FR2248574A1 - System for recording numerical programme on magnetic tape - has counter determining period double that of introduction sign, with detection and verification - Google Patents

System for recording numerical programme on magnetic tape - has counter determining period double that of introduction sign, with detection and verification

Info

Publication number
FR2248574A1
FR2248574A1 FR7337499A FR7337499A FR2248574A1 FR 2248574 A1 FR2248574 A1 FR 2248574A1 FR 7337499 A FR7337499 A FR 7337499A FR 7337499 A FR7337499 A FR 7337499A FR 2248574 A1 FR2248574 A1 FR 2248574A1
Authority
FR
France
Prior art keywords
sign
introduction
magnetic tape
verification
detection
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.)
Granted
Application number
FR7337499A
Other languages
French (fr)
Other versions
FR2248574B1 (en
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.)
Etat Francais
Original Assignee
Etat Francais
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 Etat Francais filed Critical Etat Francais
Priority to FR7337499A priority Critical patent/FR2248574A1/en
Priority to NL7413576A priority patent/NL7413576A/en
Priority to IT2854174A priority patent/IT1022975B/en
Priority to GB4501874A priority patent/GB1490206A/en
Priority to CH1399874A priority patent/CH589341A5/xx
Priority to DE19742449715 priority patent/DE2449715A1/en
Publication of FR2248574A1 publication Critical patent/FR2248574A1/en
Application granted granted Critical
Publication of FR2248574B1 publication Critical patent/FR2248574B1/fr
Granted 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
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1803—Error detection or correction; Testing, e.g. of drop-outs by redundancy in data representation

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

The system records or reads back blocks 2 and 3 of numerical information on a magnetic tape in a cassette appearing as signs. Each sign has a certain number of bits, supplemented by a parity bit. Each sign is read twice is succession. An introduction sign is fed in at the top of the block twice in succession. Each sign is repeatedly decoded and they are selected as correct or faulty signs. The parity (6) and identity codes of the sign and repeated sign are verified bit by bit. A counter determines a period twice that of the introduction sign and used for searching. It is detected and produces a recognition signal. The repeating introduction sign is also detected and verified (25 and 26). The decoding and selection controls are synchronised.
FR7337499A 1973-10-19 1973-10-19 System for recording numerical programme on magnetic tape - has counter determining period double that of introduction sign, with detection and verification Granted FR2248574A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
FR7337499A FR2248574A1 (en) 1973-10-19 1973-10-19 System for recording numerical programme on magnetic tape - has counter determining period double that of introduction sign, with detection and verification
NL7413576A NL7413576A (en) 1973-10-19 1974-10-16 DEVICE WITH GREAT ACCURACY IN RECORDING OR DISPLAYING NUMERIC FORMATION ON CASSETTE MAGNETIC TAPE.
IT2854174A IT1022975B (en) 1973-10-19 1974-10-17 HIGH SECURITY SYSTEM FOR RECORDING OR RETURN OF DIGITAL INFORMATION ON MAGNETIC TAPE IN CASSETTE
GB4501874A GB1490206A (en) 1973-10-19 1974-10-17 High-reliability digital data read/write system for magnetic tape in cassettes
CH1399874A CH589341A5 (en) 1973-10-19 1974-10-18
DE19742449715 DE2449715A1 (en) 1973-10-19 1974-10-18 ARRANGEMENT FOR WRITING AND READING NUMERICAL INFORMATION BLOCKS ON OR FROM A CASSETTE MAGNETIC TAPE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7337499A FR2248574A1 (en) 1973-10-19 1973-10-19 System for recording numerical programme on magnetic tape - has counter determining period double that of introduction sign, with detection and verification

Publications (2)

Publication Number Publication Date
FR2248574A1 true FR2248574A1 (en) 1975-05-16
FR2248574B1 FR2248574B1 (en) 1978-07-13

Family

ID=9126710

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7337499A Granted FR2248574A1 (en) 1973-10-19 1973-10-19 System for recording numerical programme on magnetic tape - has counter determining period double that of introduction sign, with detection and verification

Country Status (1)

Country Link
FR (1) FR2248574A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2343382A1 (en) * 1976-03-04 1977-09-30 Post Office DATA PROCESSING DEVICE
FR2343380A1 (en) * 1976-03-04 1977-09-30 Post Office INFORMATION PROCESSING DEVICE
FR2375782A1 (en) * 1976-12-27 1978-07-21 Sony Corp METHOD AND DEVICE FOR ERROR REDUCTION IN AUDIO-FREQUENCY SIGNAL RECORDING

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2343382A1 (en) * 1976-03-04 1977-09-30 Post Office DATA PROCESSING DEVICE
FR2343380A1 (en) * 1976-03-04 1977-09-30 Post Office INFORMATION PROCESSING DEVICE
FR2375782A1 (en) * 1976-12-27 1978-07-21 Sony Corp METHOD AND DEVICE FOR ERROR REDUCTION IN AUDIO-FREQUENCY SIGNAL RECORDING

Also Published As

Publication number Publication date
FR2248574B1 (en) 1978-07-13

Similar Documents

Publication Publication Date Title
US4167028A (en) Method and an apparatus for time signal encoding/decoding
KR910008467B1 (en) Digital audio disk apparatus
GB1298250A (en) Apparatus for reproducing information from a record medium
US4053944A (en) Microprocessor controlled signal pattern detector
CA944076A (en) Method and device for reading and decoding a high density self-clocking bar code
EP0342803A3 (en) Method and apparatus for recording and reproducing picture information, and recording medium
GB1454081A (en) Digital data magnetic tape recording apparatus
US3235855A (en) Binary magnetic recording apparatus
KR850004153A (en) Optical recording media
KR890015246A (en) Digital audio signal player
ATE39777T1 (en) ARRANGEMENT FOR RECORDING DIGITAL SIGNALS.
GB1337163A (en) Dictating and transcribing apparatus
GB1123055A (en) Digital storage system
FR2248574A1 (en) System for recording numerical programme on magnetic tape - has counter determining period double that of introduction sign, with detection and verification
KR880002178A (en) Rotating head type recording and reproducing apparatus
KR870000648A (en) Data transmission and detection system
GB1313227A (en) Information storage devices
FR2295513A2 (en) System for recording numerical programme on magnetic tape - has counter determining period double that of introduction sign, with detection and verification
GB1294397A (en) Improvements in high density storage and retrieval system
GB1404541A (en) Information storage system
GB1364598A (en) Data record merging apparatus
US3715745A (en) Data input encoder
US3040306A (en) Contour data recording system
ES8200983A1 (en) Improved Error Coding for Video Disc System
FR2452149A1 (en) Selective reproduction system for audio or visual recording - has index code read from card supplied to search processor

Legal Events

Date Code Title Description
CL Concession to grant licenses
TP Transmission of property
ST Notification of lapse