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ES460639A1 - Methods of and apparatus for encoding and recovering binary digital signals - Google Patents

Methods of and apparatus for encoding and recovering binary digital signals

Info

Publication number
ES460639A1
ES460639A1 ES460639A ES460639A ES460639A1 ES 460639 A1 ES460639 A1 ES 460639A1 ES 460639 A ES460639 A ES 460639A ES 460639 A ES460639 A ES 460639A ES 460639 A1 ES460639 A1 ES 460639A1
Authority
ES
Spain
Prior art keywords
signal
word
data
point
minimum distance
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.)
Expired
Application number
ES460639A
Other languages
Spanish (es)
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.)
Unisys Corp
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 ES460639A1 publication Critical patent/ES460639A1/en
Expired 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
    • G11B20/14—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)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Dc Digital Transmission (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).
ES460639A 1976-07-14 1977-07-11 Methods of and apparatus for encoding and recovering binary digital signals Expired ES460639A1 (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
ES460639A1 true ES460639A1 (en) 1978-12-01

Family

ID=24832463

Family Applications (1)

Application Number Title Priority Date Filing Date
ES460639A Expired ES460639A1 (en) 1976-07-14 1977-07-11 Methods of and apparatus for encoding and recovering binary digital signals

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
WO1982000912A1 (en) * 1980-09-05 1982-03-18 Furukawa T System for coding and decoding 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
JP2545817B2 (en) * 1986-12-27 1996-10-23 ソニー株式会社 Digital pulse modulation circuit
JP2615588B2 (en) * 1987-02-17 1997-05-28 ソニー株式会社 Digital pulse demodulation 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
SE7708112L (en) 1978-01-15
NL7707702A (en) 1978-01-17
JPS5311011A (en) 1978-02-01
DE2731516A1 (en) 1978-02-23
CH629347A5 (en) 1982-04-15
FR2358786B1 (en) 1982-10-29
CA1122711A (en) 1982-04-27
DE2731516C2 (en) 1984-12-06
SE428255B (en) 1983-06-13
IT1083796B (en) 1985-05-25
GB1590404A (en) 1981-06-03
JPS6214909B2 (en) 1987-04-04
FR2358786A1 (en) 1978-02-10

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