FR2413741A1 - IMPROVEMENTS RELATED TO ANALOGUE RECORDING ON MAGNETIC MEDIA - Google Patents

IMPROVEMENTS RELATED TO ANALOGUE RECORDING ON MAGNETIC MEDIA

Info

Publication number
FR2413741A1
FR2413741A1 FR7836151A FR7836151A FR2413741A1 FR 2413741 A1 FR2413741 A1 FR 2413741A1 FR 7836151 A FR7836151 A FR 7836151A FR 7836151 A FR7836151 A FR 7836151A FR 2413741 A1 FR2413741 A1 FR 2413741A1
Authority
FR
France
Prior art keywords
polarization
recording
analogue
signal
generator
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.)
Withdrawn
Application number
FR7836151A
Other languages
French (fr)
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.)
Dolby Laboratories Licensing Corp
Original Assignee
Dolby Laboratories Licensing Corp
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 Dolby Laboratories Licensing Corp filed Critical Dolby Laboratories Licensing Corp
Publication of FR2413741A1 publication Critical patent/FR2413741A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
    • H03G9/025—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers frequency-dependent volume compression or expansion, e.g. multiple-band systems
    • 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
    • G11B5/027—Analogue recording
    • G11B5/03—Biasing

Landscapes

  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

APPAREIL POUR ENREGISTRER DES INFORMATIONS ANALOGIQUES SUR UN SUPPORT MAGNETIQUE. L'APPAREIL COMPORTE UN AMPLIFICATEUR D'ENREGISTREMENT 1 A L'ENTREE DUQUEL EST APPLIQUE LE SIGNAL ANALOGIQUE, UN GENERATEUR 3 DE SIGNAL DE POLARISATION D'ENREGISTREMENT ET UN SOMMATEUR 4 QUI APPLIQUE LA SOMME DU SIGNAL ANALOGIQUE ET DU SIGNAL DE POLARISATION A UNE TETE D'ENREGISTREMENT 5. UN GENERATEUR 6 D'INFORMATION DE COMMANDE AGIT SUR LE GENERATEUR DE POLARISATION 3 ET, EVENTUELLEMENT, SUR LA COMMANDE DE GAIN ET D'EGALISATION 2 DE L'AMPLIFICATEUR POUR MODIFIER DYNAMIQUEMENT LA POLARISATION EN FONCTION DE L'AMPLITUDE DANS UN SPECTRE DE FREQUENCES PREDETERMINE DU SIGNAL ANALOGIQUE ET POUR MAINTENIR LA REPONSE D'ENREGISTREMENTREPRODUCTION RELATIVEMENT INVARIABLE VIS-A-VIS DU CHANGEMENT DU NIVEAU DE POLARISATION. APPLICATION AUX ENREGISTREURS AUDIO.APPARATUS FOR RECORDING ANALOGUE INFORMATION ON A MAGNETIC MEDIA. THE APPARATUS INCLUDES A RECORDING AMPLIFIER 1 TO THE INPUT TO WHICH THE ANALOGUE SIGNAL IS APPLIED, A RECORDING POLARIZATION SIGNAL GENERATOR 3 AND A SUMMER 4 WHICH APPLIES THE SUM OF THE ANALOGUE SIGNAL AND THE POLARIZATION SIGNAL TO A HEAD RECORD 5. A CONTROL INFORMATION GENERATOR 6 ACTS ON POLARIZATION GENERATOR 3 AND, OPTIONALLY, ON AMPLIFIER GAIN AND EQUALIZATION CONTROL 2 TO DYNAMICALLY MODIFY THE POLARIZATION ACCORDING TO THE AMPLITUDE IN A PREDETERMINED FREQUENCY SPECTRUM OF THE ANALOGUE SIGNAL AND TO MAINTAIN THE REGISTRATIONREPRODUCTION RESPONSE RELATIVELY INVARIABLE TO THE CHANGE OF THE POLARIZATION LEVEL. APPLICATION TO AUDIO RECORDERS.

