JPS56119957A - Magnetic tape discriminating system - Google Patents

Magnetic tape discriminating system

Info

Publication number
JPS56119957A
JPS56119957A JP2389780A JP2389780A JPS56119957A JP S56119957 A JPS56119957 A JP S56119957A JP 2389780 A JP2389780 A JP 2389780A JP 2389780 A JP2389780 A JP 2389780A JP S56119957 A JPS56119957 A JP S56119957A
Authority
JP
Japan
Prior art keywords
bias current
magnetic tape
signal
reproduced
maximum 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
JP2389780A
Other languages
Japanese (ja)
Inventor
Takashi Nishida
Masao Ikeda
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP2389780A priority Critical patent/JPS56119957A/en
Publication of JPS56119957A publication Critical patent/JPS56119957A/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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/027—Analogue recording
    • G11B5/03—Biasing

Abstract

PURPOSE:To discriminate the kind of a magnetic tape by reproducing the magnetic tape which has been recorded while bias current values are being changed and detecting the bias current values at which the reproduced signal assumes a maximum value and assumes a value decreased by a fixed rate from the maximum value, respectively. CONSTITUTION:A change-over switch 3 is shifted to the side B, and the signal of a suitable frequency is oscillated from an oscilltor 6. This signal is applied to a synthesizing circuit 4, where it is superposed or the bias current applied by a biasing circuit 7, and the superposed signal is recorded with a recording heads. This bias current is changed. The change of this bias current is executed by controlling the bias circuit 7 by a microcomputer 12. The magnetic tape recorded while the bias current is being changed is reproduced with a playback head 8, and the reproduced signal obtained with an amplifier and a playback equalizer 9 is read into the microcomputer. Both of the bias current value at which the reproduced output assumes a maximum value and the bias current value at which the reproduced output assumes 1/2 the maximum value are detected, whereby the kind of the magnetic tape is discriminated.
JP2389780A 1980-02-26 1980-02-26 Magnetic tape discriminating system Pending JPS56119957A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2389780A JPS56119957A (en) 1980-02-26 1980-02-26 Magnetic tape discriminating system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2389780A JPS56119957A (en) 1980-02-26 1980-02-26 Magnetic tape discriminating system

Publications (1)

Publication Number Publication Date
JPS56119957A true JPS56119957A (en) 1981-09-19

Family

ID=12123242

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2389780A Pending JPS56119957A (en) 1980-02-26 1980-02-26 Magnetic tape discriminating system

Country Status (1)

Country Link
JP (1) JPS56119957A (en)

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