 for detecting the recording-playback position is fed to a control circuit 21. The head changeover signal 21A obtained is fed to a recording circuit 22. The recording start signal 20A obtained by making a recording switch 20 ON is fed to the recording circuit 22 and further supplied through a head changeover gate 30 to video heads 13, 14 to record a signal only for one field. Next, with a switch SW19 connected to the playback side, the same signal is alternately played back by the video heads 13, 14 for one field respectively and subjected to the envelope detection. A detection signal 34A is compared with a reference signal 36A for setting an exfoliation level. A comparison output 37A monitors at all times. When exfoliation occurs, an alarm circuit 38 is actuted.
JP1731981A 1981-02-06 1981-02-06 Evaluation apparatus for magnetic tape Pending JPS57131050A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1731981A JPS57131050A (en) 1981-02-06 1981-02-06 Evaluation apparatus for magnetic tape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1731981A JPS57131050A (en) 1981-02-06 1981-02-06 Evaluation apparatus for magnetic tape

Publications (1)

Publication Number Publication Date
JPS57131050A true JPS57131050A (en) 1982-08-13

Family

ID=11940698

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1731981A Pending JPS57131050A (en) 1981-02-06 1981-02-06 Evaluation apparatus for magnetic tape

Country Status (1)

Country Link
JP (1) JPS57131050A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5538726A (en) * 1978-09-08 1980-03-18 Nec Corp Microwave oscillation device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5538726A (en) * 1978-09-08 1980-03-18 Nec Corp Microwave oscillation device

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