FR7836151A 1977-12-27 1978-12-22 IMPROVEMENTS RELATED TO ANALOGUE RECORDING ON MAGNETIC MEDIA Withdrawn FR2413741A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US86454177A 1977-12-27 1977-12-27
US96868478A 1978-12-12 1978-12-12

Publications (1)

Publication Number Publication Date
FR2413741A1 true FR2413741A1 (en) 1979-07-27

Family

ID=27127845

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7836151A Withdrawn FR2413741A1 (en) 1977-12-27 1978-12-22 IMPROVEMENTS RELATED TO ANALOGUE RECORDING ON MAGNETIC MEDIA

Country Status (9)

Country Link
JP (1) JPS54106215A (en)
AT (1) AT370901B (en)
CA (1) CA1122702A (en)
DE (1) DE2855259A1 (en)
DK (1) DK583278A (en)
FR (1) FR2413741A1 (en)
GB (1) GB2013958B (en)
NL (1) NL7812490A (en)
SE (1) SE7813317L (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2464530A1 (en) * 1979-07-13 1981-03-06 Dolby Lab Licensing Corp IMPROVEMENTS IN ANALOGUE RECORDING ON MAGNETIC SUBSTRATES

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4314289A (en) * 1979-12-07 1982-02-02 International Business Machines Corporation Biased pulsed recording systems and methods
EP0046410B1 (en) * 1980-08-20 1984-10-31 Bang & Olufsen A/S Bias control method and apparatus for magnetic recording

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2628287A (en) * 1951-02-16 1953-02-10 Nathan M Haynes Magnetic recording apparatus
DE1064732B (en) * 1957-10-22 1959-09-03 Loewe Opta Ag Circuit arrangement for recording sound vibrations with frequency-dependent high-frequency premagnetization on tape-shaped magnetogram carriers
DE1099199B (en) * 1958-03-25 1961-02-09 Loewe Opta Ag Circuit arrangement for controlling the amplitude of a high-frequency premagnetization for magnetic tape recording
FR2055373A5 (en) * 1969-07-21 1971-05-07 Dolby Laboratories Inc
US3798673A (en) * 1970-12-19 1974-03-19 Victor Co Ltd Ac bias control recording system and apparatus in a magnetic recording apparatus
US4011585A (en) * 1974-07-12 1977-03-08 Pioneer Electronic Corporation Magnetic recording reproducing system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5230440U (en) * 1975-08-22 1977-03-03

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2628287A (en) * 1951-02-16 1953-02-10 Nathan M Haynes Magnetic recording apparatus
DE1064732B (en) * 1957-10-22 1959-09-03 Loewe Opta Ag Circuit arrangement for recording sound vibrations with frequency-dependent high-frequency premagnetization on tape-shaped magnetogram carriers
DE1099199B (en) * 1958-03-25 1961-02-09 Loewe Opta Ag Circuit arrangement for controlling the amplitude of a high-frequency premagnetization for magnetic tape recording
FR2055373A5 (en) * 1969-07-21 1971-05-07 Dolby Laboratories Inc
US3798673A (en) * 1970-12-19 1974-03-19 Victor Co Ltd Ac bias control recording system and apparatus in a magnetic recording apparatus
US4011585A (en) * 1974-07-12 1977-03-08 Pioneer Electronic Corporation Magnetic recording reproducing system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2464530A1 (en) * 1979-07-13 1981-03-06 Dolby Lab Licensing Corp IMPROVEMENTS IN ANALOGUE RECORDING ON MAGNETIC SUBSTRATES

Also Published As

Publication number Publication date
AT370901B (en) 1983-05-10
JPS54106215A (en) 1979-08-21
GB2013958B (en) 1982-05-06
GB2013958A (en) 1979-08-15
NL7812490A (en) 1979-06-29
ATA930178A (en) 1982-09-15
DK583278A (en) 1979-06-28
SE7813317L (en) 1979-06-28
DE2855259A1 (en) 1979-07-05
CA1122702A (en) 1982-04-27

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Legal Events

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