JPS5654617A - Automatic gain control system - Google Patents

Automatic gain control system

Info

Publication number
JPS5654617A
JPS5654617A JP13020779A JP13020779A JPS5654617A JP S5654617 A JPS5654617 A JP S5654617A JP 13020779 A JP13020779 A JP 13020779A JP 13020779 A JP13020779 A JP 13020779A JP S5654617 A JPS5654617 A JP S5654617A
Authority
JP
Japan
Prior art keywords
playback
region
agc
detection
automatic control
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
JP13020779A
Other languages
Japanese (ja)
Other versions
JPH0230109B2 (en
Inventor
Akira Kanamori
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP13020779A priority Critical patent/JPS5654617A/en
Publication of JPS5654617A publication Critical patent/JPS5654617A/en
Publication of JPH0230109B2 publication Critical patent/JPH0230109B2/ja
Granted 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

Landscapes

  • Digital Magnetic Recording (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE:To realize an automatic control for the proper playback amplification gain although a local defect may occur to the AGC region, by having a retrial through an automatic shift of the detector in case when some error arises to the reference signal caused through detection of the AGC region of the magnetic recording medium having the oblique and parallel tracks. CONSTITUTION:The prescribed playback level control is carried out through the detection of the AGC region 2 of the magnetic tape 1 having the oblique and parallel tracks 3 before the recording and playback and then an automatic control given to the gain of the playback amplifier 15 via the AGC circuit 16 and in accordance with the playback reference signal. In case when the local defect 21 exists at the strip 221 of the region 2 and the circuit 16 detects the error when the region 2 is detected, the tape 1 is shifted by a prescribed extent via the driving circuit 17 and the motor 18. And then the retrial detection is carried out through the strip 222. As a result, an automatic control is secured for the playback amplifier to obtain the proper playback gain althrough the local defect may arise in the AGC region due to the abrasion, the sticking of dust and the like factors.
JP13020779A 1979-10-09 1979-10-09 Automatic gain control system Granted JPS5654617A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13020779A JPS5654617A (en) 1979-10-09 1979-10-09 Automatic gain control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13020779A JPS5654617A (en) 1979-10-09 1979-10-09 Automatic gain control system

Publications (2)

Publication Number Publication Date
JPS5654617A true JPS5654617A (en) 1981-05-14
JPH0230109B2 JPH0230109B2 (en) 1990-07-04

Family

ID=15028645

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13020779A Granted JPS5654617A (en) 1979-10-09 1979-10-09 Automatic gain control system

Country Status (1)

Country Link
JP (1) JPS5654617A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS647367A (en) * 1987-03-31 1989-01-11 Canon Kk Method and device for recording information
JPH0322237U (en) * 1989-07-14 1991-03-07

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49123743A (en) * 1973-03-31 1974-11-27
JPS5280111A (en) * 1975-12-26 1977-07-05 Casio Comput Co Ltd Magnetic tape controlling system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49123743A (en) * 1973-03-31 1974-11-27
JPS5280111A (en) * 1975-12-26 1977-07-05 Casio Comput Co Ltd Magnetic tape controlling system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS647367A (en) * 1987-03-31 1989-01-11 Canon Kk Method and device for recording information
JPH0322237U (en) * 1989-07-14 1991-03-07

Also Published As

Publication number Publication date
JPH0230109B2 (en) 1990-07-04

Similar Documents

Publication Publication Date Title
DE3279404D1 (en) Editing control methods and apparatus for video tape recorders
EP0096406A3 (en) Variable speed picture reproducing apparatus for video tape recorder
JPS56119917A (en) Track deviation detecting system in magnetic recording and reproducing device
JPS5634175A (en) Recording and detection apparatus for cue signal
JPS54156610A (en) Inspecting method of magnetic recording tapes
JPS5654617A (en) Automatic gain control system
CA2026987A1 (en) Cue signal recording and detection system
JPS5528547A (en) Magnetic recorder/reproducer
JPS56148751A (en) Automatic switching device of tape recorder
JPS5589919A (en) Information recorder
JPS56153528A (en) Detector for height of head in magnetic recorder and reproducer
JPS6489094A (en) Recording and reproducing device for magnetic tape identifying signal
JPS5417709A (en) Changeover circuit of tape recorder
SU145774A1 (en) Method of electric copying of magnetic sound tracks and recording of test tracks (test films)
JPS5736405A (en) Sound recorder
JPS55139613A (en) Tape recorder
JPS5654618A (en) Automatic gain control system
JPS5448514A (en) Cassette type rcorder-reproducer
JPS576447A (en) Controlling circuit of tape recorder
JPS56127961A (en) Signal level measuring device
JPS55146677A (en) Automatic regulating circuit for reproduced sound of automatic piano player
JPS5647944A (en) Magnetic tape feed controlling system
JPS5641504A (en) Information reproducing-recording device
JPS5591272A (en) Video signal reproducer
JPS5380210A (en) Magnetic tape device