BE845971A - DOUBLE FREQUENCY CODE DECODING PROCESS AND DEVICE FOR IMPLEMENTING THE PROCESS - Google Patents

DOUBLE FREQUENCY CODE DECODING PROCESS AND DEVICE FOR IMPLEMENTING THE PROCESS

Info

Publication number
BE845971A
BE845971A BE1007613A BE1007613A BE845971A BE 845971 A BE845971 A BE 845971A BE 1007613 A BE1007613 A BE 1007613A BE 1007613 A BE1007613 A BE 1007613A BE 845971 A BE845971 A BE 845971A
Authority
BE
Belgium
Prior art keywords
implementing
code decoding
double frequency
frequency code
decoding process
Prior art date
Application number
BE1007613A
Other languages
French (fr)
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 filed Critical
Publication of BE845971A publication Critical patent/BE845971A/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/01—Details
    • G06K7/016—Synchronisation of sensing process
    • 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
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1407—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol
    • G11B20/1419—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
BE1007613A 1975-09-24 1976-09-09 DOUBLE FREQUENCY CODE DECODING PROCESS AND DEVICE FOR IMPLEMENTING THE PROCESS BE845971A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7529259A FR2326082A1 (en) 1975-09-24 1975-09-24 Decoder for double frequency message coded magnetically - converts message into binary pulses using reference pulse generators and counters

Publications (1)

Publication Number Publication Date
BE845971A true BE845971A (en) 1977-03-09

Family

ID=9160385

Family Applications (1)

Application Number Title Priority Date Filing Date
BE1007613A BE845971A (en) 1975-09-24 1976-09-09 DOUBLE FREQUENCY CODE DECODING PROCESS AND DEVICE FOR IMPLEMENTING THE PROCESS

Country Status (7)

Country Link
BE (1) BE845971A (en)
DE (1) DE2642422A1 (en)
DK (1) DK429276A (en)
FR (1) FR2326082A1 (en)
IT (1) IT1072410B (en)
LU (1) LU75819A1 (en)
NL (1) NL7610590A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2506543B1 (en) * 1981-05-22 1986-12-05 Thomson Csf DEVICE FOR DECODING A CODE SIGNAL ON A SINGLE CHANNEL AND IN PARTICULAR OF VARIABLE SPEED AND / OR VARIABLE DENSITY READ INFORMATION

Also Published As

Publication number Publication date
DK429276A (en) 1977-03-25
FR2326082B1 (en) 1978-03-17
FR2326082A1 (en) 1977-04-22
LU75819A1 (en) 1977-05-13
IT1072410B (en) 1985-04-10
DE2642422A1 (en) 1977-03-31
NL7610590A (en) 1977-03-28

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