CH610135A5 - Method of recording on a magnetic medium and magnetic medium recorded according to this method - Google Patents

Method of recording on a magnetic medium and magnetic medium recorded according to this method

Info

Publication number
CH610135A5
CH610135A5 CH1111876A CH1111876A CH610135A5 CH 610135 A5 CH610135 A5 CH 610135A5 CH 1111876 A CH1111876 A CH 1111876A CH 1111876 A CH1111876 A CH 1111876A CH 610135 A5 CH610135 A5 CH 610135A5
Authority
CH
Switzerland
Prior art keywords
magnetic medium
recording
recorded according
control information
messages
Prior art date
Application number
CH1111876A
Inventor
A Renonce A Etre Mentionne Inventeur
Original Assignee
Patek Philippe
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 Patek Philippe filed Critical Patek Philippe
Priority to CH1111876A priority Critical patent/CH610135A5/en
Priority to DE19772705182 priority patent/DE2705182A1/en
Publication of CH610135A5 publication Critical patent/CH610135A5/en

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
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
    • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
    • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
    • G11B27/3036—Time code signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

This method consists in recording on the same track of a magnetic medium alternately plain messages and coded control information. The recording of the messages is interrupted at regular intervals over 10 to 50 milliseconds in order to record an item of coded control information during this time lapse. This method makes it impossible to fake a recorded tape.
CH1111876A 1976-09-02 1976-09-02 Method of recording on a magnetic medium and magnetic medium recorded according to this method CH610135A5 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CH1111876A CH610135A5 (en) 1976-09-02 1976-09-02 Method of recording on a magnetic medium and magnetic medium recorded according to this method
DE19772705182 DE2705182A1 (en) 1976-09-02 1977-02-08 Magnetic sound carrier recording and read-out system - has information in clear and control code recorded on same sound carrier track

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1111876A CH610135A5 (en) 1976-09-02 1976-09-02 Method of recording on a magnetic medium and magnetic medium recorded according to this method

Publications (1)

Publication Number Publication Date
CH610135A5 true CH610135A5 (en) 1979-03-30

Family

ID=4370262

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1111876A CH610135A5 (en) 1976-09-02 1976-09-02 Method of recording on a magnetic medium and magnetic medium recorded according to this method

Country Status (2)

Country Link
CH (1) CH610135A5 (en)
DE (1) DE2705182A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985002293A1 (en) * 1983-11-21 1985-05-23 Haute Securite Video Hsv S.A. Antipiracy device and method for cinematographic and video carriers
DE3583737D1 (en) * 1984-07-16 1991-09-12 Mcwhirter Holdings Pty Ltd CONTROL SYSTEM FOR RECORDED INFORMATION.
US4706293A (en) * 1984-08-10 1987-11-10 Minnesota Mining And Manufacturing Company Circuitry for characterizing speech for tamper protected recording
AU582216B2 (en) * 1985-03-18 1989-03-16 Minnesota Mining And Manufacturing Company Method of ensuring authenticity of recorded information
US4706282A (en) * 1985-12-23 1987-11-10 Minnesota Mining And Manufacturing Company Decoder for a recorder-decoder system

Also Published As

Publication number Publication date
DE2705182A1 (en) 1978-03-09

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Legal Events

Date Code Title Description
PL Patent ceased