SE7708112L - PROCEDURE AND DEVICE FOR CODING BINERA DATA - Google Patents

PROCEDURE AND DEVICE FOR CODING BINERA DATA

Info

Publication number
SE7708112L
SE7708112L SE7708112A SE7708112A SE7708112L SE 7708112 L SE7708112 L SE 7708112L SE 7708112 A SE7708112 A SE 7708112A SE 7708112 A SE7708112 A SE 7708112A SE 7708112 L SE7708112 L SE 7708112L
Authority
SE
Sweden
Prior art keywords
signal
word
data
point
minimum distance
Prior art date
Application number
SE7708112A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE428255B (en
Inventor
G V Jacoby
Original Assignee
Sperry Rand 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 Sperry Rand Corp filed Critical Sperry Rand Corp
Publication of SE7708112L publication Critical patent/SE7708112L/en
Publication of SE428255B publication Critical patent/SE428255B/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
    • G11B20/10—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
    • G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
    • G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
    • 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
    • G11B20/10009—Improvement or modification of read or write signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Dc Digital Transmission (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

In this method, which can be used, in particular, in transmission systems and in magnetic storage and recovery systems for digital data, for example three bits in each case (three time intervals T) of a binary data signal are combined to form one word. This word corresponds to data cells of the transmission or recording signal. A data cell (Z) exhibits six possible points of signal change (P1 to P6). The binary data signal is converted into a transmission or recording signal in such a manner that a minimum distance (3/2 T) and a maximum distance (6 T) is always ensured so that self-clocking is possible during the reading. Since it is not sufficient only to pay attention to the signal changes within one data cell (Z) but care must also be taken that two signal changes (P5 and P1) of adjacent data cells (e.g. Z4 and Z5) are not closer together than the required minimum distance (3/2 T), the present word is in each case compared with the preceding and following word. If it is found for a word, that a signal change should take place at a point (P5) which is not the minimum distance (3/2 T) away from the point at which a signal change (P1) for another word should take place, the two signal changes are combined at one point (P6). For this purpose, the device for carrying out the method has a coding device with three coders (17, 24, 29) for the present, preceding and following word and switching means (33) which provide a signal change at the boundary (P6) between the data cells (Z4, Z5) instead of the two prevented signal changes (P1, P5). <IMAGE>
SE7708112A 1976-07-14 1977-07-12 DEVICE INTENDED TO CONVERT A BINER DATA SIGNAL TO AN OUTPUT THAT EXPRESSES AN EXTENDED MINIMUM SPACE AND A PRESCRIBED MAXIMUM SPACE BETWEEN EXISTING SIGNAL CHANGES SE428255B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US70519976A 1976-07-14 1976-07-14

Publications (2)

Publication Number Publication Date
SE7708112L true SE7708112L (en) 1978-01-15
SE428255B SE428255B (en) 1983-06-13

Family

ID=24832463

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7708112A SE428255B (en) 1976-07-14 1977-07-12 DEVICE INTENDED TO CONVERT A BINER DATA SIGNAL TO AN OUTPUT THAT EXPRESSES AN EXTENDED MINIMUM SPACE AND A PRESCRIBED MAXIMUM SPACE BETWEEN EXISTING SIGNAL CHANGES

Country Status (10)

Country Link
JP (1) JPS5311011A (en)
CA (1) CA1122711A (en)
CH (1) CH629347A5 (en)
DE (1) DE2731516C2 (en)
ES (1) ES460639A1 (en)
FR (1) FR2358786A1 (en)
GB (1) GB1590404A (en)
IT (1) IT1083796B (en)
NL (1) NL7707702A (en)
SE (1) SE428255B (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55138950A (en) * 1979-04-17 1980-10-30 Mitsubishi Electric Corp Digital signal modulation and demodulation system
JPS55141852A (en) * 1979-04-24 1980-11-06 Sony Corp Data converting system
FR2466913A1 (en) * 1979-10-01 1981-04-10 Thomson Csf METHOD AND DEVICE FOR ENCODING BINARY DATA, DEVICES FOR DECODING ENCODED DATA, AND TRANSMISSION SYSTEMS HAVING SUCH DEVICES
US4496934A (en) * 1980-09-05 1985-01-29 Mitsubishi Denki Kabushiki Kaisha Encoding and decoding systems for binary data
US4544962A (en) * 1981-07-06 1985-10-01 Matsushita Electric Industrial Co., Ltd. Method and apparatus for processing binary data
JPS5864608A (en) * 1981-10-15 1983-04-18 Victor Co Of Japan Ltd Recording and reproducing system for digital signal
NL8203575A (en) * 1982-09-15 1984-04-02 Philips Nv METHOD FOR CODING A STREAM OF DATA BITS, DEVICE FOR CARRYING OUT THE METHOD AND DEVICE FOR DECODING A STREAM DATA BITS.
US4802154A (en) * 1983-10-13 1989-01-31 Laser Magnetic Storage International Company High density codes for optical recording
DE3416547C2 (en) * 1983-10-13 1994-10-06 Philips Nv Record carriers with symbols with a predetermined number of symbol positions and optical recording device
JP2615588B2 (en) * 1987-02-17 1997-05-28 ソニー株式会社 Digital pulse demodulation circuit
JP2545817B2 (en) * 1986-12-27 1996-10-23 ソニー株式会社 Digital pulse modulation circuit
JP2014179964A (en) * 2013-04-16 2014-09-25 Ishida Co Ltd Encoder

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3482228A (en) * 1965-10-21 1969-12-02 Sperry Rand Corp Write circuit for a phase modulation system

Also Published As

Publication number Publication date
IT1083796B (en) 1985-05-25
ES460639A1 (en) 1978-12-01
JPS6214909B2 (en) 1987-04-04
FR2358786A1 (en) 1978-02-10
JPS5311011A (en) 1978-02-01
FR2358786B1 (en) 1982-10-29
CA1122711A (en) 1982-04-27
NL7707702A (en) 1978-01-17
SE428255B (en) 1983-06-13
DE2731516A1 (en) 1978-02-23
GB1590404A (en) 1981-06-03
CH629347A5 (en) 1982-04-15
DE2731516C2 (en) 1984-12-06

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