JPS5466812A - Magnetic recorder-reproducer - Google Patents

Magnetic recorder-reproducer

Info

Publication number
JPS5466812A
JPS5466812A JP13419077A JP13419077A JPS5466812A JP S5466812 A JPS5466812 A JP S5466812A JP 13419077 A JP13419077 A JP 13419077A JP 13419077 A JP13419077 A JP 13419077A JP S5466812 A JPS5466812 A JP S5466812A
Authority
JP
Japan
Prior art keywords
bias current
outputs
oscillator
recording
circuit
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.)
Granted
Application number
JP13419077A
Other languages
Japanese (ja)
Other versions
JPS5822805B2 (en
Inventor
Hidemasa Kitagawa
Takuyo Kogure
Toshiyuki Goto
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 JP13419077A priority Critical patent/JPS5822805B2/en
Publication of JPS5466812A publication Critical patent/JPS5466812A/en
Publication of JPS5822805B2 publication Critical patent/JPS5822805B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To perform bias current adjustment rapidly by controlling bias current according to the changes in the reproduction signal level at the simultaneous recording and reproducing to a tape.
CONSTITUTION: The reference signal of a specified frequency which a reference signal oscillator 8 outputs is applied together with the bias current which a bias oscillator 9 outputs to a recording head 4 and is recorded in a magnetic tape 20. This recording is immediately reproduced with a playback head 10 and is converted to a d.c. voltage by a rectifier 12 and smoothing circuit 13, after which it is applied to a differentiation circuit 14. This causes the oscillator 9 whose level becomes constant to be adjusted by the differential signal according to the variations of the reproduction level which the circuit 14 outputs. Hence, rapid and sure automatic adjustment is performed so as to provide an optimum bias current value.
COPYRIGHT: (C)1979,JPO&Japio
JP13419077A 1977-11-08 1977-11-08 magnetic recording and reproducing device Expired JPS5822805B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13419077A JPS5822805B2 (en) 1977-11-08 1977-11-08 magnetic recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13419077A JPS5822805B2 (en) 1977-11-08 1977-11-08 magnetic recording and reproducing device

Publications (2)

Publication Number Publication Date
JPS5466812A true JPS5466812A (en) 1979-05-29
JPS5822805B2 JPS5822805B2 (en) 1983-05-11

Family

ID=15122530

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13419077A Expired JPS5822805B2 (en) 1977-11-08 1977-11-08 magnetic recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS5822805B2 (en)

Also Published As

Publication number Publication date
JPS5822805B2 (en) 1983-05-11

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