GB624638A - Improvements in or relating to magnetic recording - Google Patents

Improvements in or relating to magnetic recording

Info

Publication number
GB624638A
GB624638A GB3223446A GB3223446A GB624638A GB 624638 A GB624638 A GB 624638A GB 3223446 A GB3223446 A GB 3223446A GB 3223446 A GB3223446 A GB 3223446A GB 624638 A GB624638 A GB 624638A
Authority
GB
United Kingdom
Prior art keywords
frequency
medium
carrier
recording
magnetic
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
GB3223446A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB3223446A priority Critical patent/GB624638A/en
Publication of GB624638A publication Critical patent/GB624638A/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
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/02—Analogue recording or reproducing
    • G11B20/06—Angle-modulation recording or reproducing

Landscapes

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

Abstract

624,638. Magnetic recording. STANDARD TELEPHONES & CABLES, Ltd., STARR, A. T., and MOODY, N. F. Oct. 30, 1946, No. 32234. Drawings to Specification. [Class 40 (ii)] In a recording apparatus employing a magnetic medium, high-frequency attenuation and other defects caused by variation in the magnetic properties of the medium are avoided by recording a carrier wave of 15 to 20 kcs/sec. modulated by the desired intelligence. In a preferred embodiment, frequency modulation is used, in which case amplitude attenuation or any similar form of distortion is immaterial, as the modulation amplitudes are represented by time differences between carrier cycles. It is found desirable to make the carrier waveform as near square as possible. This may be obtained by making the high positive and low negative parts near or past the saturation value of the medium, or by the use of a suitable carrier-frequency oscillator. Reproduction is effected by demodulating by means of a conventional integrator, amplifier and limiter, followed by a low-pass filter, frequency discriminator and detector.
GB3223446A 1946-10-30 1946-10-30 Improvements in or relating to magnetic recording Expired GB624638A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3223446A GB624638A (en) 1946-10-30 1946-10-30 Improvements in or relating to magnetic recording

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3223446A GB624638A (en) 1946-10-30 1946-10-30 Improvements in or relating to magnetic recording

Publications (1)

Publication Number Publication Date
GB624638A true GB624638A (en) 1949-06-14

Family

ID=10335406

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3223446A Expired GB624638A (en) 1946-10-30 1946-10-30 Improvements in or relating to magnetic recording

Country Status (1)

Country Link
GB (1) GB624638A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2697755A (en) * 1950-10-31 1954-12-21 Rca Corp Magnetic record system
US3513266A (en) * 1967-02-27 1970-05-19 Ibm Magnetic recording system for wideband signal multiplexing by frequency modulation
US3852813A (en) * 1970-06-08 1974-12-03 Polaroid Corp Method and circuit for recording audio signals on magnetic tape
GB2335068A (en) * 1998-03-07 1999-09-08 Martin John Brennan Bias signals

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2697755A (en) * 1950-10-31 1954-12-21 Rca Corp Magnetic record system
US3513266A (en) * 1967-02-27 1970-05-19 Ibm Magnetic recording system for wideband signal multiplexing by frequency modulation
US3852813A (en) * 1970-06-08 1974-12-03 Polaroid Corp Method and circuit for recording audio signals on magnetic tape
GB2335068A (en) * 1998-03-07 1999-09-08 Martin John Brennan Bias signals

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