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GB762699A - Improvements in or relating to magnetic reproducing apparatus - Google Patents

Improvements in or relating to magnetic reproducing apparatus

Info

Publication number
GB762699A
GB762699A GB12405/54A GB1240554A GB762699A GB 762699 A GB762699 A GB 762699A GB 12405/54 A GB12405/54 A GB 12405/54A GB 1240554 A GB1240554 A GB 1240554A GB 762699 A GB762699 A GB 762699A
Authority
GB
United Kingdom
Prior art keywords
track
reference frequency
frequency
reproducing apparatus
transducers
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
GB12405/54A
Inventor
Rolf Edmund Spencer
Roger Voles
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB12405/54A priority Critical patent/GB762699A/en
Publication of GB762699A publication Critical patent/GB762699A/en
Priority to GB4185/59A priority patent/GB838209A/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
    • G11B20/22—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing distortions
    • G11B20/225—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing distortions for reducing wow or flutter

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

762,699. Magnetic recording and reproducing apparatus. ELECTRIC & MUSICAL INDUSTRIES, Ltd. April 12, 1955 [April 29, 1954], No. 12405/54. Class 40 (2). In a magnetic recording and reproducing apparatus in which the phase difference between a recorded constant reference frequency and a recorded frequency of similar value varying in phase with the reference frequency in accordance with the signal, the effect of spurious phase shifts, such as would be caused by misalignment of the transducers, is reduced by duplicating either the track containing the reference frequency or the track carrying the modulated frequency, and arranging the duplicated track symmetrically about the other. Fig. 2 shows duplicated modulated tracks I arranged either side of a central reference frequency track R, while the converse is shown in Fig. 3. If during recording and reproducing there is an angular variation 6 from the normal relationship of the transducers to the record strip, phase shifts of opposite sign will occur in the outer transducers and will be cancelled out. The strip could carry more than one pair of signal tracks disposed symmetrically about a central reference track as shown in Fig. 4.
GB12405/54A 1954-04-29 1954-04-29 Improvements in or relating to magnetic reproducing apparatus Expired GB762699A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB12405/54A GB762699A (en) 1954-04-29 1954-04-29 Improvements in or relating to magnetic reproducing apparatus
GB4185/59A GB838209A (en) 1954-04-29 1959-02-06 Improvements in or relating to magnetic reproducing apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB12405/54A GB762699A (en) 1954-04-29 1954-04-29 Improvements in or relating to magnetic reproducing apparatus
GB4185/59A GB838209A (en) 1954-04-29 1959-02-06 Improvements in or relating to magnetic reproducing apparatus

Publications (1)

Publication Number Publication Date
GB762699A true GB762699A (en) 1956-12-05

Family

ID=62529338

Family Applications (2)

Application Number Title Priority Date Filing Date
GB12405/54A Expired GB762699A (en) 1954-04-29 1954-04-29 Improvements in or relating to magnetic reproducing apparatus
GB4185/59A Expired GB838209A (en) 1954-04-29 1959-02-06 Improvements in or relating to magnetic reproducing apparatus

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB4185/59A Expired GB838209A (en) 1954-04-29 1959-02-06 Improvements in or relating to magnetic reproducing apparatus

Country Status (1)

Country Link
GB (2) GB762699A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3051797A (en) * 1959-03-09 1962-08-28 Minnesota Mining & Mfg Transducing system
US3174090A (en) * 1959-04-27 1965-03-16 Rca Corp Phase responsive motor speed control system
US3187092A (en) * 1959-04-27 1965-06-01 Rca Corp Speed control system using parallel control loops
US3204228A (en) * 1955-11-16 1965-08-31 Sperry Rand Corp Signal synchronizer
US3263031A (en) * 1962-05-29 1966-07-26 Sperry Rand Corp High-low frequency homing
DE2823928A1 (en) * 1977-06-01 1978-12-07 Matsushita Electric Ind Co Ltd METHOD AND DEVICE FOR RECORDING AND REPLAYING BIT GROUPS ON A MAGNETIC TAPE

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3204228A (en) * 1955-11-16 1965-08-31 Sperry Rand Corp Signal synchronizer
US3051797A (en) * 1959-03-09 1962-08-28 Minnesota Mining & Mfg Transducing system
US3174090A (en) * 1959-04-27 1965-03-16 Rca Corp Phase responsive motor speed control system
US3187092A (en) * 1959-04-27 1965-06-01 Rca Corp Speed control system using parallel control loops
US3263031A (en) * 1962-05-29 1966-07-26 Sperry Rand Corp High-low frequency homing
DE2823928A1 (en) * 1977-06-01 1978-12-07 Matsushita Electric Ind Co Ltd METHOD AND DEVICE FOR RECORDING AND REPLAYING BIT GROUPS ON A MAGNETIC TAPE
US4302783A (en) * 1977-06-01 1981-11-24 Soichiro Mima Method and apparatus for recording and reproducing a plurality of bits on a magnetic tape

Also Published As

Publication number Publication date
GB838209A (en) 1960-06-22

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