JPS5517859A - Magnetic recording device - Google Patents

Magnetic recording device

Info

Publication number
JPS5517859A
JPS5517859A JP9024778A JP9024778A JPS5517859A JP S5517859 A JPS5517859 A JP S5517859A JP 9024778 A JP9024778 A JP 9024778A JP 9024778 A JP9024778 A JP 9024778A JP S5517859 A JPS5517859 A JP S5517859A
Authority
JP
Japan
Prior art keywords
recording
detection points
data
bridge
head
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
JP9024778A
Other languages
Japanese (ja)
Inventor
Tetsushi Asada
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.)
EASTERN ELECTRIC KK
Original Assignee
EASTERN ELECTRIC KK
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 EASTERN ELECTRIC KK filed Critical EASTERN ELECTRIC KK
Priority to JP9024778A priority Critical patent/JPS5517859A/en
Publication of JPS5517859A publication Critical patent/JPS5517859A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent an erroneous erase of necessary recorded data by detecting whether data has been already recorded on a tape used for recording or not through a balanced bridge circuit where a recording and reproducing head is one side.
CONSTITUTION: When a balanced bridge is formed by resistance RC, capacitor CP, variable resistance VR, etc., according to the impedance of recording and reproducing head RPH, signal G1 which passed through a recording amplifier is not generated at bridge detection points P1 and P2. Meanwhile, in case that data has been already reacorded on a part of the magnetic tape, the bridge becomes unbalanced due to the reproducing output of head RPH, and signals are generated at detection points P1 and P2. Consequently, if recording is performed after the erasing head is driven while monitoring the output of detection points P1 and P2, necessary recorded data is not erased erroneously to perform a good recording.
COPYRIGHT: (C)1980,JPO&Japio
JP9024778A 1978-07-24 1978-07-24 Magnetic recording device Pending JPS5517859A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9024778A JPS5517859A (en) 1978-07-24 1978-07-24 Magnetic recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9024778A JPS5517859A (en) 1978-07-24 1978-07-24 Magnetic recording device

Publications (1)

Publication Number Publication Date
JPS5517859A true JPS5517859A (en) 1980-02-07

Family

ID=13993163

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9024778A Pending JPS5517859A (en) 1978-07-24 1978-07-24 Magnetic recording device

Country Status (1)

Country Link
JP (1) JPS5517859A (en)

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