GB686706A - Improvements in or relating to recording reproducing apparatus - Google Patents

Improvements in or relating to recording reproducing apparatus

Info

Publication number
GB686706A
GB686706A GB1785050A GB1785050A GB686706A GB 686706 A GB686706 A GB 686706A GB 1785050 A GB1785050 A GB 1785050A GB 1785050 A GB1785050 A GB 1785050A GB 686706 A GB686706 A GB 686706A
Authority
GB
United Kingdom
Prior art keywords
reproducing apparatus
july
recording
variations
relating
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.)
Expired
Application number
GB1785050A
Inventor
Hector Gordon Merson Spratt
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Priority to GB1785050A priority Critical patent/GB686706A/en
Publication of GB686706A publication Critical patent/GB686706A/en
Expired 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/22—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing distortions

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

686,706. Magnetic recording and reproducing apparatus. MINNESOTA MINING & MANUFACTURING CO., Ltd., [formerly DUREX ABRASIVES, Ltd.], July 17, 1951 [July 17, 1950], No. 17850/50. Drawings to Specification. Class 40 (ii). A method of correcting fluctuations in audiofrequency output from a magnetic sound record, such as may be caused by variations in contact pressure between record and recording or reproducing heads, comprises utilizing the corresponding recorded variations of the ultrasonic bias signal, to apply a grid bias voltage, after suitable amplification and rectification, to a variable-mu valve in a pre-amplifier, whereby audio-frequency fluctuations are compensated.
GB1785050A 1950-07-17 1950-07-17 Improvements in or relating to recording reproducing apparatus Expired GB686706A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1785050A GB686706A (en) 1950-07-17 1950-07-17 Improvements in or relating to recording reproducing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1785050A GB686706A (en) 1950-07-17 1950-07-17 Improvements in or relating to recording reproducing apparatus

Publications (1)

Publication Number Publication Date
GB686706A true GB686706A (en) 1953-01-28

Family

ID=10102316

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1785050A Expired GB686706A (en) 1950-07-17 1950-07-17 Improvements in or relating to recording reproducing apparatus

Country Status (1)

Country Link
GB (1) GB686706A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5117856Y1 (en) * 1974-08-01 1976-05-13
JPS51135516U (en) * 1975-04-24 1976-11-01

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5117856Y1 (en) * 1974-08-01 1976-05-13
JPS51135516U (en) * 1975-04-24 1976-11-01

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