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 methodInfo
- 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
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0162071A1 (en) * | 1983-11-21 | 1985-11-27 | Haute Securite Video Hsv S.A. | Antipiracy device and method for cinematographic and video carriers |
WO1986000745A1 (en) * | 1984-07-16 | 1986-01-30 | Mcwhirter Holdings Pty. Limited | Recorded information verification system |
US4706293A (en) * | 1984-08-10 | 1987-11-10 | Minnesota Mining And Manufacturing Company | Circuitry for characterizing speech for tamper protected recording |
EP0215023B1 (en) * | 1985-03-18 | 1990-12-05 | McWHIRTER HOLDINGS PTY LIMITED | Magnetic tape cassette having a prerecorded low frequency tone |
US4706282A (en) * | 1985-12-23 | 1987-11-10 | Minnesota Mining And Manufacturing Company | Decoder for a recorder-decoder system |
-
1976
- 1976-09-02 CH CH1111876A patent/CH610135A5/en not_active IP Right Cessation
-
1977
- 1977-02-08 DE DE19772705182 patent/DE2705182A1/en not_active Withdrawn
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 |